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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.operation;

import org.dbunit.DatabaseUnitException;
import org.dbunit.database.DatabaseConfig;
import org.dbunit.database.IDatabaseConnection;
import org.dbunit.dataset.IDataSet;

import java.sql.SQLException;

/**
 * Truncate tables present in the specified dataset. If the dataset does not
 * contains a particular table, but that table exists in the database,
 * the database table is not affected. Table are truncated in
 * reverse sequence.
 * 
 * This operation has the same effect of as {@link DeleteAllOperation}.
 * TruncateTableOperation is faster, and it is non-logged, meaning it cannot be
 * rollback. DeleteAllOperation is more portable because not all database vendor
 * support TRUNCATE_TABLE TABLE statement.
 *
 * @author Manuel Laflamme
 * @since Apr 10, 2003
 * @version $Revision: 398 $
 * @see DeleteAllOperation
 */
public class TruncateTableOperation extends DeleteAllOperation
{
    TruncateTableOperation()
    {
    }

    ////////////////////////////////////////////////////////////////////////////
    // DeleteAllOperation class

    protected String getDeleteAllCommand()
    {
        return "truncate table ";
    }

    ////////////////////////////////////////////////////////////////////////////
    // DatabaseOperation class

    public void execute(IDatabaseConnection connection, IDataSet dataSet)
            throws DatabaseUnitException, SQLException
    {
        // Patch to make it work with MS SQL Server
        DatabaseConfig config = connection.getConfig();
        boolean oldValue = config.getFeature(DatabaseConfig.FEATURE_BATCHED_STATEMENTS);
        try
        {
            config.setFeature(DatabaseConfig.FEATURE_BATCHED_STATEMENTS, false);
            super.execute(connection, dataSet);
        }
        finally
        {
            config.setFeature(DatabaseConfig.FEATURE_BATCHED_STATEMENTS, oldValue);
        }
    }
}