[PHP] php mysql_num_rows problem

[Rodrigo Peres]

Hi list,

I have a class to perform my tasks to bd, among than there's this function

function executa($sql="") {
        if($sql == "") {
            $this->resultado = 0;
            $this->numrows = 0;
            $this->row = -1;
        }
        $this->resultado = mysql_query($sql,$this->conexao->id);
        $this->numrows = mysql_num_rows($this->resultado);
}
everything works fine, except when I tri to insert a record. It inserts, but
give an error

"Warning: Supplied argument is not a valid MySQL result resource in
/home/restricted/home/papagaiodigital/public_html/recrutamento/includes/clas
sesql.inc on line 22"

line 22 is "$this->numrows = mysql_num_rows($this->resultado);"

what's the problem??

Thank's n advance

Rodrigo Peres
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