package org.postgresql.jdbc2;

// IMPORTANT NOTE: This file implements the JDBC 2 version of the driver.
// If you make any modifications to this file, you must make sure that the
// changes are also made (if relevent) to the related JDBC 1 class in the
// org.postgresql.jdbc1 package.

import java.sql.*;
import java.util.*;

import org.postgresql.Driver;
import org.postgresql.Field;
import org.postgresql.util.PSQLException;

/*
 * This class provides information about the database as a whole.
 *
 * $Id: DatabaseMetaData.java,v 1.48 2002/01/18 17:21:31 davec Exp $
 *
 * <p>Many of the methods here return lists of information in ResultSets.  You
 * can use the normal ResultSet methods such as getString and getInt to
 * retrieve the data from these ResultSets.  If a given form of metadata is
 * not available, these methods should throw a SQLException.
 *
 * <p>Some of these methods take arguments that are String patterns.  These
 * arguments all have names such as fooPattern.  Within a pattern String,
 * "%" means match any substring of 0 or more characters, and "_" means
 * match any one character.  Only metadata entries matching the search
 * pattern are returned.  if a search pattern argument is set to a null
 * ref, it means that argument's criteria should be dropped from the
 * search.
 *
 * <p>A SQLException will be throws if a driver does not support a meta
 * data method.  In the case of methods that return a ResultSet, either
 * a ResultSet (which may be empty) is returned or a SQLException is
 * thrown.
 *
 * @see java.sql.DatabaseMetaData
 */
public class DatabaseMetaData implements java.sql.DatabaseMetaData
{
	Connection connection;		// The connection association

	// These define various OID's. Hopefully they will stay constant.
	static final int iVarcharOid = 1043;	// OID for varchar
	static final int iBoolOid = 16; // OID for bool
	static final int iInt2Oid = 21; // OID for int2
	static final int iInt4Oid = 23; // OID for int4
	static final int VARHDRSZ = 4;	// length for int4

	public DatabaseMetaData(Connection conn)
	{
		this.connection = conn;
	}

	/*
	 * Can all the procedures returned by getProcedures be called
	 * by the current user?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean allProceduresAreCallable() throws SQLException
	{
		Driver.debug("allProceduresAreCallable");
		return true;		// For now...
	}

	/*
	 * Can all the tables returned by getTable be SELECTed by
	 * the current user?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean allTablesAreSelectable() throws SQLException
	{
		Driver.debug("allTablesAreSelectable");
		return true;		// For now...
	}

	/*
	 * What is the URL for this database?
	 *
	 * @return the url or null if it cannott be generated
	 * @exception SQLException if a database access error occurs
	 */
	public String getURL() throws SQLException
	{
		String url = connection.getURL();
		Driver.debug("getURL " + url);
		return url;
	}

	/*
	 * What is our user name as known to the database?
	 *
	 * @return our database user name
	 * @exception SQLException if a database access error occurs
	 */
	public String getUserName() throws SQLException
	{
		String userName = connection.getUserName();
		Driver.debug("getUserName " + userName);
		return userName;
	}

	/*
	 * Is the database in read-only mode?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean isReadOnly() throws SQLException
	{
		boolean isReadOnly = connection.isReadOnly();
		Driver.debug("isReadOnly " + isReadOnly);
		return isReadOnly;
	}

	/*
	 * Are NULL values sorted high?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean nullsAreSortedHigh() throws SQLException
	{
		boolean nullSortedHigh = connection.haveMinimumServerVersion("7.2");
		Driver.debug("nullsAreSortedHigh " + nullSortedHigh);
		return nullSortedHigh;
	}

	/*
	 * Are NULL values sorted low?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean nullsAreSortedLow() throws SQLException
	{
		Driver.debug("nullsAreSortedLow false");
		return false;
	}

	/*
	 * Are NULL values sorted at the start regardless of sort order?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean nullsAreSortedAtStart() throws SQLException
	{
		Driver.debug("nullsAreSortedAtStart false");
		return false;
	}

	/*
	 * Are NULL values sorted at the end regardless of sort order?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean nullsAreSortedAtEnd() throws SQLException
	{
		boolean nullsAreSortedAtEnd = ! connection.haveMinimumServerVersion("7.2");
		Driver.debug("nullsAreSortedAtEnd " + nullsAreSortedAtEnd);
		return nullsAreSortedAtEnd;
	}

	/*
	 * What is the name of this database product - we hope that it is
	 * PostgreSQL, so we return that explicitly.
	 *
	 * @return the database product name
	 * @exception SQLException if a database access error occurs
	 */
	public String getDatabaseProductName() throws SQLException
	{
		Driver.debug("getDatabaseProductName PostgresSQL");
		return "PostgreSQL";
	}

	/*
	 * What is the version of this database product.
	 *
	 * @return the database version
	 * @exception SQLException if a database access error occurs
	 */
	public String getDatabaseProductVersion() throws SQLException
	{
		String versionNumber = connection.getDBVersionNumber();
		Driver.debug("getDatabaseProductVersion " + versionNumber);
		return versionNumber;
	}

	/*
	 * What is the name of this JDBC driver?  If we don't know this
	 * we are doing something wrong!
	 *
	 * @return the JDBC driver name
	 * @exception SQLException why?
	 */
	public String getDriverName() throws SQLException
	{
		String driverName = "PostgreSQL Native Driver";
		Driver.debug("getDriverName" + driverName);
		return driverName;
	}

	/*
	 * What is the version string of this JDBC driver?	Again, this is
	 * static.
	 *
	 * @return the JDBC driver name.
	 * @exception SQLException why?
	 */
	public String getDriverVersion() throws SQLException
	{
		String driverVersion = connection.this_driver.getVersion();
		Driver.debug("getDriverVersion " + driverVersion);
		return driverVersion;
	}

	/*
	 * What is this JDBC driver's major version number?
	 *
	 * @return the JDBC driver major version
	 */
	public int getDriverMajorVersion()
	{
		int majorVersion = connection.this_driver.getMajorVersion();
		Driver.debug("getMajorVersion " + majorVersion);
		return majorVersion;
	}

	/*
	 * What is this JDBC driver's minor version number?
	 *
	 * @return the JDBC driver minor version
	 */
	public int getDriverMinorVersion()
	{
		int minorVersion = connection.this_driver.getMinorVersion();
		Driver.debug("getMinorVersion " + minorVersion);
		return minorVersion;
	}

	/*
	 * Does the database store tables in a local file?	No - it
	 * stores them in a file on the server.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean usesLocalFiles() throws SQLException
	{
		Driver.debug("usesLocalFiles " + false);
		return false;
	}

	/*
	 * Does the database use a file for each table?  Well, not really,
	 * since it doesnt use local files.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean usesLocalFilePerTable() throws SQLException
	{
		Driver.debug("usesLocalFilePerTable " + false);
		return false;
	}

	/*
	 * Does the database treat mixed case unquoted SQL identifiers
	 * as case sensitive and as a result store them in mixed case?
	 * A JDBC-Compliant driver will always return false.
	 *
	 * <p>Predicament - what do they mean by "SQL identifiers" - if it
	 * means the names of the tables and columns, then the answers
	 * given below are correct - otherwise I don't know.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsMixedCaseIdentifiers() throws SQLException
	{
		Driver.debug("supportsMixedCaseIdentifiers " + false);
		return false;
	}

	/*
	 * Does the database treat mixed case unquoted SQL identifiers as
	 * case insensitive and store them in upper case?
	 *
	 * @return true if so
	 */
	public boolean storesUpperCaseIdentifiers() throws SQLException
	{
		Driver.debug("storesUpperCaseIdentifiers " + false);
		return false;
	}

	/*
	 * Does the database treat mixed case unquoted SQL identifiers as
	 * case insensitive and store them in lower case?
	 *
	 * @return true if so
	 */
	public boolean storesLowerCaseIdentifiers() throws SQLException
	{
		Driver.debug("storesLowerCaseIdentifiers " + true);
		return true;
	}

	/*
	 * Does the database treat mixed case unquoted SQL identifiers as
	 * case insensitive and store them in mixed case?
	 *
	 * @return true if so
	 */
	public boolean storesMixedCaseIdentifiers() throws SQLException
	{
		Driver.debug("storesMixedCaseIdentifiers " + false);
		return false;
	}

	/*
	 * Does the database treat mixed case quoted SQL identifiers as
	 * case sensitive and as a result store them in mixed case?  A
	 * JDBC compliant driver will always return true.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsMixedCaseQuotedIdentifiers() throws SQLException
	{
		Driver.debug("supportsMixedCaseQuotedIdentifiers " + true);
		return true;
	}

	/*
	 * Does the database treat mixed case quoted SQL identifiers as
	 * case insensitive and store them in upper case?
	 *
	 * @return true if so
	 */
	public boolean storesUpperCaseQuotedIdentifiers() throws SQLException
	{
		Driver.debug("storesUpperCaseQuotedIdentifiers " + false);
		return false;
	}

	/*
	 * Does the database treat mixed case quoted SQL identifiers as case
	 * insensitive and store them in lower case?
	 *
	 * @return true if so
	 */
	public boolean storesLowerCaseQuotedIdentifiers() throws SQLException
	{
		Driver.debug("storesLowerCaseQuotedIdentifiers " + false);
		return false;
	}

	/*
	 * Does the database treat mixed case quoted SQL identifiers as case
	 * insensitive and store them in mixed case?
	 *
	 * @return true if so
	 */
	public boolean storesMixedCaseQuotedIdentifiers() throws SQLException
	{
		Driver.debug("storesMixedCaseQuotedIdentifiers " + false);
		return false;
	}

	/*
	 * What is the string used to quote SQL identifiers?  This returns
	 * a space if identifier quoting isn't supported.  A JDBC Compliant
	 * driver will always use a double quote character.
	 *
	 * @return the quoting string
	 * @exception SQLException if a database access error occurs
	 */
	public String getIdentifierQuoteString() throws SQLException
	{
		Driver.debug("getIdentifierQuoteString \"" );
		return "\"";
	}

	/*
	 * Get a comma separated list of all a database's SQL keywords that
	 * are NOT also SQL92 keywords.
	 *
	 * <p>Within PostgreSQL, the keywords are found in
	 *	src/backend/parser/keywords.c
	 *
	 * <p>For SQL Keywords, I took the list provided at
	 *	<a href="http://web.dementia.org/~shadow/sql/sql3bnf.sep93.txt">
	 * http://web.dementia.org/~shadow/sql/sql3bnf.sep93.txt</a>
	 * which is for SQL3, not SQL-92, but it is close enough for
	 * this purpose.
	 *
	 * @return a comma separated list of keywords we use
	 * @exception SQLException if a database access error occurs
	 */
	public String getSQLKeywords() throws SQLException
	{
		Driver.debug("getSQLKeyWords");
		return "abort,acl,add,aggregate,append,archive,arch_store,backward,binary,change,cluster,copy,database,delimiters,do,extend,explain,forward,heavy,index,inherits,isnull,light,listen,load,merge,nothing,notify,notnull,oids,purge,rename,replace,retrieve,returns,rule,recipe,setof,stdin,stdout,store,vacuum,verbose,version";
	}

	public String getNumericFunctions() throws SQLException
	{
		// XXX-Not Implemented
		Driver.debug("getNumericFunctions");
		return "";
	}

	public String getStringFunctions() throws SQLException
	{
		// XXX-Not Implemented
		Driver.debug("getStringFunctions");
		return "";
	}

	public String getSystemFunctions() throws SQLException
	{
		// XXX-Not Implemented
		Driver.debug("getSystemFunctions");
		return "";
	}

	public String getTimeDateFunctions() throws SQLException
	{
		// XXX-Not Implemented
		Driver.debug("getTimeDateFunctions");
		return "";
	}

	/*
	 * This is the string that can be used to escape '_' and '%' in
	 * a search string pattern style catalog search parameters
	 *
	 * @return the string used to escape wildcard characters
	 * @exception SQLException if a database access error occurs
	 */
	public String getSearchStringEscape() throws SQLException
	{
		Driver.debug("getSearchStringEscape");
		return "\\";
	}

	/*
	 * Get all the "extra" characters that can be used in unquoted
	 * identifier names (those beyond a-zA-Z0-9 and _)
	 *
	 * <p>From the file src/backend/parser/scan.l, an identifier is
	 * {letter}{letter_or_digit} which makes it just those listed
	 * above.
	 *
	 * @return a string containing the extra characters
	 * @exception SQLException if a database access error occurs
	 */
	public String getExtraNameCharacters() throws SQLException
	{
		Driver.debug("getExtraNameCharacters");
		return "";
	}

	/*
	 * Is "ALTER TABLE" with an add column supported?
	 * Yes for PostgreSQL 6.1
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsAlterTableWithAddColumn() throws SQLException
	{
		Driver.debug("supportsAlterTableWithAddColumn " + true);
		return true;
	}

	/*
	 * Is "ALTER TABLE" with a drop column supported?
	 * Peter 10/10/2000 This was set to true, but 7.1devel doesn't support it!
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsAlterTableWithDropColumn() throws SQLException
	{
		Driver.debug("supportsAlterTableWithDropColumn " + false);
		return false;
	}

