146 lines
3.7 KiB
Markdown
146 lines
3.7 KiB
Markdown
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# 第五章：Spring的事务管理
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transfer()的语句要么全做，要么全不做?
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```java
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把transfer方法做成事务方法。
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事务方法：方法体中的代码要么全部，要么全不做。
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```
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如何把transfer(）做成事务方法呢？
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```java
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1.基于xml文件
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2.基于注解
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```
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AOP关键导包
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```java
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<dependency>
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<groupId>org.aspectj</groupId >
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<artifactId>aspectjweaver</artifactId >
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<version>1.8.7</version >
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</dependency>
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```
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以转钱为例，在未进行事务管理之前转账记录在遇到异常会将方法执行一半，这样会使部分资金转账失效，并且无退回，用事务管理之后方法不会因为异常而执行一半，只有**完全执行**和**不执行**。
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## 一、基于XML方式的声明式事务
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#### （1）创建实体类
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同上
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#### （2）创建接口
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```java
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//转钱outUser给inUser转money钱
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void transfer(String outUser, String inUser, double money);
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```
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#### （3）实现接口
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```java
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//转钱outUser给inUser转money钱
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@Override
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public void transfer(String outUser, String inUser, double money) {
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String sql = "update account set balance=balance-? where username=?";
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jdbcTemplate.update(sql, money, outUser);
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//模拟异常
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System.out.println(1 / 0);
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String sql1 = "update account set balance=balance+? where username=?";
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jdbcTemplate.update(sql1, money, inUser);
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}
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```
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#### （4）写配置文件
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在上一章文件中增添以下配置
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```java
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<!-- 基于事务管理器，以来于数据源-->
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<bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
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<property name="dataSource" ref="dataSource"/>
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</bean>
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<!-- (1).基于XML方式的声明式事务-->
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<tx:advice id="txAdvice" transaction-manager="dataSourceTransactionManager">
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<tx:attributes>
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<tx:method name="*" propagation="REQUIRED" isolation="DEFAULT" read-only="false"/>
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</tx:attributes>
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</tx:advice>
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<aop:config>
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<aop:pointcut id="txPointCut" expression="execution(void com.gzh.dao.AccountDaoImpl.transfer(String,String,double))"/>
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<aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
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</aop:config>
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```
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#### （5）测试Test方法
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```java
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@Test
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//转钱outUser给inUser转money钱
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public void transferTest() {
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accountDao.transfer("zhangsan", "lisi", 500);
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}
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```
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#### 运行截图：
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1.无异常
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2.有异常
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## 二、基于Annotation（注解）方式的声明式事务
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#### （1）创建实体类
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同上
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#### （2）创建接口
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同上
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#### （3）实现接口
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```java
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//在实现类上添加注解
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@Transactional(propagation = Propagation.REQUIRED, isolation = Isolation.DEFAULT, readOnly = false)
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```
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#### （4）写配置文件
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在上一章文件中增添以下配置
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```java
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<!-- 基于事务管理器，以来于数据源-->
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<bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
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<property name="dataSource" ref="dataSource"/>
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</bean>
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<!-- (2).基于注解方式声明式事务-->
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<tx:annotation-driven transaction-manager="dataSourceTransactionManager"/>
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```
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#### （5）测试Test方法
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同上
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#### 运行截图：
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1.无异常：
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2.有异常：
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