Spring集成MyBatis的使用-使用SqlSessionTemplate

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:util="http://www.springframework.org/schema/util"  
    xmlns:jee="http://www.springframework.org /schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa" xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">    
              
        <!-- 配置连接池 -->               
        <!-- 读取属性文件 -->
        <util:properties id="db" location="classpath:config.properties">    
        </util:properties>
        <!-- 配置连接池,可以参考DBUtil的方法，这里采用spring创建连接池-->
        <!-- destroy-method方法作用是：当spring容器关闭后，会将连接释放回到连接池，避免资源浪费 -->
        <bean id="ds" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
         <property name="driverClassName" value="#{db.driver}"/>
         <property name="url" value="#{db.url}" />
         <property name="username" value="#{db.user}" />
         <property name="password" value="#{db.pwd}" />
        </bean>
        
        <!-- 配置SqlSessionFactoryBean -->
        <bean id="ssfb" class="org.mybatis.spring.SqlSessionFactoryBean">
         <!-- 指定连接资源 -->
         <property name="dataSource" ref="ds"/>
         <!-- 指定映射文件:entity包下的所有后缀xml的映射文件 -->
         <property name="mapperLocations" value="classpath:entity/*.xml"/>
        </bean>
        
        <!-- 配置SqlSessionTemplate -->
        <bean id="sst" class="org.mybatis.spring.SqlSessionTemplate">
         <!-- 采用构造器方式注入SqlSessionFactoryBean,注入第一个参数 -->
         <constructor-arg index="0" ref="ssfb"></constructor-arg>
        </bean>
                
        <!-- 配置组件扫描 -->
        <context:component-scan base-package="dao"></context:component-scan>
</beans>

<?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="newname"><!-- 如果不是采用Mapper映射器，命名空间随便写，不做要求 -->
  <!-- id要求唯一 
       parameterType:填写实体类的完整名字
  -->
  <!-- 插入语句 -->
  <insert id="save" parameterType="entity.Employee">
   INSERT INTO T_TABLE VALUES(6,#{name},#{age})
  </insert>
  <!-- 根据id查询语句 -->
  <select id="findByID" parameterType="int" resultType="entity.Employee">
   SELECT * FROM T_TABLE WHERE ID=#{id}
  </select>
  <!-- 查询所有结果,不需要参数类型 -->
  <select id="findAll" resultType="entity.Employee">
  SELECT * FROM T_TABLE
  </select>
  <!-- 修改操作 -->
  <update id="modify" parameterType="entity.Employee">
  UPDATE T_TABLE SET NAME=#{name},AGE=#{age} WHERE ID=#{id}
  </update>
  <!-- 删除操作 -->
  <delete id="delete" parameterType="int">
  DELETE FROM T_TABLE WHERE ID=#{ididid} 
  </delete>
  
  <!-- 返回map类型的结果 -->
  <!-- 也可以将返回结果简写成map，map即为java.util.Map -->
  <select id="findOne" parameterType="int" resultType="java.util.Map">
   SELECT * FROM T_TABLE WHERE ID=#{id}
  </select>
  
  <!-- 使用resultMap解决表的字段名和实体类的属性名不一致的情况 -->
  <resultMap id="resultMapID" type="entity.NewEmployee">
    <result property="empID" column="id" />
    <result property="empName" column="name" />
    <result property="empAge" column="age" />
  </resultMap>
  
  <select id="findOneByNewEmp" parameterType="int" resultMap="resultMapID">
  SELECT * FROM T_TABLE WHERE ID=#{id}
  </select>
  
</mapper>

import java.util.List;
import java.util.Map;
import org.springframework.stereotype.Repository;
import entity.Employee;
import entity.NewEmployee;
/**
 * Mapper映射器，接口方法不一定跟EmpMapper.xml中写的sql的id一致，本例中没有修改
 * @author clyang
 */
public interface EmployeeDAO {
    
    //将一条数据插入数据库
    public void save(Employee e);
    //查询所有结果
    public List<Employee> findAll();
    //根据id来查找结果
    public Employee findByID(int id);
    //修改操作
    public void modify(Employee e);
    //删除操作
    public void delete(int id);
    //返回类型为map的查询，根据id来查询
    public Map findOne(int id);
    //当表的字段名和实体类的属性名不一致时，根据id来查询
    public NewEmployee findOneByNewEmp(int id);
    
}

import java.util.List;
import java.util.Map;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Repository;
import entity.Employee;
import entity.NewEmployee;
@Repository("empDAO")
public class EmployeeDAOImpl implements EmployeeDAO{
    
    //注入SqlsessionTemplate
    @Autowired
    @Qualifier("sst")
    private SqlSessionTemplate sst;
    /**
     * 不用考虑提交事务和关闭SqlSession，SqlSessionTemplate为线程安全接口
     */
    public void save(Employee e) {
        sst.insert("newname.save",e);        
    }

    public List<Employee> findAll() {
        return sst.selectList("newname.findAll");
    }

    public Employee findByID(int id) {
        return sst.selectOne("newname.findByID", id);
    }

    public void modify(Employee e) {
        sst.update("newname.modify", e);        
    }

    public void delete(int id) {
        sst.delete("newname.delete",id);        
    }

    public Map findOne(int id) {
      return sst.selectOne("newname.findOne",id);
    }

    public NewEmployee findOneByNewEmp(int id) {
        return sst.selectOne("newname.findOneByNewEmp",id);
    }
}

import java.util.List;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import dao.EmployeeDAO;
import entity.Employee;

public class testCase {
    @Test
    public void test1() {
        //启动spring容器
        String config="spring-mybatis.xml";
        ApplicationContext ac=new ClassPathXmlApplicationContext(config);
        //调用EmployeeDAOImpl实现类,使用父类接口指向子类对象
        EmployeeDAO dao=ac.getBean("empDAO",EmployeeDAO.class);
        //调用查询方法
        List<Employee> list=dao.findAll();
        System.out.println(list);
        //不需要手动关闭连接
    }
}