spring与mybatis三种整合方法

[url]http://blog.youkuaiyun.com/skylovedaim/article/details/18553081[/url]
本文主要介绍Spring与Mybatis三种常用整合方法，需要的整合架包是mybatis-spring.jar，可通过链接
http://code.google.com/p/mybatis/下载到。

[color=red][b] 1、采用数据映射器（MapperFactoryBean）的方式[/b][/color]，不用写mybatis映射文件，采用注解方式提供相应的sql语句和输入参数。


（1）Spring配置文件：

   <!-- 引入jdbc配置文件 -->      

 <context:property-placeholder location="jdbc.properties"/>          

 <!--创建jdbc数据源 -->        

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">         

 <property name="driverClassName" value="${driver}"/>        

  <property name="url" value="${url}"/>         

 <property name="username" value="${username}"/>         

 <property name="password" value="${password}"/>          

<property name="initialSize" value="${initialSize}"/>          

<property name="maxActive" value="${maxActive}"/>       

   <property name="maxIdle" value="${maxIdle}"/>          

<property name="minIdle" value="${minIdle}"/>       

 </bean>        

  <!-- 创建SqlSessionFactory，同时指定数据源-->       

 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">        

 <property name="dataSource" ref="dataSource" />         

</bean>         

  <!--创建数据映射器，数据映射器必须为接口-->  

      <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">        

 <property name="mapperInterface" value="com.xxt.ibatis.dbcp.dao.UserMapper" />       

  <property name="sqlSessionFactory" ref="sqlSessionFactory" />        

 </bean>         

 <bean id="userDaoImpl2" class="com.xxt.ibatis.dbcp.dao.impl.UserDaoImpl2">       

 <property name="userMapper" ref="userMapper"/>  

 </bean>

数据映射器UserMapper,代码如下:

public interface UserMapper {     
    @Select("SELECT * FROM user WHERE id = #{userId}")        
  User getUser(@Param("userId") long id);   
 }  

dao接口类UserDao，代码如下：

public interface UserDao {   
    public User getUserById(User user);  
 }  

dao实现类UserDaoImpl2,，代码如下:

public class UserDaoImpl2 implements UserDao {   
     private UserMapper userMapper;      
     public void setUserMapper(UserMapper userMapper) {       
      this.userMapper = userMapper;      
   }         
   public User getUserById(User user) {      
     return userMapper.getUser(user.getId());      
   }  
  }  

[color=red][b]2、采用接口org.apache.ibatis.session.SqlSession的实现类[/b][/color]org.mybatis.spring.SqlSessionTemplate。
mybatis中, sessionFactory可由SqlSessionFactoryBuilder.来创建。

MyBatis-Spring 中，使用了SqlSessionFactoryBean来替代。
SqlSessionFactoryBean有一个必须属性dataSource，
另外其还有一个通用属性configLocation（用来指定mybatis的xml配置文件路径）。
（1）Spring配置文件：

<!-- 创建SqlSessionFactory，同时指定数据源-->  
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">     
 <property name="dataSource" ref="dataSource" />     
 <!-- 指定sqlMapConfig总配置文件，订制的environment在spring容器中不在生效-->   
 <property  name="configLocation"  value="classpath:sqlMapConfig.xml"/>   
 <!--指定实体类映射文件，可以指定同时指定某一包以及子包下面的所有配置文件，mapperLocations和configLocation有一个即可，当需要为实体类指定别名时，可指定configLocation属性，再在mybatis总配置文件中采用mapper引入实体类映射文件 -->  
  <!- - <property  name="mapperLocations"  value="classpath*:com/xxt/ibatis/dbcp/**/*.xml"/>  -->
 <bean>

(2)mybatis总配置文件sqlMapConfig.xml：

<configuration>    
 <typeAliases>     
  <typeAlias type="com.xxt.ibatis.dbcp.domain.User" alias="User" />   
 </typeAliases>     
<mappers>      
  <mapper resource="com/xxt/ibatis/dbcp/domain/user.map.xml" />      
 </mappers>  
 </configuration> 

