官方文档：

https://mybatis.org/mybatis-3/zh/getting-started.html

SpringBoot整合Mybatis 引入maven依赖

（IDEA建项目的时候直接选就可以了）

<dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.1.4</version></dependency>

配置application.yml文件

server: port: 8144spring: #redis redis: host: 127.0.0.1 port: 6379 password: 123456 timeout: 3000 datasource: username: root password: root driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://localhost:3306/hellomybatis?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8

建实体类、Controller类、Service类 实体类

package com.example.mybatisDemo.entity;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;@Data@NoArgsConstructor@AllArgsConstructorpublic class User { private long id; private String name; private String pwd;}

Controller类

package com.example.mybatisDemo.controller;import com.example.mybatisDemo.entity.User;import com.example.mybatisDemo.service.UserService;import org.springframework.web.bind.annotation.*;import java.util.*;@RestController@RequestMapping("api/user")public class UserController { private final UserService userService; public UserController(UserService userService) { this.userService = userService; } @GetMapping() public List<User> getAllUsers(){ return userService.getUsers(); } @DeleteMapping("{id}") public int deleteUser(@PathVariable long id){ return userService.deleteUser(id); } @PostMapping public int saveUser(@RequestBody User user){ return userService.insertUser(user); } @PutMapping public int updateUser(@RequestBody User user){ return userService.updateUser(user); } @GetMapping("{id}") public User getUser(@PathVariable long id){ return userService.getUser(id); }}

Service类

package com.example.mybatisDemo.service;import com.example.mybatisDemo.entity.User;import com.example.mybatisDemo.repository.UserRepository;import org.springframework.stereotype.Service;import java.util.*;@Servicepublic class UserService { private final UserRepository userRepository; public UserService(UserRepository userRepository) { this.userRepository = userRepository; } public List<User> getUsers(){ return userRepository.getUsers(); } public int deleteUser(long id){ return userRepository.deleteUser(id); } public User getUser(long id){ return userRepository.getUser(id); } public int updateUser(User user){ return userRepository.updateUser(user); } public int insertUser(User user){ return userRepository.addUser(user); }}

建Repository类

package com.example.mybatisDemo.repository;import com.example.mybatisDemo.entity.User;import org.apache.ibatis.annotations.*;import org.springframework.stereotype.Repository;import java.util.*;/** * Mapper注解能省去以前复杂的xml配置，直接用注解写sql语句 * 不添加Repository注解依赖注入会报错（不影响运行），强迫症还是加上吧 */@Mapper@Repositorypublic interface UserRepository { @Select("select * from user") List<User> getUsers(); @Delete("delete from user where id = #{id}") int deleteUser(long id); @Insert("insert into user(id,name,pwd) values (#{id},#{name},#{pwd})") int addUser(User user); @Update("update user set name=#{name},pwd=#{pwd} where id = #{id}") int updateUser(User user); @Select("select * from user where id = #{id}") User getUser(long id);}

然后直接调用即可

这里有个问题，使用注解开发的话sql语句全写在注解里，那么如果要实现批量更新插入要怎么写呢，目前还没解决，找到办法再更

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