Mybatis-plus 搭建环境

Mybatis-plus

1. 导入Maven 依赖

<dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.3.1</version>
</dependency>

2. Spring Boot 配置文件配置数据源

server:
  port: 8080
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    type: com.zaxxer.hikari.HikariDataSource
    username: root
    password: 1234
    url: jdbc:mysql://localhost:3306/love?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&useSSL=false

3. 创建POJO 实体类

@Data
public class girl {
    private int id;
    private String name;
    private String address;
}

4. 创建接口 操作数据库

@Mapper
public interface usermapper extends BaseMapper<girl> {

}

5. 使用测试

@RestController
public class login {

    @Autowired
    private usermapper usermapper;

    @RequestMapping("/index")
    public String test(){
        if(usermapper == null){
            return "为空";
        }
        List<girl> girls = usermapper.selectList(null);
        for (girl g:girls) {
            System.out.println(g);
        }
        return "hello world";
    }
}

5. Spring Boot 主程序 加入 包扫描

@SpringBootApplication
@MapperScan("app.mapper")
public class Boot {
    public static void main(String[] args) {
        SpringApplication.run(Boot.class);
    }
}