Laravel 中Eloquent ORM 相关操作

use AppUser;
$users = User::all();

$users = User::where('active', 1)
 ->orderBy('name', 'desc')
 ->take(10)
 ->get();

$result = User::where('gender', '1')->pluck('name');
 // 返回 ['name1','name2 ']
// 该自定义键必须是该表的其它字段列名，否则会报错
$result = User::where('gender', '1')->pluck('email','name');
// 返回 {"name1":"ed9@qq.com","name2":"ed89@qq.com"}

// 通过主键获取模型
$user = User::find(1);
// 获取匹配查询条件的第一个模型...
$user = User::where('active', 1)->first();
// 返回第一个gender为1的用户的名字
$name = User::where('gender', '1')->value('name');
// 传递主键数组来调用 find 方法，这将会返回匹配记录集合：
$users = AppFlight::find([1, 2, 3]);
如果没有任何查询结果，IlluminateDatabaseEloquentModelNotFoundException 异常将会被抛出：
$model = AppFlight::findOrFail(1);
$model = AppFlight::where('legs', '>', 100)->firstOrFail();

$result = User::where('gender', '1')->chunk(5, function($users) {
 foreach ($users as $user) {
 $name = $user->name;
 echo $name;
 }
}) // 输出名字
// result 为 boolean 
$result = User::where('gender', '1')->chunk(5, function($users) {
 foreach ($users as $user) {
 $name = $user->name;
 if ($name == "dxx5") {
 echo $name;
 return false;
 }
 }
}) // 找出某个名字

// 获取总数
$count = Flight::where('active', 1)->count();
// 获取最大值
$max = Flight::where('active', 1)->max('price');
//平均值
$max = Flight::where('active', 1)->avg('price');

 // 查询名字和email
 $users = User::select('name','email as user_email')->get();
 // 返回 [{"name":"name1","user_email":"1@qq.com"}]
 // 查询构建器实例,添加一个查询列到已存在的 select 子句
 $user = User::select('name');
 $users = $user->addSelect('gender')->get();

$first = DB::table('users')
 ->whereNull('first_name');
$users = DB::table('users')
 ->whereNull('last_name')
 ->union($first)
 ->get();

$users = User::where('gender', '=', 1)->get(); // 男性用户
$users = User::where('gender', 1)->get(); // 同上
$users = User::where('age', '>=', 10)->get(); // 10岁以上用户
$users = User::where('age', '<>', 10)->get(); // 非10岁用户
$users = User::where('name', 'like', 'd%')->get(); // 名字为d开头的用户
$users = User::where('name', 'like', '%d%')->get(); // 名字含d的用户
// 传递条件数组到 where 函数：
$users = User::where([['gender', '=', '1'],['age', '>', '10']])->get(); //10岁以上的男孩
// or语句
$users = User::where('gender', '=', 1)->orWhere('age', '>', '10')->get();

// whereBetween 方法验证列值是否在给定值之间：
$users = User::whereBetween('age', [1, 7])->get(); // 1-7岁的用户
// whereNotBetween 方法验证列值不在给定值之间：
$users = User::whereNotBetween('age', [1, 7])->get(); // 1-7岁以外的用户
// whereIn 方法验证给定列的值是否在给定数组中：
$users = User::whereIn('id', [1, 2, 3])->get();
// whereNotIn 方法验证给定列的值不在给定数组中：
$users = User::whereNotIn('id', [1, 2, 3])->get();
// whereNull 方法验证给定列的值为NULL：
$users = User::whereNull('updated_at')->get();
// whereNotNull 方法验证给定列的值不是 NULL：
$users = User::whereNotNull('updated_at')->get();
// whereDate 方法用于比较字段值和日期：
$users = User::whereDate('created_at', '2018-05-10')->get(); // 20180510注册的用户
// whereMonth 方法用于比较字段值和一年中的指定月份：
$users = User::whereMonth('created_at', '10')->get();
// whereDay 方法用于比较字段值和一月中的制定天：
$users = User::whereDay('created_at', '10')->get();
whereYear 方法用于比较字段值和指定年：
$users = User::whereYear('created_at', '2016')->get();
// whereColumn 方法用于验证两个字段是否相等，也可以传递一个比较运算符到该方法：
$users = User::whereColumn('first_name', 'last_name')->get();
$users = User::whereColumn('updated_at', '>', 'created_at')->get();
 
// 还可以传递多条件数组到 whereColumn 方法，这些条件通过 and 操作符进行连接：
$users = User::whereColumn([
 ['first_name', '=', 'last_name'],
 ['updated_at', '>', 'created_at']
 ])->get();

$users = User::where('name', '=', 'xxx')
 ->orWhere(function ($query) {
 $query->where('age', '>', 5)
 ->where('gender', 1);
 })
 ->get(); // xxx或大于5岁的男孩
where exit
$users = User::whereExists(function ($query) {
 $query->select(DB::raw(1))
 ->from('articles')
 ->whereRaw('articles.user_id = users.id');
})->get(); // 写过文章的用户

