org.arsenico.database.HibernateUtil.java Source code

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Here is the source code for org.arsenico.database.HibernateUtil.java

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package org.arsenico.database;

/*
 * Copyright 2001-2005 The Apache Software Foundation.
 *
 * Licensed 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.
 */

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.arsenico.core.DatabaseSupportedType;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.jdbc.Work;

/**
 * Classe di utilit per la creazione di sessioni hibernate.
 * 
 * 
 * @author Francesco Benincasa
 *
 */
public class HibernateUtil {

    /**
     * session factory
     */
    private static SessionFactory sessionFactory;

    /**
     * A partire dai parametri passati, crea una session factory
     * 
     * @param url
     * @param username
     * @param password
     * @param createTables
     *       se true mette il parametro <code>hbm2ddl.auto</code> a <code>create</code>, altrimenti a <code>verify</code>
     * @param type 
     *       tipo di database   
     * @return
     *       sessionFactory
     * @throws Exception
     * 
     * @see {@link DatabaseSupportedType}
     */
    public static SessionFactory createSessionFactory(String url, String username, String password,
            boolean createTables, DatabaseSupportedType type) throws Exception {
        Configuration config = new Configuration();

        config.addClass(LogRegistry.class);
        //
        config.setProperty("hibernate.connection.url", url);
        config.setProperty("hibernate.connection.driver_class", type.getDriver());
        config.setProperty("hibernate.connection.username", username);

        password = (password == null) ? "" : password;
        config.setProperty("hibernate.connection.password", password);
        config.setProperty("hibernate.connection.pool_size", "1");
        config.setProperty("hibernate.cache.provider_class", "org.hibernate.cache.NoCacheProvider");
        // config.setProperty("hibernate.show_sql", "true");
        config.setProperty("hibernate.show_sql", "false");

        // creiamo le tabella in base al flag dato come parametro
        if (createTables)
            config.setProperty("hibernate.hbm2ddl.auto", "create");
        else
            config.setProperty("hibernate.hbm2ddl.auto", "verify");
        config.setProperty("hibernate.connection.pool_size", "1");
        config.setProperty("hibernate.dialect", type.getDialect());

        sessionFactory = config.buildSessionFactory();

        return sessionFactory;
    }

    /**
     * Classe di utilit  per il metodo {@link #tableExist}
     * @author Francesco Benincasa
     *
     */
    public static class TableCheck {
        /**
         * indica se la tabella esiste
         */
        private boolean tableExist;

        /**
         * getter
         * @return
         */
        public boolean isTableExist() {
            return tableExist;
        }

        /**
         * setter
         * @param tableExist
         */
        public void setTableExist(boolean tableExist) {
            this.tableExist = tableExist;
        }
    }

    /**
     * indica se la tabella passata come argomento esiste sul db su cui  aperta la sessione
     * @param session
     *       sessione
     * @param tableName
     *       tabella da verificare
     * @return
     *       true se la tabella esiste.
     * @throws HibernateException
     * @throws SQLException
     */
    public static boolean tableExists(final Session session, final String tableName)
            throws HibernateException, SQLException {
        final TableCheck result = new TableCheck();
        session.doWork(new Work() {

            public void execute(Connection connection) throws SQLException {
                if (connection != null) {
                    ResultSet tables = connection.getMetaData().getTables(null, null, tableName, null);
                    while (tables.next()) {
                        String currentTableName = tables.getString("TABLE_NAME");
                        if (currentTableName.equals(tableName)) {
                            result.setTableExist(true);
                        }
                    }
                    tables.close();
                }

            }
        });

        return result.isTableExist();
    }

}