spring boot集成mybatis（注解模式）

一.所需材料

spring boot、mybatis

pom文件配置如下：

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.0</version>
        <relativePath/> <!-- lookup parent from repository -->
</parent>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.1</version>
        </dependency>
    </dependencies>

二.项目目录结构

三.项目代码

UserEntity.java

public class UserEntity implements Serializable {

    private Long id;

    private String name;

    private Integer age;

    private Byte status;

    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
    private Date createTime;

    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
    private Date updateTime;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Byte getStatus() {
        return status;
    }

    public void setStatus(Byte status) {
        this.status = status;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    public Date getUpdateTime() {
        return updateTime;
    }

    public void setUpdateTime(Date updateTime) {
        this.updateTime = updateTime;
    }

}

UserMapper.java

@Mapper
public interface UserMapper {

    @Select("SELECT id, user_name AS name, age, status, create_time AS createTime, update_time AS updateTime FROM user WHERE user_name = #{name}")
    UserEntity findByName(@Param("name") String name);

    @Insert("INSERT INTO user VALUES (NULL, #{name}, #{age}, 1, NOW(), NOW())")
    int insert(@Param("name") String name, @Param("age") Integer age);

}

UserService.java

@Service
public class UserService {

    @Autowired
    private UserMapper userMapper;

    public boolean addUser(String userName, Integer age) {
        return userMapper.insert(userName, age) > 0 ? true : false;
    }

    public UserEntity getUserByName(String userName) {
        return userMapper.findByName(userName);
    }

}

UserController.java

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

    @Autowired
    private UserService userService;

    @RequestMapping("/add")
    public String addUser(String userName, Integer age) {
        return userService.addUser(userName, age) ? "success" : "fail";
    }

    @RequestMapping("/get")
    public UserEntity getUserByName(String userName) {
        return userService.getUserByName(userName);
    }
    @RequestMapping("/ok")
    public String getUserByName() {
        return "ok";
    }
}

application.properties

spring.datasource.url=jdbc:mysql://localhost:3306/business?useUnicode=true&characterEncoding=utf8&useSSL=false
spring.datasource.username=root
spring.datasource.password=*****
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

Mybatis14Application.java

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Mybatis14Application {
    public static void main(String[] args) {
        SpringApplication.run(Mybatis14Application.class, args);
    }
}

user.sql

CREATE TABLE `user`  (
  `id` bigint(11) NOT NULL AUTO_INCREMENT COMMENT 'ID，自增主键',
  `user_name` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '用户名称',
  `age` int(11) NOT NULL COMMENT '年龄',
  `status` tinyint(2) NOT NULL DEFAULT 1 COMMENT '状态：-1:删除；0:正常；',
  `create_time` datetime(0) NOT NULL COMMENT '创建时间',
  `update_time` timestamp(0) NOT NULL DEFAULT CURRENT_TIMESTAMP(0) ON UPDATE CURRENT_TIMESTAMP(0) COMMENT '更新时间',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 3 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;

SET FOREIGN_KEY_CHECKS = 1;

四.启动并测试

输入：http://localhost:8080/user/get?userName=zry

返回结果：

参考：https://www.cnblogs.com/lvchengda/p/12619459.html