SpringBoot 整合MyBatis-Plus

前言

MyBatis-Plus（简称 MP）是一个 MyBatis 的增强工具，在 MyBatis 的基础上只做增强不做改变，为简化开发、提高效率而生。可参考https://mp.baomidou.com/guide/

一、建库建表

• 建库

CREATE DATABASE test;

• 建表
  建表并插入数据。

DROP TABLE IF EXISTS user;
CREATE TABLE user
(
    id BIGINT(20) NOT NULL COMMENT '主键ID',
    name VARCHAR(30) NULL DEFAULT NULL COMMENT '姓名',
    age INT(11) NULL DEFAULT NULL COMMENT '年龄',
    email VARCHAR(50) NULL DEFAULT NULL COMMENT '邮箱',
    PRIMARY KEY (id)
);

DELETE FROM user;
INSERT INTO user (id, name, age, email) VALUES
(1, 'Jone', 18, 'test1@baomidou.com'),
(2, 'Jack', 20, 'test2@baomidou.com'),
(3, 'Tom', 28, 'test3@baomidou.com'),
(4, 'Sandy', 21, 'test4@baomidou.com'),
(5, 'Billie', 24, 'test5@baomidou.com');

二、pom.xml文件

添加lombok依赖和mybatis-plus依赖。

    <properties>
        <java.version>1.8</java.version>
        <mybatis.plus.version>3.2.0</mybatis.plus.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!--mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>${mybatis.plus.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
    </dependencies>

三、配置文件

使用yml配置

spring:
  #DataSource Config
  datasource:
    url: jdbc:mysql://localhost:3306/test?serverTimezone=GMT
    username: root
    password: 123456
    driver-class-name: com.mysql.jdbc.Driver
    schema: classpath:db/schema-mysql.sql
    data: classpath:db/data-mysql.sql

四、实体类

@Data
public class User {
    private Long id;
    private String name;
    private Integer age;
    private String email;
}

五、mapper类

public interface UserMapper extends BaseMapper<User> {

}

六、controller类

@RestController
public class UserController {

    @Autowired
    private UserMapper userMapper;

    @GetMapping("/users")
    public List<User> list() {
        return userMapper.selectList(null);
    }
}

七、启动类

在 Spring Boot 启动类中添加 @MapperScan 注解，扫描 Mapper 文件夹：

@SpringBootApplication
@MapperScan("com.huzh.springbootmybatisplus.mapper")
public class SpringbootMybatisPlusApplication {

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

}