Spring实战之使用注解实现声明式事务操作示例

本文实例讲述了spring实战之使用注解实现声明式事务操作。分享给大家供大家参考，具体如下：

一 配置文件

<?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"/>
   <!-- 配置一个业务逻辑bean -->
   <bean id="newsdao" class="org.crazyit.app.dao.impl.newsdaoimpl"
      p:ds-ref="datasource"/>
   <!-- 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"/>
   <!-- 根据annotation来生成事务代理 -->
   <tx:annotation-driven transaction-manager="transactionmanager"/>
</beans>

二 dao

1 接口

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

2 实现类

package org.crazyit.app.dao.impl;
import javax.sql.datasource;
import java.sql.connection;
import org.springframework.jdbc.core.jdbctemplate;
import org.springframework.transaction.annotation.*;
import org.crazyit.app.dao.*;
public class newsdaoimpl implements newsdao
{
  private datasource ds;
  public void setds(datasource ds)
  {
    this.ds = ds;
  }
  @transactional(propagation=propagation.required ,
    isolation=isolation.default , timeout=5)
  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 , ? , ?)"
      , title , 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。
  }
}

三 测试类

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("newsdaotrans" , newsdao.class);
    // 执行插入操作
    dao.insert("疯狂java" , "轻量级java ee企业应用实战");
  }
}

四 测试

数据库没生成数据，说明事务生效。

exception in thread "main"  org.springframework.dao.duplicatekeyexception:  preparedstatementcallback; sql [insert into news_inf  values(null , ? , ?)]; duplicate entry '疯狂java' for key  'news_title'; nested exception is  com.mysql.jdbc.exceptions.jdbc4.mysqlintegrityconstraintviolationexception: duplicate entry '疯狂java' for key 'news_title'
     at  org.springframework.jdbc.support.sqlerrorcodesqlexceptiontranslator.dotranslate(sqlerrorcodesqlexceptiontranslator.java:239)
     at  org.springframework.jdbc.support.abstractfallbacksqlexceptiontranslator.translate(abstractfallbacksqlexceptiontranslator.java:73)
     at  org.springframework.jdbc.core.jdbctemplate.execute(jdbctemplate.java:660)
     at  org.springframework.jdbc.core.jdbctemplate.update(jdbctemplate.java:909)
     at  org.springframework.jdbc.core.jdbctemplate.update(jdbctemplate.java:970)
     at  org.springframework.jdbc.core.jdbctemplate.update(jdbctemplate.java:980)
     at  org.crazyit.app.dao.impl.newsdaoimpl.insert(newsdaoimpl.java:33)
     at sun.reflect.nativemethodaccessorimpl.invoke0(native  method)
     at  sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62)
     at  sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)
     at java.lang.reflect.method.invoke(method.java:498)
     at  org.springframework.aop.support.aoputils.invokejoinpointusingreflection(aoputils.java:317)
     at  org.springframework.aop.framework.reflectivemethodinvocation.invokejoinpoint(reflectivemethodinvocation.java:190)
     at  org.springframework.aop.framework.reflectivemethodinvocation.proceed(reflectivemethodinvocation.java:157)
     at  org.springframework.transaction.interceptor.transactioninterceptor$1.proceedwithinvocation(transactioninterceptor.java:98)
     at  org.springframework.transaction.interceptor.transactionaspectsupport.invokewithintransaction(transactionaspectsupport.java:262)
     at  org.springframework.transaction.interceptor.transactioninterceptor.invoke(transactioninterceptor.java:95)
     at  org.springframework.aop.framework.reflectivemethodinvocation.proceed(reflectivemethodinvocation.java:179)
     at  org.springframework.aop.framework.jdkdynamicaopproxy.invoke(jdkdynamicaopproxy.java:207)
     at com.sun.proxy.$proxy4.insert(unknown source)
     at lee.springtest.main(springtest.java:28)
caused by:  com.mysql.jdbc.exceptions.jdbc4.mysqlintegrityconstraintviolationexception: duplicate entry '疯狂java' for key 'news_title'
     at  sun.reflect.nativeconstructoraccessorimpl.newinstance0(native  method)
     at  sun.reflect.nativeconstructoraccessorimpl.newinstance(nativeconstructoraccessorimpl.java:62)
     at  sun.reflect.delegatingconstructoraccessorimpl.newinstance(delegatingconstructoraccessorimpl.java:45)
     at  java.lang.reflect.constructor.newinstance(constructor.java:423)
     at com.mysql.jdbc.util.handlenewinstance(util.java:409)
     at com.mysql.jdbc.util.getinstance(util.java:384)
     at  com.mysql.jdbc.sqlerror.createsqlexception(sqlerror.java:1039)
     at  com.mysql.jdbc.mysqlio.checkerrorpacket(mysqlio.java:4232)
     at  com.mysql.jdbc.mysqlio.checkerrorpacket(mysqlio.java:4164)
     at com.mysql.jdbc.mysqlio.sendcommand(mysqlio.java:2615)
     at  com.mysql.jdbc.mysqlio.sqlquerydirect(mysqlio.java:2776)
     at  com.mysql.jdbc.connectionimpl.execsql(connectionimpl.java:2838)
     at  com.mysql.jdbc.preparedstatement.executeinternal(preparedstatement.java:2082)
     at  com.mysql.jdbc.preparedstatement.executeupdate(preparedstatement.java:2334)
     at  com.mysql.jdbc.preparedstatement.executeupdate(preparedstatement.java:2262)
     at  com.mysql.jdbc.preparedstatement.executeupdate(preparedstatement.java:2246)
     at  com.mchange.v2.c3p0.impl.newproxypreparedstatement.executeupdate(newproxypreparedstatement.java:147)
     at  org.springframework.jdbc.core.jdbctemplate$2.doinpreparedstatement(jdbctemplate.java:916)
     at  org.springframework.jdbc.core.jdbctemplate$2.doinpreparedstatement(jdbctemplate.java:909)
     at  org.springframework.jdbc.core.jdbctemplate.execute(jdbctemplate.java:644)
     ... 18 more