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Query with WHERE clause not working using mysqli bind_param() – Phpmyadmin

I am creating a webservice where I need to get some data from mysql and retrieve it in a mobile app.

I have been trying all day to do a query with a WHERE statement, but no success.

The normal query, without the WHERE is working perfectly though.

Also I went through all the similar questions on stack overflow and other forums, but none is the same problem as mine.

This is my current code: 

<?php

$con=mysqli_connect("Hidden credentials");

if (mysqli_connect_errno())
{
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
}

if ($stmt = $con->prepare("SELECT 
team.id as teamId,
team.team_name as teamName, 
user.id as userId, 
user.username as username, 
team_members.role as role

FROM team_members 
inner join user on team_members.user_id = user.id 
inner join team on team_members.team_id = team.id 
where user.id = ?
")) { 
   $stmt->bind_param("i", $id); 
   $stmt->execute(); 
   $result = $stmt->get_result();

$resultArray = array();
 $tempArray = array();

 while($row = $result->fetch_object())
 {
    $tempArray = $row;
    array_push($resultArray, $tempArray);
 }

 echo json_encode($resultArray);

 $stmt->close();

}
?>

If I remove the line where user.id=? it gets the data correctly.

Running the query on phpMyAdmin is everything ok, so it’s not any issue on the query.

Tags:

2

Answers


  1. 0

    Your QUERY doesn’t work because your variable id doesn’t exists (in code what you showing).

    Fix: create variable id and put some data to this variable.

    For example:

    $id = 5;

    Or dynamcially:

    From URL with GET method:

    $id = $_GET['id'];
    • this allows you to get parameter from URL. But you must set this parameter by link. For example: <a href="index.php?id=5">. By clicking on this a tag you will be redirected to page index.php with parameter id which equals to 5.

    From POST method:

    for example you have this FORM:

    <form method="post">
    <input type="number" name="id">
    <input type="submit" name="submit">
</form>

    • after submiting this FORM values will be saved in $_POST. You can access them by $_POST["name"]. In this case $_POST["id"].

      $id = $_POST[“id”];

    From SESSION:

    $id = $_SESSION["id"];
    • but first you have define $_SESSION["id"]. You can access this variable ($_SESSION[“id”]) in other pages of your domain.
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  2. 0

    The variable $id doesn’t exist (in your code). If you want to set the variable dynamically you can use $id = $_GET['id'];. This will take the value from the url and put it in the variable!

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