ThinkPHP framework questions about whether a database value exists

The ThinkPHP framework wants to log on to the system to check whether the database has a certain value. but if I submit the previously registered data, the output is always "where ()". how can I change it? My database account is & nbsp; account_number ThinkPHP framework. Is there a value in the database?



I just want to create a login system, but submitting the previously registered output is always





Is there a problem with where ()? how can I change it?

My database account is account_number
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------ Solution --------------------
Where ('account _ number = $ username ')
Writing at least
Where ("account_number = $ username ")
Considering that $ username may not be a pure number
Therefore, writing
Where ("account_number = '$ username '")
Or
Where (array ('account _ number' => $ username ))