Springboot整合mybatis的步骤

        <!--   mybatis整合     -->
        <dependency>
        <groupid>org.mybatis.spring.boot</groupid>
            <artifactid>mybatis-spring-boot-starter</artifactid>
            <version>2.1.4</version>
        </dependency>

spring:
  datasource:
    username: root
    password: 123456
    url: jdbc:mysql://localhost:3306/mybatis?servertimezone=utc&useunicode=true&characterencoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.driver

package com.example.pojo;

import lombok.allargsconstructor;
import lombok.data;
import lombok.noargsconstructor;

@data
@allargsconstructor
@noargsconstructor
public class user {
    private integer id;
    private string name;
    private string pwd;

}

        <!-- lombok     -->
        <dependency>
            <groupid>org.projectlombok</groupid>
            <artifactid>lombok</artifactid>
        </dependency>

package com.example.mapper;

import com.example.pojo.user;
import org.apache.ibatis.annotations.mapper;
import org.springframework.stereotype.repository;

import java.util.list;

@mapper
@repository
public interface usermapper {
    //查询用户的全部信息
    list<user> getuserlist();

    //select 找出id=1的用户
    user getuserbyid(int id);

    //insert 增加一个用户
    int insertuser(user user);

    //delete 删除id=4的用户
    int deleteuser(int id);

    //update 将id=2的用户名字改为小龙
    int updateuser(user user);

}

<?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.example.mapper.usermapper">
    <select id="getuserlist" resulttype="user">
        select *
        from mybatis.user
    </select>

    <select id="getuserbyid" resulttype="user" parametertype="int">
        select *
        from mybatis.user
        where id = #{id};
    </select>

    <insert id="insertuser" parametertype="user">
        insert into mybatis.user (id, name, pwd)
        values (#{id}, #{name}, #{pwd});
    </insert>

    <delete id="deleteuser" parametertype="int">
        delete
        from mybatis.user
        where id = #{id};
    </delete>

    <update id="updateuser" parametertype="user">
        update mybatis.user
        set name = #{name},
            pwd = #{pwd}
        where id = #{id};
    </update>

</mapper>

mybatis:
  type-aliases-package: com.example.pojo
  mapper-locations: classpath:mybatis/mapper/*.xml

package com.example.controller;

import com.example.mapper.usermapper;
import com.example.pojo.user;
import org.apache.ibatis.annotations.param;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.web.bind.annotation.getmapping;
import org.springframework.web.bind.annotation.pathvariable;
import org.springframework.web.bind.annotation.restcontroller;

import java.util.list;

@restcontroller
public class usercontroller {

    @autowired
    private usermapper usermapper;

    @getmapping("/getuserlist")
    public list<user> getuserlist(){
        return usermapper.getuserlist();
    }

    @getmapping("/getuserbyid/{id}")
    public user getuserbyid(@pathvariable("id") int id){
        return usermapper.getuserbyid(id);
    }

    @getmapping("/insertuser")
    public string insertuser(){
        usermapper.insertuser(new user(5,"xiaoming","111"));
        return "ok";
    }

    @getmapping("/deleteuser")
    public string deleteuser(){
        usermapper.deleteuser(5);
        return "ok";
    }

    @getmapping("/updateuser")
    public string updateuser(){
        usermapper.updateuser(new user(5,"xx","111"));
        return "ok";
    }

}