	/*
	 * Is column aliasing supported?
	 *
	 * <p>If so, the SQL AS clause can be used to provide names for
	 * computed columns or to provide alias names for columns as
	 * required.  A JDBC Compliant driver always returns true.
	 *
	 * <p>e.g.
	 *
	 * <br><pre>
	 * select count(C) as C_COUNT from T group by C;
	 *
	 * </pre><br>
	 * should return a column named as C_COUNT instead of count(C)
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsColumnAliasing() throws SQLException
	{
		Driver.debug("supportsColumnAliasing " + true);
		return true;
	}

	/*
	 * Are concatenations between NULL and non-NULL values NULL?  A
	 * JDBC Compliant driver always returns true
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean nullPlusNonNullIsNull() throws SQLException
	{
		Driver.debug("nullPlusNonNullIsNull " + true);
		return true;
	}

	public boolean supportsConvert() throws SQLException
	{
		// XXX-Not Implemented
		Driver.debug("supportsConvert " + false);
		return false;
	}

	public boolean supportsConvert(int fromType, int toType) throws SQLException
	{
		// XXX-Not Implemented
		Driver.debug("supportsConvert " + false);
		return false;
	}

	/*
	 * Are table correlation names supported? A JDBC Compliant
	 * driver always returns true.
	 *
	 * @return true if so; false otherwise
	 * @exception SQLException - if a database access error occurs
	 */
	public boolean supportsTableCorrelationNames() throws SQLException
	{
		Driver.debug("supportsTableCorrelationNames " + true);
		return true;
	}

	/*
	 * If table correlation names are supported, are they restricted to
	 * be different from the names of the tables?
	 *
	 * @return true if so; false otherwise
	 * @exception SQLException - if a database access error occurs
	 */
	public boolean supportsDifferentTableCorrelationNames() throws SQLException
	{
		Driver.debug("supportsDifferentTableCorrelationNames " + false);
		return false;
	}

	/*
	 * Are expressions in "ORDER BY" lists supported?
	 *
	 * <br>e.g. select * from t order by a + b;
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsExpressionsInOrderBy() throws SQLException
	{
		Driver.debug("supportsExpressionsInOrderBy " + true);
		return true;
	}

	/*
	 * Can an "ORDER BY" clause use columns not in the SELECT?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsOrderByUnrelated() throws SQLException
	{
		boolean supportsOrderByUnrelated = connection.haveMinimumServerVersion("6.4");
		Driver.debug("supportsOrderByUnrelated " + supportsOrderByUnrelated);
		return supportsOrderByUnrelated;
	}

	/*
	 * Is some form of "GROUP BY" clause supported?
	 * I checked it, and yes it is.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsGroupBy() throws SQLException
	{
		Driver.debug("supportsGroupBy " + true);
		return true;
	}

	/*
	 * Can a "GROUP BY" clause use columns not in the SELECT?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsGroupByUnrelated() throws SQLException
	{
		boolean supportsGroupByUnrelated = connection.haveMinimumServerVersion("6.4");
		Driver.debug("supportsGroupByUnrelated " + supportsGroupByUnrelated);
		return supportsGroupByUnrelated;
	}

	/*
	 * Can a "GROUP BY" clause add columns not in the SELECT provided
	 * it specifies all the columns in the SELECT?	Does anyone actually
	 * understand what they mean here?
	 *
	 * (I think this is a subset of the previous function. -- petere)
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsGroupByBeyondSelect() throws SQLException
	{
		boolean supportsGroupByBeyondSelect = connection.haveMinimumServerVersion("6.4");
		Driver.debug("supportsGroupByUnrelated " + supportsGroupByBeyondSelect);
		return supportsGroupByBeyondSelect;
	}

	/*
	 * Is the escape character in "LIKE" clauses supported?  A
	 * JDBC compliant driver always returns true.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsLikeEscapeClause() throws SQLException
	{
		boolean supportsLikeEscapeClause = connection.haveMinimumServerVersion("7.1");
		Driver.debug("supportsLikeEscapeClause " + supportsLikeEscapeClause);
		return supportsLikeEscapeClause;
	}

	/*
	 * Are multiple ResultSets from a single execute supported?
	 * Well, I implemented it, but I dont think this is possible from
	 * the back ends point of view.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsMultipleResultSets() throws SQLException
	{
		Driver.debug("supportsMultipleResultSets " + false);
		return false;
	}

	/*
	 * Can we have multiple transactions open at once (on different
	 * connections?)
	 * I guess we can have, since Im relying on it.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsMultipleTransactions() throws SQLException
	{
		Driver.debug("supportsMultipleTransactions " + true);
		return true;
	}

	/*
	 * Can columns be defined as non-nullable.	A JDBC Compliant driver
	 * always returns true.
	 *
	 * <p>This changed from false to true in v6.2 of the driver, as this
	 * support was added to the backend.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsNonNullableColumns() throws SQLException
	{
		Driver.debug("supportsNonNullableColumns true");
		return true;
	}

	/*
	 * Does this driver support the minimum ODBC SQL grammar.  This
	 * grammar is defined at:
	 *
	 * <p><a href="http://www.microsoft.com/msdn/sdk/platforms/doc/odbc/src/intropr.htm">http://www.microsoft.com/msdn/sdk/platforms/doc/odbc/src/intropr.htm</a>
	 *
	 * <p>In Appendix C.  From this description, we seem to support the
	 * ODBC minimal (Level 0) grammar.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsMinimumSQLGrammar() throws SQLException
	{
		Driver.debug("supportsMinimumSQLGrammar TRUE");
		return true;
	}

	/*
	 * Does this driver support the Core ODBC SQL grammar.	We need
	 * SQL-92 conformance for this.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsCoreSQLGrammar() throws SQLException
	{
		Driver.debug("supportsCoreSQLGrammar FALSE ");
		return false;
	}

	/*
	 * Does this driver support the Extended (Level 2) ODBC SQL
	 * grammar.  We don't conform to the Core (Level 1), so we can't
	 * conform to the Extended SQL Grammar.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsExtendedSQLGrammar() throws SQLException
	{
		Driver.debug("supportsExtendedSQLGrammar FALSE");
		return false;
	}

	/*
	 * Does this driver support the ANSI-92 entry level SQL grammar?
	 * All JDBC Compliant drivers must return true.  We currently
	 * report false until 'schema' support is added.  Then this
	 * should be changed to return true, since we will be mostly
	 * compliant (probably more compliant than many other databases)
	 * And since this is a requirement for all JDBC drivers we
	 * need to get to the point where we can return true.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsANSI92EntryLevelSQL() throws SQLException
	{
		Driver.debug("supportsANSI92EntryLevelSQL false ");
		return false;
	}

	/*
	 * Does this driver support the ANSI-92 intermediate level SQL
	 * grammar?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsANSI92IntermediateSQL() throws SQLException
	{
		Driver.debug("supportsANSI92IntermediateSQL false ");
		return false;
	}

	/*
	 * Does this driver support the ANSI-92 full SQL grammar?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsANSI92FullSQL() throws SQLException
	{
		Driver.debug("supportsANSI92FullSQL false ");
		return false;
	}

	/*
	 * Is the SQL Integrity Enhancement Facility supported?
	 * I haven't seen this mentioned anywhere, so I guess not
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsIntegrityEnhancementFacility() throws SQLException
	{
		Driver.debug("supportsIntegrityEnhancementFacility false ");
		return false;
	}

	/*
	 * Is some form of outer join supported?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsOuterJoins() throws SQLException
	{
		boolean supportsOuterJoins = connection.haveMinimumServerVersion("7.1");
		Driver.debug("supportsOuterJoins " + supportsOuterJoins);
		return supportsOuterJoins;
	}

	/*
	 * Are full nexted outer joins supported?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsFullOuterJoins() throws SQLException
	{
		boolean supportsFullOuterJoins = connection.haveMinimumServerVersion("7.1");
		Driver.debug("supportsFullOuterJoins " + supportsFullOuterJoins);
		return supportsFullOuterJoins;
	}

	/*
	 * Is there limited support for outer joins?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsLimitedOuterJoins() throws SQLException
	{
		boolean supportsLimitedOuterJoins = connection.haveMinimumServerVersion("7.1");
		Driver.debug("supportsFullOuterJoins " + supportsLimitedOuterJoins);
		return supportsLimitedOuterJoins;
	}

	/*
	 * What is the database vendor's preferred term for "schema"?
	 * PostgreSQL doesn't have schemas, but when it does, we'll use the
	 * term "schema".
	 *
	 * @return the vendor term
	 * @exception SQLException if a database access error occurs
	 */
	public String getSchemaTerm() throws SQLException
	{
		Driver.debug("getSchemaTerm schema");
		return "schema";
	}

	/*
	 * What is the database vendor's preferred term for "procedure"?
	 * Traditionally, "function" has been used.
	 *
	 * @return the vendor term
	 * @exception SQLException if a database access error occurs
	 */
	public String getProcedureTerm() throws SQLException
	{
		Driver.debug("getProcedureTerm function ");
		return "function";
	}

	/*
	 * What is the database vendor's preferred term for "catalog"?
	 *
	 * @return the vendor term
	 * @exception SQLException if a database access error occurs
	 */
	public String getCatalogTerm() throws SQLException
	{
		Driver.debug("getCatalogTerm database ");
		return "database";
	}

	/*
	 * Does a catalog appear at the start of a qualified table name?
	 * (Otherwise it appears at the end).
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean isCatalogAtStart() throws SQLException
	{
		// return true here; we return false for every other catalog function
		// so it won't matter what we return here D.C.
		Driver.debug("isCatalogAtStart not implemented");
		return true;
	}

	/*
	 * What is the Catalog separator.
	 *
	 * @return the catalog separator string
	 * @exception SQLException if a database access error occurs
	 */
	public String getCatalogSeparator() throws SQLException
	{
		// Give them something to work with here
		// everything else returns false so it won't matter what we return here D.C.
		Driver.debug("getCatalogSeparator not implemented ");
		return ".";
	}

	/*
	 * Can a schema name be used in a data manipulation statement?	Nope.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsSchemasInDataManipulation() throws SQLException
	{
		Driver.debug("supportsSchemasInDataManipulation false");
		return false;
	}

	/*
	 * Can a schema name be used in a procedure call statement?  Nope.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsSchemasInProcedureCalls() throws SQLException
	{
		Driver.debug("supportsSchemasInProcedureCalls false");
		return false;
	}

	/*
	 * Can a schema be used in a table definition statement?  Nope.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsSchemasInTableDefinitions() throws SQLException
	{
		Driver.debug("supportsSchemasInTableDefinitions false");
		return false;
	}

	/*
	 * Can a schema name be used in an index definition statement?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsSchemasInIndexDefinitions() throws SQLException
	{
		Driver.debug("supportsSchemasInIndexDefinitions false");
		return false;
	}

	/*
	 * Can a schema name be used in a privilege definition statement?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsSchemasInPrivilegeDefinitions() throws SQLException
	{
		Driver.debug("supportsSchemasInPrivilegeDefinitions false");
		return false;
	}

	/*
	 * Can a catalog name be used in a data manipulation statement?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsCatalogsInDataManipulation() throws SQLException
	{
		Driver.debug("supportsCatalogsInDataManipulation false");
		return false;
	}

	/*
	 * Can a catalog name be used in a procedure call statement?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsCatalogsInProcedureCalls() throws SQLException
	{
		Driver.debug("supportsCatalogsInDataManipulation false");
		return false;
	}

	/*
	 * Can a catalog name be used in a table definition statement?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsCatalogsInTableDefinitions() throws SQLException
	{
		Driver.debug("supportsCatalogsInTableDefinitions false");
		return false;
	}

	/*
	 * Can a catalog name be used in an index definition?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsCatalogsInIndexDefinitions() throws SQLException
	{
		Driver.debug("supportsCatalogsInIndexDefinitions false");
		return false;
	}

	/*
	 * Can a catalog name be used in a privilege definition statement?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsCatalogsInPrivilegeDefinitions() throws SQLException
	{
		Driver.debug("supportsCatalogsInPrivilegeDefinitions false");
		return false;
	}

	/*
	 * We support cursors for gets only it seems.  I dont see a method
	 * to get a positioned delete.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsPositionedDelete() throws SQLException
	{
		Driver.debug("supportsPositionedDelete false");
		return false;			// For now...
	}

	/*
	 * Is positioned UPDATE supported?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsPositionedUpdate() throws SQLException
	{
		Driver.debug("supportsPositionedUpdate false");
		return false;			// For now...
	}

	/*
	 * Is SELECT for UPDATE supported?
	 *
	 * @return true if so; false otherwise
	 * @exception SQLException - if a database access error occurs
	 */
	public boolean supportsSelectForUpdate() throws SQLException
	{
		return connection.haveMinimumServerVersion("6.5");
	}

