spring入门(六) spring mvc+mybatis

时间：2022-01-25 20:56:08

1.引入依赖

 <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->

 <dependency>

     <groupId>org.mybatis</groupId>

     <artifactId>mybatis</artifactId>

     <version>3.4.5</version>

 </dependency>

 <!--spring的版本是5.0.9,mybatis-spring的版本要是1.3+ -->

 <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->

 <dependency>

     <groupId>org.mybatis</groupId>

     <artifactId>mybatis-spring</artifactId>

     <version>1.3.2</version>

 </dependency>

2.在springmvc-config.xml增加mybatis配置

 <!-- 针对myBatis的配置项 -->

 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

     <!-- 实例化sqlSessionFactory时需要使用上述配置好的数据源以及SQL映射文件 -->

     <property name="dataSource" ref="dataSource" />

     <!-- 自动扫描classpath:mapper/*.xml         -->

     <property name="mapperLocations" value="classpath:mapper/*.xml" />

 </bean>

 <!-- 配置扫描器 -->

 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">

     <!-- 扫描com.ice.dao这个包以及它的子包下的所有映射接口类,省去了在每个mapper接口上注解 -->

     <property name="basePackage" value="com.ice.dao" />

     <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />

 </bean>

3.在classpath:mapper/ 创建CustomerMapper.xml

注意创建的位置,是在上面设置的 mapperLocations.

 <?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">

 <!--  namespace要跟后面该xml对应的mapper类的全名一致 -->

 <mapper namespace="com.ice.dao.CustomerMapper">

     <!--  id设置为mapper类对应的方法名, parameterType跟方法的参数类型一致,resultType跟方法的返回类型一致.

     如果返回单个对象,mybatis会自动调用selectOne方法;如果返回的是List,mybatis会自动调用selectList方法.

     -->

     <select id="getUser" parameterType="java.lang.String"

             resultType="com.ice.model.Customer">

         select id,name from customer where name=#{name}

     </select>

 </mapper>

4.创建CustomerMapper.xml对应的CustomerMapper.java

注意创建的位置,是在上面设置的 basePackage.

 package com.ice.dao;

 import com.ice.model.Customer;

 //不用在xml里配置该bean,也不用注解.已经配置了MapperScanner

 //<property name="basePackage" value="com.ice.dao" />

 public interface CustomerMapper {

     Customer getUser(String name);

 }

5.简单测试(在controller里测试,也可考虑springTest)

正式项目里,要有service层.

 package com.ice.controller;

 import com.ice.dao.CustomerMapper;

 import com.ice.model.Customer;

 import org.springframework.beans.factory.annotation.Autowired;

 import org.springframework.stereotype.Controller;

 import org.springframework.web.bind.annotation.RequestMapping;

 import org.springframework.web.bind.annotation.ResponseBody;

 @Controller

 @RequestMapping("/mybatis")

 public class MybatisController {

     @Autowired

     private CustomerMapper customerMapper;

     @RequestMapping("/query")

     @ResponseBody

     public String index() {

         Customer user = customerMapper.getUser("hello");

         return "顾客id" + user.getId();

     }

 }

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