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Collection::existsInDatabase

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Collection::existsInDatabaseCheck if collection exists in database

Beschreibung

public mysql_xdevapi\Collection::existsInDatabase(): bool

Checks if the Collection object refers to a collection in the database (schema).

Parameter-Liste

Diese Funktion besitzt keine Parameter.

Rückgabewerte

Returns true if collection exists in the database, else false if it does not.

A table defined with two columns (doc and _id) is considered a collection, and a third _json_schema column as of MySQL 8.0.21. Adding an additional column means existsInDatabase() will no longer see it as a collection.

Beispiele

Beispiel #1 mysql_xdevapi\Collection::existsInDatabase() example

<?php
$session
= mysql_xdevapi\getSession("mysqlx://user:password@localhost");
$session->sql("DROP DATABASE IF EXISTS addressbook")->execute();
$session->sql("CREATE DATABASE addressbook")->execute();

$schema = $session->getSchema("addressbook");
$create = $schema->createCollection("people");

// ...

$collection = $schema->getCollection("people");

// ...

if (!$collection->existsInDatabase()) {
echo
"The collection no longer exists in the database named addressbook. What happened?";
}
?>
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