php - mysql automatically cast strings to integer -

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i've noticed if mysql request one:

select 1 mytable id = 'asdf'

then string 'asdf' casted 0. means have record id 0 match. format of id field int(8).

what best way proceed:

  • i need check (by php example) value numerical only?
  • there mysql way that?
  • i must remove record id 0? (bad)

you must first sanitize inputs via php.

$id = 'asdf'; if(is_numeric($id)){     $query("select 1 mytable id = $id"); }else{     die("id not numeric"); }

or can do:

    select 1 mytable id = 'asdf' , 'asdf' regexp '^-?[0-9]+$'

this cause regex = false, causing no rows return.


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