Schema::existsInDatabase

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Schema::existsInDatabase — Check if exists in database

說明

public mysql_xdevapi\Schema::existsInDatabase(): bool

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

警告

本函數(shù)還未編寫文檔，僅有參數(shù)列表。

參數(shù)

此函數(shù)沒有參數(shù)。

返回值

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

范例

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.";
}

以上例程的輸出類似于：

Yes, the 'trees' collection is still present.