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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.database;

import org.dbunit.dataset.Column;
import org.dbunit.dataset.DataSetException;
import org.dbunit.dataset.ITableMetaData;
import org.dbunit.dataset.RowOutOfBoundsException;

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

/**
 * @author Manuel Laflamme
 * @since Apr 10, 2003
 * @version $Revision: 398 $
 */
public class ForwardOnlyResultSetTable extends AbstractResultSetTable
{
    private int _lastRow = -1;
    private boolean _eot = false;   // End of table flag

    public ForwardOnlyResultSetTable(ITableMetaData metaData,
            ResultSet resultSet) throws SQLException, DataSetException
    {
        super(metaData, resultSet);
    }

    public ForwardOnlyResultSetTable(ITableMetaData metaData,
            IDatabaseConnection connection) throws DataSetException, SQLException
    {
        super(metaData, connection);
    }

    public ForwardOnlyResultSetTable(String tableName, String selectStatement,
            IDatabaseConnection connection) throws DataSetException, SQLException
    {
        super(tableName, selectStatement, connection);
    }

    ////////////////////////////////////////////////////////////////////////////
    // ITable interface

    public int getRowCount()
    {
        throw new UnsupportedOperationException();
    }

    public Object getValue(int row, String columnName) throws DataSetException
    {
        try
        {
            // Move cursor forward up to specified row
            while (!_eot && row > _lastRow)
            {
                _eot = !_resultSet.next();
                _lastRow++;
            }

            if (row < _lastRow)
            {
                throw new UnsupportedOperationException("Cannot go backward!");
            }

            if (_eot || row > _lastRow)
            {
                // Proactively close the resultset
                close();
                throw new RowOutOfBoundsException(row + " > " + _lastRow);
            }

            int columnIndex = getColumnIndex(columnName);
            Column column = _metaData.getColumns()[columnIndex];
            return column.getDataType().getSqlValue(columnIndex + 1, _resultSet);
        }
        catch (SQLException e)
        {
            throw new DataSetException(e);
        }
    }
}