php pdo选择查询不起作用[关闭]

i'm new to php PDO, i've made a query to select users in db and display them in a html table but i get no result, and there is no error message. print_r($connexion) returns PDO Object ( )

here is the code. thanks for your help!

connexion to db //connexion.php

function connexion(){

try {
   $dns = 'mysql:host = localhost; dbname = pruf';
   $utilisateur = 'root';
   $motDePasse = '';
   $connexion = new PDO($dns, $utilisateur, $motDePasse, array(
   PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8'
   ));
} 

catch (Exception $ex) {
   echo "connexion à Mysql impossible", $ex->getMessage();
   die('ok');
}

return $connexion;

query file //searchInvite.php

<!DOCTYPE HTML>
<head>
    <meta charset="utf-8"
</head>
<html>
<table border="1px">
    <tr>
        <td>Nom</td>
        <td>Prenom</td>
        <td>Fonction</td>
        <td>Titre</td>
        <td>Adresse</td>
</tr>

<?php
    require_once 'connexion.php';

   $connexion = connexion();
   print_r($connexion); 
   $query = "SELECT nom, prenom, fonction, titre_grade, adr_pro_voie FROM invite ORDER BY id LIMIT 0 , 30";

   $stmt = $connexion->prepare($query);


   $stmt->execute();

   while ($enregistrement = $stmt->fetchAll(PDO::FETCH_OBJ)){

?>

    <tr>
        <td><?php echo $enregistrement->nom; ?></td>
        <td><?php echo $enregistrement->prenom; ?></td>
        <td><?php echo $enregistrement->fonction; ?></td>
        <td><?php echo $enregistrement->titre_grade ?></td>
        <td><?php echo $enregistrement->adr_pro_voie; ?></td>
    </tr>


<?php 
}

?>
 </table>

Hmm Here is your code:

PHP Code [index.php]:

<!DOCTYPE HTML>
<head>
<meta charset="utf-8" </head>
<html>
<body>
<table border="1px">
    <tr>
        <td>Nom</td>
        <td>Prenom</td>
        <td>Fonction</td>
    </tr>
<?php
require_once 'connection.php';
$DBH = connection();
# creating the statement
$STH = $DBH->prepare("SELECT nom, prenom, fonction, titre_grade, adr_pro_voie FROM invite ORDER BY id LIMIT 0 , 30");
# setting the fetch mode  
$STH->setFetchMode(PDO::FETCH_OBJ);
# run the query
if ( $STH->execute()){
# showing the results  
while($enregistrement = $STH->fetch()) {  
?>
    <tr>
        <td><?php echo $enregistrement->nom; ?></td>
        <td><?php echo $enregistrement->prenom; ?></td>
        <td><?php echo $enregistrement->fonction; ?></td>
        <td><?php echo $enregistrement->titre_grade ?></td>
        <td><?php echo $enregistrement->adr_pro_voie; ?></td>
    </tr>

<?php }
}else {
    // if not run pdo statement send error
    $error = $STH->errorInfo();
    echo $error[2];
} ?>

</table>
</body>
</html>

PHP Code [connection.php]

function connection() {
    // try catch block start
    try {
        // use native pdo class and connect
        $DBH = new PDO("mysql:host=localhost;dbname=pruf", 'root', '', array(
            PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8"
        )); 
    }
    catch (PDOException $e) {
        // get pdo error and pass on error method
        die("ERROR in establish connection: " . $e->getMessage());
    }
    return $DBH;
}

Some suggestions:

 1. Check your DB name
 2. Check your user name
 3. Check your password
 4. Check your server
 5. Check if user privilege access database
 6. Check table name, try to dry run query.