I'm trying to use sqlalchemy from a twisted application (by running all
blocking queries using deferToThread). Is it possible to yield from within
the function running in deferToThread? For example:
def threadRunQuery(engine, query):
conn = engine.connect()
res = conn.execute(query)
while True:
results = res.fetchmany(1000)
if not results:
break
yield results
@defer.inlineCallbacks
def stream_results():
engine = sqlalchemy.create_engine(...)
query = "select * from table"
result_iter = yield threads.deferToThread(threadRunQuery, engine, query)
for results in result_iter:
print results
It seems that the thread returns a generator, and so everything within
threadRunQuery is actually running on the main reactor thread. Is there
anyway to stream back results from a deferToThread?
Regards
Naveen Michaud-Agrawal
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