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Schema::existsInDatabase — Check if exists in database
Checks if the current object (schema, table, collection, or view) exists in the schema object.
本函数还未编写文档，仅有参数列表。
此函数没有参数。
true if the schema, table, collection, or view still exists in the schema, else false.
示例 #1 Schema::existsInDatabase example
<?php
$session = mysql_xdevapi\getSession("mysqlx://user:password@localhost");
$session->sql("DROP DATABASE IF EXISTS food")->execute();
$session->sql("CREATE DATABASE food")->execute();
$session->sql("CREATE TABLE food.fruit(name text, rating text)")->execute();
$schema = $session->getSchema("food");
$schema->createCollection("trees");
// ...
$trees = $schema->getCollection("trees");
// ...
// Is this collection still in the database (schema)?
if ($trees->existsInDatabase()) {
echo "Yes, the 'trees' collection is still present.";
}以上示例的输出类似于：
Yes, the 'trees' collection is still present.