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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)2002-2004, 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.ant;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.dbunit.Assertion;
import org.dbunit.DatabaseUnitException;
import org.dbunit.database.IDatabaseConnection;
import org.dbunit.dataset.IDataSet;
import org.dbunit.dataset.ITable;
import org.dbunit.dataset.NoSuchTableException;
import org.dbunit.dataset.SortedTable;
import org.dbunit.dataset.ITableMetaData;
import org.dbunit.dataset.filter.DefaultColumnFilter;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

/**
 * The Compare class is the step that compare the content of the
 * database against the specified dataset.
 *
 * @author Manuel Laflamme
 * @version $Revision: 838 $
 * @since Apr 3, 2004
 * @see DbUnitTaskStep
 */
public class Compare extends AbstractStep
{

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

    private static final String DEFAULT_FORMAT = FORMAT_FLAT;

    private String _format;
    private File _src;
    private List _tables = new ArrayList();
    private boolean _sort = false;

    public File getSrc()
    {
        return _src;
    }

    public void setSrc(File src)
    {
        logger.debug("setSrc(src={}) - start", src);

        _src = src;
    }

    public void setSort(boolean sort)
    {
        logger.debug("setSort(sort={}) - start", String.valueOf(sort));

        _sort = sort;
    }

    public String getFormat()
    {
        return _format != null ? _format : DEFAULT_FORMAT;
    }

    public void setFormat(String format)
    {
        logger.debug("setFormat(format={}) - start", format);

        // Check if the given format is accepted
        checkDataFormat(format);
        // If we get here the given format is a valid data format
        _format = format;
    }

    public List getTables()
    {
        return _tables;
    }

    public void addTable(Table table)
    {
        logger.debug("addTable(table={}) - start", table);

        _tables.add(table);
    }

    public void addQuery(Query query)
    {
        logger.debug("addQuery(query={}) - start", query);

        _tables.add(query);
    }

    public void execute(IDatabaseConnection connection) throws DatabaseUnitException
    {
        logger.debug("execute(connection={}) - start", connection);

        IDataSet expectedDataset = getSrcDataSet(_src, getFormat(), false);
        IDataSet actualDataset = getDatabaseDataSet(connection, _tables, false);

        String[] tableNames = null;
        if (_tables.size() == 0)
        {
            // No tables specified, assume must compare all tables from
            // expected dataset
            tableNames = expectedDataset.getTableNames();
        }
        else
        {
            tableNames = actualDataset.getTableNames();
        }

        for (int i = 0; i < tableNames.length; i++)
        {
            String tableName = tableNames[i];
            ITable expectedTable;
			try {
				expectedTable = expectedDataset.getTable(tableName);
			} catch (NoSuchTableException e) {
				throw new DatabaseUnitException("Did not find table in source file '" + 
						_src + "' using format '" + getFormat() + "'", e);
			}
            ITableMetaData expectedMetaData = expectedTable.getTableMetaData();

            ITable actualTable;
			try {
				actualTable = actualDataset.getTable(tableName);
			} catch (NoSuchTableException e) {
				throw new DatabaseUnitException("Did not find table in actual dataset '" + 
						actualDataset + "' via db connection '" + connection + "'", e);
			}
            // Only compare columns present in expected table. Extra columns
            // are filtered out from actual database table.
            actualTable = DefaultColumnFilter.includedColumnsTable(
                    actualTable, expectedMetaData.getColumns());

            if (_sort)
            {
                expectedTable = new SortedTable(expectedTable);
                actualTable = new SortedTable(actualTable);
            }
            Assertion.assertEquals(expectedTable, actualTable);
        }
    }

    public String getLogMessage()
    {
        return "Executing compare: "
                + "\n          from file: " + ((_src == null) ? null : _src.getAbsolutePath())
                + "\n          with format: " + _format;
    }

    public String toString()
    {
        StringBuffer result = new StringBuffer();
        result.append("Compare: ");
        result.append(" src=");
        result.append((_src == null ? "null" : _src.getAbsolutePath()));
        result.append(", format= ");
        result.append(_format);
        result.append(", tables= ");
        result.append(_tables);

        return result.toString();
    }
}