	/*
	 * Are stored procedure calls using the stored procedure escape
	 * syntax supported?
	 *
	 * @return true if so; false otherwise
	 * @exception SQLException - if a database access error occurs
	 */
	public boolean supportsStoredProcedures() throws SQLException
	{
		return false;
	}

	/*
	 * Are subqueries in comparison expressions supported? A JDBC
	 * Compliant driver always returns true.
	 *
	 * @return true if so; false otherwise
	 * @exception SQLException - if a database access error occurs
	 */
	public boolean supportsSubqueriesInComparisons() throws SQLException
	{
		return true;
	}

	/*
	 * Are subqueries in 'exists' expressions supported? A JDBC
	 * Compliant driver always returns true.
	 *
	 * @return true if so; false otherwise
	 * @exception SQLException - if a database access error occurs
	 */
	public boolean supportsSubqueriesInExists() throws SQLException
	{
		return true;
	}

	/*
	 * Are subqueries in 'in' statements supported? A JDBC
	 * Compliant driver always returns true.
	 *
	 * @return true if so; false otherwise
	 * @exception SQLException - if a database access error occurs
	 */
	public boolean supportsSubqueriesInIns() throws SQLException
	{
		return true;
	}

	/*
	 * Are subqueries in quantified expressions supported? A JDBC
	 * Compliant driver always returns true.
	 *
	 * (No idea what this is, but we support a good deal of
	 * subquerying.)
	 *
	 * @return true if so; false otherwise
	 * @exception SQLException - if a database access error occurs
	 */
	public boolean supportsSubqueriesInQuantifieds() throws SQLException
	{
		return true;
	}

	/*
	 * Are correlated subqueries supported? A JDBC Compliant driver
	 * always returns true.
	 *
	 * (a.k.a. subselect in from?)
	 *
	 * @return true if so; false otherwise
	 * @exception SQLException - if a database access error occurs
	 */
	public boolean supportsCorrelatedSubqueries() throws SQLException
	{
		return connection.haveMinimumServerVersion("7.1");
	}

	/*
	 * Is SQL UNION supported?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsUnion() throws SQLException
	{
		return true; // since 6.3
	}

	/*
	 * Is SQL UNION ALL supported?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsUnionAll() throws SQLException
	{
		return connection.haveMinimumServerVersion("7.1");
	}

	/*
	 * In PostgreSQL, Cursors are only open within transactions.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsOpenCursorsAcrossCommit() throws SQLException
	{
		return false;
	}

	/*
	 * Do we support open cursors across multiple transactions?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsOpenCursorsAcrossRollback() throws SQLException
	{
		return false;
	}

	/*
	 * Can statements remain open across commits?  They may, but
	 * this driver cannot guarentee that.  In further reflection.
	 * we are talking a Statement object here, so the answer is
	 * yes, since the Statement is only a vehicle to ExecSQL()
	 *
	 * @return true if they always remain open; false otherwise
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsOpenStatementsAcrossCommit() throws SQLException
	{
		return true;
	}

	/*
	 * Can statements remain open across rollbacks?  They may, but
	 * this driver cannot guarentee that.  In further contemplation,
	 * we are talking a Statement object here, so the answer is yes,
	 * since the Statement is only a vehicle to ExecSQL() in Connection
	 *
	 * @return true if they always remain open; false otherwise
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsOpenStatementsAcrossRollback() throws SQLException
	{
		return true;
	}

	/*
	 * How many hex characters can you have in an inline binary literal
	 *
	 * @return the max literal length
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxBinaryLiteralLength() throws SQLException
	{
		return 0; // no limit
	}

	/*
	 * What is the maximum length for a character literal
	 * I suppose it is 8190 (8192 - 2 for the quotes)
	 *
	 * @return the max literal length
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxCharLiteralLength() throws SQLException
	{
		return 0; // no limit
	}

	/*
	 * Whats the limit on column name length.  The description of
	 * pg_class would say '32' (length of pg_class.relname) - we
	 * should probably do a query for this....but....
	 *
	 * @return the maximum column name length
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxColumnNameLength() throws SQLException
	{
		return 32;
	}

	/*
	 * What is the maximum number of columns in a "GROUP BY" clause?
	 *
	 * @return the max number of columns
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxColumnsInGroupBy() throws SQLException
	{
		return 0; // no limit
	}

	/*
	 * What's the maximum number of columns allowed in an index?
	 * 6.0 only allowed one column, but 6.1 introduced multi-column
	 * indices, so, theoretically, its all of them.
	 *
	 * @return max number of columns
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxColumnsInIndex() throws SQLException
	{
		return getMaxColumnsInTable();
	}

	/*
	 * What's the maximum number of columns in an "ORDER BY clause?
	 *
	 * @return the max columns
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxColumnsInOrderBy() throws SQLException
	{
		return 0; // no limit
	}

	/*
	 * What is the maximum number of columns in a "SELECT" list?
	 *
	 * @return the max columns
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxColumnsInSelect() throws SQLException
	{
		return 0; // no limit
	}

	/*
	 * What is the maximum number of columns in a table? From the
	 * CREATE TABLE reference page...
	 *
	 * <p>"The new class is created as a heap with no initial data.  A
	 * class can have no more than 1600 attributes (realistically,
	 * this is limited by the fact that tuple sizes must be less than
	 * 8192 bytes)..."
	 *
	 * @return the max columns
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxColumnsInTable() throws SQLException
	{
		return 1600;
	}

	/*
	 * How many active connection can we have at a time to this
	 * database?  Well, since it depends on postmaster, which just
	 * does a listen() followed by an accept() and fork(), its
	 * basically very high.  Unless the system runs out of processes,
	 * it can be 65535 (the number of aux. ports on a TCP/IP system).
	 * I will return 8192 since that is what even the largest system
	 * can realistically handle,
	 *
	 * @return the maximum number of connections
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxConnections() throws SQLException
	{
		return 8192;
	}

	/*
	 * What is the maximum cursor name length (the same as all
	 * the other F***** identifiers!)
	 *
	 * @return max cursor name length in bytes
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxCursorNameLength() throws SQLException
	{
		return 32;
	}

	/*
	 * Retrieves the maximum number of bytes for an index, including all
	 * of the parts of the index.
	 *
	 * @return max index length in bytes, which includes the composite
	 * of all the constituent parts of the index; a result of zero means
	 * that there is no limit or the limit is not known
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxIndexLength() throws SQLException
	{
		return 0; // no limit (larger than an int anyway)
	}

	public int getMaxSchemaNameLength() throws SQLException
	{
		// XXX-Not Implemented
		return 0;
	}

	/*
	 * What is the maximum length of a procedure name?
	 * (length of pg_proc.proname used) - again, I really
	 * should do a query here to get it.
	 *
	 * @return the max name length in bytes
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxProcedureNameLength() throws SQLException
	{
		return 32;
	}

	public int getMaxCatalogNameLength() throws SQLException
	{
		// XXX-Not Implemented
		return 0;
	}

	/*
	 * What is the maximum length of a single row?
	 *
	 * @return max row size in bytes
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxRowSize() throws SQLException
	{
		if (connection.haveMinimumServerVersion("7.1"))
			return 1073741824;	// 1 GB
		else
			return 8192;		// XXX could be altered
	}

	/*
	 * Did getMaxRowSize() include LONGVARCHAR and LONGVARBINARY
	 * blobs?  We don't handle blobs yet
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean doesMaxRowSizeIncludeBlobs() throws SQLException
	{
		return false;
	}

	/*
	 * What is the maximum length of a SQL statement?
	 *
	 * @return max length in bytes
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxStatementLength() throws SQLException
	{
		if (connection.haveMinimumServerVersion("7.0"))
			return 0;		// actually whatever fits in size_t
		else
			return 16384;
	}

	/*
	 * How many active statements can we have open at one time to
	 * this database?  Basically, since each Statement downloads
	 * the results as the query is executed, we can have many.	However,
	 * we can only really have one statement per connection going
	 * at once (since they are executed serially) - so we return
	 * one.
	 *
	 * @return the maximum
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxStatements() throws SQLException
	{
		return 1;
	}

	/*
	 * What is the maximum length of a table name?	This was found
	 * from pg_class.relname length
	 *
	 * @return max name length in bytes
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxTableNameLength() throws SQLException
	{
		return 32;
	}

	/*
	 * What is the maximum number of tables that can be specified
	 * in a SELECT?
	 *
	 * @return the maximum
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxTablesInSelect() throws SQLException
	{
		return 0; // no limit
	}

	/*
	 * What is the maximum length of a user name?  Well, we generally
	 * use UNIX like user names in PostgreSQL, so I think this would
	 * be 8.  However, showing the schema for pg_user shows a length
	 * for username of 32.
	 *
	 * @return the max name length in bytes
	 * @exception SQLException if a database access error occurs
	 */
	public int getMaxUserNameLength() throws SQLException
	{
		return 32;
	}


	/*
	 * What is the database's default transaction isolation level?  We
	 * do not support this, so all transactions are SERIALIZABLE.
	 *
	 * @return the default isolation level
	 * @exception SQLException if a database access error occurs
	 * @see Connection
	 */
	public int getDefaultTransactionIsolation() throws SQLException
	{
		return Connection.TRANSACTION_READ_COMMITTED;
	}

	/*
	 * Are transactions supported?	If not, commit and rollback are noops
	 * and the isolation level is TRANSACTION_NONE.  We do support
	 * transactions.
	 *
	 * @return true if transactions are supported
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsTransactions() throws SQLException
	{
		return true;
	}

	/*
	 * Does the database support the given transaction isolation level?
	 * We only support TRANSACTION_SERIALIZABLE and TRANSACTION_READ_COMMITTED
	 *
	 * @param level the values are defined in java.sql.Connection
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 * @see Connection
	 */
	public boolean supportsTransactionIsolationLevel(int level) throws SQLException
	{
		if (level == Connection.TRANSACTION_SERIALIZABLE ||
				level == Connection.TRANSACTION_READ_COMMITTED)
			return true;
		else
			return false;
	}

	/*
	 * Are both data definition and data manipulation transactions
	 * supported?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsDataDefinitionAndDataManipulationTransactions() throws SQLException
	{
		return true;
	}

	/*
	 * Are only data manipulation statements withing a transaction
	 * supported?
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean supportsDataManipulationTransactionsOnly() throws SQLException
	{
		return false;
	}

	/*
	 * Does a data definition statement within a transaction force
	 * the transaction to commit?  I think this means something like:
	 *
	 * <p><pre>
	 * CREATE TABLE T (A INT);
	 * INSERT INTO T (A) VALUES (2);
	 * BEGIN;
	 * UPDATE T SET A = A + 1;
	 * CREATE TABLE X (A INT);
	 * SELECT A FROM T INTO X;
	 * COMMIT;
	 * </pre><p>
	 *
	 * does the CREATE TABLE call cause a commit?  The answer is no.
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean dataDefinitionCausesTransactionCommit() throws SQLException
	{
		return false;
	}

	/*
	 * Is a data definition statement within a transaction ignored?
	 * It seems to be (from experiment in previous method)
	 *
	 * @return true if so
	 * @exception SQLException if a database access error occurs
	 */
	public boolean dataDefinitionIgnoredInTransactions() throws SQLException
	{
		return true;
	}

	/*
	 * Get a description of stored procedures available in a catalog
	 *
	 * <p>Only procedure descriptions matching the schema and procedure
	 * name criteria are returned.	They are ordered by PROCEDURE_SCHEM
	 * and PROCEDURE_NAME
	 *
	 * <p>Each procedure description has the following columns:
	 * <ol>
	 * <li><b>PROCEDURE_CAT</b> String => procedure catalog (may be null)
	 * <li><b>PROCEDURE_SCHEM</b> String => procedure schema (may be null)
	 * <li><b>PROCEDURE_NAME</b> String => procedure name
	 * <li><b>Field 4</b> reserved (make it null)
	 * <li><b>Field 5</b> reserved (make it null)
	 * <li><b>Field 6</b> reserved (make it null)
	 * <li><b>REMARKS</b> String => explanatory comment on the procedure
	 * <li><b>PROCEDURE_TYPE</b> short => kind of procedure
	 *	<ul>
	 *	  <li> procedureResultUnknown - May return a result
	 *	<li> procedureNoResult - Does not return a result
	 *	<li> procedureReturnsResult - Returns a result
	 *	  </ul>
	 * </ol>
	 *
	 * @param catalog - a catalog name; "" retrieves those without a
	 *	catalog; null means drop catalog name from criteria
	 * @param schemaParrern - a schema name pattern; "" retrieves those
	 *	without a schema - we ignore this parameter
	 * @param procedureNamePattern - a procedure name pattern
	 * @return ResultSet - each row is a procedure description
	 * @exception SQLException if a database access error occurs
	 */
	public java.sql.ResultSet getProcedures(String catalog, String schemaPattern, String procedureNamePattern) throws SQLException
	{
		// the field descriptors for the new ResultSet
		Field f[] = new Field[8];
		java.sql.ResultSet r;	// ResultSet for the SQL query that we need to do
		Vector v = new Vector();		// The new ResultSet tuple stuff

		f[0] = new Field(connection, "PROCEDURE_CAT", iVarcharOid, 32);
		f[1] = new Field(connection, "PROCEDURE_SCHEM", iVarcharOid, 32);
		f[2] = new Field(connection, "PROCEDURE_NAME", iVarcharOid, 32);
		f[3] = f[4] = f[5] = new Field(connection, "reserved", iVarcharOid, 32);	// null;	// reserved, must be null for now
		f[6] = new Field(connection, "REMARKS", iVarcharOid, 8192);
		f[7] = new Field(connection, "PROCEDURE_TYPE", iInt2Oid, 2);

