/*
* RHQ Management Platform
* Copyright (C) 2005-2014 Red Hat, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation version 2 of the License.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
package org.rhq.server.metrics.migrator.datasources;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.persistence.EntityManager;
import org.hibernate.Session;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.service.jdbc.connections.spi.ConnectionProvider;
import org.rhq.core.util.jdbc.JDBCUtil;
import org.rhq.core.util.stream.StreamUtil;
/**
* @author Thomas Segismont
*/
public class ExistingDataJPABulkExportSource extends ExistingDataBulkExportSource {
private EntityManager entityManager;
private String selectNativeQuery;
public ExistingDataJPABulkExportSource(EntityManager entityManager, String selectNativeQuery) {
super();
}
protected void exportExistingData() throws Exception {
BufferedWriter fileWriter = null;
Connection connection = null;
PreparedStatement statement = null;
ResultSet resultSet = null;
try {
fileWriter = new BufferedWriter(new FileWriter(getExistingDataFile()), IO_BUFFER_SIZE);
Session session = (Session) this.entityManager.getDelegate();
SessionFactoryImplementor sfi = (SessionFactoryImplementor) session.getSessionFactory();
ConnectionProvider cp = sfi.getConnectionProvider();
connection = cp.getConnection();
statement = connection.prepareStatement(this.selectNativeQuery);
resultSet = statement.executeQuery();
int columnCount = resultSet.getMetaData().getColumnCount();
while (resultSet.next()) {
for (int i = 1; i < columnCount + 1; i++) {
if (i > 1) {
fileWriter.write(DELIMITER);
}
fileWriter.write(resultSet.getString(i));
}
fileWriter.write("\n");
}
} finally {
StreamUtil.safeClose(fileWriter);
JDBCUtil.safeClose(connection, statement, resultSet);
}
}
}