XML方式实现Spring声明式事务管理

时间:2023-03-08 17:15:33
XML方式实现Spring声明式事务管理

1、首先编写一个实体类

public class Dept {
private int deptId;
private String deptName;
public int getDeptId() {
return deptId;
}
public void setDeptId(int deptId) {
this.deptId = deptId;
}
public String getDeptName() {
return deptName;
}
public void setDeptName(String deptName) {
this.deptName = deptName;
} }

2、编写Dao层

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());
}
}

3、编写Server层

public class DeptService {
// 容器注入dao对象
private DeptDao deptDao;
public void setDeptDao(DeptDao deptDao) {
this.deptDao = deptDao;
}
public void save(Dept dept){
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);
}
}

4、配置bean.xml文件

  4.1加入tx声明

xmlns:tx="http://www.springframework.org/schema/tx"

  4.2加入tx约束

http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd

  4.3编写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>

  4.4编写JdbcTemplate工具类实例

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

  4.5编写dao实例和service实例

    <bean id="deptDao" class="包名.DeptDao">
<property name="jdbcTemplate" ref="jdbcTemplate"></property>
</bean>
<bean id="deptService" class="包名.DeptService">
<property name="deptDao" ref="deptDao"></property>
</bean>

  4.6Spring声明式事务管理配置

    <!-- 配置事务管理器类 -->
<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean> <!-- 配置事务增强(如果管理事务?) -->
<tx:advice id="txAdvice" transaction-manager="txManager">
<tx:attributes>
<tx:method name="*" read-only="false"/>
</tx:attributes>
</tx:advice> <!-- 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.save(..))" id="pt"/>
<aop:advisor advice-ref="txAdvice" pointcut-ref="pt"/>
</aop:config>

  4.7完整的bean.xml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="包名.DeptDao">
<property name="jdbcTemplate" ref="jdbcTemplate"></property>
</bean> <!-- 4. service实例 -->
<bean id="deptService" class="包名.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="*" 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.save(..))" id="pt"/>
<aop:advisor advice-ref="txAdvice" pointcut-ref="pt"/>
</aop:config> </beans>

5.测试类

public class App {

    public void testApp() throws Exception {
//容器对象
ApplicationContext ac = new ClassPathXmlApplicationContext("包名/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);
}
}