		// If the pattern is null, then set it to the default
		if (procedureNamePattern == null)
			procedureNamePattern = "%";

		r = connection.ExecSQL("select proname, proretset from pg_proc where proname like '" + procedureNamePattern.toLowerCase() + "' order by proname");

		while (r.next())
		{
			byte[][] tuple = new byte[8][0];

			tuple[0] = null;			// Catalog name
			tuple[1] = null;			// Schema name
			tuple[2] = r.getBytes(1);		// Procedure name
			tuple[3] = tuple[4] = tuple[5] = null;	// Reserved
			tuple[6] = null;

			if (r.getBoolean(2))
				tuple[7] = Integer.toString(java.sql.DatabaseMetaData.procedureReturnsResult).getBytes();
			else
				tuple[7] = Integer.toString(java.sql.DatabaseMetaData.procedureNoResult).getBytes();

			v.addElement(tuple);
		}
		return new ResultSet(connection, f, v, "OK", 1);
	}

	/*
	 * Get a description of a catalog's stored procedure parameters
	 * and result columns.
	 *
	 * <p>Only descriptions matching the schema, procedure and parameter
	 * name criteria are returned. They are ordered by PROCEDURE_SCHEM
	 * and PROCEDURE_NAME. Within this, the return value, if any, is
	 * first. Next are the parameter descriptions in call order. The
	 * column descriptions follow in column number order.
	 *
	 * <p>Each row in the ResultSet is a parameter description or column
	 * description with the following fields:
	 * <ol>
	 * <li><b>PROCEDURE_CAT</b> String => procedure catalog (may be null)
	 * <li><b>PROCEDURE_SCHE</b>M String => procedure schema (may be null)
	 * <li><b>PROCEDURE_NAME</b> String => procedure name
	 * <li><b>COLUMN_NAME</b> String => column/parameter name
	 * <li><b>COLUMN_TYPE</b> Short => kind of column/parameter:
	 * <ul><li>procedureColumnUnknown - nobody knows
	 * <li>procedureColumnIn - IN parameter
	 * <li>procedureColumnInOut - INOUT parameter
	 * <li>procedureColumnOut - OUT parameter
	 * <li>procedureColumnReturn - procedure return value
	 * <li>procedureColumnResult - result column in ResultSet
	 * </ul>
	 * <li><b>DATA_TYPE</b> short => SQL type from java.sql.Types
	 * <li><b>TYPE_NAME</b> String => SQL type name
	 * <li><b>PRECISION</b> int => precision
	 * <li><b>LENGTH</b> int => length in bytes of data
	 * <li><b>SCALE</b> short => scale
	 * <li><b>RADIX</b> short => radix
	 * <li><b>NULLABLE</b> short => can it contain NULL?
	 * <ul><li>procedureNoNulls - does not allow NULL values
	 * <li>procedureNullable - allows NULL values
	 * <li>procedureNullableUnknown - nullability unknown
	 * <li><b>REMARKS</b> String => comment describing parameter/column
	 * </ol>
	 * @param catalog This is ignored in org.postgresql, advise this is set to null
	 * @param schemaPattern This is ignored in org.postgresql, advise this is set to null
	 * @param procedureNamePattern a procedure name pattern
	 * @param columnNamePattern a column name pattern
	 * @return each row is a stored procedure parameter or column description
	 * @exception SQLException if a database-access error occurs
	 * @see #getSearchStringEscape
	 */
	// Implementation note: This is required for Borland's JBuilder to work
	public java.sql.ResultSet getProcedureColumns(String catalog, String schemaPattern, String procedureNamePattern, String columnNamePattern) throws SQLException
	{
		if (procedureNamePattern == null)
			procedureNamePattern = "%";

		if (columnNamePattern == null)
			columnNamePattern = "%";

		// for now, this returns an empty result set.
		Field f[] = new Field[13];
		ResultSet r;	// ResultSet for the SQL query that we need to do
		Vector v = new Vector();		// The new ResultSet tuple stuff

		f[0] = new Field(connection, "PROCEDURE_CAT", iVarcharOid, 32);
		f[1] = new Field(connection, "PROCEDURE_SCHEM", iVarcharOid, 32);
		f[2] = new Field(connection, "PROCEDURE_NAME", iVarcharOid, 32);
		f[3] = new Field(connection, "COLUMN_NAME", iVarcharOid, 32);
		f[4] = new Field(connection, "COLUMN_TYPE", iInt2Oid, 2);
		f[5] = new Field(connection, "DATA_TYPE", iInt2Oid, 2);
		f[6] = new Field(connection, "TYPE_NAME", iVarcharOid, 32);
		f[7] = new Field(connection, "PRECISION", iInt4Oid, 4);
		f[8] = new Field(connection, "LENGTH", iInt4Oid, 4);
		f[9] = new Field(connection, "SCALE", iInt2Oid, 2);
		f[10] = new Field(connection, "RADIX", iInt2Oid, 2);
		f[11] = new Field(connection, "NULLABLE", iInt2Oid, 2);
		f[12] = new Field(connection, "REMARKS", iVarcharOid, 32);

		// add query loop here

		return new ResultSet(connection, f, v, "OK", 1);
	}

	/*
	 * Get a description of tables available in a catalog.
	 *
	 * <p>Only table descriptions matching the catalog, schema, table
	 * name and type criteria are returned. They are ordered by
	 * TABLE_TYPE, TABLE_SCHEM and TABLE_NAME.
	 *
	 * <p>Each table description has the following columns:
	 *
	 * <ol>
	 * <li><b>TABLE_CAT</b> String => table catalog (may be null)
	 * <li><b>TABLE_SCHEM</b> String => table schema (may be null)
	 * <li><b>TABLE_NAME</b> String => table name
	 * <li><b>TABLE_TYPE</b> String => table type. Typical types are "TABLE",
	 * "VIEW", "SYSTEM TABLE", "GLOBAL TEMPORARY", "LOCAL
	 * TEMPORARY", "ALIAS", "SYNONYM".
	 * <li><b>REMARKS</b> String => explanatory comment on the table
	 * </ol>
	 *
	 * <p>The valid values for the types parameter are:
	 * "TABLE", "INDEX", "SEQUENCE", "SYSTEM TABLE" and "SYSTEM INDEX"
	 *
	 * @param catalog a catalog name; For org.postgresql, this is ignored, and
	 * should be set to null
	 * @param schemaPattern a schema name pattern; For org.postgresql, this is ignored, and
	 * should be set to null
	 * @param tableNamePattern a table name pattern. For all tables this should be "%"
	 * @param types a list of table types to include; null returns
	 * all types
	 * @return each row is a table description
	 * @exception SQLException if a database-access error occurs.
	 */
	public java.sql.ResultSet getTables(String catalog, String schemaPattern, String tableNamePattern, String types[]) throws SQLException
	{
		// Handle default value for types
		if (types == null)
			types = defaultTableTypes;

		if (tableNamePattern == null)
			tableNamePattern = "%";

		// the field descriptors for the new ResultSet
		Field f[] = new Field[5];
		java.sql.ResultSet r;	// ResultSet for the SQL query that we need to do
		Vector v = new Vector();		// The new ResultSet tuple stuff

		f[0] = new Field(connection, "TABLE_CAT", iVarcharOid, 32);
		f[1] = new Field(connection, "TABLE_SCHEM", iVarcharOid, 32);
		f[2] = new Field(connection, "TABLE_NAME", iVarcharOid, 32);
		f[3] = new Field(connection, "TABLE_TYPE", iVarcharOid, 32);
		f[4] = new Field(connection, "REMARKS", iVarcharOid, 32);

		// Now form the query
		StringBuffer sql = new StringBuffer("select relname,oid,relkind from pg_class where (");

		boolean notFirst = false;
		for (int i = 0;i < types.length;i++)
		{
			for (int j = 0;j < getTableTypes.length;j++)
				if (getTableTypes[j][0].equals(types[i]))
				{
					if (notFirst)
						sql.append(" or ");
					sql.append(getTableTypes[j][1]);
					notFirst = true;
				}
		}

		// Added by Stefan Andreasen <stefan@linux.kapow.dk>
		// Now take the pattern into account
		sql.append(") and relname like '");
		sql.append(tableNamePattern.toLowerCase());
		sql.append("' order by relkind, relname");

		// Now run the query
		r = connection.ExecSQL(sql.toString());

		while (r.next())
		{
			byte[][] tuple = new byte[5][0];

			// Fetch the description for the table (if any)
			String getDescriptionStatement =
				connection.haveMinimumServerVersion("7.2") ?
				"select obj_description(" + r.getInt(2) + ",'pg_class')" :
				"select description from pg_description where objoid=" + r.getInt(2);

			java.sql.ResultSet dr = connection.ExecSQL(getDescriptionStatement);

			byte remarks[] = null;

			if (((org.postgresql.ResultSet)dr).getTupleCount() == 1)
			{
				dr.next();
				remarks = dr.getBytes(1);
			}
			dr.close();

			String relKind;
			switch (r.getBytes(3)[0])
			{
				case (byte) 'r':
					relKind = "TABLE";
					break;
				case (byte) 'i':
					relKind = "INDEX";
					break;
				case (byte) 'S':
					relKind = "SEQUENCE";
					break;
				case (byte) 'v':
					relKind = "VIEW";
					break;
				default:
					relKind = null;
			}

			tuple[0] = null;		// Catalog name
			tuple[1] = null;		// Schema name
			tuple[2] = r.getBytes(1);	// Table name
			tuple[3] = (relKind == null) ? null : relKind.getBytes();	// Table type
			tuple[4] = remarks;		// Remarks
			v.addElement(tuple);
		}
		r.close();
		return new ResultSet(connection, f, v, "OK", 1);
	}

	// This array contains the valid values for the types argument
	// in getTables().
	//
	// Each supported type consists of it's name, and the sql where
	// clause to retrieve that value.
	//
	// IMPORTANT: the query must be enclosed in ( )
	private static final String getTableTypes[][] = {
				{"TABLE", "(relkind='r' and relhasrules='f' and relname !~ '^pg_' and relname !~ '^xinv')"},
				{"VIEW", "(relkind='v' and relname !~ '^pg_')"},
				{"INDEX", "(relkind='i' and relname !~ '^pg_')"},
				{"SEQUENCE", "(relkind='S' and relname !~ '^pg_')"},
				{"SYSTEM TABLE", "(relkind='r' and relname ~ '^pg_')"},
				{"SYSTEM INDEX", "(relkind='i' and relname ~ '^pg_')"}
			};

	// These are the default tables, used when NULL is passed to getTables
	// The choice of these provide the same behaviour as psql's \d
	private static final String defaultTableTypes[] = {
				"TABLE", "VIEW", "INDEX", "SEQUENCE"
			};

	/*
	 * Get the schema names available in this database.  The results
	 * are ordered by schema name.
	 *
	 * <P>The schema column is:
	 *	<OL>
	 *	<LI><B>TABLE_SCHEM</B> String => schema name
	 *	</OL>
	 *
	 * @return ResultSet each row has a single String column that is a
	 * schema name
	 */
	public java.sql.ResultSet getSchemas() throws SQLException
	{
		// We don't use schemas, so we simply return a single schema name "".
		//
		Field f[] = new Field[1];
		Vector v = new Vector();
		byte[][] tuple = new byte[1][0];
		f[0] = new Field(connection, "TABLE_SCHEM", iVarcharOid, 32);
		tuple[0] = "".getBytes();
		v.addElement(tuple);
		return new ResultSet(connection, f, v, "OK", 1);
	}

	/*
	 * Get the catalog names available in this database.  The results
	 * are ordered by catalog name.
	 *
	 * <P>The catalog column is:
	 *	<OL>
	 *	<LI><B>TABLE_CAT</B> String => catalog name
	 *	</OL>
	 *
	 * @return ResultSet each row has a single String column that is a
	 * catalog name
	 */
	public java.sql.ResultSet getCatalogs() throws SQLException
	{
		return connection.createStatement().executeQuery("select datname as TABLE_CAT from pg_database;");
	}

