Java 事务管理

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从代码出发, 分析Java的事务管理发展

一、JDBC事务

Connection conn =     DataSourceUtils.getConnection(); //开启事务conn.setAutoCommit(false);try {    Object retVal =         callback.doInConnection(conn);    conn.commit(); //提交事务    return retVal;}catch (Exception e) {    conn.rollback();//回滚事务    throw e;}finally {    conn.close();}

二、Hibernate事务

Session session = null;Transaction transaction = null;try {    session = factory.openSession();    //开启事务    transaction = session.beginTransaction();    transation.begin();    session.save(user);    transaction.commit();//提交事务} catch (Exception e) {    e.printStackTrace();    transaction.rollback();//回滚事务    return false;}finally{    session.close();}

三、Spring JDBC事务

[A]

public interface PlatformTransactionManager {    TransactionStatus getTransaction(TransactionDefinition definition)        throws TransactionException;    void commit(TransactionStatus status) throws TransactionException;    void rollback(TransactionStatus status) throws TransactionException;}

        //1.获取事务管理器        PlatformTransactionManager txManager = (PlatformTransactionManager)                          ctx.getBean("txManager");        //2.定义事务属性        DefaultTransactionDefinition td = new DefaultTransactionDefinition();        td.setIsolationLevel(TransactionDefinition.ISOLATION_READ_COMMITTED);        //3开启事务,得到事务状态        TransactionStatus status = txManager.getTransaction(td);        try {            //4.执行数据库操作            System.out.println(jdbcTempate.queryForInt("select count(*) from tbl_doc"));            //5、提交事务            txManager.commit(status);                    }catch (Exception e) {            //6、回滚事务            txManager.rollback(status);        }

});

[B]

//1.获取事务管理器PlatformTransactionManager txManager = (PlatformTransactionManager)        ctx.getBean("txManager");        //2、定义事务管理的模板TransactionTemplate transactionTemplate = new TransactionTemplate(txManager);//3.定义事务属性transactionTemplate.    setIsolationLevel(TransactionDefinition.ISOLATION_READ_COMMITTED);//4.回调，执行真正的数据库操作，如果需要返回值需要在回调里返回transactionTemplate.execute(new TransactionCallback() {    @Override    public Object doInTransaction(TransactionStatus status) {    //5.执行数据库操作    System.out.println(jdbcTempate.queryForInt("select count(*) from tbl_doc"));    return null;    }});

四、AOP

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