Laravel框架Eloquent ORM简介、模型建立及查询数据操(2)

日期：2020-05-15 栏目：程序人生浏览：次

当id大于一的时候，获取一个最大值的age

3.where方式使用

代码如下:

namespace App\Http\Controllers;
use App\Student;
use Illuminate\Support\Facades\DB;
class StudentController extends Controller
{
 public function orm1()
  {
     $student = Student::where('id','>',1)
     ->get();
     dd($student);
 }
}

4.chunk方式使用

代码如下:

namespace App\Http\Controllers;
use App\Student;
use Illuminate\Support\Facades\DB;
class StudentController extends Controller
{
 public function orm1()
  {
     $student = Student::chunck(2,function($student){
  var_dump($student);
 });
 }
}

5.聚合函数的使用

1.count函数

代码如下:

namespace App\Http\Controllers;
use App\Student;
use Illuminate\Support\Facades\DB;
class StudentController extends Controller
{
 public function orm1()
  {
     $student = Student::count();
     dd($student);
 }
}

2.max函数

代码如下:

namespace App\Http\Controllers;
use App\Student;
use Illuminate\Support\Facades\DB;
class StudentController extends Controller
{
 public function orm1()
  {
     $student = Student::max('age');
     dd($student);
 }
}

3.min函数

代码如下:

namespace App\Http\Controllers;
use App\Student;
use Illuminate\Support\Facades\DB;
class StudentController extends Controller
{
 public function orm1()
  {
     $student = Student::min('age');
     dd($student);
 }
}

4.avg函数

代码如下:

namespace App\Http\Controllers;
use App\Student;
use Illuminate\Support\Facades\DB;
class StudentController extends Controller
{
 public function orm1()
  {
     $student = Student::avg('age');
     dd($student);
 }
}

5.sum函数

代码如下:

namespace App\Http\Controllers;
use App\Student;
use Illuminate\Support\Facades\DB;
class StudentController extends Controller
{
 public function orm1()
  {
     $student = Student::sum('age');
     dd($student);
 }
}

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Laravel框架Eloquent ORM简介、模型建立及查询数据操(2)

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