Java tutorial
/* * SonarQube * Copyright (C) 2009-2016 SonarSource SA * mailto:contact AT sonarsource DOT com * * This program 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 3 of the License, or (at your option) any later version. * * 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser 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.sonar.db.version; import java.sql.Connection; import java.sql.SQLException; import org.apache.commons.dbutils.DbUtils; import org.sonar.db.Database; public abstract class BaseDataChange implements DataChange, MigrationStep { private final Database db; public BaseDataChange(Database db) { this.db = db; } @Override public final void execute() throws SQLException { Connection readConnection = null; Connection writeConnection = null; try { readConnection = openConnection(); writeConnection = db.getDataSource().getConnection(); writeConnection.setAutoCommit(false); Context context = new Context(db, readConnection, writeConnection); execute(context); } finally { DbUtils.closeQuietly(readConnection); DbUtils.closeQuietly(writeConnection); } } /** * Do not forget to close it ! */ protected Connection openConnection() throws SQLException { Connection connection = db.getDataSource().getConnection(); connection.setAutoCommit(false); if (connection.getMetaData().supportsTransactionIsolationLevel(Connection.TRANSACTION_READ_UNCOMMITTED)) { connection.setTransactionIsolation(Connection.TRANSACTION_READ_UNCOMMITTED); } return connection; } }