Spring事务当中propagation="REQUIRED"和PROPAGATION="REQUIRES_NEW"的区别

3.propagation="REQUIRED"和PROPAGATION="REQUIRES_NEW"的区别

（官方）PROPAGATION_REQUIRED--支持当前事务，如果当前没有事务，就新建一个事务。这是最常见的选择。

PROPAGATION_REQUIRES_NEW--新建事务，如果当前存在事务，把当前事务挂起。

马克-to-win：当两个不同的pointcut之间涉及调用方法时，就涉及到事务传播属性。比如上面的方法updateRegister，如果它的属性是PROPAGATION_REQUIRED，则它会和调用它的方法login同属一个事务，如果是REQUIRES_NEW，则在不同的事务。当updateRegister已经提交之后updateRegisterWrong发生错误的时候，如果是REQUIRES_NEW，则updateRegister不会回滚，而如果是REQUIRED，则会回滚。注意下例，我们把两个方法故意放在两个pointcut里。看一下程序把REQUIRED变成REQUIRES_NEW以后的区别。

例 2.3.1

package service;

import java.sql.Types;

import javax.annotation.Resource;

import org.springframework.jdbc.core.JdbcTemplate;

import com.INiutDAO;

import service.interfac.ILoginService;

public class LoginServiceImpl implements ILoginService {

@Resource

private JdbcTemplate jt;

private INiutDAO iNiutDAO;

public void setINiutDAO(INiutDAO iNiutDAO) {

this.iNiutDAO = iNiutDAO;

}

public void login() {

iNiutDAO.daoUpdateRegister(13,1);

System.out.println("successfully update 1");

updateRegisterWrong(19,2);

System.out.println("successfully update 2");

}

public void updateRegisterWrong(int age,int id) {

String sql = "UPDATE register SET age=? WWWWWWW id=?";

Object params[] = new Object[] { new Integer(age),

new Integer(id) };

int type[] = new int[] { Types.INTEGER , Types.INTEGER };

jt.update(sql, params, type);

}

}

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:tx="http://www.springframework.org/schema/tx"

xmlns:aop="http://www.springframework.org/schema/aop"

xmlns:p="http://www.springframework.org/schema/p"

xmlns:context="http://www.springframework.org/schema/context"

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context-3.0.xsd

http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd

http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"

>

<context:component-scan

base-package="com" />

<context:component-scan

base-package="service" />

<bean id="viewResolver"

class="org.springframework.web.servlet.view.UrlBasedViewResolver">

<property name="viewClass"

value="org.springframework.web.servlet.view.JstlView" />

<property name="prefix" value="/" />

<property name="suffix" value=".jsp" />

</bean>

<bean id="NiutDAO" class="com.NiutDAO">

</bean>

<bean id="loginService" class="service.LoginServiceImpl" >

<property name="iNiutDAO">

<ref bean="NiutDAO" />

</property>

</bean>

<tx:advice id="txAdvice" transaction-manager="transactionManager">

<tx:attributes>

<tx:method name="login*" propagation="REQUIRED" />

<tx:method name="daoUpdateRegister" propagation="REQUIRED" />

</tx:attributes>

</tx:advice>

<!-- 配置切面 这种写法也正确"execution(* service.*.*(..))"-->

<aop:config>

<aop:pointcut id="myPointcut" expression="execution(* service.LoginServiceImpl.*(..))" />

<aop:pointcut id="myDaoPointcut" expression="execution(* com.NiutDAO.*(..))" />

<aop:advisor advice-ref="txAdvice" pointcut-ref="myPointcut"/>

<aop:advisor advice-ref="txAdvice" pointcut-ref="myDaoPointcut"/>

</aop:config>

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" >

<property name="driverClassName"

value="com.mysql.jdbc.Driver"></property>

<property name="url"

value="jdbc:mysql://localhost:3306/test"></property>

<property name="username"

value="root"></property>

<property name="password"

value="1234"></property>

</bean>

<bean id="jt" class="org.springframework.jdbc.core.JdbcTemplate">

<constructor-arg ref="dataSource" />

</bean>

<bean id="transactionManager"

class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

<property name="dataSource" ref="dataSource" />

</bean>

</beans>

package com;

import java.sql.Types;

import javax.annotation.Resource;

import org.springframework.jdbc.core.JdbcTemplate;

public class NiutDAO implements INiutDAO {

@Resource

private JdbcTemplate jt;

public void daoUpdateRegister(int age,int id) {

String sql = "UPDATE register SET age=? WHERE id=?";

Object params[] = new Object[] { new Integer(age),

new Integer(id) };

int type[] = new int[] { Types.INTEGER , Types.INTEGER };

jt.update(sql, params, type);

}

}

package com;

public interface INiutDAO {

public void daoUpdateRegister(int age,int id);

}

更多请见下节：https://blog.csdn.net/mark_to_win/article/details/88698077