新增依賴：pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId
 
>gdou.laiminghai</groupId>
    <artifactId>springboot-mybatis-start</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springboot-mybatis-start</name>
    <description>Demo project for Spring Boot</description
 
>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.10.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
 


    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

配置：application.yml

#執行埠
server:
  port: 8081

#資料來源配置
spring:
  datasource:
    url: jdbc:mysql://localhost:3306/pre_worker?useUnicode=true&characterEncoding=utf8
    driver-class-name: com.mysql.jdbc.Driver
    username: root
    password: mysql
#列印SQL語句 
logging:
  level:
      gdou.laiminghai.mapper: debug

資料庫及實體類：

資料庫表格：

CREATE TABLE t_user(
  id BIGINT NOT NULL PRIMARY KEY AUTO_INCREMENT,
  name VARCHAR(255) ,
  password VARCHAR(255) ,
  phone VARCHAR(255)
)

實體類：

public class User {
    private Integer id;
    private String name;
    private String password;
    private String phone;
    //省略getter和setter方法
 }

Mapper編寫：UserMapper.java

@Mapper
public interface UserMapper {

    @Insert("INSERT INTO users2(NAME, PASSWORD, PHONE) VALUES(#{name}, #{password}, #{phone})")
    @Options(useGeneratedKeys = true,keyProperty = "id",keyColumn = "id")
    int insertByUser(User user);

    @Select("SELECT * FROM users2 WHERE PHONE = #{phone}")
    @Results(id = "userResult",value = {
            @Result(property = "id",column = "id"),
            @Result(property = "name",column = "name"),
            @Result(property = "password",column = "password"),
            @Result(property = "phone",column = "phone")
    })
    User findUserByPhone(@Param("phone") String phone);

    @Update("UPDATE users2 SET NAME = #{name}, PASSWORD = #{password} WHERE PHONE = #{phone}")
    void update(User user);

    @Delete("DELETE FROM users2 WHERE ID = #{id}")
    void delete(Integer id);

    @ResultMap("userResult")
    @Select("SELECT * FROM users2")
    List<User> findAll();
}

Controller編寫：UserController.java

@RestController
@RequestMapping("/user")
@SuppressWarnings("all")
public class UserController {

    @Autowired
    private UserMapper userMapper;

    @PostMapping("/")
    public User addUser(User user){
        userMapper.insertByUser(user);
        return user;
    }

    @GetMapping("/list/{phone}")
    public User findUserByPhone(@PathVariable("phone")String phone){
        return userMapper.findUserByPhone(phone);
    }

    @PatchMapping("/")
    public User updateUser(User user){
        userMapper.update(user);
        return userMapper.findUserByPhone(user.getPhone());
    }

    @DeleteMapping("/")
    public int deleteUser(int id){
        userMapper.delete(id);
        return id;
    }

    @GetMapping("/list/all")
    public List<User> findAll(){
        return userMapper.findAll();
    }
}

測試可使用Postman測試。