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/qq_44591615/article/details/109206459
