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./othercms/ips_4.3.4/applications/cms/extensions/core/Uninstall/Databases.php
<?php
/**
 * @brief        File Storage Extension: Records
 * @author        <a href='https://www.invisioncommunity.com'>Invision Power Services, Inc.</a>
 * @copyright    (c) Invision Power Services, Inc.
 * @license        https://www.invisioncommunity.com/legal/standards/
 * @package        Invision Community
 * @subpackage  Content
 * @since        11 April 2014
 */

namespace IPS\cms\extensions\core\Uninstall;

/* To prevent PHP errors (extending class does not exist) revealing path */
if ( !defined( '\IPS\SUITE_UNIQUE_KEY' ) )
{
   
header( ( isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0' ) . ' 403 Forbidden' );
    exit;
}

/**
 * Remove custom databases
 */
class _Databases
{
   
/**
     * Constructor
     *
     *
     */
   
public function __construct()
    {
    }

   
/**
     * Uninstall custom databases
     *
     * @return void
     */
   
public function preUninstall( )
    {
        if ( \
IPS\Db::i()->checkForTable( 'cms_databases' ) )
        {
            foreach ( \
IPS\Db::i()->select( '*', 'cms_databases') as $db )
            {
               
/* The content router only returns databases linked to pages. In theory, you may have linked a database and then removed it,
                    so the method to remove all app content from the search index fails, so we need to account for that here: */
               
\IPS\Content\Search\Index::i()->removeClassFromSearchIndex( 'IPS\cms\Records' . $db['database_id'] );
            }
        }
    }

   
/**
     * Uninstall custom databases
     *
     * @return void
     */
   
public function postUninstall()
    {
       
/* cms_databases has been removed */
       
$tables = array();
        try
        {
           
$databaseTables = \IPS\Db::i()->query("SHOW TABLES LIKE '" . \IPS\Db::i()->prefix . "cms_custom_database_%'" )->fetch_assoc();
            if (
$databaseTables )
            {
                foreach(
$databaseTables as $row )
                {
                    if(
is_array( $row ) )
                    {
                       
$tables[] = array_pop($row);
                    }
                    else
                    {
                       
$tables[] = $row;
                    }
                }
            }

        }
        catch( \
IPS\Db\Exception $ex ) { }

        foreach(
$tables as $table )
        {
            if ( \
IPS\Db::i()->checkForTable( $table ) )
            {
                \
IPS\Db::i()->dropTable( $table );
            }
        }

        if ( isset( \
IPS\Data\Store::i()->cms_menu ) )
        {
            unset( \
IPS\Data\Store::i()->cms_menu );
        }
    }
}