(3)实体类映射文件user.map.xml:

<mapper namespace="com.xxt.ibatis.dbcp.domain.User">       
 <resultMap type="User" id="userMap">         
  <id property="id" column="id" />        
   <result property="name" column="name" />        
   <result property="password" column="password" />      
     <result property="createTime" column="createtime" />     
   </resultMap>     
   <select id="getUser" parameterType="User" resultMap="userMap">     
     select * from user where id = #{id}        
</select>  
 <mapper/> 

(4)dao层接口实现类UserDaoImpl：

public class UserDaoImpl implements  UserDao  {  
    public SqlSessionTemplate sqlSession;    
      public User getUserById(User user) {     
     return (User)sqlSession.selectOne("com.xxt.ibatis.dbcp.domain.User.getUser", user); 
     }  
    public void setSqlSession(SqlSessionTemplate sqlSession) {       
    this.sqlSession = sqlSession;      }  
  }  

附加MyBatis SqlMapConfig.xml例子

<!DOCTYPE configuration
    PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>

  <settings>
    <setting name="useGeneratedKeys" value="false"/>
  </settings>

  <!-- Use type aliases to avoid typing the full classname every time. -->
  <typeAliases>
    <typeAlias alias="Order" type="org.apache.camel.example.mybatis.Order"/>
  </typeAliases>

  <!-- setup environment with JDBC data source -->
  <environments default="development">
    <environment id="development">
      <transactionManager type="JDBC"/>
      <dataSource type="POOLED">
        <property name="driver" value="org.apache.derby.jdbc.EmbeddedDriver"/>
        <property name="url" value="jdbc:derby:memory:mybatis;create=true"/>
      </dataSource>
    </environment>
  </environments>

  <!-- mapping files -->
  <mappers>
    <mapper resource="org/apache/camel/example/mybatis/Order.xml"/>
  </mappers>

</configuration>

[color=red]使用mapperLocations属性错误[/color]: Error parsing Mapper XML
可能解决方式1: [url]http://www.cnblogs.com/huanmieuroshui/archive/2012/12/18/2822754.html[/url]
可能解决方式2: <property name="mapperLocations" value="classpath:com/pandy/app/bean/mapper/*Mapper.xml" />, 这个属性是直接扫描Mapper.xml文件, 而不是查找SqlMapConfig.xml文件.


[color=red][b]3、采用抽象类org.mybatis.spring.support.SqlSessionDaoSupport提供SqlSession。[/b][/color]

(1)spring配置文件:

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">      
 <property name="dataSource" ref="dataSource" />     
 <property  name="configLocation"  value="classpath:sqlMapConfig.xml"/>     
 <!-- <property  name="mapperLocations"  value="classpath*:com/xxt/ibatis/dbcp/domain/user.map.xml"/   >  -->   
</bean>    
  <bean id="sqlSession"     class="org.mybatis.spring.SqlSessionTemplate">         
 <constructor-arg index="0" ref="sqlSessionFactory" />   
 </bean>    
 <bean id="userDaoImpl3" class="com.xxt.ibatis.dbcp.dao.impl.UserDaoImpl3">     
 <!--注入SqlSessionTemplate实例 -->      
<property name="sqlSessionTemplate" ref="sqlSession" />     
  <!--也可直接注入SqlSessionFactory实例，二者都指定时，SqlSessionFactory失效 -->     
 <!-- <property name="sqlSessionFactory" ref="sqlSessionFactory" />    -->  
 </bean> 

(2) dao层接口实现类UserDaoImpl3：

public class UserDaoImpl3 extends SqlSessionDaoSupport implements UserDao {  
   public User getUserById(User user) {     
   return (User) getSqlSession().selectOne("com.xxt.ibatis.dbcp.domain.User.getUser", user);     
} 
  }