pg_result

hi list.

this is my script:

$query7="select provinceid from province where province like '$tablename1';";
$result7=pg_exec($conn,$query7);
if(!$result7){
    .
    .
    .}
else    {
    .
    .
    .
    }

my problem is when the value of the variable $tablename1 is not on the table
province, it doesn't go to the if statements. what am i doing wrong?

thanks!