Spring框架 注解配置事务控制的流程

目录

• 基于注解的事务控制

• 1.配置事务管理器
• 2.在业务层使用@Transactional 注解
• 3.开启 spring 对注解事务的支持
• 4.注解扫描器

• 1.事务的实现机制
• 2.注解方式的事务使用注意事项

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx"
	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 ">
	<!-- 配置c3p0数据源 -->
	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<property name="driverClass" value="com.mysql.jdbc.Driver" />
		<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/mybase2" />
		<property name="user" value="root" />
		<property name="password" value="Hudie" />
	</bean>
	<!-- 配置JdbcTemplate模板对象 -->
	<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
		<property name="dataSource" ref="dataSource"></property>
	</bean>
	<!-- 配置service层 -->
	<bean id="userService" class="com.gql.service.UserServiceImp">
		<property name="userDao" ref="userDao"></property>
	</bean>
	<!-- 配置dao层 -->
	<bean id="userDao" class="com.gql.dao.UserDaoImp">
		<property name="jdbcTemplate" ref="jdbcTemplate"></property>
	</bean>
	<!-- 事务管理器 -->
	<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<!-- 注入 DataSource-->
		<property name="dataSource" ref="dataSource"></property>
	</bean>
	<!-- 注解扫描器 -->
	<context:component-scan base-package="com.gql.service"></context:component-scan>
	<!-- 注解的事务配置 -->
	<tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

 <!-- 事务管理器 -->
 <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
  <!-- 注入 DataSource-->
  <property name="dataSource" ref="dataSource"></property>
 </bean>

package com.gql.service;
import java.util.List;
import org.springframework.transaction.annotation.Transactional;
import com.gql.dao.UserDao;
import com.gql.entity.User;
/**
 * 类说明:
 *		业务层实现类
 * @guoqianliang1998.
 */
@Transactional
public class UserServiceImp implements UserService {
	private UserDao userDao;
	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}
	@Override
	public void save(User user) {
		userDao.save(user);
		int i = 1/0;
	}
	@Override
	public void update(int id, User user) {
		userDao.update(id, user);
	}
	@Override
	public void delete(int id) {
		userDao.delete(id);
	}
	@Override
	public User getUser(int id) {
		User user = userDao.getUser(id);
		return user;
	}
	@Override
	public List<User> getUserList(int[] ids) {
		List<User> userList = userDao.getUserList(ids);
		return userList;
	}
	@Override
	public List<User> getUserList() {
		List<User> list = userDao.getUserList();
		return list;
	}
}

<!-- 开启 spring 对注解事务的支持 -->
 <tx:annotation-driven transaction-manager="transactionManager"/>

<!-- 注解扫描器 -->
 <context:component-scan base-package="com.gql.service"></context:component-scan>

private int getDepth(Class<?> exceptionClass, int depth) {
        if (exceptionClass.getName().contains(this.exceptionName)) {
            // Found it!
            return depth;
}
        // If we've gone as far as we can go and haven't found it...
        if (exceptionClass == Throwable.class) {
            return -1;
}
return getDepth(exceptionClass.getSuperclass(), depth + 1);
}

protected TransactionAttribute computeTransactionAttribute(Method method,
    Class<?> targetClass) {
        // Don't allow no-public methods as required.
        if (allowPublicMethodsOnly() && !Modifier.isPublic(method.getModifiers())) {
return null;}

-->
@Service
public class OrderService {
    private void insert() {
        insertOrder();
    }
    @Transactional
    public void insertOrder() {
        //insert log info
        //insertOrder
        //updateAccount
    }
}

class ServiceA{
  @Transactional(rollbackFor = Exception.class)
  public methodA1(){
     ......
     //该方式，methodA2上的事务注解不起作用，不会开启新的事务，methodA2与methodA1中的数据一起提交或回滚
     1.this.methodA2();
     //该方式，methodB1上的事务会启作用
     2.ServiceB.methodB1()
     ......
  };
  @Transactional(propagation = Propagation.REQUIRES_NEW, rollbackFor = Exception.class)
  public methodA2(){
     ......
  };
}
class ServiceB{
  @Transactional(propagation = Propagation.REQUIRES_NEW, rollbackFor = Exception.class)
  public methodB1(){
     ......
  };  
}