php - Cannot access empty property - Laravel -

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i trying current week following mssql query in laravel 4:

db::connection('db')->select("select datepart(week, '" . $today . "')");

however returns

type: symfony\component\debug\exception\fatalerrorexception message: cannot access empty property file: c:\project\vendor\laravel\framework\src\illuminate\database\connection.php

my guess doesn`t work if there no "from" statement, strange. suggestions on how can workaround appreciated.


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