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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.statement;

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

import org.dbunit.dataset.ITable;
import org.dbunit.dataset.datatype.DataType;
import org.dbunit.dataset.datatype.TypeCastException;

import java.sql.Connection;
import java.sql.SQLException;

/**
 * @author Manuel Laflamme
 * @version $Revision$
 * @since Mar 16, 2002
 */
public class SimplePreparedStatement extends AbstractPreparedBatchStatement
{

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

    private int _index;
    private int _result;

    public SimplePreparedStatement(String sql, Connection connection)
            throws SQLException
    {
        super(sql, connection);
        _index = 0;
        _result = 0;
    }

    ////////////////////////////////////////////////////////////////////////////
    // IPreparedBatchStatement interface

    public void addValue(Object value, DataType dataType)
            throws TypeCastException, SQLException
    {
    	logger.debug("addValue(value={}, dataType={}) - start", value, dataType);

        // Special NULL handling
        if (value == null || value == ITable.NO_VALUE)
        {
            String sqlTypeName = dataType .getSqlTypeName();
            if (sqlTypeName == null) {
                _statement.setNull(++_index, dataType.getSqlType());
            } else {
                _statement.setNull(++_index, dataType.getSqlType(), sqlTypeName);
            }
            return;
        }

        dataType.setSqlValue(value, ++_index, _statement);
    }

    public void addBatch() throws SQLException
    {
        logger.debug("addBatch() - start");

        boolean result = _statement.execute();
        if (!result)
        {
            _result += _statement.getUpdateCount();
        }
        _index = 0;
    }

    public int executeBatch() throws SQLException
    {
        logger.debug("executeBatch() - start");

        int result = _result;
        clearBatch();
        return result;
    }

    public void clearBatch() throws SQLException
    {
        logger.debug("clearBatch() - start");

        _index = 0;
        _result = 0;
    }

}