本文實(shí)例講述了Laravel框架Eloquent ORM簡(jiǎn)介、模型建立及查詢數(shù)據(jù)操作。分享給大家供大家參考，具體如下：
注：以下知識(shí)點(diǎn)可能有不全面之處，望見諒
NO.1Eloquent ORM簡(jiǎn)介
Laravel所自帶的Eloquent ORM是一個(gè)優(yōu)美、簡(jiǎn)潔的ActiveRecord實(shí)現(xiàn)，用來(lái)實(shí)現(xiàn)數(shù)據(jù)庫(kù)操作
每個(gè)數(shù)據(jù)表都有與之相對(duì)應(yīng)的“模型（Model）”用于和數(shù)據(jù)交互
NO.2模型的建立
最基礎(chǔ)的模型代碼如下:
namespace App;
use Illuminate\Database\Eloquent\Model;
class Student extends Model
{
//指定表名
protected $table = 'student';
//指定id
protected $primaryKey = 'id';
}
將他創(chuàng)建于app目錄下，命名為Student.php
NO.3查詢數(shù)據(jù)
首先在查詢之前，我先讓你們看一下我的數(shù)據(jù)庫(kù)
數(shù)據(jù)如上，然后查詢
1.all方式
代碼如下:
namespace App\Http\Controllers;
use App\Student;
use Illuminate\Support\Facades\DB;
class StudentController extends Controller
{
public function orm1()
{
$students = Student::all();
dd($students);
}
}
顯示數(shù)據(jù)庫(kù)里的所有數(shù)據(jù)
2.find方式
代碼如下:
namespace App\Http\Controllers;
use App\Student;
use Illuminate\Support\Facades\DB;
class StudentController extends Controller
{
public function orm1()
{
$students = Student::find(1);
dd($students);
}
}
查找指定數(shù)據(jù)
3.findOrFail方式
代碼如下:
namespace App\Http\Controllers;
use App\Student;
use Illuminate\Support\Facades\DB;
class StudentController extends Controller
{
public function orm1()
{
$students = Student::findOrFail(1);
dd($students);
}
}
如果他沒查到指定的數(shù)據(jù)，那么他會(huì)報(bào)錯(cuò)，而find若是沒有查到該函數(shù)，只會(huì)彈出一個(gè)null
4.查詢構(gòu)造器的使用
namespace App\Http\Controllers;
use App\Student;
use Illuminate\Support\Facades\DB;
class StudentController extends Controller
{
public function orm1()
{
$students = Student::get();
dd($students);
}
}
他會(huì)得到一個(gè)完整的數(shù)據(jù)信息，和原本的意義沒有區(qū)別
代碼如下:
namespace App\Http\Controllers;
use App\Student;
use Illuminate\Support\Facades\DB;
class StudentController extends Controller
{
public function orm1()
{
$student = Student::where('id','>',1)
->orderBy('age','desc')
->first();
dd($student);
}
}
當(dāng)id大于一的時(shí)候，獲取一個(gè)最大值的age
代碼如下:
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);
}
}
代碼如下:
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.聚合函數(shù)的使用
代碼如下:
namespace App\Http\Controllers;
use App\Student;
use Illuminate\Support\Facades\DB;
class StudentController extends Controller
{
public function orm1()
{
$student = Student::count();
dd($student);
}
}
代碼如下:
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);
}
}
代碼如下:
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);
}
}
代碼如下:
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);
}
}
代碼如下:
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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希望本文所述對(duì)大家基于Laravel框架的PHP程序設(shè)計(jì)有所幫助。
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