Schema::existsInDatabase

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Schema::existsInDatabase — Check if exists in database

说明

public mysql_xdevapi\Schema::existsInDatabase(): bool

Checks if the current object (schema, table, collection, or view) exists in the schema object.

参数

此函数没有参数。

返回值

true if the schema, table, collection, or view still exists in the schema, else false.

示例

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.