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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 java.util.ArrayList;
import java.util.BitSet;
import java.util.List;

import org.dbunit.database.IDatabaseConnection;
import org.dbunit.dataset.Column;
import org.dbunit.dataset.Columns;
import org.dbunit.dataset.DataSetException;
import org.dbunit.dataset.ITableMetaData;
import org.dbunit.dataset.NoPrimaryKeyException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Updates the database from the dataset contents. This operation assumes that
 * table data already exists in the database and fails if this is not the case.

 * @author Manuel Laflamme
 * @version $Revision$
 * @since Feb 19, 2002
 */
public class UpdateOperation extends AbstractBatchOperation
{

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

    UpdateOperation()
    {
    }

    ////////////////////////////////////////////////////////////////////////////
    // AbstractBatchOperation class

    public OperationData getOperationData(ITableMetaData metaData, BitSet ignoreMapping, IDatabaseConnection connection) throws DataSetException
    {
        if(logger.isDebugEnabled())
            logger.debug("getOperationData(metaData={}, ignoreMapping={}, connection={}) - start", 
                new Object[]{metaData, ignoreMapping, connection});

        Column[] columns = metaData.getColumns();
        Column[] primaryKeys = metaData.getPrimaryKeys();

        // cannot construct where clause if no primary key
        if (primaryKeys.length == 0)
        {
            throw new NoPrimaryKeyException(metaData.getTableName());
        }

        // update table
        StringBuffer sqlBuffer = new StringBuffer(128);
        sqlBuffer.append("update ");
        sqlBuffer.append(getQualifiedName(connection.getSchema(),
                metaData.getTableName(), connection));

        // set
        boolean firstSet = true;
        List columnList = new ArrayList(columns.length);
        sqlBuffer.append(" set ");
        for (int i = 0; i < columns.length; i++)
        {
            Column column = columns[i];

            // set if not primary key
            if (Columns.getColumn(column.getColumnName(), primaryKeys) == null)
            {
                if (!firstSet)
                {
                    sqlBuffer.append(", ");
                }
                firstSet = false;

                // escape column name
                String columnName = getQualifiedName(null,
                        column.getColumnName(), connection);
                sqlBuffer.append(columnName);
                sqlBuffer.append(" = ?");
                columnList.add(column);
            }
        }

        // where
        sqlBuffer.append(" where ");
        for (int i = 0; i < primaryKeys.length; i++)
        {
            Column column = primaryKeys[i];

            if (i > 0)
            {
                sqlBuffer.append(" and ");
            }

            // escape column name
            String columnName = getQualifiedName(null,
                    column.getColumnName(), connection);
            sqlBuffer.append(columnName);
            sqlBuffer.append(" = ?");
            columnList.add(column);
        }

        return new OperationData(sqlBuffer.toString(),
                (Column[])columnList.toArray(new Column[0]));
    }

}