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/

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');

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>

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

实体类

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

mapper类

public interface UserMapper extends BaseMapper<User> {

}

controller类

@RestController
public class UserController {

    @Autowired
    private UserMapper userMapper;

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

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);
    }

}