how i can slove this error,SQLSTATE[42000]?

john :

please help me to solve this error.i tired from searching solution... error: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'WHERE name=NULL' at line 1

my database have 3 column=id(int),name(varchar),comment(varchar) and i want insert comment to it.

my php code :

<?php
include "./Config.php";
include './MyPDO.php';

  $response = array() ;
  $connect = MyPDO::getInstance();

  $name = $_REQUEST['name'];
  $comment=$_REQUEST['comment'];

        $query =  " INSERT INTO user "
                . " (comment) "
                . " VALUES "
                . " (:comment) "
                . " WHERE name=:name ";

        $stmt = $connect->prepare($query);
        $stmt->bindParam(":name",$name);
        $stmt->bindParam(":comment",$comment);
        try {
                $stmt->execute();
                $response['massage'] = "sucess";
                echo json_encode($response);
                exit;
        } catch (PDOException $ex) { 
                $response['massage'] = "error";
                $response['error']=$ex->getMessage();
                echo json_encode($response);
        }

juergen d :

Looks like you mixed the syntax here. You seem to want to update an existing record. Use

update user
set comment = :comment
where name = :name

insert if for creating a new record.

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