Ajax adding content to a database

$("#add"). Click (function(){    varcode=$ ("#code").Val (); //val must be bracketed after varname=$ ("#name").Val (); $.Ajax ({URL: "Ajax_tianjiachu.php",Data: {C:code,n:name},type: "POST",//Submit methodDataType: "TEXT",//return string, T uppercaseSuccessfunction(data) {if(Data.Trim() = = "OK")//data.trim to remove the space to prevent error alert ("Add Success"); ElseAlert ("Add Failed");        }        }); })</script>

1<?PHP2 $code=$_post["C"];3 $name=$_post["N"];4 require"DBDA.class.php";5 $db=NewDbda ();6 $sql= "INSERT into nation values (' {$code}‘,‘{$name}‘)";//add quotation marks, plus brackets7 if($db->query ($sql, 0) //0 is added and deleted, 1 is add8 {9     Echo"OK";Ten     } One Else A{Echo"NO"; -}

Ajax adding content to a database