PDO fetchAll（）给了我stdClass

Question

I am learning about PHP blobs and I got an issue with the data I am getting back.

Notice: Undefined property: stdClass::$

I am getting this for my results when I echo the column names in the foreach loop

$sql = "SELECT * FROM tbl_blobs";

$stmt = $db->prepare($sql);
$stmt->execute();
$stmt->bindColumn(1, $name);
$stmt->bindColumn(2, $mime);
$stmt->bindColumn(3, $data, PDO::PARAM_LOB);

$arr = [];

$items = $stmt->fetchAll(PDO::FETCH_OBJ);

foreach ($items as $item) {
    echo $item->name;
}

Is there a function I need to use to wrap the results in or am I missing a step?

Desired Outcome: => To have all the items in an array so it can be encoded into a JSON string. One of the items is a blob.

Output of array using var_dump($items);

array(5) { [0]=> object(stdClass)#3 (4) { ["ID"]=> string(1) "1" ["NAME"]=> string(7) "test123" ["IMAGE"]=> string(17861) (followed by a blob)

Answer 1

You could use PDO::FETCH_ASSOC instead of PDO:FETCH_OBJ it would directly return an associative array.

See fetchAll arguments for more options

Set it for the whole PDO instance

If you want to have this behavior for all your queries in your PDO connection, you can set it with:

$db = new \PDO('mysql:host='.$dbhost.';dbname='.$dbname, $dbusername, $dbpassword, [
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
]);

Another way it to set it after the PDO instanciation, with:

$db->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);

edit: added global alternatives