Spring’s actual example of managing declarative transaction operations using XML

This article illustrates how spring uses XML to manage declarative transaction operations. Share with you for your reference, as follows:

One configuration file

<?xml version="1.0" encoding="GBK"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns="http://www.springframework.org/schema/beans"
   xmlns:p="http://www.springframework.org/schema/p"
   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-4.0.xsd
   http://www.springframework.org/schema/aop
   http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
   http://www.springframework.org/schema/tx
   http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">
   <!-- 定义数据源Bean，使用C3P0数据源实现，并注入数据源的必要信息 -->
   <bean id="dataSource"
      class="com.mchange.v2.c3p0.ComboPooledDataSource"
      destroy-method="close" p:driverClass="com.MysqL.jdbc.Driver"
      p:jdbcUrl="jdbc:MysqL://localhost/spring" p:user="root"
      p:password="32147" p:maxPoolSize="40" p:minPoolSize="2"
      p:initialPoolSize="2" p:maxIdleTime="30" />
   <!-- 配置JDBC数据源的局部事务管理器，使用DataSourceTransactionManager 类 -->
   <!-- 该类实现PlatformTransactionManager接口，是针对采用数据源连接的特定实现 -->
   <!-- 配置DataSourceTransactionManager时需要依注入DataSource的引用 -->
   <bean id="transactionManager"
      class="org.springframework.jdbc.datasource.DataSourceTransactionManager"
      p:dataSource-ref="dataSource" />
   <!-- 配置一个业务逻辑Bean -->
   <bean id="newsDao" class="org.crazyit.app.dao.impl.NewsDaoImpl"
      p:ds-ref="dataSource" />
   <!-- 配置事务增强处理Bean,指定事务管理器 -->
   <tx:advice id="txAdvice"
      transaction-manager="transactionManager">
      <!-- 用于配置详细的事务语义 -->
      <tx:attributes>
        <!-- 所有以'get'开头的方法是read-only的 -->
        <tx:method name="get*" read-only="true" />
        <!-- 其他方法使用默认的事务设置，指定超时时长为5秒 -->
        <tx:method name="*" isolation="DEFAULT"
           propagation="required" timeout="5" />
      </tx:attributes>
   </tx:advice>
   <!-- AOP配置的元素 -->
   <aop:config>
      <!-- 配置一个切入点，匹配org.crazyit.app.dao.impl包下 所有以Impl结尾的类里、所有方法的执行 -->
      <aop:pointcut id="mypointcut"
        expression="execution(* org.crazyit.app.dao.impl.*Impl.*(..))" />
      <!-- 指定在mypointcut切入点应用txAdvice事务增强处理 -->
      <aop:advisor advice-ref="txAdvice"
        pointcut-ref="mypointcut" />
   </aop:config>
</beans>

Second Dao

1 interface

package org.crazyit.app.dao;
public interface NewsDao
{
   public void insert(String title,String content);
}

2 implementation class

package org.crazyit.app.dao.impl;
import javax.sql.DataSource;
import java.sql.Connection;
import org.springframework.jdbc.core.JdbcTemplate;
import org.crazyit.app.dao.*;
public class NewsDaoImpl implements NewsDao
{
  private DataSource ds;
  public void setDs(DataSource ds)
  {
    this.ds = ds;
  }
  public void insert(String title,String content)
  {
    JdbcTemplate jt = new JdbcTemplate(ds);
    jt.update("insert into news_inf"
      + " values(null,?,?)",title,content);
    // 两次插入的数据违反唯一键约束
    jt.update("insert into news_inf"
      + " values(null,content);
    // 如果没有事务控制，则第一条记录可以被插入
    // 如果增加事务控制，将发现第一条记录也插不进去。
  }
}

Three test categories

package lee;
import org.springframework.context.support.*;
import org.springframework.context.*;
import org.crazyit.app.dao.*;
public class SpringTest
{
  public static void main(String[] args)
  {
    // 创建spring容器
    ApplicationContext ctx = new
      ClassPathXmlApplicationContext("beans.xml");
    // 获取事务代理Bean
    NewsDao dao = (NewsDao)ctx
      .getBean("newsDao",NewsDao.class);
    // 执行插入操作
    dao.insert("疯狂Java","轻量级Java EE企业应用实战");
  }
}

IV. test results

The data is not inserted into the database, indicating that the transaction is effective

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