目录

一、基础工程搭建

二、代码模块

1.思路

 2.代码模块

        1.pojo层

        2mapper层

        3.mybatis配置

4.controller层

总结：

接下来直接运行项目，打开浏览器输入localhost：8080+对应的网址即可。

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一、基础工程搭建

   1.搭建一个springboot项目

2.勾选所需的依赖配置

 3.在yml文件中配置，连接数据库;以及整合mybatis的配置（数据库是事先准备好的，最后展示出来）

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: 123456
    url: jdbc:mysql://localhost:3306/1?useSSl=true&useUnicode=true&characterEncoding=Utf-8&serverTimezone=Asia/Shanghai
mybatis:
  mapper-locations: classpath:mybatis/mapper/*.xml
  type-aliases-package: com.jiang.pojo

4.在测试类中测试是否连接成功（test包下的）

//注入DataSource
    @Autowired
    private DataSource dataSource;
    @Test
    void contextLoads() {
        //输出数据源所在的类
        System.out.println(dataSource.getClass());
    }

5.连接成功

6.配置mybatis-springboot-start依赖，以及以后加载web的依赖（这里也可以在一开始创建的时候添加）

<!--非官方-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.2</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

二、代码模块

1.思路

pojo实体类->mapper接口->mybatis配置->controller层（此处省略了service层），目录结构如下：

 2.代码模块

        1.pojo层

students类

package com.jiang.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.stereotype.Component;

//此处事先添加了lombok插件
@Data
@AllArgsConstructor
@NoArgsConstructor
@Component
public class Students {
    private int sno;
    private String name;
    private String sex;
    private int age;
    private double number;
    private String classname;
}

classes类

package com.jiang.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.stereotype.Component;

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

//此处事先添加了lombok插件
@Data
@AllArgsConstructor
@NoArgsConstructor
@Component
public class Classes {
    private String classname;
    private String teacher;
    private String course;
    private Date date;
    private List<Students> students;
}

        2mapper层

StudentsMapper接口

package com.jiang.mapper;

import com.jiang.pojo.Students;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import java.util.List;

@Mapper//表示被mybatis整合
@Repository//装配bean
public interface StudentsMapper {
    //查询所有学生
    List<Students> selectStudents();
    //添加学生
    int addStudents(Students students);
    //删除学生
    int deleteStudents(int sno);
    //更新学生
    int updateStudents(Students students);
}

ClassesMapper接口

package com.jiang.mapper;

import com.jiang.pojo.Classes;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import java.util.List;

@Mapper
@Repository
public interface ClassesMapper {
    //查询所有课程
    List<Classes> selectClasses();
    //添加课程
    int addClasses (Classes classes);
    //删除课程
    int deleteClasses (String classname);
    //更新课程
    int updateClasses (Classes classes);
    //连接查询

}

        3.mybatis配置

StudentsMapper.xml

<?xml version="1.0" encoding="UTF8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.jiang.mapper.StudentsMapper">
    <select id="selectStudents" resultType="Students">
        select * from students
    </select>
    <insert id="addStudents" parameterType="Students">
        insert into students(sno,name,sex,age,number,classname) values (#{sno},#{name},#{sex},#{age},#{number},#{classname})
    </insert>
    <delete id="deleteStudents" parameterType="int">
        delete from students where sno=#{sno}
    </delete>
    <update id="updateStudents" parameterType="Students">
        update students set name=#{name},sex=#{sex},age=#{age},number=#{number},classname=#{classname} where sno=#{sno}
    </update>
</mapper>

ClassesMapper.xml

<?xml version="1.0" encoding="UTF8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.jiang.mapper.ClassesMapper">
    <select id="selectClasses" resultType="Classes">
        select * from classes
    </select>
    <insert id="addClasses" parameterType="Classes">
        insert into classes (classname,teacher,course,date) values (#{classname},#{teacher},#{course},#{date})
    </insert>
    <delete id="deleteClasses" parameterType="String">
        delete from classes where classname=#{classname}
    </delete>
    <update id="updateClasses" parameterType="Classes">
        update classes set teacher=#{teacher},course=#{course},date=#{date} classname=#{classname}
    </update>
</mapper>

4.controller层

StudentsController

package com.jiang.controller;


import com.jiang.mapper.StudentsMapper;
import com.jiang.pojo.Students;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

//装配bean
@RestController
public class StudentsController {
   //注入students接口
    @Autowired
    private StudentsMapper studentsMapper;
   //实现接口中的查询方法
    @GetMapping("/selectStudents")
    public List<Students> selectStudents(){
        List<Students> students = studentsMapper.selectStudents();
        for (Students student : students) {
            System.out.println(student);
        }
        return students;
    }
    //实现添加方法
    @GetMapping("/addStudents")
    public String addStudents(){
        studentsMapper.addStudents(new Students(111,"柳西娥","女",23,1310001001,"软件一班"));
        return "addOK!";
    }
    //实现删除方法
    @GetMapping("/deleteStudents")
    public String deleteStudents(){
        studentsMapper.deleteStudents(111);
        return "deleteOK!";
    }
    //实现更改方法
    @GetMapping("updateStudents")
    public String updateStudents(){
        studentsMapper.updateStudents(new Students(111,"柳西娥","女",23,1310001011,"软件一班"));
        return "updateOK!";
    }
}

ClassesController

package com.jiang.controller;

import com.jiang.mapper.ClassesMapper;
import com.jiang.mapper.StudentsMapper;
import com.jiang.pojo.Classes;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;

@RestController
public class ClassesController {
    @Autowired
    private ClassesMapper classesMapper;
    @Autowired
    private StudentsMapper studentsMapper;
    @GetMapping("/selectClasses")
    public List<Classes> selectClasses(){
        List<Classes> classes = classesMapper.selectClasses();
        for (Classes aClass : classes) {
            System.out.println(aClass);
        }
        return classes;
    }
    @GetMapping("/addClasses")
    public String addClasses(){
        classesMapper.addClasses(new Classes());
        return "addOK!";
    }
    @GetMapping("/deleteClasses")
    public String deleteClasses(){
        classesMapper.deleteClasses("软件二班");
        return "deleteOK!";
    }
    @GetMapping("/updateClasses")
    public String updateClasses(){
        classesMapper.updateClasses(new Classes());
        return "updateOK!";
    }
}

总结：

接下来直接运行项目，打开浏览器输入localhost：8080+对应的网址即可。