	/*
	 * Get the table types available in this database.	The results
	 * are ordered by table type.
	 *
	 * <P>The table type is:
	 *	<OL>
	 *	<LI><B>TABLE_TYPE</B> String => table type.  Typical types are "TABLE",
	 *			"VIEW", "SYSTEM TABLE", "GLOBAL TEMPORARY",
	 *			"LOCAL TEMPORARY", "ALIAS", "SYNONYM".
	 *	</OL>
	 *
	 * @return ResultSet each row has a single String column that is a
	 * table type
	 */
	public java.sql.ResultSet getTableTypes() throws SQLException
	{
		Field f[] = new Field[1];
		Vector v = new Vector();
		f[0] = new Field(connection, new String("TABLE_TYPE"), iVarcharOid, 32);
		for (int i = 0;i < getTableTypes.length;i++)
		{
			byte[][] tuple = new byte[2][0];
			tuple[0] = getTableTypes[i][0].getBytes();
			v.addElement(tuple);
		}
		return new ResultSet(connection, f, v, "OK", 1);
	}

	/*
	 * Get a description of table columns available in a catalog.
	 *
	 * <P>Only column descriptions matching the catalog, schema, table
	 * and column name criteria are returned.  They are ordered by
	 * TABLE_SCHEM, TABLE_NAME and ORDINAL_POSITION.
	 *
	 * <P>Each column description has the following columns:
	 *	<OL>
	 *	<LI><B>TABLE_CAT</B> String => table catalog (may be null)
	 *	<LI><B>TABLE_SCHEM</B> String => table schema (may be null)
	 *	<LI><B>TABLE_NAME</B> String => table name
	 *	<LI><B>COLUMN_NAME</B> String => column name
	 *	<LI><B>DATA_TYPE</B> short => SQL type from java.sql.Types
	 *	<LI><B>TYPE_NAME</B> String => Data source dependent type name
	 *	<LI><B>COLUMN_SIZE</B> int => column size.	For char or date
	 *		types this is the maximum number of characters, for numeric or
	 *		decimal types this is precision.
	 *	<LI><B>BUFFER_LENGTH</B> is not used.
	 *	<LI><B>DECIMAL_DIGITS</B> int => the number of fractional digits
	 *	<LI><B>NUM_PREC_RADIX</B> int => Radix (typically either 10 or 2)
	 *	<LI><B>NULLABLE</B> int => is NULL allowed?
	 *		<UL>
	 *		<LI> columnNoNulls - might not allow NULL values
	 *		<LI> columnNullable - definitely allows NULL values
	 *		<LI> columnNullableUnknown - nullability unknown
	 *		</UL>
	 *	<LI><B>REMARKS</B> String => comment describing column (may be null)
	 *	<LI><B>COLUMN_DEF</B> String => default value (may be null)
	 *	<LI><B>SQL_DATA_TYPE</B> int => unused
	 *	<LI><B>SQL_DATETIME_SUB</B> int => unused
	 *	<LI><B>CHAR_OCTET_LENGTH</B> int => for char types the
	 *		 maximum number of bytes in the column
	 *	<LI><B>ORDINAL_POSITION</B> int => index of column in table
	 *		(starting at 1)
	 *	<LI><B>IS_NULLABLE</B> String => "NO" means column definitely
	 *		does not allow NULL values; "YES" means the column might
	 *		allow NULL values.	An empty string means nobody knows.
	 *	</OL>
	 *
	 * @param catalog a catalog name; "" retrieves those without a catalog
	 * @param schemaPattern a schema name pattern; "" retrieves those
	 * without a schema
	 * @param tableNamePattern a table name pattern
	 * @param columnNamePattern a column name pattern
	 * @return ResultSet each row is a column description
	 * @see #getSearchStringEscape
	 */
	public java.sql.ResultSet getColumns(String catalog, String schemaPattern, String tableNamePattern, String columnNamePattern) throws SQLException
	{
		Vector v = new Vector();		// The new ResultSet tuple stuff
		Field f[] = new Field[18];		// The field descriptors for the new ResultSet

		f[0] = new Field(connection, "TABLE_CAT", iVarcharOid, 32);
		f[1] = new Field(connection, "TABLE_SCHEM", iVarcharOid, 32);
		f[2] = new Field(connection, "TABLE_NAME", iVarcharOid, 32);
		f[3] = new Field(connection, "COLUMN_NAME", iVarcharOid, 32);
		f[4] = new Field(connection, "DATA_TYPE", iInt2Oid, 2);
		f[5] = new Field(connection, "TYPE_NAME", iVarcharOid, 32);
		f[6] = new Field(connection, "COLUMN_SIZE", iInt4Oid, 4);
		f[7] = new Field(connection, "BUFFER_LENGTH", iVarcharOid, 32);
		f[8] = new Field(connection, "DECIMAL_DIGITS", iInt4Oid, 4);
		f[9] = new Field(connection, "NUM_PREC_RADIX", iInt4Oid, 4);
		f[10] = new Field(connection, "NULLABLE", iInt4Oid, 4);
		f[11] = new Field(connection, "REMARKS", iVarcharOid, 32);
		f[12] = new Field(connection, "COLUMN_DEF", iVarcharOid, 32);
		f[13] = new Field(connection, "SQL_DATA_TYPE", iInt4Oid, 4);
		f[14] = new Field(connection, "SQL_DATETIME_SUB", iInt4Oid, 4);
		f[15] = new Field(connection, "CHAR_OCTET_LENGTH", iVarcharOid, 32);
		f[16] = new Field(connection, "ORDINAL_POSITION", iInt4Oid, 4);
		f[17] = new Field(connection, "IS_NULLABLE", iVarcharOid, 32);

		StringBuffer sql = new StringBuffer(512);

		/* Build a >= 7.1 SQL statement to list all columns */
		sql.append("select " +
				   (connection.haveMinimumServerVersion("7.2") ? "a.attrelid, " : "a.oid, ") +
				   "    c.relname, " +
				   "    a.attname, " +
				   "    a.atttypid, " +
				   "    a.attnum, " +
				   "    a.attnotnull, " +
				   "    a.attlen, " +
				   "    a.atttypmod, " +
				   "    d.adsrc, " +
				   "    t.typname, " +
				   /* Use the new col_description in 7.2 or an additional outer join in 7.1 */
				   (connection.haveMinimumServerVersion("7.2") ? "col_description(a.attrelid, a.attnum) " : "e.description ") +
				   "from" +
				   "    (" +
				   "        (pg_class c inner join pg_attribute a on" +
				   "            (" +
				   "                a.attrelid=c.oid");

		if ((tableNamePattern != null) && ! tableNamePattern.equals("%"))
		{
			sql.append("                and c.relname like \'" + tableNamePattern + "\'");
		}

		if ((columnNamePattern != null) && ! columnNamePattern.equals("%"))
		{
			sql.append("                and a.attname like \'" + columnNamePattern + "\'");
		}

		sql.append(
			"                and a.attnum > 0" +
			"            )" +
			"        ) inner join pg_type t on" +
			"            (" +
			"                t.oid = a.atttypid" +
			"            )" +
			"    )" +
			"    left outer join pg_attrdef d on" +
			"        (" +
			"            c.oid = d.adrelid" +
			"            and a.attnum = d.adnum" +
			"        ) ");

		if (!connection.haveMinimumServerVersion("7.2"))
		{
			/* Only for 7.1 */
			sql.append(
				"    left outer join pg_description e on" +
				"        (" +
				"            e.objoid = a.oid" +
				"        ) ");
		}

		sql.append("order by" +
				   "    c.relname, a.attnum");

		java.sql.ResultSet r = connection.ExecSQL(sql.toString());
		while (r.next())
		{
			byte[][] tuple = new byte[18][0];

			String nullFlag = r.getString(6);
			String typname = r.getString(10);

			tuple[0] = null;						// Catalog name, not supported
			tuple[1] = null;						// Schema name, not supported
			tuple[2] = r.getBytes(2);				// Table name
			tuple[3] = r.getBytes(3);				// Column name
			tuple[4] = Integer.toString(connection.getSQLType(typname)).getBytes(); // Data type
			tuple[5] = typname.getBytes();			// Type name

			// Column size
			// Looking at the psql source,
			// I think the length of a varchar as specified when the table was created
			// should be extracted from atttypmod which contains this length + sizeof(int32)
			if (typname.equals("bpchar") || typname.equals("varchar"))
			{
				int atttypmod = r.getInt(8);
				tuple[6] = Integer.toString(atttypmod != -1 ? atttypmod - VARHDRSZ : 0).getBytes();
			}
			else
			{
				tuple[6] = r.getBytes(7);
			}

			tuple[7] = null;						// Buffer length
			// Decimal digits = scale
			// From the source (see e.g. backend/utils/adt/numeric.c,
			// function numeric()) the scale and precision can be calculated
			// from the typmod value.
			if (typname.equals("numeric") || typname.equals("decimal"))
			{
				int attypmod = r.getInt(8);
				tuple[8] =
					Integer.toString((attypmod - VARHDRSZ) & 0xffff).getBytes();
			}
			else
				tuple[8] = "0".getBytes();
			tuple[9] = "10".getBytes();				// Num Prec Radix - assume decimal
			tuple[10] = Integer.toString(nullFlag.equals("f") ?
										 java.sql.DatabaseMetaData.columnNullable :
										 java.sql.DatabaseMetaData.columnNoNulls).getBytes();	// Nullable
			tuple[11] = r.getBytes(11);				// Description (if any)
			tuple[12] = r.getBytes(9);				// Column default
			tuple[13] = null;						// sql data type (unused)
			tuple[14] = null;						// sql datetime sub (unused)
			tuple[15] = tuple[6];					// char octet length
			tuple[16] = r.getBytes(5);				// ordinal position
			tuple[17] = (nullFlag.equals("f") ? "YES" : "NO").getBytes();	// Is nullable

			v.addElement(tuple);
		}
		r.close();

		return new ResultSet(connection, f, v, "OK", 1);
	}

	/*
	 * Get a description of the access rights for a table's columns.
	 *
	 * <P>Only privileges matching the column name criteria are
	 * returned.  They are ordered by COLUMN_NAME and PRIVILEGE.
	 *
	 * <P>Each privilige description has the following columns:
	 *	<OL>
	 *	<LI><B>TABLE_CAT</B> String => table catalog (may be null)
	 *	<LI><B>TABLE_SCHEM</B> String => table schema (may be null)
	 *	<LI><B>TABLE_NAME</B> String => table name
	 *	<LI><B>COLUMN_NAME</B> String => column name
	 *	<LI><B>GRANTOR</B> => grantor of access (may be null)
	 *	<LI><B>GRANTEE</B> String => grantee of access
	 *	<LI><B>PRIVILEGE</B> String => name of access (SELECT,
	 *		INSERT, UPDATE, REFRENCES, ...)
	 *	<LI><B>IS_GRANTABLE</B> String => "YES" if grantee is permitted
	 *		to grant to others; "NO" if not; null if unknown
	 *	</OL>
	 *
	 * @param catalog a catalog name; "" retrieves those without a catalog
	 * @param schema a schema name; "" retrieves those without a schema
	 * @param table a table name
	 * @param columnNamePattern a column name pattern
	 * @return ResultSet each row is a column privilege description
	 * @see #getSearchStringEscape
	 */
	public java.sql.ResultSet getColumnPrivileges(String catalog, String schema, String table, String columnNamePattern) throws SQLException
	{
		Field f[] = new Field[8];
		Vector v = new Vector();

		if (table == null)
			table = "%";

		if (columnNamePattern == null)
			columnNamePattern = "%";
		else
			columnNamePattern = columnNamePattern.toLowerCase();

		f[0] = new Field(connection, "TABLE_CAT", iVarcharOid, 32);
		f[1] = new Field(connection, "TABLE_SCHEM", iVarcharOid, 32);
		f[2] = new Field(connection, "TABLE_NAME", iVarcharOid, 32);
		f[3] = new Field(connection, "COLUMN_NAME", iVarcharOid, 32);
		f[4] = new Field(connection, "GRANTOR", iVarcharOid, 32);
		f[5] = new Field(connection, "GRANTEE", iVarcharOid, 32);
		f[6] = new Field(connection, "PRIVILEGE", iVarcharOid, 32);
		f[7] = new Field(connection, "IS_GRANTABLE", iVarcharOid, 32);

		// This is taken direct from the psql source
		java.sql.ResultSet r = connection.ExecSQL("SELECT relname, relacl FROM pg_class, pg_user WHERE ( relkind = 'r' OR relkind = 'i') and relname !~ '^pg_' and relname !~ '^xin[vx][0-9]+' and usesysid = relowner and relname like '" + table.toLowerCase() + "' ORDER BY relname");
		while (r.next())
		{
			byte[][] tuple = new byte[8][0];
			tuple[0] = tuple[1] = "".getBytes();
			DriverManager.println("relname=\"" + r.getString(1) + "\" relacl=\"" + r.getString(2) + "\"");

