Mybatis（基於SqlSessionTemplate的實現） + Spring 練習實戰

mybatis學習篇：上次使用映射接口實現Mybatis，有不方便指出就是須要接口，且須要保證接口上不能存在其餘的代理。此次經過SqlSessionTemplate基於模板類實現Mybatis，總的來講就是1.創建pojo類,sql映射文件，2.spring中裝配，3.調用SqlSessionTemplate類訪問數據庫。這三個步驟：

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>

定義命名空間namespace爲city,sql的ID爲selectCity，其中resultType="city"，能夠寫全路徑，也能夠經過配置文件簡寫。
二：Spring中裝配
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註解，注入Bean 等同 <context:component-scan base-package=」XX.XX」/>-->  
    <context:annotation-config />  
      
    <!-- 基於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>

定義一個核心的SqlSessionFactoryBean實例，mybatis的核心管理類，經過dataSource指定數據源，configLocation表明mybatis的配置文件，mapperLocations指sql文件地址。注入SqlSessionTemplate的實例，構造方法初始化sqlSessionFactory。定義業務的實現類mybatisService

三：調用sqlSessionTemplate
MybatisService.Java：

package com.suning.mybatis;  
  
import org.mybatis.spring.SqlSessionTemplate;  
import org.springframework.beans.factory.annotation.Autowired;  
  
//mabitis測試的業務類  
public class MybatisService {  
  
    @Autowired  
    private SqlSessionTemplate sqlSessionTemplate;  
      
    //獲取市詳情  
    public City getCityDetail(String cityCode){  
        return (City)sqlSessionTemplate.selectOne("city.selectCity", cityCode);  
    }  
}

經過自動註解，注入sqlSessionTemplate。city對應sql中命名空間，selectCity對應sql的ID，如圖：

測試類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> 
     * 〈功能詳細描述〉 
     *  
     * @param args 
     * @see [相關類/方法](可選) 
     * @since [產品/模塊版本](可選) 
     */  
    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表明的城市爲" + cityDetail.getCityName());  
    }  
  
}