Java tutorial
/* This file is part of Subsonic. Subsonic 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, either version 3 of the License, or (at your option) any later version. Subsonic 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 Subsonic. If not, see <http://www.gnu.org/licenses/>. Copyright 2009 (C) Sindre Mehus */ package net.sourceforge.subsonic.dao.schema.hsql; import net.sourceforge.subsonic.Logger; import net.sourceforge.subsonic.dao.schema.Schema; import org.springframework.jdbc.core.JdbcTemplate; /** * Used for creating and evolving the database schema. * This class implements the database schema for Subsonic version 3.8. * * @author Sindre Mehus */ public class Schema38 extends Schema { private static final Logger LOG = Logger.getLogger(Schema38.class); @Override public void execute(JdbcTemplate template) { if (template.queryForInt("select count(*) from version where version = 14") == 0) { LOG.info("Updating database schema to version 14."); template.execute("insert into version values (14)"); } if (!columnExists(template, "client_id", "player")) { LOG.info("Database column 'player.client_id' not found. Creating it."); template.execute("alter table player add client_id varchar"); LOG.info("Database column 'player.client_id' was added successfully."); } if (!columnExists(template, "show_chat", "user_settings")) { LOG.info("Database column 'user_settings.show_chat' not found. Creating it."); template.execute("alter table user_settings add show_chat boolean default true not null"); LOG.info("Database column 'user_settings.show_chat' was added successfully."); } } }