SQLAlchemy 是否支持多库，如何支持

可以看看http://stackoverflow.com/questions/13372001/multi-tenancy-with-sqlalchemy 提供的方案

After pondering on jd's answer I was able to achieve the same result for postgresql 9.2, sqlalchemy 0.8, and flask 0.9 framework:
from sqlalchemy import event
from sqlalchemy.pool import Pool
@event.listens_for(Pool, 'checkout')
def on_pool_checkout(dbapi_conn, connection_rec, connection_proxy):

tenant_id = session.get('tenant_id')
cursor = dbapi_conn.cursor()
if tenant_id is None:

cursor.execute("SET search_path TO public, shared;")

else:

cursor.execute("SET search_path TO t" + str(tenant_id) + ", shared;")

dbapi_conn.commit()
cursor.close()