SpringBoot整合mybatis

1. 首先在pom文件中导入Mybatis所需要的依赖

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.1</version>
</dependency>

2. 在application.yaml中配置相应的信息

spring:
  datasource:
    username: root
    password: 123456
    #?serverTimezone=UTC解决时区的报错
    url: jdbc:mysql://
    driver-class-name: com.mysql.cj.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource

这样基本的配置就完事了，接下来就需要测试了

3. 创建实体类

package com.bestrookie.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Department {
    private Integer id;
    private String departmentName;
}

4. 创建mapper目录以及对应的Mapper接口

//@Mapper : 表示本类是一个 MyBatis 的 Mapper
@Mapper
@Repository
public interface DepartmentMapper {
    // 获取所有部门信息
    List<Department> getDepartments();
    // 通过id获得部门
    Department getDepartment(Integer id);
}

5. 创建对应的Mapper映射文件（DepartmentMapper.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="com.bestrookie.mapper.DepartmentMapper">
    <select id="getDepartments" resultType="Department">
       select * from department;
    </select>
    <select id="getDepartment" resultType="Department" parameterType="int">
       select * from department where id = #{id};
    </select>
</mapper>

6. 这样就大功告成只需要创建Contronller类就可以调用相应的方法

@RestController
public class DepartmentController {
    @Autowired
    DepartmentMapper departmentMapper;
    // 查询全部部门
    @GetMapping("/getDepartments")
    public List<Department> getDepartments(){
        return departmentMapper.getDepartments();
    }
    // 查询全部部门
    @GetMapping("/getDepartment/{id}")
    public Department getDepartment(@PathVariable("id") Integer id){
        return departmentMapper.getDepartment(id);
    }    
}