Another connection within the try - php

Question

Good afternoon everyone, I have a doubt.
I have a SELECT with PDO. More must be done within another SELECT WHILE to get data for that select, giving it more
Error (Error: There Is Already an active transaction).
If anyone can help me be grateful.
Example code.
try{
$this->conex->beginTransaction();
$query = $this->conex->prepare("SELECT idUser FROM usuario WHERE id = :id ORDER BY data DESC LIMIT $pagin, $paginaF");
$query->bindParam(":id", $ID, PDO::PARAM_INT, 20);
$query->execute();
while ($lista = $query->fetch()){
$idUser = $lista['idUser'];
echo "<div id='avatar'>"box::avatar($idUser)."</div>"
}
//Here he works out of WHILE. Inside it does not work...
echo box::avatar($idUser);
$this->conex->commit();
}catch (PDOException $ex) {
echo "Erro: " . $ex->getMessage();
}
public function avatar($idUser){
$idUser = (int) $idUser;
$query = $this->conex->prepare("SELECT avatar FROM login WHERE id = :id LIMIT 1");
$query->bindParam(":id", $idUser, PDO::PARAM_INT, 20);
$query->execute();
while ($avatar = $query->fetch()){
$avatar = $avatar['avatar'];
}
return $avatar;
}

Answer 1

You have to close the cursor before calling for a new transaction.
Besides, may I ask why are you creating transactions since you're only doing simple *select*s?

Answer 2

Nested Transactions are not possible (as mentioned by the error message). In the first line, you start one transaction. Within the loop, you call avatar(), that starts another transaction, which fails, because there is already one.
However, for SELECT-Queries you dont need transactions at all. Just omit it.
You may also think about JOIN, so you can handle all in just one Query (and then transactions are really useless).

Answer 3

May not be an answer to the problem for now but this line :
echo "<div id="avatar">".$box = box::avatar($id)."</div>"
is full of errors.
" aren't escaped.
no ; at the end.
You're trying to give a value to a variable inside an echo. This'll throw an error.
If you don't use the avatar() function elsewhere, you can do :
try{
$this->conex->beginTransaction();
$query = $this->conex->prepare("SELECT usuario.id as id, login.avatar as avatar FROM usuario, login WHERE usuario.id = :id and usuario.id ORDER BY data DESC LIMIT $pagin, $paginaF");
$query->bindParam(":id", $ID, PDO::PARAM_INT, 20);
$query->execute();
while ($lista = $query->fetch()){
$id = $lista['id'];
$avatar = $lista['avatar']
echo '<div id="avatar">'.$avatar.'</div>';
}
}catch (PDOException $ex) {
echo "Erro: " . $ex->getMessage();
}