			// For now, don't add to the result as relacl needs to be processed.
			//v.addElement(tuple);
		}

		return new ResultSet(connection, f, v, "OK", 1);
	}

	/*
	 * Get a description of the access rights for each table available
	 * in a catalog.
	 *
	 * This method is currently unimplemented.
	 *
	 * <P>Only privileges matching the schema and table name
	 * criteria are returned.  They are ordered by TABLE_SCHEM,
	 * TABLE_NAME, and PRIVILEGE.
	 *
	 * <P>Each privilige description has the following columns:
	 *	<OL>
	 *	<LI><B>TABLE_CAT</B> String => table catalog (may be null)
	 *	<LI><B>TABLE_SCHEM</B> String => table schema (may be null)
	 *	<LI><B>TABLE_NAME</B> String => table name
	 *	<LI><B>COLUMN_NAME</B> String => column name
	 *	<LI><B>GRANTOR</B> => grantor of access (may be null)
	 *	<LI><B>GRANTEE</B> String => grantee of access
	 *	<LI><B>PRIVILEGE</B> String => name of access (SELECT,
	 *		INSERT, UPDATE, REFRENCES, ...)
	 *	<LI><B>IS_GRANTABLE</B> String => "YES" if grantee is permitted
	 *		to grant to others; "NO" if not; null if unknown
	 *	</OL>
	 *
	 * @param catalog a catalog name; "" retrieves those without a catalog
	 * @param schemaPattern a schema name pattern; "" retrieves those
	 * without a schema
	 * @param tableNamePattern a table name pattern
	 * @return ResultSet each row is a table privilege description
	 * @see #getSearchStringEscape
	 */
	public java.sql.ResultSet getTablePrivileges(String catalog, String schemaPattern, String tableNamePattern) throws SQLException
	{
		Field f[] = new Field[8];
		Vector v = new Vector();

		if (tableNamePattern == null)
			tableNamePattern = "%";

		f[0] = new Field(connection, "TABLE_CAT", iVarcharOid, 32);
		f[1] = new Field(connection, "TABLE_SCHEM", iVarcharOid, 32);
		f[2] = new Field(connection, "TABLE_NAME", iVarcharOid, 32);
		f[3] = new Field(connection, "COLUMN_NAME", iVarcharOid, 32);
		f[4] = new Field(connection, "GRANTOR", iVarcharOid, 32);
		f[5] = new Field(connection, "GRANTEE", iVarcharOid, 32);
		f[6] = new Field(connection, "PRIVILEGE", iVarcharOid, 32);
		f[7] = new Field(connection, "IS_GRANTABLE", iVarcharOid, 32);

		// This is taken direct from the psql source
		java.sql.ResultSet r = connection.ExecSQL("SELECT relname, relacl FROM pg_class, pg_user WHERE ( relkind = 'r' OR relkind = 'i') and relname !~ '^pg_' and relname !~ '^xin[vx][0-9]+' and usesysid = relowner and relname like '" + tableNamePattern.toLowerCase() + "' ORDER BY relname");
		while (r.next())
		{
			byte[][] tuple = new byte[8][0];
			tuple[0] = tuple[1] = "".getBytes();
			DriverManager.println("relname=\"" + r.getString(1) + "\" relacl=\"" + r.getString(2) + "\"");

			// For now, don't add to the result as relacl needs to be processed.
			//v.addElement(tuple);
		}

		return new ResultSet(connection, f, v, "OK", 1);
	}

	/*
	 * Get a description of a table's optimal set of columns that
	 * uniquely identifies a row. They are ordered by SCOPE.
	 *
	 * This method is currently not implemented.
	 *
	 * <P>Each column description has the following columns:
	 *	<OL>
	 *	<LI><B>SCOPE</B> short => actual scope of result
	 *		<UL>
	 *		<LI> bestRowTemporary - very temporary, while using row
	 *		<LI> bestRowTransaction - valid for remainder of current transaction
	 *		<LI> bestRowSession - valid for remainder of current session
	 *		</UL>
	 *	<LI><B>COLUMN_NAME</B> String => column name
	 *	<LI><B>DATA_TYPE</B> short => SQL data type from java.sql.Types
	 *	<LI><B>TYPE_NAME</B> String => Data source dependent type name
	 *	<LI><B>COLUMN_SIZE</B> int => precision
	 *	<LI><B>BUFFER_LENGTH</B> int => not used
	 *	<LI><B>DECIMAL_DIGITS</B> short  => scale
	 *	<LI><B>PSEUDO_COLUMN</B> short => is this a pseudo column
	 *		like an Oracle ROWID
	 *		<UL>
	 *		<LI> bestRowUnknown - may or may not be pseudo column
	 *		<LI> bestRowNotPseudo - is NOT a pseudo column
	 *		<LI> bestRowPseudo - is a pseudo column
	 *		</UL>
	 *	</OL>
	 *
	 * @param catalog a catalog name; "" retrieves those without a catalog
	 * @param schema a schema name; "" retrieves those without a schema
	 * @param table a table name
	 * @param scope the scope of interest; use same values as SCOPE
	 * @param nullable include columns that are nullable?
	 * @return ResultSet each row is a column description
	 */
	// Implementation note: This is required for Borland's JBuilder to work
	public java.sql.ResultSet getBestRowIdentifier(String catalog, String schema, String table, int scope, boolean nullable) throws SQLException
	{
		// for now, this returns an empty result set.
		Field f[] = new Field[8];
		ResultSet r;	// ResultSet for the SQL query that we need to do
		Vector v = new Vector();		// The new ResultSet tuple stuff

		f[0] = new Field(connection, "SCOPE", iInt2Oid, 2);
		f[1] = new Field(connection, "COLUMN_NAME", iVarcharOid, 32);
		f[2] = new Field(connection, "DATA_TYPE", iInt2Oid, 2);
		f[3] = new Field(connection, "TYPE_NAME", iVarcharOid, 32);
		f[4] = new Field(connection, "COLUMN_SIZE", iInt4Oid, 4);
		f[5] = new Field(connection, "BUFFER_LENGTH", iInt4Oid, 4);
		f[6] = new Field(connection, "DECIMAL_DIGITS", iInt2Oid, 2);
		f[7] = new Field(connection, "PSEUDO_COLUMN", iInt2Oid, 2);

		return new ResultSet(connection, f, v, "OK", 1);
	}

	/*
	 * Get a description of a table's columns that are automatically
	 * updated when any value in a row is updated.	They are
	 * unordered.
	 *
	 * This method is currently unimplemented.
	 *
	 * <P>Each column description has the following columns:
	 *	<OL>
	 *	<LI><B>SCOPE</B> short => is not used
	 *	<LI><B>COLUMN_NAME</B> String => column name
	 *	<LI><B>DATA_TYPE</B> short => SQL data type from java.sql.Types
	 *	<LI><B>TYPE_NAME</B> String => Data source dependent type name
	 *	<LI><B>COLUMN_SIZE</B> int => precision
	 *	<LI><B>BUFFER_LENGTH</B> int => length of column value in bytes
	 *	<LI><B>DECIMAL_DIGITS</B> short  => scale
	 *	<LI><B>PSEUDO_COLUMN</B> short => is this a pseudo column
	 *		like an Oracle ROWID
	 *		<UL>
	 *		<LI> versionColumnUnknown - may or may not be pseudo column
	 *		<LI> versionColumnNotPseudo - is NOT a pseudo column
	 *		<LI> versionColumnPseudo - is a pseudo column
	 *		</UL>
	 *	</OL>
	 *
	 * @param catalog a catalog name; "" retrieves those without a catalog
	 * @param schema a schema name; "" retrieves those without a schema
	 * @param table a table name
	 * @return ResultSet each row is a column description
	 */
	public java.sql.ResultSet getVersionColumns(String catalog, String schema, String table) throws SQLException
	{
		throw org.postgresql.Driver.notImplemented();
	}

	/*
	 * Get a description of a table's primary key columns.  They
	 * are ordered by COLUMN_NAME.
	 *
	 * <P>Each column description has the following columns:
	 *	<OL>
	 *	<LI><B>TABLE_CAT</B> String => table catalog (may be null)
	 *	<LI><B>TABLE_SCHEM</B> String => table schema (may be null)
	 *	<LI><B>TABLE_NAME</B> String => table name
	 *	<LI><B>COLUMN_NAME</B> String => column name
	 *	<LI><B>KEY_SEQ</B> short => sequence number within primary key
	 *	<LI><B>PK_NAME</B> String => primary key name (may be null)
	 *	</OL>
	 *
	 * @param catalog a catalog name; "" retrieves those without a catalog
	 * @param schema a schema name pattern; "" retrieves those
	 * without a schema
	 * @param table a table name
	 * @return ResultSet each row is a primary key column description
	 */
	public java.sql.ResultSet getPrimaryKeys(String catalog, String schema, String table) throws SQLException
	{
		return connection.createStatement().executeQuery("SELECT " +
				"'' as TABLE_CAT," +
				"'' AS TABLE_SCHEM," +
				"bc.relname AS TABLE_NAME," +
				"a.attname AS COLUMN_NAME," +
				"a.attnum as KEY_SEQ," +
				"ic.relname as PK_NAME " +
				" FROM pg_class bc, pg_class ic, pg_index i, pg_attribute a" +
				" WHERE bc.relkind = 'r' " +   //	-- not indices
				"  and upper(bc.relname) = upper('" + table + "')" +
				"  and i.indrelid = bc.oid" +
				"  and i.indexrelid = ic.oid" +
				"  and ic.oid = a.attrelid" +
				"  and i.indisprimary='t' " +
				" ORDER BY table_name, pk_name, key_seq"
														);
	}

	private java.sql.ResultSet getImportedExportedKeys(String catalog, String schema, String primaryTable, String foreignTable) throws SQLException
	{
		Field f[] = new Field[14];

		f[0] = new Field(connection, "PKTABLE_CAT", iVarcharOid, 32);
		f[1] = new Field(connection, "PKTABLE_SCHEM", iVarcharOid, 32);
		f[2] = new Field(connection, "PKTABLE_NAME", iVarcharOid, 32);
		f[3] = new Field(connection, "PKCOLUMN_NAME", iVarcharOid, 32);
		f[4] = new Field(connection, "FKTABLE_CAT", iVarcharOid, 32);
		f[5] = new Field(connection, "FKTABLE_SCHEM", iVarcharOid, 32);
		f[6] = new Field(connection, "FKTABLE_NAME", iVarcharOid, 32);
		f[7] = new Field(connection, "FKCOLUMN_NAME", iVarcharOid, 32);
		f[8] = new Field(connection, "KEY_SEQ", iInt2Oid, 2);
		f[9] = new Field(connection, "UPDATE_RULE", iInt2Oid, 2);
		f[10] = new Field(connection, "DELETE_RULE", iInt2Oid, 2);
		f[11] = new Field(connection, "FK_NAME", iVarcharOid, 32);
		f[12] = new Field(connection, "PK_NAME", iVarcharOid, 32);
		f[13] = new Field(connection, "DEFERRABILITY", iInt2Oid, 2);

		java.sql.ResultSet rs = connection.ExecSQL("SELECT c.relname,c2.relname,"
								+ "t.tgconstrname,ic.relname,"
								+ "t.tgdeferrable,t.tginitdeferred,"
								+ "t.tgnargs,t.tgargs,p.proname "
								+ "FROM pg_trigger t,pg_class c,pg_class c2,"
								+ "pg_class ic,pg_proc p, pg_index i "
								+ "WHERE t.tgrelid=c.oid AND t.tgconstrrelid=c2.oid "
								+ "AND t.tgfoid=p.oid AND tgisconstraint "
								+ ((primaryTable != null) ? "AND c.relname='" + primaryTable + "' " : "")
								+ ((foreignTable != null) ? "AND c2.relname='" + foreignTable + "' " : "")
								+ "AND i.indrelid=c.oid "
								+ "AND i.indexrelid=ic.oid AND i.indisprimary "
								+ "ORDER BY c.relname,c2.relname"
												  );
		Vector tuples = new Vector();
		short seq = 0;
		if (rs.next())
		{
			boolean hasMore;
			do
			{
				byte tuple[][] = new byte[14][0];
				for (int k = 0;k < 14;k++)
					tuple[k] = null;

				String fKeyName = rs.getString(3);
				boolean foundRule = false;
				do
				{
					String proname = rs.getString(9);
					if (proname != null && proname.startsWith("RI_FKey_"))
					{
						int col = -1;
						if (proname.endsWith("_upd"))
							col = 9; // UPDATE_RULE
						else if (proname.endsWith("_del"))
							col = 10; // DELETE_RULE
						if (col > -1)
						{
							String rule = proname.substring(8, proname.length() - 4);
							int action = importedKeyNoAction;
							if ("cascade".equals(rule))
								action = importedKeyCascade;
							else if ("setnull".equals(rule))
								action = importedKeySetNull;
							else if ("setdefault".equals(rule))
								action = importedKeySetDefault;
							tuple[col] = Integer.toString(action).getBytes();

							if (!foundRule)
							{
								tuple[2] = rs.getBytes(1); //PKTABLE_NAME
								tuple[6] = rs.getBytes(2); //FKTABLE_NAME

