Laravel 數據庫操做之Eloquent ORM模型

//模型中的相關代碼

namespace App;

use Illuminate\Database\Eloquent\Model;

class Student extends Model{
    //默認對應的是模型複數，即students,若是不是，須要本身指定表名
    protected $table = 'student';//指定表名

    //默認主鍵是id，若是不是，須要指定
    protected $primaryKey = 'id';

    //自動維護時間戳
    public $timestamps = true;

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

    //不格式化時間戳
    protected function asDateTime($val)
    {
        return $val;
    }

    //指定容許批量賦值的字段
    protected $fillable = ['name','age'];

    //指定不容許批量賦值的字段
    protected $guarded = ['name','age'];

}

//控制器的相關代碼
//orm 使用模型查詢
public function orm1(){

    //all().返回模型的對象
    $student = Student::all();

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

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

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

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

//orm 使用模型查詢
public function orm2(){
    //使用模型新增數據
    $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方法新增數據,
    $student = Student::create(['name'=>'haha','age'=>10]);

    //firstOrCreate,先查找，若沒有則新增
    $student = Student::firstOrCreate(['name'=>'haha']);

    //firstOrNew,先查找，若沒有則返回實例，須要自行調用save新增
    $student = Student::firstOrNew(['name'=>'haha']);
    $bool = $student->save();

    //經過模型更新數據
    $student = Student::find(10);
    $student->name = 'happy';
    $bool = $student->save();
    var_dump($bool);

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

    //經過模型刪除,不存在會報錯
    $student = Student::find(10);
    $bool = $student->delete();
    var_dump($bool);

    //經過主鍵刪除
    $num=Student::destroy(10);
    var_dump($num);
    $num=Student::destroy([10,11,20]);
    var_dump($num);

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

}