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());
}

}

sample-ds.xml为数据源配置文件。

log日志：