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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.
此函数没有参数。
示例 #1 mysql_xdevapi\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.