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Classe « Dialect »

Méthode sqlalchemy.Dialect.get_isolation_level_values

Signature de la méthode get_isolation_level_values

def get_isolation_level_values(self, dbapi_conn: 'DBAPIConnection') -> 'List[IsolationLevel]' 

Description

help(Dialect.get_isolation_level_values)

return a sequence of string isolation level names that are accepted
by this dialect.

The available names should use the following conventions:

* use UPPERCASE names.   isolation level methods will accept lowercase
  names but these are normalized into UPPERCASE before being passed
  along to the dialect.
* separate words should be separated by spaces, not underscores, e.g.
  ``REPEATABLE READ``.  isolation level names will have underscores
  converted to spaces before being passed along to the dialect.
* The names for the four standard isolation names to the extent that
  they are supported by the backend should be ``READ UNCOMMITTED``,
  ``READ COMMITTED``, ``REPEATABLE READ``, ``SERIALIZABLE``
* if the dialect supports an autocommit option it should be provided
  using the isolation level name ``AUTOCOMMIT``.
* Other isolation modes may also be present, provided that they
  are named in UPPERCASE and use spaces not underscores.

This function is used so that the default dialect can check that
a given isolation level parameter is valid, else raises an
:class:`_exc.ArgumentError`.

A DBAPI connection is passed to the method, in the unlikely event that
the dialect needs to interrogate the connection itself to determine
this list, however it is expected that most backends will return
a hardcoded list of values.  If the dialect supports "AUTOCOMMIT",
that value should also be present in the sequence returned.

The method raises ``NotImplementedError`` by default.  If a dialect
does not implement this method, then the default dialect will not
perform any checking on a given isolation level value before passing
it onto the :meth:`.Dialect.set_isolation_level` method.  This is
to allow backwards-compatibility with third party dialects that may
not yet be implementing this method.

.. versionadded:: 2.0

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