- [feature] Added a new system

for registration of new dialects in-process
without using an entrypoint.  See the
docs for "Registering New Dialects".
[ticket:2462]

1 files changed, 28 insertions, 0 deletions

diff --git a/lib/sqlalchemy/dialects/__init__.py b/lib/sqlalchemy/dialects/__init__.py
index 2d4832412..16eb32e21 100644
--- a/lib/sqlalchemy/dialects/__init__.py
+++ b/lib/sqlalchemy/dialects/__init__.py
@@ -17,3 +17,31 @@ __all__ = (
     'sqlite',
     'sybase',
     )
+
+from sqlalchemy import util
+
+def _auto_fn(name):
+    """default dialect importer.
+    
+    plugs into the :class:`.PluginLoader`
+    as a first-hit system.
+    
+    """
+    if "." in name:
+        dialect, driver = name.split(".")
+    else:
+        dialect = name
+        driver = "base"
+    try:
+        module = __import__('sqlalchemy.dialects.%s' % (dialect, )).dialects
+    except ImportError:
+        return None
+
+    module = getattr(module, dialect)
+    if hasattr(module, driver):
+        module = getattr(module, driver)
+        return lambda: module.dialect
+    else:
+        return None
+
+registry = util.PluginLoader("sqlalchemy.dialects", auto_fn=_auto_fn)
\ No newline at end of file