如何修复发送查询到MySQL？ PHP错误

Question

I have setting the code and query with database. I think everything is correct with PDO Connection to MySQL but the record did not go to the database.

// Includes start // Connection

<?php   
    $DSN = 'mysql:host = localhost; dbname = cms4.2.1';
    $ConnectingDB = new PDO($DSN, 'root', '');
?>

// Redirect function

<?php
    function Redirect_to($New_Location) {
            header("Location:".$New_Location);
        exit;
    }
?>

// Errors handling

<?php
    session_start();

    function ErrorMessage(){
        if (isset($_SESSION["ErrorMessage"])){
            $Output = "<div class=\"alert alert-danger\">";
            $Output .= htmlentities($_SESSION["ErrorMessage"]);
            $Output .= "</div>";
            $_SESSION["ErrorMessage"] = null;
            return $Output;
        }
    }

    function SuccessMessage() {
        if (isset($_SESSION["SuccessMessage"])) {
            $Output = "<div class=\"alert alert-success\">";
            $Output .= htmlentities($_SESSION["SuccessMessage"]);
            $Output .= "</div>";
            $_SESSION["SuccessMessage"] = null;
            return $Output;
        }
    }
?>

// Includes End

// The code

<?php require_once("Includes/DB.php"); ?>
<?php require_once("Includes/Functions.php"); ?>
<?php require_once("Includes/Sessions.php"); ?>

<?php
   if (isset($_POST["Submit"])) {
      $Category = $_POST["CategoryTitle"];
      $Admin = "Abdullah";
     date_default_timezone_set("Asia/Riyadh");
     $CurrentTime = time();
     $DateTime = strftime("%B-%d-%Y %H:%M:%S", $CurrentTime);
     if (empty($Category)) {
        $_SESSION["ErrorMessage"] = "All fields must be filled out";
        Redirect_to("Categories.php");
     } else if (strlen($Category) < 3) {
        $_SESSION["ErrorMessage"] = "Category is short";
        Redirect_to("Categories.php");
     } else if (strlen($Category) > 49) {
        $_SESSION["ErrorMessage"] = "Category is too long";
        Redirect_to("Categories.php");
     } else {
       // Insert to database
       // The problem starts here I think
       global $ConnectingDB;
       $sql = "INSERT INTO category(title,author,datetime)";
       $sql .= "VALUES(:categoryName,:adminName,:dateTime)";
       $stmt = $ConnectingDB->prepare($sql);
       $stmt -> bindValue(':categoryName',$Category);
       $stmt -> bindValue(':adminName',$Admin);
       $stmt -> bindValue(':dateTime',$DateTime);
       $Execute = $stmt -> execute();

       if ($Execute) {
       $_SESSION["SuccessMessage"] = "Category Added Successfully";
          Redirect_to("Categories.php");
       } else {
          $_SESSION["ErrorMessage"] = "Something went wrong";
          Redirect_to("Categories.php");
       }
   }
}
?>

The execute message always keeps "Something went wrong"

When I go to normal MySQL query system everything is ok. But I want to complete my work on PDO.

Answer 1

I think you can use pdoexception

then you will be able to print your errors and exceptions.

try{
   $stmt = $ConnectingDB->prepare($sql);
   $stmt -> bindValue(':categoryName',$Category);
   $stmt -> bindValue(':adminName',$Admin);
   $stmt -> bindValue(':dateTime',$DateTime);
   $Execute = $stmt -> execute();
}catch( PDOException $e ) {
  print $e->getMessage();
}

pdo should i try/catch every query?

Hope that help you.

Answer 2

Try inserting space before VALUES or after the closing bracket of the first row just like I did below, sometimes the query doesn't work because of bad written syntax.

 $sql = "INSERT INTO category(title,author,datetime) ";

OR

$sql .= " VALUES(:categoryName,:adminName,:dateTime)";

This might not be the problem but it's good practice.