								// Parse the tgargs data
								StringBuffer fkeyColumns = new StringBuffer();
								StringBuffer pkeyColumns = new StringBuffer();
								int numColumns = (rs.getInt(7) >> 1) - 2;
								String s = rs.getString(8);
								int pos = s.lastIndexOf("\\000");
								for (int c = 0;c < numColumns;c++)
								{
									if (pos > -1)
									{
										int pos2 = s.lastIndexOf("\\000", pos - 1);
										if (pos2 > -1)
										{
											if (pkeyColumns.length() > 0)
											        pkeyColumns.insert(0, ',');
											pkeyColumns.insert(0, s.substring(pos2 + 4, pos)); //PKCOLUMN_NAME
											pos = s.lastIndexOf("\\000", pos2 - 1);
											if (pos > -1)
											{
												if (fkeyColumns.length() > 0)
												    fkeyColumns.insert(0, ',');
												fkeyColumns.insert(0, s.substring(pos + 4, pos2)); //FKCOLUMN_NAME
											}
										}
									}
								}
								tuple[3] = pkeyColumns.toString().getBytes(); //PKCOLUMN_NAME
								tuple[7] = fkeyColumns.toString().getBytes(); //FKCOLUMN_NAME

								tuple[8] = Integer.toString(seq++).getBytes(); //KEY_SEQ
								tuple[11] = fKeyName.getBytes(); //FK_NAME
								tuple[12] = rs.getBytes(4); //PK_NAME

								// DEFERRABILITY
								int deferrability = importedKeyNotDeferrable;
								boolean deferrable = rs.getBoolean(5);
								boolean initiallyDeferred = rs.getBoolean(6);
								if (deferrable)
								{
									if (initiallyDeferred)
									        deferrability = importedKeyInitiallyDeferred;
									else
									        deferrability = importedKeyInitiallyImmediate;
								}
								tuple[13] = Integer.toString(deferrability).getBytes();

								foundRule = true;
							}
						}
					}
				}
				while ((hasMore = rs.next()) && fKeyName.equals(rs.getString(3)));

				if(foundRule) tuples.addElement(tuple);

			}
			while (hasMore);
		}

		return new ResultSet(connection, f, tuples, "OK", 1);
	}

	/*
	 * Get a description of the primary key columns that are
	 * referenced by a table's foreign key columns (the primary keys
	 * imported by a table).  They are ordered by PKTABLE_CAT,
	 * PKTABLE_SCHEM, PKTABLE_NAME, and KEY_SEQ.
	 *
	 * <P>Each primary key column description has the following columns:
	 *	<OL>
	 *	<LI><B>PKTABLE_CAT</B> String => primary key table catalog
	 *		being imported (may be null)
	 *	<LI><B>PKTABLE_SCHEM</B> String => primary key table schema
	 *		being imported (may be null)
	 *	<LI><B>PKTABLE_NAME</B> String => primary key table name
	 *		being imported
	 *	<LI><B>PKCOLUMN_NAME</B> String => primary key column name
	 *		being imported
	 *	<LI><B>FKTABLE_CAT</B> String => foreign key table catalog (may be null)
	 *	<LI><B>FKTABLE_SCHEM</B> String => foreign key table schema (may be null)
	 *	<LI><B>FKTABLE_NAME</B> String => foreign key table name
	 *	<LI><B>FKCOLUMN_NAME</B> String => foreign key column name
	 *	<LI><B>KEY_SEQ</B> short => sequence number within foreign key
	 *	<LI><B>UPDATE_RULE</B> short => What happens to
	 *		 foreign key when primary is updated:
	 *		<UL>
	 *		<LI> importedKeyCascade - change imported key to agree
	 *				 with primary key update
	 *		<LI> importedKeyRestrict - do not allow update of primary
	 *				 key if it has been imported
	 *		<LI> importedKeySetNull - change imported key to NULL if
	 *				 its primary key has been updated
	 *		</UL>
	 *	<LI><B>DELETE_RULE</B> short => What happens to
	 *		the foreign key when primary is deleted.
	 *		<UL>
	 *		<LI> importedKeyCascade - delete rows that import a deleted key
	 *		<LI> importedKeyRestrict - do not allow delete of primary
	 *				 key if it has been imported
	 *		<LI> importedKeySetNull - change imported key to NULL if
	 *				 its primary key has been deleted
	 *		</UL>
	 *	<LI><B>FK_NAME</B> String => foreign key name (may be null)
	 *	<LI><B>PK_NAME</B> String => primary key name (may be null)
	 *	</OL>
	 *
	 * @param catalog a catalog name; "" retrieves those without a catalog
	 * @param schema a schema name pattern; "" retrieves those
	 * without a schema
	 * @param table a table name
	 * @return ResultSet each row is a primary key column description
	 * @see #getExportedKeys
	 */
	public java.sql.ResultSet getImportedKeys(String catalog, String schema, String table) throws SQLException
	{
		return getImportedExportedKeys(catalog, schema, null, table);
	}

	/*
	 * Get a description of a foreign key columns that reference a
	 * table's primary key columns (the foreign keys exported by a
	 * table).	They are ordered by FKTABLE_CAT, FKTABLE_SCHEM,
	 * FKTABLE_NAME, and KEY_SEQ.
	 *
	 * This method is currently unimplemented.
	 *
	 * <P>Each foreign key column description has the following columns:
	 *	<OL>
	 *	<LI><B>PKTABLE_CAT</B> String => primary key table catalog (may be null)
	 *	<LI><B>PKTABLE_SCHEM</B> String => primary key table schema (may be null)
	 *	<LI><B>PKTABLE_NAME</B> String => primary key table name
	 *	<LI><B>PKCOLUMN_NAME</B> String => primary key column name
	 *	<LI><B>FKTABLE_CAT</B> String => foreign key table catalog (may be null)
	 *		being exported (may be null)
	 *	<LI><B>FKTABLE_SCHEM</B> String => foreign key table schema (may be null)
	 *		being exported (may be null)
	 *	<LI><B>FKTABLE_NAME</B> String => foreign key table name
	 *		being exported
	 *	<LI><B>FKCOLUMN_NAME</B> String => foreign key column name
	 *		being exported
	 *	<LI><B>KEY_SEQ</B> short => sequence number within foreign key
	 *	<LI><B>UPDATE_RULE</B> short => What happens to
	 *		 foreign key when primary is updated:
	 *		<UL>
	 *		<LI> importedKeyCascade - change imported key to agree
	 *				 with primary key update
	 *		<LI> importedKeyRestrict - do not allow update of primary
	 *				 key if it has been imported
	 *		<LI> importedKeySetNull - change imported key to NULL if
	 *				 its primary key has been updated
	 *		</UL>
	 *	<LI><B>DELETE_RULE</B> short => What happens to
	 *		the foreign key when primary is deleted.
	 *		<UL>
	 *		<LI> importedKeyCascade - delete rows that import a deleted key
	 *		<LI> importedKeyRestrict - do not allow delete of primary
	 *				 key if it has been imported
	 *		<LI> importedKeySetNull - change imported key to NULL if
	 *				 its primary key has been deleted
	 *		</UL>
	 *	<LI><B>FK_NAME</B> String => foreign key identifier (may be null)
	 *	<LI><B>PK_NAME</B> String => primary key identifier (may be null)
	 *	</OL>
	 *
	 * @param catalog a catalog name; "" retrieves those without a catalog
	 * @param schema a schema name pattern; "" retrieves those
	 * without a schema
	 * @param table a table name
	 * @return ResultSet each row is a foreign key column description
	 * @see #getImportedKeys
	 */
	public java.sql.ResultSet getExportedKeys(String catalog, String schema, String table) throws SQLException
	{
		return getImportedExportedKeys(catalog, schema, table, null);
	}

	/*
	 * Get a description of the foreign key columns in the foreign key
	 * table that reference the primary key columns of the primary key
	 * table (describe how one table imports another's key.) This
	 * should normally return a single foreign key/primary key pair
	 * (most tables only import a foreign key from a table once.)  They
	 * are ordered by FKTABLE_CAT, FKTABLE_SCHEM, FKTABLE_NAME, and
	 * KEY_SEQ.
	 *
	 * This method is currently unimplemented.
	 *
	 * <P>Each foreign key column description has the following columns:
	 *	<OL>
	 *	<LI><B>PKTABLE_CAT</B> String => primary key table catalog (may be null)
	 *	<LI><B>PKTABLE_SCHEM</B> String => primary key table schema (may be null)
	 *	<LI><B>PKTABLE_NAME</B> String => primary key table name
	 *	<LI><B>PKCOLUMN_NAME</B> String => primary key column name
	 *	<LI><B>FKTABLE_CAT</B> String => foreign key table catalog (may be null)
	 *		being exported (may be null)
	 *	<LI><B>FKTABLE_SCHEM</B> String => foreign key table schema (may be null)
	 *		being exported (may be null)
	 *	<LI><B>FKTABLE_NAME</B> String => foreign key table name
	 *		being exported
	 *	<LI><B>FKCOLUMN_NAME</B> String => foreign key column name
	 *		being exported
	 *	<LI><B>KEY_SEQ</B> short => sequence number within foreign key
	 *	<LI><B>UPDATE_RULE</B> short => What happens to
	 *		 foreign key when primary is updated:
	 *		<UL>
	 *		<LI> importedKeyCascade - change imported key to agree
	 *				 with primary key update
	 *		<LI> importedKeyRestrict - do not allow update of primary
	 *				 key if it has been imported
	 *		<LI> importedKeySetNull - change imported key to NULL if
	 *				 its primary key has been updated
	 *		</UL>
	 *	<LI><B>DELETE_RULE</B> short => What happens to
	 *		the foreign key when primary is deleted.
	 *		<UL>
	 *		<LI> importedKeyCascade - delete rows that import a deleted key
	 *		<LI> importedKeyRestrict - do not allow delete of primary
	 *				 key if it has been imported
	 *		<LI> importedKeySetNull - change imported key to NULL if
	 *				 its primary key has been deleted
	 *		</UL>
	 *	<LI><B>FK_NAME</B> String => foreign key identifier (may be null)
	 *	<LI><B>PK_NAME</B> String => primary key identifier (may be null)
	 *	</OL>
	 *
	 * @param catalog a catalog name; "" retrieves those without a catalog
	 * @param schema a schema name pattern; "" retrieves those
	 * without a schema
	 * @param table a table name
	 * @return ResultSet each row is a foreign key column description
	 * @see #getImportedKeys
	 */
	public java.sql.ResultSet getCrossReference(String primaryCatalog, String primarySchema, String primaryTable, String foreignCatalog, String foreignSchema, String foreignTable) throws SQLException
	{
		return getImportedExportedKeys(primaryCatalog, primarySchema, primaryTable, foreignTable);
	}

	/*
	 * Get a description of all the standard SQL types supported by
	 * this database. They are ordered by DATA_TYPE and then by how
	 * closely the data type maps to the corresponding JDBC SQL type.
	 *
	 * <P>Each type description has the following columns:
	 *	<OL>
	 *	<LI><B>TYPE_NAME</B> String => Type name
	 *	<LI><B>DATA_TYPE</B> short => SQL data type from java.sql.Types
	 *	<LI><B>PRECISION</B> int => maximum precision
	 *	<LI><B>LITERAL_PREFIX</B> String => prefix used to quote a literal
	 *		(may be null)
	 *	<LI><B>LITERAL_SUFFIX</B> String => suffix used to quote a literal
	 (may be null)
	 *	<LI><B>CREATE_PARAMS</B> String => parameters used in creating
	 *		the type (may be null)
	 *	<LI><B>NULLABLE</B> short => can you use NULL for this type?
	 *		<UL>
	 *		<LI> typeNoNulls - does not allow NULL values
	 *		<LI> typeNullable - allows NULL values
	 *		<LI> typeNullableUnknown - nullability unknown
	 *		</UL>
	 *	<LI><B>CASE_SENSITIVE</B> boolean=> is it case sensitive?
	 *	<LI><B>SEARCHABLE</B> short => can you use "WHERE" based on this type:
	 *		<UL>
	 *		<LI> typePredNone - No support
	 *		<LI> typePredChar - Only supported with WHERE .. LIKE
	 *		<LI> typePredBasic - Supported except for WHERE .. LIKE
	 *		<LI> typeSearchable - Supported for all WHERE ..
	 *		</UL>
	 *	<LI><B>UNSIGNED_ATTRIBUTE</B> boolean => is it unsigned?
	 *	<LI><B>FIXED_PREC_SCALE</B> boolean => can it be a money value?
	 *	<LI><B>AUTO_INCREMENT</B> boolean => can it be used for an
	 *		auto-increment value?
	 *	<LI><B>LOCAL_TYPE_NAME</B> String => localized version of type name
	 *		(may be null)
	 *	<LI><B>MINIMUM_SCALE</B> short => minimum scale supported
	 *	<LI><B>MAXIMUM_SCALE</B> short => maximum scale supported
	 *	<LI><B>SQL_DATA_TYPE</B> int => unused
	 *	<LI><B>SQL_DATETIME_SUB</B> int => unused
	 *	<LI><B>NUM_PREC_RADIX</B> int => usually 2 or 10
	 *	</OL>
	 *
	 * @return ResultSet each row is a SQL type description
	 */
	public java.sql.ResultSet getTypeInfo() throws SQLException
	{
		java.sql.ResultSet rs = connection.ExecSQL("select typname from pg_type");
		if (rs != null)
		{
			Field f[] = new Field[18];
			ResultSet r;	// ResultSet for the SQL query that we need to do
			Vector v = new Vector();		// The new ResultSet tuple stuff

			f[0] = new Field(connection, "TYPE_NAME", iVarcharOid, 32);
			f[1] = new Field(connection, "DATA_TYPE", iInt2Oid, 2);
			f[2] = new Field(connection, "PRECISION", iInt4Oid, 4);
			f[3] = new Field(connection, "LITERAL_PREFIX", iVarcharOid, 32);
			f[4] = new Field(connection, "LITERAL_SUFFIX", iVarcharOid, 32);
			f[5] = new Field(connection, "CREATE_PARAMS", iVarcharOid, 32);
			f[6] = new Field(connection, "NULLABLE", iInt2Oid, 2);
			f[7] = new Field(connection, "CASE_SENSITIVE", iBoolOid, 1);
			f[8] = new Field(connection, "SEARCHABLE", iInt2Oid, 2);
			f[9] = new Field(connection, "UNSIGNED_ATTRIBUTE", iBoolOid, 1);
			f[10] = new Field(connection, "FIXED_PREC_SCALE", iBoolOid, 1);
			f[11] = new Field(connection, "AUTO_INCREMENT", iBoolOid, 1);
			f[12] = new Field(connection, "LOCAL_TYPE_NAME", iVarcharOid, 32);
			f[13] = new Field(connection, "MINIMUM_SCALE", iInt2Oid, 2);
			f[14] = new Field(connection, "MAXIMUM_SCALE", iInt2Oid, 2);
			f[15] = new Field(connection, "SQL_DATA_TYPE", iInt4Oid, 4);
			f[16] = new Field(connection, "SQL_DATETIME_SUB", iInt4Oid, 4);
			f[17] = new Field(connection, "NUM_PREC_RADIX", iInt4Oid, 4);

