Spring Transaction 一: 基本概念

1. 两个重要的接口
TransactionDefinition 和 TransactionStatus

TransactionDefinition

import org.springframework.transaction.TransactionDefinition;
public interface TransactionDefinition{
        int ISOLATION_DEFAULT = -1;
        int ISOLATION_READ_UNCOMMITTED = Connection.TRANSACTION_READ_UNCOMMITTED;
        .............隔离级别值
        int PROPAGATION_REQUIRED = 0;
        int PROPAGATION_SUPPORTS = 1;
        ...............事务传播级别
	int getPropagationBehavior(); //事务传播级别，当一个新事务到达时, spring 所要做的事情
        int getIsolationLevel();  //事务隔离级别
        int getTimeout();  //事务完成的时间限制
        boolean isReadOnly();  //事务是否只读
}

TransactionStatus

import org.springframework.transaction.TransactionStatus;

public interface TransactionStatus{
	boolean isNewTransaction();
        void setRollbackOnly(); //调用次函数后，事务只能回滚，不可提交
        boolean isRollbackOnly();
}

2. PlatformTransactionManager 创建并管理事务， 该接口的实现必须对事务管理器有深入的理解

实现PlatformTransactionManager接口的几个类

org.springframework.jdbc.datasource.DataSouceTransationManager 控制这从datasource中获得的JDBC CONNECTION上的事务的执行

org.springframework.orm.hibernate3.HibernateTransactionManager 控制着HIBERNATE SESSIONshang  事务的执行

JtaTransactionManager 多个数据源时管理事务

JdoTransactionManager?

PlatformTransactionManager接口

package org.springframework.transaction;

public interface PlatformTransactionManager {

	TransactionStatus getTransaction(TransactionDefinition definition) throws TransactionException;

	
	void commit(TransactionStatus status) throws TransactionException;

	
	void rollback(TransactionStatus status) throws TransactionException;

}