19、spring注解学习（声明式事务）——spring注解版声明式事务

1、用jdbc操作数据库举例，在导入了aop和spring依赖以外，导入sping-jdbc依赖，先创建配置类TxConfig,在类中注册了三个bean

dataSource

jdbcTemplate

platformTransactionManager

还有@EnableTransactionManagement//开启基于注解的事务管理功能  千万不能忘记！

package crm.mytest.tc;

import com.mchange.v2.c3p0.ComboPooledDataSource;
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.EnableTransactionManagement;

import javax.sql.DataSource;
import java.beans.PropertyVetoException;
@EnableTransactionManagement//开启基于注解的事务管理功能，重要！！！
@Configuration
@ComponentScan("crm.mytest.tc")
public class TxConfig {
    /**
     * DataSource
     * @return
     * @throws PropertyVetoException
     */
    @Bean
    public DataSource dataSource() throws PropertyVetoException {
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setUser("root");
        dataSource.setPassword("123");
        dataSource.setDriverClass("com.mysql.jdbc.Driver");
        dataSource.setJdbcUrl("jdbc:mysql:///crm");
        return dataSource;
    }
    @Bean
    public JdbcTemplate jdbcTemplate(DataSource dataSource){
        JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
        return jdbcTemplate;
    }
    //注册事务管理器在容器中，重要！！！
    @Bean
    public PlatformTransactionManager platformTransactionManager() throws PropertyVetoException {
　　　　return new DataSourceTransactionManager(dataSource());//放入数据源
    }
}

2、简略的创建一个UserDao和UserService，模拟一下开发的mvc模式，这里就先不用接口了

package crm.mytest.tc;

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 test values(?,?,?)";
         jdbcTemplate.update(sql, null, "liweijun",1);
    }
}

package crm.mytest.tc;

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 insert(){
        userDao.insert();
        System.out.println("插入完成");
      //  int i=1/0;
    }
}

3、最后是测试类

package crm.mytest.tc;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = crm.mytest.tc.TxConfig.class)
public class Demo {
    @Autowired
    private UserService userService;
    @Test
    public void demo1(){
        userService.insert();
    }
}

最后可以自行测试在service层中制造异常，看是否回滚了