Schema::findTables

public Schema::findTables($table_expression)

public function findTables($table_expression) {
  $tables = [];

  // The SQLite implementation doesn't need to use the same filtering strategy
  // as the parent one because individually prefixed tables live in their own
  // schema (database), which means that neither the main database nor any
  // attached one will contain a prefixed table name, so we just need to loop
  // over all known schemas and filter by the user-supplied table expression.
  $attached_dbs = $this->connection->getAttachedDatabases();
  foreach ($attached_dbs as $schema) {
    // Can't use query placeholders for the schema because the query would
    // have to be :prefixsqlite_master, which does not work. We also need to
    // ignore the internal SQLite tables.
    $result = $this->connection->query("SELECT name FROM " . $schema . ".sqlite_master WHERE type = :type AND name LIKE :table_name AND name NOT LIKE :pattern", array(
      ':type' => 'table',
      ':table_name' => $table_expression,
      ':pattern' => 'sqlite_%',
    ));
    $tables += $result->fetchAllKeyed(0, 0);
  }

  return $tables;
}