Spring的Jdbc事务-注解

一、拷贝必要的jar包到工程的lib目录

二、创建spring的配置文件并导入约束

<?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: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/tx 
                http://www.springframework.org/schema/tx/spring-tx.xsd
                http://www.springframework.org/schema/aop 
                http://www.springframework.org/schema/aop/spring-aop.xsd">    
</beans>

三、准备数据库表和实体类

package com.yiidian.domain;

import java.io.Serializable;
/**
 * @author http://www.yiidian.com
 * 
 */
public class Account implements Serializable{
	private Integer id;
	private String name;
	private Float money;
	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 Float getMoney() {
		return money;
	}
	public void setMoney(Float money) {
		this.money = money;
	}
	@Override
	public String toString() {
		return "Account [id=" + id + ", name=" + name + ", money=" + money
				+ "]";
	}

	
}

四、编写业务层接口和实现类

AccountService：

package com.yiidian.service;

import com.yiidian.domain.Account;
/**
 * @author http://www.yiidian.com
 * 
 */
public interface AccountService {
	/**
	 * 根据id查询账户信息
	 * @param id
	 * @return
	 */
	Account findAccountById(Integer id);//查
	
	/**
	 * 转账
	 * @param sourceName	转出账户名称
	 * @param targeName		转入账户名称
	 * @param money			转账金额
	 */
	void transfer(String sourceName,String targeName,Float money);//增删改
}

AccountServiceImpl：

package com.yiidian.service.impl;

import org.springframework.transaction.annotation.Transactional;

import com.yiidian.dao.AccountDao;
import com.yiidian.domain.Account;
import com.yiidian.service.AccountService;
/**
 * @author http://www.yiidian.com
 * 
 */
@Transactional
public class AccountServiceImpl implements AccountService {
	private AccountDao accountDao;

	public void setAccountDao(AccountDao accountDao) {
		this.accountDao = accountDao;
	}

	@Override
	public Account findAccountById(Integer id) {
		return accountDao.findAccountById(id);
	}

	@Override
	public void transfer(String sourceName, String targeName, Float money) {
		// 1.根据名称查询两个账户
		Account source = accountDao.findAccountByName(sourceName);
		Account target = accountDao.findAccountByName(targeName);
		// 2.修改两个账户的金额
		source.setMoney(source.getMoney() - money);// 转出账户减钱
		target.setMoney(target.getMoney() + money);// 转入账户加钱
		// 3.更新两个账户
		accountDao.updateAccount(source);
		//模拟异常
		//int i = 1 / 0;
		accountDao.updateAccount(target);
	}
}

注意：CustomerServiceImpl类上面有@Transactional注解，这就是注解事务的关键用法。

五、编写Dao接口和实现类

AccountDao：

package com.yiidian.dao;

import com.yiidian.domain.Account;

/**
 * 
 * @author http://www.yiidian.com
 * 
 */
public interface AccountDao {

	/**
	 * 根据id查询账户信息
	 * @param id
	 * @return
	 */
	Account findAccountById(Integer id);

	/**
	 * 根据名称查询账户信息
	 * @return
	 */
	Account findAccountByName(String name);
	
	/**
	 * 更新账户信息
	 * @param account
	 */
	void updateAccount(Account account);
}

AccountDaoImpl:

package com.yiidian.dao.impl;

import java.util.List;

import org.springframework.jdbc.core.support.JdbcDaoSupport;

import com.yiidian.dao.AccountDao;
import com.yiidian.domain.Account;
/**
 * 
 * @author http://www.yiidian.com
 * 
 */
public class AccountDaoImpl extends JdbcDaoSupport  implements AccountDao{
	@Override
	public Account findAccountById(Integer id) {
		List<Account> list = getJdbcTemplate().query("select * from account where id = ? ",new AccountRowMapper(),id);
		return list.isEmpty()?null:list.get(0);
	}

	@Override
	public Account findAccountByName(String name) {
		List<Account> list =  getJdbcTemplate().query("select * from account where name = ? ",new AccountRowMapper(),name);
		if(list.isEmpty()){
			return null;
		}
		if(list.size()>1){
			throw new RuntimeException("结果集不唯一，不是只有一个账户对象");
		}
		return list.get(0);
	}

	@Override
	public void updateAccount(Account account) {
		getJdbcTemplate().update("update account set money = ? where id = ? ",account.getMoney(),account.getId());
	}
}

AccountRowMapper：

package com.yiidian.dao.impl;

import java.sql.ResultSet;
import java.sql.SQLException;

import org.springframework.jdbc.core.RowMapper;

import com.yiidian.domain.Account;
/**
 * 账户的封装类RowMapper的实现类
 * @author http://www.yiidian.com
 *
 */
public class AccountRowMapper implements RowMapper<Account>{
	@Override
	public Account mapRow(ResultSet rs, int rowNum) throws SQLException {
		Account account = new Account();
		account.setId(rs.getInt("id"));
		account.setName(rs.getString("name"));
		account.setMoney(rs.getFloat("money"));
		return account;
	}
}

六、配置业务层和持久层，加上Spring事务管理

<?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: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/tx 
    			http://www.springframework.org/schema/tx/spring-tx.xsd
        		http://www.springframework.org/schema/aop 
        		http://www.springframework.org/schema/aop/spring-aop.xsd">

	<bean
		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="location" value="classpath:jdbc.properties" />
	</bean>

	<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
		<property name="dataSource" ref="dataSource" />
	</bean>

	<bean id="dataSource"
		class="org.springframework.jdbc.datasource.DriverManagerDataSource">
		<property name="driverClassName" value="${jdbc.driverClass}" />
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
	</bean>

	<!-- 在AccountDaoImpl类直接注入dataSource即可 -->
	<bean id="accountDao" class="com.yiidian.dao.impl.AccountDaoImpl">
		<property name="dataSource" ref="dataSource" />
	</bean>

	<bean id="accountService" class="com.yiidian.service.impl.AccountServiceImpl">
		<property name="accountDao" ref="accountDao"></property>
	</bean>

	<!-- 配置一个事务管理器 -->
	<bean id="transactionManager"
		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<!-- 注入DataSource -->
		<property name="dataSource" ref="dataSource"></property>
	</bean>

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

</beans>

注意：必须使用这段xml来开启Spring注解事务才可以使用@Transactional注解。

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

七、编写测试类

package com.yiidian.test;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.yiidian.service.AccountService;

/**
 * @author http://www.yiidian.com
 * 
 */
public class JdbcTemplateDemo {

	/**
	 * 添加操作
	 */
	@Test
	public void test1() {
		ApplicationContext ac = new ClassPathXmlApplicationContext(
				"applicationContext.xml");
		AccountService accountService = (AccountService)ac.getBean("accountService");
		accountService.transfer("小苍", "小泽", 300f);
	}


}

源码下载：http://pan.baidu.com/s/1eSOtYJC