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?";
}
?>
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