spring-注解----transaction

      spring-注解----transaction

 package com.zwj.config;

import java.beans.PropertyVetoException;

import javax.sql.DataSource;

import org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator;
import org.springframework.aop.framework.autoproxy.InfrastructureAdvisorAutoProxyCreator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.AnnotationTransactionAttributeSource;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration;
import org.springframework.transaction.annotation.TransactionManagementConfigurationSelector;
import org.springframework.transaction.annotation.Transactional;

import com.mchange.v2.c3p0.ComboPooledDataSource;

/**
 * 声明式事务：
 * 
 * 环境搭建：
 * 1、导入相关依赖
 *         数据源、数据库驱动、Spring-jdbc模块
 * 2、配置数据源、JdbcTemplate（Spring提供的简化数据库操作的工具）操作数据
 * 3、给方法上标注 @Transactional 表示当前方法是一个事务方法；
 * 4、 @EnableTransactionManagement 开启基于注解的事务管理功能；
 *         @EnableXXX
 * 5、配置事务管理器来控制事务;
 *         @Bean
 *         public PlatformTransactionManager transactionManager()
 * 
 * 
 * 原理：
 * 1）、@EnableTransactionManagement
 *             利用TransactionManagementConfigurationSelector给容器中会导入组件
 *             导入两个组件
 *             AutoProxyRegistrar
 *             ProxyTransactionManagementConfiguration
 * 2）、AutoProxyRegistrar：
 *             给容器中注册一个 InfrastructureAdvisorAutoProxyCreator 组件；
 *             InfrastructureAdvisorAutoProxyCreator：？
 *             利用后置处理器机制在对象创建以后，包装对象，返回一个代理对象（增强器），代理对象执行方法利用拦截器链进行调用；
 * 
 * 3）、ProxyTransactionManagementConfiguration 做了什么？
 *             1、给容器中注册事务增强器；
 *                 1）、事务增强器要用事务注解的信息，AnnotationTransactionAttributeSource解析事务注解
 *                 2）、事务拦截器：
 *                     TransactionInterceptor；保存了事务属性信息，事务管理器；
 *                     他是一个 MethodInterceptor；
 *                     在目标方法执行的时候；
 *                         执行拦截器链；
 *                         事务拦截器：
 *                             1）、先获取事务相关的属性
 *                             2）、再获取PlatformTransactionManager，如果事先没有添加指定任何transactionmanger
 *                                 最终会从容器中按照类型获取一个PlatformTransactionManager；
 *                             3）、执行目标方法
 *                                 如果异常，获取到事务管理器，利用事务管理回滚操作；
 *                                 如果正常，利用事务管理器，提交事务
 *             
 */
@EnableTransactionManagement
@ComponentScan("com.zwj.tx")
@Configuration
public class TxConfig {
    
    //数据源
    @Bean
    public DataSource dataSource() throws Exception{
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setUser("root");
        dataSource.setPassword("123456");
        dataSource.setDriverClass("com.mysql.jdbc.Driver");
        dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/test");
        return dataSource;
    }
    
    //
    @Bean
    public JdbcTemplate jdbcTemplate() throws Exception{
        //Spring对@Configuration类会特殊处理；给容器中加组件的方法，多次调用都只是从容器中找组件
        JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource());
        return jdbcTemplate;
    }
    
    //注册事务管理器在容器中
    @Bean
    public PlatformTransactionManager transactionManager() throws Exception{
        return new DataSourceTransactionManager(dataSource());
    }
    

}

package com.zwj.tx;

import java.util.UUID;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

@Repository
public class UserDao {
    
    @Autowired
    private JdbcTemplate jdbcTemplate;
    public void insert(){
        String sql = "INSERT INTO `tbl_user`(username,age) VALUES(?,?)";
        String username = UUID.randomUUID().toString().substring(0, 5);
        jdbcTemplate.update(sql, username,19);
        
    }

}

package com.zwj.tx;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;


@Service
public class UserService {
    
    @Autowired
    private UserDao userDao;
    
    @Transactional
    public void insertUser(){
        userDao.insert();
        //otherDao.other();xxx
        System.out.println("插入完成...");
        int i = 10/0;
    }

}

package com.zwj.test;

import org.junit.Test;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import com.zwj.config.TxConfig;
import com.zwj.tx.UserService;



public class IOCTest_Tx {
    
    @Test
    public void test01(){
        AnnotationConfigApplicationContext applicationContext = 
                new AnnotationConfigApplicationContext(TxConfig.class);
    
        UserService userService = applicationContext.getBean(UserService.class);
        
        userService.insertUser();
        applicationContext.close();
    }

}

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.zwj</groupId>
  <artifactId>spring-annotation---transactions</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <dependencies>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.12.RELEASE</version>
        </dependency>
        
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>4.3.12.RELEASE</version>
        </dependency>
        
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.3.12.RELEASE</version>
        </dependency>
        
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.inject/javax.inject -->
        <dependency>
            <groupId>javax.inject</groupId>
            <artifactId>javax.inject</artifactId>
            <version>1</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/c3p0/c3p0 -->
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.44</version>
        </dependency>





    </dependencies>
</project>