localsessionfactorybean.java

spring的源代码

			}
		}

		// Execute schema update if requested.
		if (this.schemaUpdate) {
			updateDatabaseSchema();
		}
	}
	

	/**
	 * Subclasses can override this method to perform custom initialization
	 * of the Configuration instance used for SessionFactory creation.
	 * The properties of this LocalSessionFactoryBean will be applied to
	 * the Configuration object that gets returned here.
	 * <p>The default implementation creates a new Configuration instance.
	 * A custom implementation could prepare the instance in a specific way,
	 * or use a custom Configuration subclass.
	 * @return the Configuration instance
	 * @throws HibernateException in case of Hibernate initialization errors
	 * @see net.sf.hibernate.cfg.Configuration#Configuration()
	 */
	protected Configuration newConfiguration() throws HibernateException {
		return new Configuration();
	}

	/**
	 * To be implemented by subclasses that want to to perform custom
	 * post-processing of the Configuration object after this FactoryBean
	 * performed its default initialization.
	 * @param config the current Configuration object
	 * @throws HibernateException in case of Hibernate initialization errors
	 */
	protected void postProcessConfiguration(Configuration config) throws HibernateException {
	}

	/**
	 * Subclasses can override this method to perform custom initialization
	 * of the SessionFactory instance, creating it via the given Configuration
	 * object that got prepared by this LocalSessionFactoryBean.
	 * <p>The default implementation invokes Configuration's buildSessionFactory.
	 * A custom implementation could prepare the instance in a specific way,
	 * or use a custom SessionFactoryImpl subclass.
	 * @param config Configuration prepared by this LocalSessionFactoryBean
	 * @return the SessionFactory instance
	 * @throws HibernateException in case of Hibernate initialization errors
	 * @see net.sf.hibernate.cfg.Configuration#buildSessionFactory
	 */
	protected SessionFactory newSessionFactory(Configuration config) throws HibernateException {
		return config.buildSessionFactory();
	}


	/**
	 * Execute schema drop script, determined by the Configuration object
	 * used for creating the SessionFactory. A replacement for Hibernate's
	 * SchemaExport class, to be invoked on application setup.
	 * <p>Fetch the LocalSessionFactoryBean itself rather than the exposed
	 * SessionFactory to be able to invoke this method, e.g. via
	 * <code>LocalSessionFactoryBean lsfb = (LocalSessionFactoryBean) ctx.getBean("&mySessionFactory");</code>.
	 * <p>Uses the SessionFactory that this bean generates for accessing a JDBC
	 * connection to perform the script.
	 * @throws DataAccessException in case of script execution errors
	 * @see net.sf.hibernate.cfg.Configuration#generateDropSchemaScript
	 * @see net.sf.hibernate.tool.hbm2ddl.SchemaExport#drop
	 */
	public void dropDatabaseSchema() throws DataAccessException {
		logger.info("Dropping database schema for Hibernate SessionFactory");
		HibernateTemplate hibernateTemplate = new HibernateTemplate(this.sessionFactory);
		hibernateTemplate.execute(
			new HibernateCallback() {
				public Object doInHibernate(Session session) throws HibernateException, SQLException {
					Connection con = session.connection();
					Dialect dialect = Dialect.getDialect(configuration.getProperties());
					String[] sql = configuration.generateDropSchemaScript(dialect);
					executeSchemaScript(con, sql);
					return null;
				}
			}
		);
	}

	/**
	 * Execute schema creation script, determined by the Configuration object
	 * used for creating the SessionFactory. A replacement for Hibernate's
	 * SchemaExport class, to be invoked on application setup.
	 * <p>Fetch the LocalSessionFactoryBean itself rather than the exposed
	 * SessionFactory to be able to invoke this method, e.g. via
	 * <code>LocalSessionFactoryBean lsfb = (LocalSessionFactoryBean) ctx.getBean("&mySessionFactory");</code>.
	 * <p>Uses the SessionFactory that this bean generates for accessing a JDBC
	 * connection to perform the script.
	 * @throws DataAccessException in case of script execution errors
	 * @see net.sf.hibernate.cfg.Configuration#generateSchemaCreationScript
	 * @see net.sf.hibernate.tool.hbm2ddl.SchemaExport#create
	 */
	public void createDatabaseSchema() throws DataAccessException {
		logger.info("Creating database schema for Hibernate SessionFactory");
		HibernateTemplate hibernateTemplate = new HibernateTemplate(this.sessionFactory);
		hibernateTemplate.execute(
			new HibernateCallback() {
				public Object doInHibernate(Session session) throws HibernateException, SQLException {
					Connection con = session.connection();
					final Dialect dialect = Dialect.getDialect(configuration.getProperties());
					String[] sql = configuration.generateSchemaCreationScript(dialect);
					executeSchemaScript(con, sql);
					return null;
				}
			}
		);
	}

