Spring-boot教程（三）整合mybatis

一、前言

建立一个简单的maven 项目，加入以下pom依赖

<dependencies>
       
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.2.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
    </dependencies>

二、配置application.properties

# mysql
spring.datasource.url=jdbc:mysql://localhost/springboot?useUnicode=true&characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver


mybatis.mapper-locations=classpath:mybatis/*.xml

***mybatis.mapper-locations=classpath:mybatis/*.xml 表示扫描mybatis目录下所有xml文件作为mapper

三、配置mapper

• namespace="com.wqc.mapper.UserMapper" 必须指向mappper接口的全类名

• 

<?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="com.wqc.mapper.UserMapper">

    <resultMap type="com.wqc.model.User" id="userMap">
        <id column="id" property="id" />
        <result column="user_name" property="userName" />
        <result column="pass_word" property="passWord" />
        <result column="create_time" property="createTime" />
    </resultMap>

    <select id="getUsers" resultType="com.wqc.model.User"
        resultMap="userMap">
        select * from users
    </select>

    <select id="update" parameterType="com.wqc.model.User">
        update users set
        user_name=#{userName},pass_word=#{passWord},create_time=#{createTime}
        where
        id=#{id}
    </select>
    
    <select id="del" parameterType="java.lang.Integer">
        delete from users where id=#{id}
    </select>
    
    <select id="save" parameterType="com.wqc.model.User">
        insert into users(user_name,pass_word,create_time) values(#{userName},#{passWord},#{createTime})
    </select>

</mapper>

四、编写mapper接口

package com.wqc.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Options;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import org.apache.ibatis.type.JdbcType;

import com.wqc.model.User;

@Mapper
public interface UserMapper {

    List<User> getUsers();

    void update(User user);

    void del(@Param("id")int id);

    void save(User user);

}

五、编写controller

package com.wqc.controller;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

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;

import com.wqc.model.User;
import com.wqc.mapper.UserMapper;

@Controller
@RequestMapping(value = "/")
public class UserController {

    @Autowired
    private UserMapper userMapper;
    
    @RequestMapping(value="/users")
    @ResponseBody
    public List<User> getUsers() {

        List<User> userList = userMapper.getUsers();
        return userList;
    }

    @ResponseBody
    @RequestMapping(value="/update")
    public List<User> update() {
        User user=new User();
        user.setId(1);
        user.setUserName("updateName");
        user.setPassWord("123");
        user.setCreateTime(new Date());
        userMapper.update(user);
        return userMapper.getUsers();
            }
    
    @ResponseBody
    @RequestMapping(value="/del")
    public List<User> del(){
        userMapper.del(1);
        return userMapper.getUsers();
    }
    
    @ResponseBody
    @RequestMapping(value="add")
    public List<User> add(){
		User user=new User();
        user.setUserName("test");
        user.setPassWord("111");
        user.setCreateTime(new Date());
        
        userMapper.save(user);
        return userMapper.getUsers();
    }
    
}

六、启动类

@SpringBootApplication
@MapperScan("com.wqc.mapper") //如果每个mapper文件自带了@Mapper,则这里可以不写
public class Application {

	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
	}
}