ThinkPHP5——模型的一对多关联

hasMany(‘关联模型名‘,‘外键名‘,‘主键名‘,[‘模型别名定义‘]);

#宿舍
CREATE TABLE `apartment` (
  `apar_id` int(11) NOT NULL AUTO_INCREMENT COMMENT ‘编号‘,
  `apar_name` varchar(40) DEFAULT NULL COMMENT ‘名称‘,
  `apar_type` varchar(20) DEFAULT NULL COMMENT ‘类型‘,
  `apar_price` varchar(30) DEFAULT NULL COMMENT ‘价格‘,
  `apar_sum` int(11) DEFAULT NULL COMMENT ‘床数‘,
  PRIMARY KEY (`apar_id`)
) COMMENT=‘宿舍‘;


#租客
CREATE TABLE `client` (
  `cli_id` int(11) NOT NULL AUTO_INCREMENT COMMENT ‘编号‘,
  `aid` int(11) DEFAULT NULL COMMENT ‘外键‘,            #房间
  `cli_name` varchar(20) DEFAULT NULL COMMENT ‘姓名‘,
  `cli_sex` varchar(20) DEFAULT NULL COMMENT ‘性别‘,
  `cli_phone` varchar(40) DEFAULT NULL COMMENT ‘电话‘,
  `cli_identity` varchar(50) DEFAULT NULL COMMENT ‘身份证‘,
  `cli_reservation` varchar(40) DEFAULT NULL COMMENT ‘预定房间‘,
  PRIMARY KEY (`cli_id`),
  KEY `Apar_id` (`aid`),
  CONSTRAINT `client_ibfk_1` FOREIGN KEY (`aid`) REFERENCES `apartment` (`apar_id`)
) COMMENT=‘租客‘;

<?php
namespace app\demo\model;
use think\Model;
//宿舍
class Apartment extends Model
{
    //定义关联方法
    public function comm(){
        //hasMany(‘租客表名‘,‘租客表外键‘,‘宿舍主键‘,[‘模型别名定义‘]);
        return $this->hasMany(‘client‘,‘aid‘,‘apar_id‘);
    }
}

　　　　//方法一：这个需要调用$apr->comm才查顾客表
        $apr = Apartment::get(1);
        $apr->comm;//注意这里不加括号
        //方法二：不用调用$apr->comm，预先查租客表
        $apr = Apartment::get(1,‘comm‘);

　　　　//根据关联条件查询
        $apr = Apartment::get(1);
        $data = $apr->comm()->where(‘cli_name‘,‘陈芬‘)->select();
        print_r($data);
        //或者使用getBy
        $apr = Apartment::get(1);
        $data = $apr->comm()->getByCliName(‘陈芬‘);
        print_r($data);

    　　//聚合查询，默认查询宿舍的租客人数‘>=‘1的宿舍
        $apr = Apartment::has(‘comm‘)->select();
        //查询宿舍的租客人数‘>=‘3的宿舍
        $apr = Apartment::has(‘comm‘,‘>=‘,‘3‘)->where(‘apar_name‘,‘410‘)->select();
        print_r($apr);    

    　　//新增，添加一位租客
        $apr = Apartment::get(1);
        $cli = new Client();
        $cli->cli_name = "小唐";
        $cli->cli_sex = ‘男‘;
        $cli->cli_phone=‘1315***‘;
        $cli->cli_identity=‘4487654334567610‘;
        $cli->cli_reservation=‘没有‘;
        $apr->comm()->save($cli);

//批量新增租客
$apr = Apartment::get(2);
$cli = [
   ["cli_name"=>‘阿K‘,‘cli_sex‘=>‘男‘,‘cli_phone‘=>‘1315***‘,‘cli_identity‘=>‘448***‘,‘cli_reservation‘=>‘没有‘],
   ["cli_name"=>‘小胡‘,‘cli_sex‘=>‘男‘,‘cli_phone‘=>‘1315***‘,‘cli_identity‘=>‘448***‘,‘cli_reservation‘=>‘没有‘]
];
$apr->comm()->saveAll($cli);

        //更新
        $apr = Apartment::get(1);
        $comm = $apr->comm()->getByCliName(‘陈杨文‘);
        $comm->cli_name=‘杨文‘;
        $comm->save();
        //或者通过update方法更新
        $apr = Apartment::get(1);
        $apr->comm()->where(‘cli_id‘,5)->update([‘cli_name‘=>‘陈杨文‘]);    

        //删除id为13的租客
        $apr = Apartment::get(2);
        $comm = $apr->comm()->getByCliId(13);
        $comm->delete();
        //删除所有的关联数据
        $apr = Apartment::get(2);
        $apr->$comm()->delete();