声明事务
步骤:
1) 引入spring-aop相关的4个jar文件
2) 引入aop名称空间 【XML配置方式需要引入】
3) 引入tx名称空间 【事务方式必须引入】
1. DeptDao.java |
public class DeptDao {
// 容器注入JdbcTemplate对象 private JdbcTemplate jdbcTemplate; public void setJdbcTemplate(JdbcTemplate jdbcTemplate) { this.jdbcTemplate = jdbcTemplate; }
public void save(Dept dept){ String sql = "insert into t_dept (deptName) values(?)"; jdbcTemplate.update(sql,dept.getDeptName()); } }
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2. DeptService |
public class DeptService {
// 容器注入dao对象 private DeptDao deptDao; public void setDeptDao(DeptDao deptDao) { this.deptDao = deptDao; }
/* * 事务控制? */ public void save(Dept dept){ // 第一次调用 deptDao.save(dept);
int i = 1/0; // 异常: 整个Service.save()执行成功的要回滚
// 第二次调用 deptDao.save(dept); } } |
3. App 测试类 |
@Test public void testApp() throws Exception { //容器对象 ApplicationContext ac = new ClassPathXmlApplicationContext("cn/itcast/a_tx/bean.xml");
// 模拟数据 Dept dept = new Dept(); dept.setDeptName("测试: 开发部");
DeptService deptService = (DeptService) ac.getBean("deptService"); deptService.save(dept);
} |
4. bean.xml (Spring声明式事务管理配置) |
<?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:p="http://www.springframework.org/schema/p" 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.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">
<!-- 1. 数据源对象: C3P0连接池 --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="com.mysql.jdbc.Driver"></property> <property name="jdbcUrl" value="jdbc:mysql:///hib_demo"></property> <property name="user" value="root"></property> <property name="password" value="root"></property> <property name="initialPoolSize" value="3"></property> <property name="maxPoolSize" value="10"></property> <property name="maxStatements" value="100"></property> <property name="acquireIncrement" value="2"></property> </bean>
<!-- 2. JdbcTemplate工具类实例 --> <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="dataSource"></property> </bean>
<!-- 3. dao实例 --> <bean id="deptDao" class="cn.itcast.a_tx.DeptDao"> <property name="jdbcTemplate" ref="jdbcTemplate"></property> </bean>
<!-- 4. service实例 --> <bean id="deptService" class="cn.itcast.a_tx.DeptService"> <property name="deptDao" ref="deptDao"></property> </bean>
<!-- #############5. Spring声明式事务管理配置############### --> <!-- 5.1 配置事务管理器类 --> <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"></property> </bean>
<!-- 5.2 配置事务增强(如果管理事务?) --> <tx:advice id="txAdvice" transaction-manager="txManager"> <tx:attributes> <tx:method name="get*" read-only="true"/> <tx:method name="find*" read-only="true"/> <tx:method name="*" read-only="false"/> </tx:attributes> </tx:advice>
<!-- 5.3 Aop配置: 拦截哪些方法(切入点表表达式) + 应用上面的事务增强配置 --> <aop:config> <aop:pointcut expression="execution(* cn.itcast.a_tx.DeptService.*())" id="pt"/> <aop:advisor advice-ref="txAdvice" pointcut-ref="pt"/> </aop:config>
</beans> |
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