spring框架学习(8)spring管理事务方式之注解配置
1.DAO
AccountDao.java
package cn.mf.dao; public interface AccountDao { //加钱 void increaseMoney(Integer id,Double money); //减钱 void decreaseMoney(Integer id,Double money); }
AccountDaoImpl.java
package cn.mf.dao; import org.springframework.jdbc.core.support.JdbcDaoSupport; public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao { @Override public void increaseMoney(Integer id, Double money) { getJdbcTemplate().update("update account set money = money+? where id = ? ", money,id); } @Override public void decreaseMoney(Integer id, Double money) { getJdbcTemplate().update("update account set money = money-? where id = ? ", money,id); } }
2.SERVICE
AccountService.java
package cn.mf.service; public interface AccountService { //转账方法 void transfer(Integer from,Integer to,Double money); }
AccountServiceImpl.java
package cn.mf.service; import org.springframework.transaction.TransactionStatus; import org.springframework.transaction.annotation.Isolation; import org.springframework.transaction.annotation.Propagation; import org.springframework.transaction.annotation.Transactional; import org.springframework.transaction.support.TransactionCallback; import org.springframework.transaction.support.TransactionCallbackWithoutResult; import org.springframework.transaction.support.TransactionTemplate; import cn.mf.dao.AccountDao; @Transactional(isolation=Isolation.REPEATABLE_READ,propagation=Propagation.REQUIRED,readOnly=true) public class AccountServiceImpl implements AccountService { private AccountDao ad ; private TransactionTemplate tt; @Override @Transactional(isolation=Isolation.REPEATABLE_READ,propagation=Propagation.REQUIRED,readOnly=false) public void transfer(final Integer from,final Integer to,final Double money) { //减钱 ad.decreaseMoney(from, money); //int i = 1/0; //加钱 ad.increaseMoney(to, money); } public void setAd(AccountDao ad) { this.ad = ad; } public void setTt(TransactionTemplate tt) { this.tt = tt; } }
3.db.properties
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/spring?characterEncoding=utf-8
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.user=root
jdbc.password=root
4.applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" 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-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd "> <!-- 指定spring读取db.properties配置 --> <context:property-placeholder location="classpath:db.properties" /> <!-- 事务核心管理器,封装了所有事务操作. 依赖于连接池 --> <bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" > <property name="dataSource" ref="dataSource" ></property> </bean> <!-- 事务模板对象 --> <bean name="transactionTemplate" class="org.springframework.transaction.support.TransactionTemplate" > <property name="transactionManager" ref="transactionManager" ></property> </bean> <!-- 开启使用注解管理aop事务 --> <tx:annotation-driven/> <!-- 1.将连接池 --> <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" > <property name="jdbcUrl" value="${jdbc.jdbcUrl}" ></property> <property name="driverClass" value="${jdbc.driverClass}" ></property> <property name="user" value="${jdbc.user}" ></property> <property name="password" value="${jdbc.password}" ></property> </bean> <!-- 2.Dao--> <bean name="accountDao" class="cn.mf.dao.AccountDaoImpl" > <property name="dataSource" ref="dataSource" ></property> </bean> <!-- 3.Service--> <bean name="accountService" class="cn.mf.service.AccountServiceImpl" > <property name="ad" ref="accountDao" ></property> <property name="tt" ref="transactionTemplate" ></property> </bean> </beans>
Junit
package cn.mf.tx; import javax.annotation.Resource; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; import cn.mf.service.AccountService; @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration("classpath:applicationContext2.xml") public class Demo2 { @Resource(name="accountService") private AccountService as; @Test public void fun1(){ as.transfer(1, 2, 100d); } }