It will output collection with both first_name and username, rather than only username. Better use pluck(), solo or optionally in combination with select - if you want specific columns. TableName::select('username')->where('id', 1)->pluck('username'); or TableName::where('id', 1...
{ /** * Demonstrate the usage of get method * * @return response() */ public function index() { // Use the 'get' method to select specific columns $users = User::select('name', 'email')->get(); // The 'get' method returns a collection of users, but only the 'name' and ...
1. I query the DB in the callback and get all the data I need. 2. I then go over the collection and create a new array on each iteration and assign a value & header. Works great for picking out columns from a model Excel::create('User List Export', function($excel) {$excel->...
Laravel是一种流行的PHP开发框架,它提供了丰富的功能和工具,使开发人员能够快速构建高质量的Web应用程序。在Laravel中,我们可以使用Eloquent ORM(对象关系映射)来与数据库进行交互。 当我们需要从关系中获取一列数据时,可以使用Eloquent提供的pluck方法。pluck方法允许我们从数据库中的指定列中获取数据,并返回一个包含这些...
*将Select查询编译成SQL语句 * @param \Illuminate\Database\Query\Builder $query * @return string */ public function compileSelect(Builder $query) { $original = $query->columns; //如果没有QueryBuilder里没制定查询字段,那么默认将*设置到查询字段的位置 ...
public static function all($columns = ['*']) { return (new static)->newQuery()->get( is_array($columns) ? $columns : func_get_args() ); } 这个查询过程,可以分成三个步骤来执行: new static: 模型实例化,得到模型对象。 $model->newQuery(): 根据模型对象,获取查询构造器$query。
// The used SELECT statements have a different number of columns return $this->visits()->select('timelines.id') ->union($this->visitsChildren()->select('timelines.id')); } 这适用于特定的地方: Place::find($placeId)->visits->count(); // 118 ...
phpreturnarray('title'=>'分数信息',//栏目名'single'=>' >>',//新建描写叙述'model'=>'ScoreInfo',//分数信息'form_width'=>960,//左边栏目宽//列表'columns'=>array('so_id'=>array('title'=>'编号','select'=>"so_id",'sort_field'=>'so_id'),'s_name'=>array('title'=>'学生姓名...
*/publicfunctionget($columns= ['*']){if(is_null($this->columns)) {$this->columns =$columns; }return$this->processor->processSelect($this,$this->runSelect()); } 所以使用Laravel的ORM方法查询返回指定的字段可通过如下三种方法来实现
find方法的实现是在\Illuminate\Database\Eloquent\Builder类里,如下:/** * Find a model by its primary key. * * @param mixed $id * @param array $columns * @return \Illuminate\Database\Eloquent\Model|\Illuminate\Database\Eloquent\Collection|null */publicfunctionfind($id,$columns=['*']){if...