$users = User::orderBy('age', 'desc')->get(); // 年龄倒序
$user = User::latest()->first(); //crate_at 最晚的那个
$user = User::oldest()->first(); //crate_at 最早的那个
$users = User::inRandomOrder()->first(); // 随机用户

$users = User::skip(2)->take(3)->get(); // 跳过前2个取中间3个
$users = User::offset(2)->limit(3)->get(); // 同上

$users = User::groupBy('name')->having('age', '>', 10)->get(); // 大于10的用户
// 找到所有售价大于 $2,500 的部分， 没理解
$users = User::select('department', DB::raw('SUM(price) as total_sales'))
 ->groupBy('department')
 ->havingRaw('SUM(price) > 2500')
 ->get();
when 条件子句
$sortBy = null; // 当sortBy为null，默认name排序
$users = User::when($sortBy, 
 function ($query) use ($sortBy) {
 return $query->orderBy($sortBy);
 }, function ($query) {
 return $query->orderBy('name');
 })
 ->get();

$users = User::paginate(3);
$users->appends(['sort' => 'name'])->links(); // 修改的是连接
$users->withPath('custom/url');
// 约束条件
$users = User::where('id', '>', 2)->paginate(2);
$users = User::where('id', '>', 2)->simplePaginate(2);
return $users->toArray();

{
 "current_page" : 1
 "data": [{"id":1,"name":"name1"},{"id":2,"name":"name2"}]
 "from":1
 "last_page":2
 "next_page_url":"http://localhost:8888/user/page?page=2"
 "path":"http://localhost:8888/user/page"
 "per_page":3
 "prev_page_url":null
 "to":3
 "total":6
}

$results->count()
$results->currentPage()
$results->firstItem()
$results->hasMorePages()
$results->lastItem()
$results->lastPage() (使用simplePaginate 时无效)
$results->nextPageUrl()
$results->perPage()
$results->previousPageUrl()
$results->total() (使用simplePaginate 时无效)
$results->url($page)

$user = new User;
$user->name = "username";
$user->fill(['grade' => '2']); // 使用 fill 方法通过数组属性来填充
$user->save();
$row = array('name' => str_random(3),'email' => str_random(3).'@qq.com')
$user = User::create($row); // 返回模型对象
$id = User::insertGetId($row); // 插入记录并返回ID值
$success = User::nsert([
 ['email' => 'taylor@example.com', 'votes' => 0],
 ['email' => 'dayle@example.com', 'votes' => 0]
]); // 插入多条

$user = User::find(1);
$user->name = 'new name';
$user->save();

User::where('gender', 1)->update(['age' => 1]);

$result = User::increment('age'); // 返回修改的行数
$result = User::increment('age', 2);
$result = User::decrement('age');
$result = User::decrement('age', 2);
$result = User::increment('age',1,['gender' => 1]); // 年龄自增1 且 性别改为1

$user = User::firstOrCreate(['name' => 'Flight 10']); // 不存在则创建
$user = User::firstOrNew(['name' => 'Flight 10']); // 如果不存在初始化一个新的实$user = User::updateOrCreate(
 ['name' => 'username', 'age' => '16'],
 ['grade' => 3]
); // 将 16岁的username 改成3年级，没有则创建

$user = User::find(1);
$user->delete(); // 通过主键查询后，删除模型
User::destroy(1); // 直接通过主键删除
User::destroy([1, 2, 3]);
User::destroy(1, 2, 3);
$deletedRows = User::where('age', 0)->delete(); //查询 删除
// 注：通过 Eloquent 批量删除时，deleting 和 deleted 事件不会被触发，因为在进行模型删除时不会获取模型。

<?php
namespace App;
use IlluminateDatabaseEloquentModel;
use IlluminateDatabaseEloquentSoftDeletes;
class Flight extends Model
{
 use SoftDeletes;
 // 应该被调整为日期的属性，并添加 deleted_at 列到数据表
 protected $dates = ['deleted_at'];
}
// Laravel Schema 构建器包含一个辅助函数来创建该数据列：
Schema::table('flights', function ($table) {
 $table->softDeletes();
});

if ($flight->trashed()) {
 //
}
// 如果你想要软删除模型出现在查询结果中，可以使用 withTrashed 方法：
$flights = AppFlight::withTrashed()
 ->where('account_id', 1)
 ->get();
 
// withTrashed 方法也可以用于关联查询中：
$flight->history()->withTrashed()->get();
// onlyTrashed 方法只获取软删除模型：
$flights = AppFlight::onlyTrashed()
 ->where('airline_id', 1)
 ->get();
 
// 恢复软删除模型，使用restore 方法：
$flight->restore();
// 快速恢复多个模型，同样，这也不会触发任何模型事件：
AppFlight::withTrashed()
 ->where('airline_id', 1)
 ->restore();
 
// 也可以用于关联查询：
$flight->history()->restore();
// 永久删除模型，可以使用 forceDelete 方法：
$flight->forceDelete(); // 强制删除单个模型实例...
$flight->history()->forceDelete(); // 强制删除所有关联模型...