ConnectionReleaseMode 连接何时释放
AFTER_STATEMENT 每条SQL执行完马上释放 AFTER_TRANSACTION 事务结束之后释放 ON_CLOSE session关闭或失去连接之后释放 // $Id: ConnectionReleaseMode.java 8409 2005-10-14 20:28:18Z steveebersole $package org.hibernate;import java.io.Serializable;/** * Defines the various policies by which Hibernate might release its underlying * JDBC connection. * * @author Steve Ebersole */public class ConnectionReleaseMode implements Serializable {/** * Indicates that JDBC connection should be aggressively released after each * SQL statement is executed. In this mode, the application <em>must</em> * explicitly close all iterators and scrollable results. This mode may * only be used with a JTA datasource. */public static final ConnectionReleaseMode AFTER_STATEMENT = new ConnectionReleaseMode( "after_statement" );/** * Indicates that JDBC connections should be released after each transaction * ends (works with both JTA-registered synch and HibernateTransaction API). * This mode may not be used with an application server JTA datasource. * <p/> * This is the default mode starting in 3.1; was previously {@link #ON_CLOSE}. */public static final ConnectionReleaseMode AFTER_TRANSACTION = new ConnectionReleaseMode( "after_transaction" );/** * Indicates that connections should only be released when the Session is explicitly closed * or disconnected; this is the legacy (Hibernate2 and pre-3.1) behavior. */public static final ConnectionReleaseMode ON_CLOSE = new ConnectionReleaseMode( "on_close" );private String name;private ConnectionReleaseMode(String name) {this.name = name;}/** * Override of Object.toString(). Returns the release mode name. * * @return The release mode name. */public String toString() {return name;}/** * Determine the correct ConnectionReleaseMode instance based on the given * name. * * @param modeName The release mode name. * @return The appropriate ConnectionReleaseMode instance * @throws HibernateException Indicates the modeName param did not match any known modes. */public static ConnectionReleaseMode parse(String modeName) throws HibernateException {if ( AFTER_STATEMENT.name.equals( modeName ) ) {return AFTER_STATEMENT;}else if ( AFTER_TRANSACTION.name.equals( modeName ) ) {return AFTER_TRANSACTION;}else if ( ON_CLOSE.name.equals( modeName ) ) {return ON_CLOSE;}throw new HibernateException( "could not determine appropriate connection release mode [" + modeName + "]" );}private Object readResolve() {return parse( name );}}