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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.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import org.dbunit.DatabaseUnitException;
import org.dbunit.database.DatabaseConfig;
import org.dbunit.database.IDatabaseConnection;
import org.dbunit.dataset.Column;
import org.dbunit.dataset.DefaultTableMetaData;
import org.dbunit.dataset.IDataSet;
import org.dbunit.dataset.ITableMetaData;
import org.dbunit.util.QualifiedTableName;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Manuel Laflamme
 * @since Jan 17, 2004
 * @version $Revision: 778 $
 */
public abstract class AbstractOperation extends DatabaseOperation
{

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

    protected String getQualifiedName(String prefix, String name, IDatabaseConnection connection)
    {
    	if (logger.isDebugEnabled())	
    	{
    		logger.debug("getQualifiedName(prefix={}, name={}, connection={}) - start",
    				new Object[] {prefix, name, connection});
    	}

        String escapePattern = (String)connection.getConfig().getProperty(DatabaseConfig.PROPERTY_ESCAPE_PATTERN);
        QualifiedTableName qualifiedTbleName = new QualifiedTableName(name, prefix, escapePattern);
        return qualifiedTbleName.getQualifiedName();
    }

    /**
     * Returns the metadata to use in this operation. It is retrieved
     * from the database connection using the information from the physical
     * database table.
     *
     * @param connection the database connection
     * @param metaData the XML table metadata
     */
    static ITableMetaData getOperationMetaData(IDatabaseConnection connection,
            ITableMetaData metaData) throws DatabaseUnitException, SQLException
    {
        logger.debug("getOperationMetaData(connection={}, metaData={}) - start", connection, metaData);

        IDataSet databaseDataSet = connection.createDataSet();
        String tableName = metaData.getTableName();

        ITableMetaData databaseMetaData = databaseDataSet.getTableMetaData(tableName);
        Column[] columns = metaData.getColumns();

        List columnList = new ArrayList();
        for (int j = 0; j < columns.length; j++)
        {
            String columnName = columns[j].getColumnName();
        	// Check if column exists in database
            // method "getColumnIndex()" throws NoSuchColumnsException when columns have not been found
        	int dbColIndex = databaseMetaData.getColumnIndex(columnName);
        	// If we get here the column exists in the database
        	Column dbColumn = databaseMetaData.getColumns()[dbColIndex];
            columnList.add(dbColumn);
        }

        return new DefaultTableMetaData(databaseMetaData.getTableName(),
                (Column[])columnList.toArray(new Column[0]),
                databaseMetaData.getPrimaryKeys());
    }
}