Mybatis（基于SqlSessionTemplate的实现） + Spring 练习实战

mybatis学习篇：上次使用映射接口实现Mybatis，有不方便指出就是需要接口，且需要保证接口上不能存在其他的代理。这次通过SqlSessionTemplate基于模板类实现Mybatis，总的来说就是1.建立pojo类,sql映射文件，2.spring中装配，3.调用SqlSessionTemplate类访问数据库。这三个步骤：

一：sql映射文件
City.java

package com.suning.schema.mabatisInterface;  
  
import java.io.Serializable;  
  
public class City implements Serializable{  
      
    /** 
     */  
    private static final long serialVersionUID = 1L;  
    private String provinceCode;  
    private String cityCode;  
    private String cityName;  
      
    public String getProvinceCode() {  
        return provinceCode;  
    }  
    public void setProvinceCode(String provinceCode) {  
        this.provinceCode = provinceCode;  
    }  
    public String getCityCode() {  
        return cityCode;  
    }  
    public void setCityCode(String cityCode) {  
        this.cityCode = cityCode;  
    }  
    public String getCityName() {  
        return cityName;  
    }  
    public void setCityName(String cityName) {  
        this.cityName = cityName;  
    }  
}  

sqlMap_city.xml：

<?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="city">    
  <select id="selectCity" parameterType="java.lang.String"  resultType="City">    
    SELECT   
        PROVINCE_CODE   AS   "provinceCode",  
        CITY_CODE       AS   "cityCode",  
        CITY_NAME       AS   "cityName"  
    FROM  
        PUMS_CITY  C  
    WHERE    
        C.CITY_CODE = #{cityCode}   
  </select>    
</mapper>  

定义命名空间namespace为city,sql的ID为selectCity，其中resultType="city"，可以写全路径，也可以通过配置文件简写。
二：Spring中装配
sample-mybatis.xml

<?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:aop="http://www.springframework.org/schema/aop"  
    xmlns:tx="http://www.springframework.org/schema/tx"   
    xmlns:context="http://www.springframework.org/schema/context"  
    xmlns:mvc="http://www.springframework.org/schema/mvc"   
    xsi:schemaLocation="   
          http://www.springframework.org/schema/beans   
          http://www.springframework.org/schema/beans/spring-beans-3.0.xsd   
          http://www.springframework.org/schema/tx   
          http://www.springframework.org/schema/tx/spring-tx-3.0.xsd  
          http://www.springframework.org/schema/context   
          http://www.springframework.org/schema/context/spring-context-3.0.xsd   
          http://www.springframework.org/schema/aop   
          http://www.springframework.org/schema/aop/spring-aop-3.0.xsd  
          http://www.springframework.org/schema/mvc  
          http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd" >  
            
      
        <!--  autowised注解，注入Bean 等同 <context:component-scan base-package=”XX.XX”/>-->  
    <context:annotation-config />  
      
    <!-- 基于sqlSessionTemplate的mybatis配置 -->  
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">    
        <property name="dataSource" ref="dataSource" />    
        <property name="configLocation" value="classpath:conf/spring/mybatisConfig.xml"/>  
        <property name="mapperLocations" value="classpath:conf/sqlMapMybatis/sqlMap_city.xml"/>  
    </bean>  
      
    <!-- sqlSessionTemplate配置 -->  
    <bean id="sqlSession"    class="org.mybatis.spring.SqlSessionTemplate">     
        <constructor-arg index="0" ref="sqlSessionFactory" />     
    </bean>    
      
    <bean id="mybatisService" class="com.suning.mybatis.MybatisService">  
    </bean>  
</beans>  

定义一个核心的SqlSessionFactoryBean实例，mybatis的核心管理类，通过dataSource指定数据源，configLocation代表mybatis的配置文件，mapperLocations指sql文件地址。注入SqlSessionTemplate的实例，构造方法初始化sqlSessionFactory。定义业务的实现类mybatisService

三：调用sqlSessionTemplate
MybatisService.Java：

package com.suning.mybatis;  
  
import org.mybatis.spring.SqlSessionTemplate;  
import org.springframework.beans.factory.annotation.Autowired;  
  
//mabitis测试的业务类  
public class MybatisService {  
  
    @Autowired  
    private SqlSessionTemplate sqlSessionTemplate;  
      
    //获取市详情  
    public City getCityDetail(String cityCode){  
        return (City)sqlSessionTemplate.selectOne("city.selectCity", cityCode);  
    }  
} 

通过自动注解，注入sqlSessionTemplate。city对应sql中命名空间，selectCity对应sql的ID，如图：

测试类MybatisMain.java　　

package com.suning.mybatis;  
  
import org.springframework.beans.factory.BeanFactory;  
import org.springframework.context.support.ClassPathXmlApplicationContext;  
  
public class MybatisMain {  
  
    /** 
     * 功能描述: <br> 
     * 〈功能详细描述〉 
     *  
     * @param args 
     * @see [相关类/方法](可选) 
     * @since [产品/模块版本](可选) 
     */  
    public static void main(String[] args) {  
        BeanFactory factory = new ClassPathXmlApplicationContext(new String[] {  
                "classpath:conf/spring/sample-mybatis.xml", "classpath:conf/spring/sample-ds.xml" });  
        MybatisService test = (MybatisService) factory.getBean("mybatisService");  
        City cityDetail = (City) test.getCityDetail("560");  
        System.out.println("cityCode:560代表的城市为" + cityDetail.getCityName());  
    }  
  
}