Laravel 数据库操作之Eloquent ORM模型

//模型中的相关代码

namespace App;

use Illuminate\Database\Eloquent\Model;

class Student extends Model{    //默认对应的是模型复数，即students,如果不是，需要自己指定表名    protected $table = ‘student‘;//指定表名

//默认主键是id，如果不是，需要指定    protected $primaryKey = ‘id‘;

//自动维护时间戳    public $timestamps = true;

protected function getDateFormat()    {        return time();    }

//不格式化时间戳    protected function asDateTime($val)    {        return $val;    }

//指定允许批量赋值的字段    protected $fillable = [‘name‘,‘age‘];

//指定不允许批量赋值的字段    protected $guarded = [‘name‘,‘age‘];

}

//控制器的相关代码//orm 使用模型查询public function orm1(){

//all().返回模型的对象    $student = Student::all();

//find()    $student = Student::find(100);

//findOrFail(),查找不到就报错    $student = Student::findOrFail(100);

//get()    $student = Student::get();

//first()    $student = Student::where(‘id‘,‘>‘,10)        ->orderBy(‘age‘,‘desc‘)        ->first();}

//orm 使用模型查询public function orm2(){    //使用模型新增数据    $student = new Student();    $student->name = ‘hello‘;    $student->age = ‘hello‘;    $bool = $student->save();    var_dump($bool);

//格式化日期    $student = Student::find(1);    echo date(‘Y-m-d H:i:s‘,$student->addtime);

//使用模型的create方法新增数据,    $student = Student::create([‘name‘=>‘haha‘,‘age‘=>10]);

//firstOrCreate,先查找，若没有则新增    $student = Student::firstOrCreate([‘name‘=>‘haha‘]);

//firstOrNew,先查找，若没有则返回实例，需要自行调用save新增    $student = Student::firstOrNew([‘name‘=>‘haha‘]);    $bool = $student->save();

//通过模型更新数据    $student = Student::find(10);    $student->name = ‘happy‘;    $bool = $student->save();    var_dump($bool);

//批量更新,返回行数    $num = Student::where(‘id‘,‘>‘,10)->update(        [‘age‘=>20]    );    var_dump($num);

//通过模型删除,不存在会报错    $student = Student::find(10);    $bool = $student->delete();    var_dump($bool);

//通过主键删除    $num=Student::destroy(10);    var_dump($num);    $num=Student::destroy([10,11,20]);    var_dump($num);

$num=Student::where(‘id‘,‘>‘,20)->delete();    var_dump($num);

}

原文地址：https://www.cnblogs.com/gyfluck/p/9040061.html