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_NAMEAS   "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());    }}

sample-ds.xml为数据源配置文件。

log日志：