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

希望本文所述对大家java程序设计有所帮助。