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dbUnit is a JUnit extension (also usable from Ant and Maven) targeted for database-driven projects that, among other things, puts your database into a known state between test runs. This is an excellent way to avoid the myriad of problems that can occur when one test case corrupts the database and causes subsequent tests to fail or exacerbate the damage.
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/*
 *
 * The DbUnit Database Testing Framework
 * Copyright (C)2002-2009, DbUnit.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
package org.dbunit.database;

import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.dbunit.util.SQLHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Default implementation of {@link IMetadataHandler} which works for the most databases.
 * @author gommma (gommma AT users.sourceforge.net)
 * @author Last changed by: $Author: gommma $
 * @version $Revision: 979 $ $Date: 2009-03-03 18:39:37 +0100 (mar, 03 mar 2009) $
 * @since 2.4.4
 */
public class DefaultMetadataHandler implements IMetadataHandler {

    /**
     * Logger for this class
     */
    private static final Logger logger = LoggerFactory.getLogger(DefaultMetadataHandler.class);

    public ResultSet getColumns(DatabaseMetaData databaseMetaData, String schemaName, String tableName) 
    throws SQLException 
    {
        if(logger.isTraceEnabled())
            logger.trace("getColumns(databaseMetaData={}, schemaName={}, tableName={}) - start", 
                    new Object[] {databaseMetaData, schemaName, tableName} );
        
        ResultSet resultSet = databaseMetaData.getColumns(
                null, schemaName, tableName, "%");
        return resultSet;
    }

    public boolean matches(ResultSet resultSet,
            String schema, String table, boolean caseSensitive) 
    throws SQLException 
    {
        return matches(resultSet, null, schema, table, null, caseSensitive);
    }

    public boolean matches(ResultSet columnsResultSet, String catalog,
            String schema, String table, String column,
            boolean caseSensitive) throws SQLException 
    {
        if(logger.isTraceEnabled())
            logger.trace("matches(columnsResultSet={}, catalog={}, schema={}," +
            		" table={}, column={}, caseSensitive={}) - start", 
                    new Object[] {columnsResultSet, catalog, schema, 
                            table, column, Boolean.valueOf(caseSensitive)});
        
        String catalogName = columnsResultSet.getString(1);
        String schemaName = columnsResultSet.getString(2);
        String tableName = columnsResultSet.getString(3);
        String columnName = columnsResultSet.getString(4);

        if(logger.isDebugEnabled()){
            logger.debug("Comparing the following values using caseSensitive={} (searched<=>actual): " +
                    "catalog: {}<=>{} schema: {}<=>{} table: {}<=>{} column: {}<=>{}", 
                    new Object[] {
                        Boolean.valueOf(caseSensitive),
                        catalog, catalogName,
                        schema, schemaName,
                        table, tableName,
                        column, columnName
                    });
        }
        
        boolean areEqual = 
                areEqualIgnoreNull(catalog, catalogName, caseSensitive) &&
                areEqualIgnoreNull(schema, schemaName, caseSensitive) &&
                areEqualIgnoreNull(table, tableName, caseSensitive) &&
                areEqualIgnoreNull(column, columnName, caseSensitive);
        return areEqual;
    }

    private boolean areEqualIgnoreNull(String value1, String value2,
            boolean caseSensitive) {
        return SQLHelper.areEqualIgnoreNull(value1, value2, caseSensitive);
    }

    public String getSchema(ResultSet resultSet) throws SQLException {
        if(logger.isTraceEnabled())
            logger.trace("getColumns(resultSet={}) - start", resultSet);

        String schemaName = resultSet.getString(2);
        return schemaName;
    }
    
    public boolean tableExists(DatabaseMetaData metaData, String schemaName, String tableName) 
    throws SQLException 
    {
        if(logger.isTraceEnabled())
            logger.trace("tableExists(metaData={}, schemaName={}, tableName={}) - start", 
                    new Object[] {metaData, schemaName, tableName} );
        
        ResultSet tableRs = metaData.getTables(null, schemaName, tableName, null);
        try 
        {
            return tableRs.next();
        }
        finally
        {
            SQLHelper.close(tableRs);
        }
    }

    public ResultSet getTables(DatabaseMetaData metaData, String schemaName, String[] tableType) 
    throws SQLException
    {
        if(logger.isTraceEnabled())
            logger.trace("getTables(metaData={}, schemaName={}, tableType={}) - start", 
                    new Object[] {metaData, schemaName, tableType} );

        return metaData.getTables(null, schemaName, "%", tableType);
    }

    public ResultSet getPrimaryKeys(DatabaseMetaData metaData, String schemaName, String tableName) 
    throws SQLException
    {
        if(logger.isTraceEnabled())
            logger.trace("getPrimaryKeys(metaData={}, schemaName={}, tableName={}) - start", 
                    new Object[] {metaData, schemaName, tableName} );

        ResultSet resultSet = metaData.getPrimaryKeys(
                null, schemaName, tableName);
        return resultSet;
    }

}