////////////////////////////////////////////////////////////////////////////////
/// @startDocuBlock databaseId
/// @brief return the database id
/// `db._id()`
///
/// Returns the id of the current database as a string.
///
/// @EXAMPLES
///
/// @EXAMPLE_ARANGOSH_OUTPUT{dbId}
///   require("internal").db._id();
/// @END_EXAMPLE_ARANGOSH_OUTPUT
/// @endDocuBlock
////////////////////////////////////////////////////////////////////////////////