			// cache some results, this will keep memory useage down, and speed
			// things up a little.
			byte b9[] = "9".getBytes();
			byte b10[] = "10".getBytes();
			byte bf[] = "f".getBytes();
			byte bnn[] = Integer.toString(typeNoNulls).getBytes();
			byte bts[] = Integer.toString(typeSearchable).getBytes();

			while (rs.next())
			{
				byte[][] tuple = new byte[18][];
				String typname = rs.getString(1);
				tuple[0] = typname.getBytes();
				tuple[1] = Integer.toString(connection.getSQLType(typname)).getBytes();
				tuple[2] = b9;	// for now
				tuple[6] = bnn; // for now
				tuple[7] = bf; // false for now - not case sensitive
				tuple[8] = bts;
				tuple[9] = bf; // false for now - it's signed
				tuple[10] = bf; // false for now - must handle money
				tuple[11] = bf; // false for now - handle autoincrement
				// 12 - LOCAL_TYPE_NAME is null
				// 13 & 14 ?
				// 15 & 16 are unused so we return null
				tuple[17] = b10; // everything is base 10
				v.addElement(tuple);
			}
			rs.close();
			return new ResultSet(connection, f, v, "OK", 1);
		}

		throw new PSQLException("postgresql.metadata.unavailable");
	}

	/*
	 * Get a description of a table's indices and statistics. They are
	 * ordered by NON_UNIQUE, TYPE, INDEX_NAME, and ORDINAL_POSITION.
	 *
	 * <P>Each index column description has the following columns:
	 *	<OL>
	 *	<LI><B>TABLE_CAT</B> String => table catalog (may be null)
	 *	<LI><B>TABLE_SCHEM</B> String => table schema (may be null)
	 *	<LI><B>TABLE_NAME</B> String => table name
	 *	<LI><B>NON_UNIQUE</B> boolean => Can index values be non-unique?
	 *		false when TYPE is tableIndexStatistic
	 *	<LI><B>INDEX_QUALIFIER</B> String => index catalog (may be null);
	 *		null when TYPE is tableIndexStatistic
	 *	<LI><B>INDEX_NAME</B> String => index name; null when TYPE is
	 *		tableIndexStatistic
	 *	<LI><B>TYPE</B> short => index type:
	 *		<UL>
	 *		<LI> tableIndexStatistic - this identifies table statistics that are
	 *			 returned in conjuction with a table's index descriptions
	 *		<LI> tableIndexClustered - this is a clustered index
	 *		<LI> tableIndexHashed - this is a hashed index
	 *		<LI> tableIndexOther - this is some other style of index
	 *		</UL>
	 *	<LI><B>ORDINAL_POSITION</B> short => column sequence number
	 *		within index; zero when TYPE is tableIndexStatistic
	 *	<LI><B>COLUMN_NAME</B> String => column name; null when TYPE is
	 *		tableIndexStatistic
	 *	<LI><B>ASC_OR_DESC</B> String => column sort sequence, "A" => ascending
	 *		"D" => descending, may be null if sort sequence is not supported;
	 *		null when TYPE is tableIndexStatistic
	 *	<LI><B>CARDINALITY</B> int => When TYPE is tableIndexStatisic then
	 *		this is the number of rows in the table; otherwise it is the
	 *		number of unique values in the index.
	 *	<LI><B>PAGES</B> int => When TYPE is  tableIndexStatisic then
	 *		this is the number of pages used for the table, otherwise it
	 *		is the number of pages used for the current index.
	 *	<LI><B>FILTER_CONDITION</B> String => Filter condition, if any.
	 *		(may be null)
	 *	</OL>
	 *
	 * @param catalog a catalog name; "" retrieves those without a catalog
	 * @param schema a schema name pattern; "" retrieves those without a schema
	 * @param table a table name
	 * @param unique when true, return only indices for unique values;
	 *	   when false, return indices regardless of whether unique or not
	 * @param approximate when true, result is allowed to reflect approximate
	 *	   or out of data values; when false, results are requested to be
	 *	   accurate
	 * @return ResultSet each row is an index column description
	 */
	// Implementation note: This is required for Borland's JBuilder to work
	public java.sql.ResultSet getIndexInfo(String catalog, String schema, String tableName, boolean unique, boolean approximate) throws SQLException
	{
		Field f[] = new Field[13];
		java.sql.ResultSet r;	// ResultSet for the SQL query that we need to do
		Vector v = new Vector();		// The new ResultSet tuple stuff

		f[0] = new Field(connection, "TABLE_CAT", iVarcharOid, 32);
		f[1] = new Field(connection, "TABLE_SCHEM", iVarcharOid, 32);
		f[2] = new Field(connection, "TABLE_NAME", iVarcharOid, 32);
		f[3] = new Field(connection, "NON_UNIQUE", iBoolOid, 1);
		f[4] = new Field(connection, "INDEX_QUALIFIER", iVarcharOid, 32);
		f[5] = new Field(connection, "INDEX_NAME", iVarcharOid, 32);
		f[6] = new Field(connection, "TYPE", iInt2Oid, 2);
		f[7] = new Field(connection, "ORDINAL_POSITION", iInt2Oid, 2);
		f[8] = new Field(connection, "COLUMN_NAME", iVarcharOid, 32);
		f[9] = new Field(connection, "ASC_OR_DESC", iVarcharOid, 32);
		f[10] = new Field(connection, "CARDINALITY", iInt4Oid, 4);
		f[11] = new Field(connection, "PAGES", iInt4Oid, 4);
		f[12] = new Field(connection, "FILTER_CONDITION", iVarcharOid, 32);

		r = connection.ExecSQL("select " +
							   "c.relname, " +
							   "x.indisunique, " +
							   "i.relname, " +
							   "x.indisclustered, " +
							   "a.amname, " +
							   "x.indkey, " +
							   "c.reltuples, " +
							   "c.relpages, " +
							   "x.indexrelid " +
							   "FROM pg_index x, pg_class c, pg_class i, pg_am a " +
							   "WHERE ((c.relname = '" + tableName.toLowerCase() + "') " +
							   " AND (c.oid = x.indrelid) " +
							   " AND (i.oid = x.indexrelid) " +
							   " AND (i.relam = a.oid)) " +
							   "ORDER BY x.indisunique DESC, " +
							   " x.indisclustered, a.amname, i.relname");
		while (r.next())
		{
			// indkey is an array of column ordinals (integers).  In the JDBC
			// interface, this has to be separated out into a separate
			// tuple for each indexed column.  Also, getArray() is not yet
			// implemented for Postgres JDBC, so we parse by hand.
			String columnOrdinalString = r.getString(6);
			StringTokenizer stok = new StringTokenizer(columnOrdinalString);
			int [] columnOrdinals = new int[stok.countTokens()];
			int o = 0;
			while (stok.hasMoreTokens())
			{
				columnOrdinals[o++] = Integer.parseInt(stok.nextToken());
			}
			for (int i = 0; i < columnOrdinals.length; i++)
			{
				byte [] [] tuple = new byte [13] [];
				tuple[0] = "".getBytes();
				tuple[1] = "".getBytes();
				tuple[2] = r.getBytes(1);
				tuple[3] = r.getBoolean(2) ? "false".getBytes() : "true".getBytes();
				tuple[4] = null;
				tuple[5] = r.getBytes(3);
				tuple[6] = r.getBoolean(4) ?
						   Integer.toString(tableIndexClustered).getBytes() :
						   r.getString(5).equals("hash") ?
						   Integer.toString(tableIndexHashed).getBytes() :
						   Integer.toString(tableIndexOther).getBytes();
				tuple[7] = Integer.toString(i + 1).getBytes();
				java.sql.ResultSet columnNameRS = connection.ExecSQL("select a.attname FROM pg_attribute a WHERE (a.attnum = " + columnOrdinals[i] + ") AND (a.attrelid = " + r.getInt(9) + ")");
				if (columnNameRS.next())
					tuple[8] = columnNameRS.getBytes(1);
				else
					tuple[8] = "".getBytes();
				tuple[8] = columnNameRS.getBytes(1);
				tuple[9] = null;  // sort sequence ???
				tuple[10] = r.getBytes(7);	// inexact
				tuple[11] = r.getBytes(8);
				tuple[12] = null;
				v.addElement(tuple);
			}
		}

		return new ResultSet(connection, f, v, "OK", 1);
	}


	// ** JDBC 2 Extensions **

	/*
	 * Does the database support the given result set type?
	 *
	 * @param type - defined in java.sql.ResultSet
	 * @return true if so; false otherwise
	 * @exception SQLException - if a database access error occurs
	 */
	public boolean supportsResultSetType(int type) throws SQLException
	{
		// The only type we don't support
		return type != java.sql.ResultSet.TYPE_SCROLL_SENSITIVE;
	}


	/*
	 * Does the database support the concurrency type in combination
	 * with the given result set type?
	 *
	 * @param type - defined in java.sql.ResultSet
	 * @param concurrency - type defined in java.sql.ResultSet
	 * @return true if so; false otherwise
	 * @exception SQLException - if a database access error occurs
	*/
	public boolean supportsResultSetConcurrency(int type, int concurrency) throws SQLException
	{
		// These combinations are not supported!
		if (type == java.sql.ResultSet.TYPE_SCROLL_SENSITIVE)
			return false;

		// We don't yet support Updateable ResultSets
		if (concurrency == java.sql.ResultSet.CONCUR_UPDATABLE)
			return false;

		// Everything else we do
		return true;
	}


	/* lots of unsupported stuff... */
	public boolean ownUpdatesAreVisible(int type) throws SQLException
	{
		return false;
	}

	public boolean ownDeletesAreVisible(int type) throws SQLException
	{
		return false;
	}

	public boolean ownInsertsAreVisible(int type) throws SQLException
	{
		return false;
	}

	public boolean othersUpdatesAreVisible(int type) throws SQLException
	{
		return false;
	}

	public boolean othersDeletesAreVisible(int i) throws SQLException
	{
		return false;
	}

	public boolean othersInsertsAreVisible(int type) throws SQLException
	{
		return false;
	}

	public boolean updatesAreDetected(int type) throws SQLException
	{
		return false;
	}

	public boolean deletesAreDetected(int i) throws SQLException
	{
		return false;
	}

	public boolean insertsAreDetected(int type) throws SQLException
	{
		return false;
	}

	/*
	 * Indicates whether the driver supports batch updates.
	 */
	public boolean supportsBatchUpdates() throws SQLException
	{
		return true;
	}

	/*
	 * Return user defined types in a schema
	 */
	public java.sql.ResultSet getUDTs(String catalog,
									  String schemaPattern,
									  String typeNamePattern,
									  int[] types
									 ) throws SQLException
	{
		throw org.postgresql.Driver.notImplemented();
	}


	/*
	 * Retrieves the connection that produced this metadata object.
	 *
	 * @return the connection that produced this metadata object
	 */
	public java.sql.Connection getConnection() throws SQLException
	{
		return (java.sql.Connection)connection;
	}

	/* I don't find these in the spec!?! */

	public boolean rowChangesAreDetected(int type) throws SQLException
	{
		return false;
	}

	public boolean rowChangesAreVisible(int type) throws SQLException
	{
		return false;
	}
}
