Collection::existsInDatabase
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Collection::existsInDatabase — Check if collection exists in database
说明
public mysql_xdevapi\Collection::existsInDatabase
( void
) : bool
Checks if the Collection object refers to a collection in the database (schema).
参数
此函数没有参数。
返回值
Returns TRUE if collection exists in the database, else FALSE if it does not.
范例
Example #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?";
}
?>