laravel常用查询

$oSpecialty = new Specialty();
//dd(Specialty::where('id', 3)->value('path'));//查询单个字段，返回的是string
//dd(Specialty::where('id',3)->first(['id','pid','path']));//查询多个定义的字段
//dd(Specialty::where('pid',0)->get(['id','pid','path']));//查询多个字段组成的数据集
//dd(Specialty::where('pid',0)->lists('id'));//查询某个列的集合，返回结果key是0,1,2值为id的集合
dd(Specialty::where('pid',0)->skip(5)->take(10)->get());//查询限制条数的记录
//dd(DB::update('update users set name="neo2" where id=1200'));//原生态更新

//$userModel = new User();
$info1=User::where('id', 1)->get();
$info2=User::find(1);
$info3=User::whereid(1)->first();
$info4=User::where('id', 1)->first();
$info5 = User::where(['id'=>1,'email'=>'admin@163.com'])->first();//多个条件
$info6 = User::whereid(1)->first();//采用where+键名查询
$info7 = User::where(['id'=>1])->first();
$info8 = User::where(['id'=>1])->first()->toArray();//注意toArray对象为null会报错，因此一般不这样用
$info9 = UserBind::where(['fromId'=>1])->get()->toArray();//注意toArray对象为null会报错，因此一般不这样用

User::whereIn('id', $id)->delete();//需要注意$id为数组，不是用逗号链接的字符串
Teacher::whereIn('user_id',$id)->delete();;//删除老师表