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

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

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

/**
 * @author Manuel Laflamme
 * @version $Revision$
 * @since Feb 17, 2002
 */
public class ScrollableResultSetTable extends AbstractResultSetTable
{

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

    private final int _rowCount;

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

        try
        {
            if (_resultSet.getType() == ResultSet.TYPE_FORWARD_ONLY)
            {
                throw new SQLException("Forward only ResultSet not supported");
            }

            _resultSet.last();
            _rowCount = _resultSet.getRow();
        }
        catch (SQLException e)
        {
            close();
            throw e;
        }
    }

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

        try
        {
            if (_resultSet.getType() == ResultSet.TYPE_FORWARD_ONLY)
            {
                throw new SQLException("Forward only ResultSet not supported");
            }

            _resultSet.last();
            _rowCount = _resultSet.getRow();
        }
        catch (SQLException e)
        {
            close();
            throw e;
        }
    }

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

        try
        {
            if (_resultSet.getType() == ResultSet.TYPE_FORWARD_ONLY)
            {
                throw new SQLException("Forward only ResultSet not supported");
            }

            _resultSet.last();
            _rowCount = _resultSet.getRow();
        }
        catch (SQLException e)
        {
            close();
            throw e;
        }
    }

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

    public int getRowCount()
    {
        return _rowCount;
    }

    public Object getValue(int row, String columnName) throws DataSetException
    {
        if(logger.isDebugEnabled())
            logger.debug("getValue(row={}, columnName={}) - start", Integer.toString(row), columnName);

        assertValidRowIndex(row);

        try
        {
            _resultSet.absolute(row + 1);

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

    /**
     * {@inheritDoc}
     */
    public String toString()
    {
        StringBuilder sb = new StringBuilder(2000);

        sb.append(super.toString());
        sb.append(", ");
        sb.append(getClass().getName()).append("[");
        sb.append("_rowCount=[").append(_rowCount).append("]");
        sb.append("]");

        return sb.toString();
    }
}