Spring事务的实现

1、添加jar包

 <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.0.8.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>

        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.0.8.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.8.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>5.0.8.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>5.0.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>5.0.8.RELEASE</version>
        </dependency>



        <dependency>
            <groupId>aopalliance</groupId>
            <artifactId>aopalliance</artifactId>
            <version>1.0</version>
        </dependency>

        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.13</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>5.0.8.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>5.0.8.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>5.0.8.RELEASE</version>
        </dependency>

    </dependencies>

2、User实体类

package com.fan.entity;

public class User {
    private int id;
    private String name;
    private String sex;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }
}

3、UserDao类和UserDaoImpl类

package com.fan.dao;

import com.fan.entity.User;

public interface UserDao {
    //更新数据库中的数据
    public int update(User user);
}

package com.fan.dao.impl;

import com.fan.dao.UserDao;
import com.fan.entity.User;
import org.springframework.jdbc.core.support.JdbcDaoSupport;

public class UserDaoImpl extends JdbcDaoSupport implements UserDao {

    public int update(User user) {
        String sql="update users set name=?,sex=? where id=?";
        int update = getJdbcTemplate().update(sql, user.getName(), user.getSex(), user.getId());
        System.out.println(5/0);
        return update;
    }
}

4、UserService类和UserServiceImpl类

package com.fan.service;

import com.fan.entity.User;

public interface UserService {
    //更新数据库中的数据
    public int update(User user);
}

package com.fan.service.impl;

import com.fan.dao.UserDao;
import com.fan.entity.User;
import com.fan.service.UserService;

public class UserServiceImpl implements UserService {
    private UserDao userDao;

    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }

    public int update(User user) {
      //userDao里面报错，那么根据事务的原子性，数据更新就不会成功，回滚
       return userDao.update(user);
    }
}

5、applicationContext.xml配置

<?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:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans 
                           http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/context
                           http://www.springframework.org/schema/context/spring-context.xsd
                            http://www.springframework.org/schema/aop
                           http://www.springframework.org/schema/aop/spring-aop.xsd
                           http://www.springframework.org/schema/tx
                           http://www.springframework.org/schema/tx/spring-tx.xsd
">


    <context:property-placeholder location="classpath:db.properties"></context:property-placeholder>
    <!--1、指定数据源-->
    <bean id="datasource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${driver}"></property>
        <property name="jdbcUrl" value="${url}"></property>
        <property name="user" value="${uname}"></property>
        <property name="password" value="${password}"></property>
    </bean>
    <!--2、创建jdbcTemplate-->
    <bean id="template" class="org.springframework.jdbc.core.JdbcTemplate">
        <constructor-arg index="0" ref="datasource"></constructor-arg>
    </bean>

    <!--3、创建dao层对象-->
    <bean id="dao1" class="com.fan.dao.impl.UserDaoImpl">
        <property name="jdbcTemplate" ref="template"></property>
    </bean>
    <!--3、创建service层对象-->
    <bean id="service" class="com.fan.service.impl.UserServiceImpl">
        <property name="userDao" ref="dao1"></property>
    </bean>


    <!-- 添加声明式事务-->
    <!--1、创建事务管理器对象-->
    <bean id="transactionManager"
          class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="datasource"/>
    </bean>

    <!-- 2、定义哪些方法需要事务管理，添加tx命名空间 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <!-- 传播行为:propagation  不是必须的,默认值是REQUIRED  -->
            <!-- REQUIRED：如果有事务，则在事务中执行；如果没有事务，则开启一个新的事务 -->
            <!-- SUPPORTS：如果有事务，则在事务中执行；如果没有事务，则不会开启事务 -->
            <tx:method name="update*" propagation="REQUIRED" />
            <tx:method name="insert*" propagation="REQUIRED" />
            <tx:method name="delete*" propagation="REQUIRED" />
        </tx:attributes>
    </tx:advice>

    <!--将接口和方法绑定在一起，一般与service层接口绑定-->
    <aop:config>
         <!--切入点-->
        <aop:pointcut id="txPointCut" expression="execution(* com.fan.service.*.*(..))" />
    
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
    </aop:config>
</beans>

6、测试类

import com.fan.entity.User;
import com.fan.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test1 {
    public static void main(String[] args) {
        ApplicationContext applicationContext=
                new ClassPathXmlApplicationContext("applicationContext.xml");
        UserService userService =(UserService)applicationContext.getBean("service");
        User user=new User();
        user.setId(2);
        user.setName("aaa");
        user.setSex("男");
        int update = userService.update(user);
        System.out.println(update);

    }
}

    因为5/0是错误运算，所以这里面不能实现数据库的更改

7、注解方式添加事务

applicationContext.xml配置

    <!--1、创建事务管理器对象-->
    <bean id="tx"  class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="datasource"/>
    </bean>

    <!--① 对标注@Transactional注解的Bean进行加工处理,以织入事物管理切面 -->
    <tx:annotation-driven transaction-manager="tx" />

在需要添加事务的类或方法上添加该注解

@Transactional(propagation = Propagation.REQUIRED)