	/**
	 * Execute schema update script, determined by the Configuration object
	 * used for creating the SessionFactory. A replacement for Hibernate's
	 * SchemaUpdate class, for automatically executing schema update scripts
	 * on application startup. Can also be invoked manually.
	 * <p>Fetch the LocalSessionFactoryBean itself rather than the exposed
	 * SessionFactory to be able to invoke this method, e.g. via
	 * <code>LocalSessionFactoryBean lsfb = (LocalSessionFactoryBean) ctx.getBean("&mySessionFactory");</code>.
	 * <p>Uses the SessionFactory that this bean generates for accessing a JDBC
	 * connection to perform the script.
	 * @throws HibernateException in case of Hibernate initialization errors
	 * @see #setSchemaUpdate
	 * @see net.sf.hibernate.cfg.Configuration#generateSchemaUpdateScript
	 * @see net.sf.hibernate.tool.hbm2ddl.SchemaUpdate
	 */
	public void updateDatabaseSchema() throws HibernateException {
		logger.info("Updating database schema for Hibernate SessionFactory");
		HibernateTemplate hibernateTemplate = new HibernateTemplate(this.sessionFactory);
		hibernateTemplate.setFlushMode(HibernateTemplate.FLUSH_NEVER);
		hibernateTemplate.execute(
			new HibernateCallback() {
				public Object doInHibernate(Session session) throws HibernateException, SQLException {
					Connection con = session.connection();
					final Dialect dialect = Dialect.getDialect(configuration.getProperties());
					DatabaseMetadata metadata = new DatabaseMetadata(con, dialect);
					String[] sql = configuration.generateSchemaUpdateScript(dialect, metadata);
					executeSchemaScript(con, sql);
					return null;
				}
			}
		);
	}

	/**
	 * Execute the given schema script on the given JDBC Connection.
	 * <p>Note that the default implementation will log unsuccessful statements
	 * and continue to execute. Override the <code>executeSchemaStatement</code>
	 * method to treat failures differently.
	 * @param con the JDBC Connection to execute the script on
	 * @param sql the SQL statements to execute
	 * @throws SQLException if thrown by JDBC methods
	 * @see #executeSchemaStatement
	 */
	protected void executeSchemaScript(Connection con, String[] sql) throws SQLException {
		if (sql != null && sql.length > 0) {
			boolean oldAutoCommit = con.getAutoCommit();
			if (!oldAutoCommit) {
				con.setAutoCommit(true);
			}
			try {
				Statement stmt = con.createStatement();
				try {
					for (int i = 0; i < sql.length; i++) {
						executeSchemaStatement(stmt, sql[i]);
					}
				}
				finally {
					JdbcUtils.closeStatement(stmt);
				}
			}
			finally {
				if (!oldAutoCommit) {
					con.setAutoCommit(false);
				}
			}
		}
	}

	/**
	 * Execute the given schema SQL on the given JDBC Statement.
	 * <p>Note that the default implementation will log unsuccessful statements
	 * and continue to execute. Override this method to treat failures differently.
	 * @param stmt the JDBC Statement to execute the SQL on
	 * @param sql the SQL statement to execute
	 * @throws SQLException if thrown by JDBC methods (and considered fatal)
	 */
	protected void executeSchemaStatement(Statement stmt, String sql) throws SQLException {
		if (logger.isDebugEnabled()) {
			logger.debug("Executing schema statement: " + sql);
		}
		try {
			stmt.executeUpdate(sql);
		}
		catch (SQLException ex) {
			if (logger.isWarnEnabled()) {
				logger.warn("Unsuccessful schema statement: " + sql, ex);
			}
		}
	}


	/**
	 * Return the Configuration object used to build the SessionFactory.
	 * Allows access to configuration metadata stored there (rarely needed).
	 */
	public Configuration getConfiguration() {
		return configuration;
	}


	/**
	 * Return the singleton SessionFactory.
	 */
	public Object getObject() {
		return this.sessionFactory;
	}

	public Class getObjectType() {
		return (this.sessionFactory != null) ? this.sessionFactory.getClass() : SessionFactory.class;
	}

	public boolean isSingleton() {
		return true;
	}


	/**
	 * Close the SessionFactory on bean factory shutdown.
	 */
	public void destroy() throws HibernateException {
		logger.info("Closing Hibernate SessionFactory");
		if (this.dataSource != null) {
			// Make given DataSource available for potential SchemaExport,
			// which unfortunately reinstantiates a ConnectionProvider.
			configTimeDataSourceHolder.set(this.dataSource);
		}
		try {
			this.sessionFactory.close();
		}
		finally {
			if (this.dataSource != null) {
				// Reset DataSource holder.
				configTimeDataSourceHolder.set(null);
			}
		}
	}

}