- Added new user-space accessors for viewing transaction isolation

levels; :meth:`.Connection.get_isolation_level`,
:attr:`.Connection.default_isolation_level`.
- enhance documentation inter-linkage between new accessors,
existing isolation_level parameters, as well as in
the dialect-level methods which should be fully covered
by Engine/Connection level APIs now.

1 files changed, 68 insertions, 3 deletions

diff --git a/lib/sqlalchemy/engine/interfaces.py b/lib/sqlalchemy/engine/interfaces.py
index 5f66e54b5..5f0d74328 100644
--- a/lib/sqlalchemy/engine/interfaces.py
+++ b/lib/sqlalchemy/engine/interfaces.py
@@ -654,17 +654,82 @@ class Dialect(object):
         return None
 
     def reset_isolation_level(self, dbapi_conn):
-        """Given a DBAPI connection, revert its isolation to the default."""
+        """Given a DBAPI connection, revert its isolation to the default.
+
+        Note that this is a dialect-level method which is used as part
+        of the implementation of the :class:`.Connection` and
+        :class:`.Engine`
+        isolation level facilities; these APIs should be preferred for
+        most typical use cases.
+
+        .. seealso::
+
+            :meth:`.Connection.get_isolation_level` - view current level
+
+            :attr:`.Connection.default_isolation_level` - view default level
+
+            :paramref:`.Connection.execution_options.isolation_level` -
+            set per :class:`.Connection` isolation level
+
+            :paramref:`.create_engine.isolation_level` -
+            set per :class:`.Engine` isolation level
+
+        """
 
         raise NotImplementedError()
 
     def set_isolation_level(self, dbapi_conn, level):
-        """Given a DBAPI connection, set its isolation level."""
+        """Given a DBAPI connection, set its isolation level.
+
+        Note that this is a dialect-level method which is used as part
+        of the implementation of the :class:`.Connection` and
+        :class:`.Engine`
+        isolation level facilities; these APIs should be preferred for
+        most typical use cases.
+
+        .. seealso::
+
+            :meth:`.Connection.get_isolation_level` - view current level
+
+            :attr:`.Connection.default_isolation_level` - view default level
+
+            :paramref:`.Connection.execution_options.isolation_level` -
+            set per :class:`.Connection` isolation level
+
+            :paramref:`.create_engine.isolation_level` -
+            set per :class:`.Engine` isolation level
+
+        """
 
         raise NotImplementedError()
 
     def get_isolation_level(self, dbapi_conn):
-        """Given a DBAPI connection, return its isolation level."""
+        """Given a DBAPI connection, return its isolation level.
+
+        When working with a :class:`.Connection` object, the corresponding
+        DBAPI connection may be procured using the
+        :attr:`.Connection.connection` accessor.
+
+        Note that this is a dialect-level method which is used as part
+        of the implementation of the :class:`.Connection` and
+        :class:`.Engine` isolation level facilities;
+        these APIs should be preferred for most typical use cases.
+
+
+        .. seealso::
+
+            :meth:`.Connection.get_isolation_level` - view current level
+
+            :attr:`.Connection.default_isolation_level` - view default level
+
+            :paramref:`.Connection.execution_options.isolation_level` -
+            set per :class:`.Connection` isolation level
+
+            :paramref:`.create_engine.isolation_level` -
+            set per :class:`.Engine` isolation level
+
+
+        """
 
         raise NotImplementedError()