laravel 4 - >获取列名

Question

如何使用Schema,DB或Eloquent获取Laravel 4中数组或对象中表的列名.

似乎我找不到一个随时可用的功能,也许你有一些自定义的实现.

谢谢.

Answer 1

新答案

当时我给出了这个答案,Laravel没有办法直接这样做,但现在你可以:

$columns = Schema::getColumnListing('users');

老答案

使用属性不起作用,因为如果你这样做

$model = new ModelName;

您没有为该模型设置属性,您将什么也得不到.

然后仍然没有真正的选择,所以我不得不下到数据库级别,这是我的BaseModel:

<?php

class BaseModel extends \Eloquent {

    public function getAllColumnsNames()
    {
        switch (DB::connection()->getConfig('driver')) {
            case 'pgsql':
                $query = "SELECT column_name FROM information_schema.columns WHERE table_name = '".$this->table."'";
                $column_name = 'column_name';
                $reverse = true;
                break;

            case 'mysql':
                $query = 'SHOW COLUMNS FROM '.$this->table;
                $column_name = 'Field';
                $reverse = false;
                break;

            case 'sqlsrv':
                $parts = explode('.', $this->table);
                $num = (count($parts) - 1);
                $table = $parts[$num];
                $query = "SELECT column_name FROM ".DB::connection()->getConfig('database').".INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = N'".$table."'";
                $column_name = 'column_name';
                $reverse = false;
                break;

            default: 
                $error = 'Database driver not supported: '.DB::connection()->getConfig('driver');
                throw new Exception($error);
                break;
        }

        $columns = array();

        foreach(DB::select($query) as $column)
        {
            $columns[] = $column->$column_name;
        }

        if($reverse)
        {
            $columns = array_reverse($columns);
        }

        return $columns;
    }

}

用它来做:

$model = User::find(1);

dd( $model->getAllColumnsNames() );

Answer 2

你可以尝试Schema::getColumnListing('tablename'):

$columns = Schema::getColumnListing('users'); // users table
dd($columns); // dump the result and die

根据您的表格,结果将是这样的:

array (size=12)
  0 => string 'id' (length=2)
  1 => string 'role_id' (length=7)
  2 => string 'first_name' (length=10)
  3 => string 'last_name' (length=9)
  4 => string 'email' (length=5)
  5 => string 'username' (length=8)
  6 => string 'password' (length=8)
  7 => string 'remember_token' (length=14)
  8 => string 'bio' (length=3)
  9 => string 'created_at' (length=10)
  10 => string 'updated_at' (length=10)
  11 => string 'deleted_at' (length=10)

Answer 3

您可以深入了解DB的Doctrine实例.

$columns = DB::connection()
  ->getDoctrineSchemaManager()
  ->listTableColumns('table');

foreach($columns as $column) {
  print $column->getName();
  print $column->getType()->getName();
  print $column->getDefault();
  print $column->getLength();
}

编辑:默认情况下不再安装Doctrine(从L4.1开始)(它是'建议的'而不是'required'包),但可以添加到您的composer.jsonas doctrine/dbal以保留此功能.