基于注解的事务加载

一、知识点总结
spring基于注解的 事务配置:

@Transactional注解 可以放在 类的上面
放在类的上面 代表当前类下的所有方法 都添加了事务

@Transactional注解 可以放在 方法上面
放在方法上面 代表当前这个方法 添加了事务 ，其它方法没有事务;
二、工程架构
（1）架构图


（2）案例Code

1.com.oracle.dao包：
package com.oracle.dao;

public interface AccountDao {

    public void outer(String outer, double money);//汇款人

    public void inner(String inner, double money);//收款人


}

2.com.oracle.daoImpl包：
package com.oracle.daoImpl;

import com.oracle.dao.AccountDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
//AccountDaoImpl IOC
@Repository("accountDaoId")
public class AccountDaoImpl implements AccountDao {

    /**
     * jdbcTemplate
     *
     * @param outer
     * @param money
     */
    //依赖注入
    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Override
    public void outer(String outer, double money) {
        String sql = "update account set balance = balance - ? where name = ?";
        int a = jdbcTemplate.update(sql, money, outer);
    }

    @Override
    public void inner(String inner, double money) {
        String sql = "update account set balance = balance + ? where name = ?";
        int a = jdbcTemplate.update(sql, money, inner);
    }
}

3.com.oracle.service包：
package com.oracle.service;

public interface AccountService {
    /**
     *
     * @param outer 汇款人
     * @param inner 收款人
     * @param money 转账金额
     */
    public void transfer(String outer, String inner, int money);

}

4.com.oracle.serviceImpl包：
package com.oracle.serviceImpl;

import com.oracle.dao.AccountDao;
import com.oracle.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
//AccountServiceImpl IOC
@Service
/*@Transactional(propagation = Propagation.REQUIRED,isolation = Isolation.DEFAULT)*/
public class AccountServiceImpl implements AccountService {

    //依赖注入
    @Autowired
    @Qualifier("accountDaoId")
    private AccountDao accountDao;

    //为方法加事务,propagation传播方式，isolation隔离级别
    @Override
    @Transactional(propagation = Propagation.REQUIRED,isolation = Isolation.DEFAULT)
    public void transfer(String outer, String inner, int money) {

        //调用 转账
        accountDao.outer(outer,money);

        //转账的时候出现了异常
        int i = 1/0;

        //收款
        accountDao.inner(inner,money);
    }

}

5. com.oracle.test包：
package com.oracle.test;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.pool.DruidPooledConnection;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import com.oracle.service.AccountService;
import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.sql.Connection;
import java.sql.SQLException;

public class Demo {
    @Test
    public void Testc3p0() throws Exception {
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setDriverClass("com.mysql.jdbc.Driver");
        dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf8&useSSL=false&serverTimezone=UTC");
        dataSource.setUser("root");
        dataSource.setPassword("123");
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
    }
    @Test
    public void Testdruid() throws SQLException {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf8&useSSL=false&serverTimezone=UTC");
        dataSource.setUsername("root");
        dataSource.setPassword("123");
        DruidPooledConnection connection = dataSource.getConnection();
        System.out.println(connection);

    }
    @Test
    public void Testtansfer(){
        ClassPathXmlApplicationContext c = new ClassPathXmlApplicationContext("config/applicationContext.xml");
        AccountService accountService = c.getBean(AccountService.class);
        accountService.transfer("张三","王五",200);
        System.out.println("执行完毕！");
    }
}

6.com.oracle.vo包：
package com.oracle.vo;

public class Account {

    private Integer id;
    private String name;
    private Double balance;

    public Integer getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public Double getBalance() {
        return balance;
    }

    public void setBalance(Double balance) {
        this.balance = balance;
    }

    @Override
    public String toString() {
        return "Account{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", balance=" + balance +
                '}';
    }
}

7.config包：
1）applicationContext.xml



    
    

    
    

    
    
        
        
        
        
    

    
    
        
    

    
    
        
    

    
    


=========================
2)db.properties
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf8&useSSL=false&serverTimezone=UTC
username=root
password=123

(3)结果图

说明钱没丢