ทำไม ทำไม ดูให้หน่อย โค้ดผิดตรงไหน Code php ในการ select และ update

<?
              $strSQL = "SELECT * FROM ink WHERE inkid = '".$_POST["inkid$i"]."' ";
			$objQuery = mysql_query($strSQL);
			$objResult = mysql_fetch_array($objQuery);	
			$inka = $objResult[totali];
			
			$_POST["totali2$i"] = $inka - $_POST["amount$i"];
			
			mysql_query("set NAMES tis620");
			mysql_query("set character_set_results=tis620"); 
			mysql_query("set character_set_connection=tis620"); 
			mysql_query("set character_set_client=tis620");					
			$strSQL1 = "UPDATE ink SET ";
			$strSQL1 .="totali = '".$_POST["totali2$i"]."' ";
			$strSQL1 .="WHERE inkid = '".$_POST["inkid$i"]."' ";
			$objQuery1 = mysql_query($strSQL1);
			
			$strSQL2 = "INSERT INTO takeink";
			$strSQL2 .= "(pid,pname,inkid,inkname,price,amountink,user,datet) ";
			$strSQL2 .= "VALUES ";
			$strSQL2 .= "('".$_POST["pid$i"]."','".$_POST["pname$i"]."'";
			$strSQL2 .= ",'".$_POST["inkid$i"]."','".$_POST["inkname$i"]."'";
			$strSQL2 .= ",'".$_POST["price$i"]."'";
			$strSQL2 .= ",'".$_POST["amount$i"]."','".$_POST["uname$i"]."')";
			$strSQL2 .= ",'".$_POST["datet$i"]."')";
			$objQuery2 = mysql_query($strSQL2);
?>