Mybatis入门实例(五)——MyBatis与Spring 3.X的整合

这篇文章主要是说明了Spring3和MyBatis的整合方法，之所以要整合就是将MyBatis创建factory等各种繁冗的工作以及对session的管理、事务的管理交由spring容器帮我们管理，省心省力。

这个项目是在我的前几篇文章的基础上加入spring的内容，关于MyBatis的项目如何建立请查阅我之前的关于MyBatis的帖子。

?

整个的项目结构如下：

先把包都导入吧，下面是所有需要的包，spring的包最恶心，共计需要18个包，而且从spring官网下载的zip里面仅仅有spring的jar包，引用的其他相关的包没有，好不容易终于凑齐了，全部都在最后面的示例项目中建立applicationContext.xml文件，放在类路径下面，内容如下：

<?xml version="1.0" encoding="UTF-8"?><beansxmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:p="http://www.springframework.org/schema/p"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">    <!-- 配置c3p0数据源 -->    <bean id="c3p0DataSource" destroy-method="close">        <property name="driverClass" value="com.mysql.jdbc.Driver"/>        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test" />        <property name="user" value="root" />        <property name="password" value="root" />        <property name="initialPoolSize" value="10" />        <property name="minPoolSize" value="5" />        <property name="maxPoolSize" value="30" />        <property name="acquireIncrement" value="10" />        <property name="maxIdleTime" value="10" />        <property name="maxStatements" value="0" />    </bean>    <!-- 配置SessionFactory，使用上面的c3p0数据源作为数据库连接 --><bean id="sqlSessionFactory" ref="c3p0DataSource"/></bean><!-- 声明式事务管理 --><bean id="transactionManager" ref="c3p0DataSource" />    </bean><!-- 配置Mapper，相当于dao --><bean id="personMapper" value="org.qiuqiu.dao.PersonMapper"/><property name="sqlSessionFactory" ref="sqlSessionFactory"/></bean></beans>

?上面的配置文件我就不多说了，一个是数据源，连接数据库用的，第二个是让Spring管理session用的，第三个是声明式事务，最后一个就是dao了。有一点必须注意，interface、mapper file、mapper namespace这三个必须对应（并不是完全一样，而是对应），正确的写法如下：interface：org.qiuqiu.dao.PersonMappermapper file：org/qiuqiu/dao/PersonMapper.xmlmapper namespace：org.qiuqiu.dao.PersonMapper这三个必须对应，否则会报以下错误：

 Exception in thread "main" java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for ...at org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:594)at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:436)at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:428)at org.apache.ibatis.binding.MapperMethod.setupCommandType(MapperMethod.java:188)at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:51)at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:37)at $Proxy5.selectByExample(Unknown Source)?

3.测试类，如下：

package org.qiuqiu.test;import java.util.List;import org.qiuqiu.dao.PersonMapper;import org.qiuqiu.vo.Person;import org.qiuqiu.vo.PersonExample;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class SpringTest {    public static void main(String[] args) {ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");PersonMapper pm = ctx.getBean("personMapper", PersonMapper.class);PersonExample example = new PersonExample();example.createCriteria().andAgeLessThan(10);List<Person> list = pm.selectByExample(example);for (Person p : list) {    System.out.println(p.getName() + "  " + p.getAge() + "  "+ p.getPassword());}    }}

?附件中会包含所有的jar包以及数据库表<if test="criteria.valid">
<trim prefix="(" suffix=")" prefixOverrides="and">
<foreach collection="criteria.criteria" item="criterion">
<choose>
<when test="criterion.noValue">
and ${criterion.condition}
</when>
<when test="criterion.singleValue">
and ${criterion.condition} #{criterion.value}
</when>
<when test="criterion.betweenValue">
and ${criterion.condition} #{criterion.value} and
#{criterion.secondValue}
</when>
<when test="criterion.listValue">
and ${criterion.condition}
<foreach collection="criterion.value" item="listItem"
open="(" close=")" separator=",">
#{listItem}
</foreach>
</when>
</choose>
</foreach>
</trim>
</if>
</foreach>
</where>
</sql>
<sql id="Update_By_Example_Where_Clause">
<!--
WARNING - @mbggenerated This element is automatically generated by
MyBatis Generator, do not modify. This element was generated on Thu
Sep 01 10:08:21 CST 2011.
-->
<where>
<foreach collection="example.oredCriteria" item="criteria"
separator="or">
<if test="criteria.valid">
<trim prefix="(" suffix=")" prefixOverrides="and">
<foreach collection="criteria.criteria" item="criterion">
<choose>
<when test="criterion.noValue">
and ${criterion.condition}
</when>
<when test="criterion.singleValue">
and ${criterion.condition} #{criterion.value}
</when>
<when test="criterion.betweenValue">
and ${criterion.condition} #{criterion.value} and
#{criterion.secondValue}
</when>
<when test="criterion.listValue">
and ${criterion.condition}
<foreach collection="criterion.value" item="listItem"
open="(" close=")" separator=",">
#{listItem}
</foreach>
</when>
</choose>
</foreach>
</trim>
</if>
</foreach>
</where>
</sql>
这两段是什么意思？<if test="criteria.valid">
<trim prefix="(" suffix=")" prefixOverrides="and">
<foreach collection="criteria.criteria" item="criterion">
<choose>
<when test="criterion.noValue">
and ${criterion.condition}
</when>
<when test="criterion.singleValue">
and ${criterion.condition} #{criterion.value}
</when>
<when test="criterion.betweenValue">
and ${criterion.condition} #{criterion.value} and
#{criterion.secondValue}
</when>
<when test="criterion.listValue">
and ${criterion.condition}
<foreach collection="criterion.value" item="listItem"
open="(" close=")" separator=",">
#{listItem}
</foreach>
</when>
</choose>
</foreach>
</trim>
</if>
</foreach>
</where>
</sql>
<sql id="Update_By_Example_Where_Clause">
<!--
WARNING - @mbggenerated This element is automatically generated by
MyBatis Generator, do not modify. This element was generated on Thu
Sep 01 10:08:21 CST 2011.
-->
<where>
<foreach collection="example.oredCriteria" item="criteria"
separator="or">
<if test="criteria.valid">
<trim prefix="(" suffix=")" prefixOverrides="and">
<foreach collection="criteria.criteria" item="criterion">
<choose>
<when test="criterion.noValue">
and ${criterion.condition}
</when>
<when test="criterion.singleValue">
and ${criterion.condition} #{criterion.value}
</when>
<when test="criterion.betweenValue">
and ${criterion.condition} #{criterion.value} and
#{criterion.secondValue}
</when>
<when test="criterion.listValue">
and ${criterion.condition}
<foreach collection="criterion.value" item="listItem"
open="(" close=")" separator=",">
#{listItem}
</foreach>
</when>
</choose>
</foreach>
</trim>
</if>
</foreach>
</where>
</sql>
这两段是什么意思？
顶起来 5 楼 xiegaolong 2012-06-25 狂顶，好博文，支持下