de.iritgo.aktario.jdbc.GetDatabaseVersion.java Source code

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Here is the source code for de.iritgo.aktario.jdbc.GetDatabaseVersion.java

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/**
 * This file is part of the Iritgo/Aktario Framework.
 *
 * Copyright (C) 2005-2011 Iritgo Technologies.
 * Copyright (C) 2003-2005 BueroByte GbR.
 *
 * Iritgo licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package de.iritgo.aktario.jdbc;

import de.iritgo.aktario.core.Engine;
import de.iritgo.aktario.core.command.Command;
import de.iritgo.aktario.core.logger.Log;
import org.apache.commons.dbutils.DbUtils;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;

/**
 * Get the name and version of the database.
 *
 * <table>
 *   <tr><th>Parameter</th><th>Type</th><th>Description</th></tr>
 * </table>
 */
public class GetDatabaseVersion extends Command {
    /** The chached version. */
    String version;

    /**
     * Create a new <code>GetDatabaseVersion</code> command.
     */
    public GetDatabaseVersion() {
        super("persist.GetDatabaseVersion");
    }

    /**
     * Perform the command.
     *
     * @return The database name and version.
     */
    public Object performWithResult() {
        JDBCManager jdbcManager = (JDBCManager) Engine.instance().getManager("persist.JDBCManager");
        DataSource dataSource = jdbcManager.getDefaultDataSource();

        Connection connection = null;

        try {
            if (version == null) {
                connection = dataSource.getConnection();

                DatabaseMetaData meta = connection.getMetaData();

                version = meta.getDatabaseProductName() + " " + meta.getDatabaseProductVersion();
            }

            return version;
        } catch (SQLException x) {
            Log.logError("persist", "Insert", "Unable to get database meta data: " + x);
        } finally {
            DbUtils.closeQuietly(connection);
        }

        return null;
    }
}