php - Error in MySQL Syntax using select statement -


hi can please me in this, don't know error is. here code:

    $capacitance =@mysql_query ("select distinct wwpn,  substr(val, 1, length(val) / 2) capacitor,                              substr(val, length(val) / 2+1) capasitance                                bom_csv boardnumber ='$board' , qty<>'' , qty !='qty'");     @mysql_query($capacitance,$connect)or die("failed execute query:<br />" . mysql_error(). "<br />" . mysql_errno());     while($row = mysql_fetch_array($capacitance))      {          $capacitor = $row['capacitor'];          $capacitance =$row['capasitance'];          $adi_pn = $row['wwpn'];      }

and error while executing php: 

failed execute query:     have error in sql syntax; check manual corresponds mysql server version right syntax use near 'resource id #4' @ line 1 1064

your first mysql_query returning resource (a resultset) , assigning $capacitance. when execute mysql_query again in next line, $capacitance, resource, turned string - "resource #4", - not proper sql.

also note "bobby tables doesn't go school" not true: escape strings properly.

$capacitance = @mysql_query ("select distinct wwpn,  substr(val, 1, length(val) / 2) capacitor,                              substr(val, length(val) / 2+1) capasitance                                bom_csv boardnumber ='" . mysql_real_escape_string($board) . "' , qty<>'' , qty !='qty'", $connect) or die("failed execute query:<br />" . mysql_error(). "<br />" . mysql_errno()); while ...

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