eloquent 使用 – Robin's 绝对领域

简介eloquent 为laravel中的orm模块

以下代码为orm对象生成命令

php artisan make:model Flight //创建Flight orm 对象

php artisan make:model Flight --migration | -m //生成migration数据库迁移文件

# Generate a model and a FlightFactory class...
php artisan make:model Flight --factory
php artisan make:model Flight -f

# Generate a model and a FlightSeeder class...
php artisan make:model Flight --seed
php artisan make:model Flight -s

# Generate a model and a FlightController class...
php artisan make:model Flight --controller
php artisan make:model Flight -c

# Generate a model and a migration, factory, seeder, and controller...
php artisan make:model Flight -mfsc

生成的基本对象：

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Flight extends Model
{
    //optional
    protected $table = 'my_flights';//指定表名
    protected $primaryKey = 'flight_id'; //指定主键
    public $incrementing = false; //主键生成模式
    protected $keyType = 'string';
 //主键数据类型
    public $timestamps = false;
//是否有create 和 update 时间
    protected $dateFormat = 'U';
 //日期格式
    const CREATED_AT = 'creation_date';
 //创建时间字段名
    const UPDATED_AT = 'updated_date';//更新时间字段名
    protected $connection = 'sqlite';
 //指定该orm数据库连接
    protected $fillable = [] //数组 可批量创建的字段
    protected $guard = [] //数组 不可批量创建的字段

    protected $attributes = [
   //字段默认值
        'delayed' => false,
    ];


}

查询方法：

Flight::all

use App\Models\Flight;

foreach (Flight::all() as $flight) {
    echo $flight->name;
}

查询构造器

$flights = Flight::where('active', 1)
               ->orderBy('name')
               ->take(10)
               ->get();

聚合函数

$count = Flight::where('active', 1)->count();

$max = Flight::where('active', 1)->max('price');

对象collection reject方法剔除取消的航班（闭包返回true）

$flights = Flight::where('destination', 'Paris')->get();

$flights = $flights->reject(function ($flight) {
    return $flight->cancelled;
});

orm游标

use App\Models\User;

$users = User::cursor()->filter(function ($user) {
    return $user->id > 500;
});

子查询

use App\Models\Destination;
use App\Models\Flight;

return Destination::addSelect(['last_flight' => Flight::select('name')
    ->whereColumn('destination_id', 'destinations.id')
    ->orderByDesc('arrived_at')
    ->limit(1)
])->get();

查一条数据

use App\Models\Flight;

// Retrieve a model by its primary key...
$flight = Flight::find(1);

// Retrieve the first model matching the query constraints...
$flight = Flight::where('active', 1)->first();

// Alternative to retrieving the first model matching the query constraints...
$flight = Flight::firstWhere('active', 1);

查到一条或者（闭包）

model = Flight::where('legs', '>', 3)->firstOr(function () {
    // ...
});

查询报notFound fail方法

$flight = Flight::findOrFail(1);

$flight = Flight::where('legs', '>', 3)->firstOrFail();

静态创建

use App\Models\Flight;

// Retrieve flight by name or create it if it doesn't exist...
$flight = Flight::firstOrCreate([
    'name' => 'London to Paris'
]);

// Retrieve flight by name or create it with the name, delayed, and arrival_time attributes...
$flight = Flight::firstOrCreate(
    ['name' => 'London to Paris'],
    ['delayed' => 1, 'arrival_time' => '11:30']
);

// Retrieve flight by name or instantiate a new Flight instance...
$flight = Flight::firstOrNew([
    'name' => 'London to Paris'
]);

// Retrieve flight by name or instantiate with the name, delayed, and arrival_time attributes...
$flight = Flight::firstOrNew(
    ['name' => 'Tokyo to Sydney'],
    ['delayed' => 1, 'arrival_time' => '11:30']
);

对象创建

<?php

namespace App\Http\Controllers;

use App\Http\Controllers\Controller;
use App\Models\Flight;
use Illuminate\Http\Request;

class FlightController extends Controller
{
    /**
     * Store a new flight in the database.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {
        // Validate the request...

        $flight = new Flight;

        $flight->name = $request->name;

        $flight->save();
    }
}

对象更新

use App\Models\Flight;

$flight = Flight::find(1);

$flight->name = 'Paris to London';

$flight->save();

批量更新

Flight::where('active', 1)
      ->where('destination', 'San Diego')
      ->update(['delayed' => 1]);

对象填充数据

$flight->fill(['name' => 'Amsterdam to Frankfurt']);

按条件更新或创建

$flight = Flight::updateOrCreate(
    ['departure' => 'Oakland', 'destination' => 'San Diego'],//条件
    ['price' => 99, 'discounted' => 1] //数据
);

Flight::upsert([
    ['departure' => 'Oakland', 'destination' => 'San Diego', 'price' => 99],
    ['departure' => 'Chicago', 'destination' => 'New York', 'price' => 150]
], ['departure', 'destination'], ['price']);

删除

use App\Models\Flight;

$flight = Flight::find(1);

$flight->delete();

Flight::destroy(1);

Flight::destroy(1, 2, 3);

Flight::destroy([1, 2, 3]);

Flight::destroy(collect([1, 2, 3]));

查询删除

$deletedRows = Flight::where('active', 0)->delete();

逻辑删除

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;

class Flight extends Model
{
    use SoftDeletes; //多一个deleted_at字段
}

迁移文件

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Facades\Schema;

Schema::table('flights', function (Blueprint $table) {
    $table->softDeletes();
});

Schema::table('flights', function (Blueprint $table) {
    $table->dropSoftDeletes();
});

检查是是否被软删除

if ($flight->trashed()) {
    //
}

还原逻辑删除的数据

$flight->restore();
Flight::withTrashed()
        ->where('airline_id', 1)
        ->restore();
$flight->history()->restore();

强制物理删除

$flight->forceDelete();

和软删除的数据一起查询

$flights = Flight::withTrashed()
                ->where('account_id', 1)
                ->get();

只查询软删除的数据

$flights = Flight::onlyTrashed()
                ->where('airline_id', 1)
                ->get();

对象复制replicate

use App\Models\Address;

$shipping = Address::create([
    'type' => 'shipping',
    'line_1' => '123 Example Street',
    'city' => 'Victorville',
    'state' => 'CA',
    'postcode' => '90001',
]);

$billing = $shipping->replicate()->fill([
    'type' => 'billing'
]);

$billing->save();

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