在Spring3中使用MyBatis

1.MyBatis 例子

首先，單獨使用MyBatis時：

import java.io.IOException;
import java.io.Reader;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
public class MyBatisUtil {
 // 每一個MyBatis的應用程序都以一個SqlSessionFactory對象的實例為核心
 // 使用SqlSessionFactory的最佳實踐是在應用運行期間不要重復創建多次,最佳范圍是應用范圍
 private final static SqlSessionFactory sqlSessionFactory;
 static {
  String resource = "configuration.xml";
  Reader reader = null;
  try {
   reader = Resources.getResourceAsReader(resource);
  } catch (IOException e) {
   System.out.println(e.getMessage());
  }
  // SqlSessionFactory對象的實例可以通過SqlSessionFactoryBuilder對象來獲得
  // SqlSessionFactoryBuilder實例的最佳范圍是方法范圍（也就是本地方法變量）。
  sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
 }
 public static SqlSessionFactory getSqlSessionFactory() {
  return sqlSessionFactory;
 }
}

<?xml version="1.0" encoding="UTF-8" ?> 
<!DOCTYPE mapper 
    PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" 
    "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 
<mapper namespace="Mapper.UserMapper"> 
<!-- 這里namespace必須是UserMapper接口的路徑，不然要運行的時候要報錯 “is not known to the MapperRegistry”--> 
    <insert id="insertUser" parameterType="User"> 
       insert into vincent_user(name,age) values(#{name},#{age}) 
       <!-- 這里sql結尾不能加分號，否則報“ORA-00911”的錯誤 --> 
    </insert> 

    <!-- 這里的id必須和UserMapper接口中的接口方法名相同，不然運行的時候也要報錯 --> 
    <select id="getUser" resultType="User" parameterType="java.lang.String"> 
        select * from vincent_user where name=#{name} 
    </select> 
</mapper> 

import org.apache.ibatis.session.SqlSession; 
import org.apache.ibatis.session.SqlSessionFactory; 
import org.junit.Test; 

public class TestMapper { 
    static SqlSessionFactory sqlSessionFactory = null; 
    static { 
       sqlSessionFactory = MyBatisUtil.getSqlSessionFactory(); 
    } 

    @Test 
    public void testAdd() { 
       SqlSession sqlSession = sqlSessionFactory.openSession(); 
       try { 
           UserMapper userMapper = sqlSession.getMapper(UserMapper.class); 
           User user = new User("tom",new Integer(5)); 
           userMapper.insertUser(user); 
           sqlSession.commit();//這里一定要提交，不然數據進不去數據庫中 
       } finally { 
           sqlSession.close(); 
       } 
    } 

    @Test 
    public void getUser() { 
       SqlSession sqlSession = sqlSessionFactory.openSession(); 
       try { 
           UserMapper userMapper = sqlSession.getMapper(UserMapper.class); 
           User user = userMapper.getUser("jun"); 
           System.out.println("name: "+user.getName()+"|age: "+user.getAge()); 
       } finally { 
           sqlSession.close(); 
       } 
    } 

} 

2.整合Spring3后，單獨使用Mybatis

首先，Spring3配置文件中（applicationContext.xml）有：

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> 
        <property name="configLocation" value="classpath:ibatis-config.xml" /> 
        <property name="dataSource" ref="dataSource" /> 
        <!-- mapper和resultmap配置路徑 -->
        <property name="mapperLocations">
     <list>
         <value>classpath:com/log/bean/mapper/*.xml</value>
         </list>
        </property>
</bean>

<!-- 通過掃描的模式，掃描目錄在com/log/bean/mapper目錄下，所有的mapper都繼承
            SQLMapper接口的接口， 這樣一個bean就可以了 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.log.bean.mapper"/>
    <property name="markerInterface" value="com.log.bean.mapper.SQLMapper"/>
</bean>

工具類：

import org.apache.ibatis.session.SqlSessionFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

public class MyBatisUtil  {   

    private  final static SqlSessionFactory sqlSessionFactory;   

    static {   
        ApplicationContext ac = new FileSystemXmlApplicationContext("classpath:applicationContext.xml"); 
        sqlSessionFactory = (SqlSessionFactory)ac.getBean("sqlSessionFactory"); 
    }   

    public static SqlSessionFactory getSqlSessionFactory() {   
       return sqlSessionFactory;   
    }   
}