春秋如斯

第03节_加入声明式事务

1、配置事务管理器

<!-- 配置事务管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <!-- 装配数据源 -->
    <property name="dataSource" ref="druidDataSource"/>
</bean>
 
<!-- 开启基于注解的声明式事务 -->
<tx:annotation-driven transaction-manager="transactionManager"/>

注意：引入tx名称空间时千万注意名称空间的值

img

2、创建Service组件

img

@Service
public class EmpServiceImpl implements EmpService {
 
    @Autowired
    private EmpMapper empMapper;
 
    @Override
    @Transactional(readOnly = true)
    public List<Emp> getAll() {
        return empMapper.selectAll();
    }
}

3、配置自动扫描的包

img

<context:component-scan base-package="com.atguigu.ssm.service"/>

4、测试

@Autowired
private EmpService empService;
 
@Test
public void testTx() {
    List<Emp> empList = empService.getAll();
    for (Emp emp : empList) {
        log.debug("emp = " + emp);
    }
}

在框架打印的日志中能够看到事务打开、提交、回滚等操作即可确认声明式事务已生效。

相关日志信息节选： urceTransactionManager - Acquired Connection [com.mysql.jdbc.JDBC4Connection@488d1cd7] for JDBC transaction urceUtils - Setting JDBC Connection [com.mysql.jdbc.JDBC4Connection@488d1cd7] read-only urceTransactionManager - Switching JDBC Connection [com.mysql.jdbc.JDBC4Connection@488d1cd7] to manual commit ing a new SqlSession tering transaction synchronization for SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@babafc2] edTransaction - JDBC Connection [com.mysql.jdbc.JDBC4Connection@488d1cd7] will be managed by Spring ctAll - ==> Preparing: select emp_id,emp_name,emp_salary from t_emp ctAll - ==> Parameters: ctAll - <== Total: 15 sing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@babafc2] action synchronization committing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@babafc2] action synchronization deregistering SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@babafc2] action synchronization closing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@babafc2] urceTransactionManager - Initiating transaction commit urceTransactionManager - Committing JDBC transaction on Connection [com.mysql.jdbc.JDBC4Connection@488d1cd7] urceUtils - Resetting read-only flag of JDBC Connection [com.mysql.jdbc.JDBC4Connection@488d1cd7] urceTransactionManager - Releasing JDBC Connection [com.mysql.jdbc.JDBC4Connection@488d1cd7] after transaction