Allowed memory size of 8589934592 bytes exhausted
Questo tipo di errori è causato da una grande quantità di dati in memoria, quindi il modo per risolverlo è scrivere uno script di memoria meno pesante. Modificando memory_limit otteniamo solo una correzione temporale perché quando i nostri dati crescono, tornano indietro.
$campaigns = Campaign::all(); //at this point you are pulling the whole Campaigns table to memory.. and you pull some extra rows after that increasing even more the memory use
Come ho detto, Elloquent è poco efficiente nel fare questo tipo di attività, quindi prendiamo le righe del database come faceva mysqli, una per una:
$db = DB::connection()->getPdo(); //get a database connection instance
$main_query_sql = "SELECT * FROM Campaigns"; //write our query
$main_query = $db->prepare($main_query_sql); //prepare it to get executed
$main_query->execute(); //execute our query
$visits_denied_sql = "SELECT COUNT(*) as total FROM VISITS WHERE DENIED = 1 AND CAMPAIGN_ID ="; //let's prepare our aggregate queries
$visits_allowed_sql = "SELECT COUNT(*) as total FROM VISITS WHERE DENIED = 0 AND CAMPAIGN_ID ="; //I just assumed them so change it as you need
$visits_denied = null;
$visits_allowed = null;
while($campaign = $main_query->fetch()){ //fetch our rows one by one
//now we are getting an associative array from the db instead of a model so we cannot use it as a Laravel Model (we can't use ->save() method or eager loading)
$visits_denied = $db->prepare($visits_denied_sql.$campaign['id']);
$visits_denied = $visits_denied->execute();
$denied_visits = $visits_denied->fetch();
$visits_allowed= $db->prepare($visits_allowed_sql.$campaign['id']);
$visits_allowed= $visits_allowed->execute();
$allowed_visits = $visits_allowed->fetch();
$campaign['denied_visits'] = $denied_visits['total'];
$campaign['allowed_visits'] = $allowed_visits['total'] ;
//edit with the correct update sentence:
$insert_query_sql = "UPDATE CAMPAIGNS SET allowed_visits = :visits_allowed, denied_visits = :visits_denied WHERE id = :id";
$insert_query = $db->prepare($insert_query_sql);
$insert_query->bindParam(':visits_allowed', $campaign['allowed_visits']);
$insert_query->bindParam(':visits_denied', $campaign['denied_visits']);
$insert_query->bindParam(':id', $campaign['id']);
$insert_query->execute();
}
Prova questo all'interno del tuo programma e fammi sapere se ha funzionato!
