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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.
本函數還未編寫(xiě)文檔，僅有參數列表。
此函數沒(méi)有參數。
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.";
}
以上例程的輸出類(lèi)似于：
Yes, the 'trees' collection is still present.