create_engine *maybe* did something like this in the 0.1 series - it
would return a new engine, but its possible that it was using the
connection pool's manage() function to return a singleton instance of
the underlying pool. such magical things were ripped out of SA since
last april.
to create this functionality on your own, just use everyone's favorite
Singleton pattern:
import sqlalchemy
_engines = {}
def create_engine(url, **kwargs):
try:
return _engines[url]
except KeyError:
return _engines.setdefault(url, sqlalchemy.create_engine(url,
**kwargs)
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