springboot整合Mybatis（无xml）

1、pom文件 依赖引入

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.8.RELEASE</version>
        <relativePath />
    </parent>

    <dependencies>
        <!-- SpringBoot 测试 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- mybatis 支持 SpringBoot -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>

        <!-- mysql 驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>

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

2、 application.yml 新增配置

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/yys_springboot_mybatis?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
    username: root
    password: 123456
    driver-class-name: com.mysql.cj.jdbc.Driver

3、UserEntity.java

/**
 * 用户管理
 *      Entity
 * @author yys
 */

import com.fasterxml.jackson.annotation.JsonFormat;

import java.io.Serializable;
import java.sql.Date;

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;
    }

}

4、UserController.java

/**
 * 用户管理
 *      Controller
 * @author yys
 */
@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);
    }

}

5、UserService.java

/**
 * 用户管理
 *      Service
 * @author yys
 */
@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);
    }

}

6、UserMapper.java

/**
 * 用户管理
 *      Mapper
 * @author yys
 */
public interface UserMapper {

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

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

}

7、启动类

@SpringBootApplication
@MapperScan("com.yys.mapper")
public class YysApp {

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

}

8、初始化sql文件

CREATE TABLE `yys_user` (
  `id` bigint(11) NOT NULL AUTO_INCREMENT COMMENT 'ID，自增列',
  `user_name` varchar(32) NOT NULL COMMENT '用户名',
  `age` int(11) NOT NULL COMMENT '用户年龄',
  `status` tinyint(2) NOT NULL DEFAULT '' COMMENT '状态：-1-删除；1-正常；',
  `create_time` datetime NOT NULL COMMENT '创建时间',
  `update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

9、测试

http://localhost:8080/user/add?userName=yys&age=18

a、页面结果 - 如下图所示 ：

_b、数据库结果 - 如下图所示 ：_

http://localhost:8080/user/get?userName=yys

a、页面结果 - 如下图所示 ：