在Spring3中使用MyBatis

Mybatis Spring3

1.MyBatis 例子

首先，单独使用MyBatis时：

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 { // 每一个MyBatis的应用程序都以一个SqlSessionFactory对象的实例为核心 // 使用SqlSessionFactory的最佳实践是在应用运行期间不要重复创建多次,最佳范围是应用范围 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对象的实例可以通过SqlSessionFactoryBuilder对象来获得  // SqlSessionFactoryBuilder实例的最佳范围是方法范围（也就是本地方法变量）。  sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader); } public static SqlSessionFactory getSqlSessionFactory() {  return sqlSessionFactory; }}

配置文件：

<?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"> <!-- 这里namespace必须是UserMapper接口的路径，不然要运行的时候要报错 “is not known to the MapperRegistry”-->     <insert id="insertUser" parameterType="User">        insert into vincent_user(name,age) values(#{name},#{age})        <!-- 这里sql结尾不能加分号，否则报“ORA-00911”的错误 -->     </insert>      <!-- 这里的id必须和UserMapper接口中的接口方法名相同，不然运行的时候也要报错 -->     <select id="getUser" resultType="User" parameterType="java.lang.String">         select * from vincent_user where name=#{name}     </select> </mapper> 

使用的测试类为：

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();//这里一定要提交，不然数据进不去数据库中        } 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，单独使用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配置路径 -->    <property name="mapperLocations"><list><value>classpath:com/log/bean/mapper/*.xml</value>    </list>    </property></bean>

<!-- 通过扫描的模式，扫描目录在com/log/bean/mapper目录下，所有的mapper都继承SQLMapper接口的接口， 这样一个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>

工具类：

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;       }   }