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Collection::existsInDatabaseCheck if collection exists in database


public mysql_xdevapi\Collection::existsInDatabase(): bool

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

Liste de paramètres

Cette fonction ne contient aucun paramètre.

Valeurs de retour

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.


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

= 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()) {
"The collection no longer exists in the database named addressbook. What happened?";
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