Upon re-reading some of the docs, I realized that my problem may still
be that initial connection. The create-engine doesn't actually
*connect* to the database, it just sets things up. That means that my
actual connection happens later, when I try to reflect or use automap.
When that happens, the connection starts up and the script hangs. I'm
no closer to solving this, and would love to hear anyone's thoughts,
but at least I know that my thought of blaming reflect/automap is
likely incorrect.
On 2/16/16, Alex Hall <ah...@autodist.com> wrote:
> Hi list,
> Sorry for all the emails. I've determined that my script is actually
> connecting to the 400's test database. At least, a print statement
> placed just after the create_engine call is printing, so I guess we're
> good there.
>
> What I'm running into now is unresponsiveness when I try to reflect or
> automap the database so I can do some basic queries. As soon as I call
> either
> automap.prepare(dbEngine, reflect=True)
> or
> metadata = MetaData()
> metadata.reflect(dbEngine, only=['tableName'])
>
> the script stops, hanging there with no response at all. The same
> thing happened when I was trying to use an inspector on the engine.
> It's an AS400, so taking a few seconds is a very long time for it.
> This is being left to run for minutes and isn't doing anything. What,
> if anything did I do wrong syntactically? Is there a better way to
> check that my engine is actually ready to go, or some other check I
> should be making? The full script, minus anything sensitive, is below.
>
> import globals
> import logging
> from sqlalchemy import *
> from sqlalchemy.engine import reflection
> from sqlalchemy.ext.automap import automap_base
> from sqlalchemy.ext.declarative import declarative_base
> from sqlalchemy.orm import sessionmaker
>
> logger = logging.getLogger(globals.appName+"."+__name__)
>
> #set up the sqlalchemy objects
> logger.debug("Creating database engine, base, and session.")
> dbEngine =
> create_engine("ibm_db_sa://"+user+":"+pwd+"@"+server+":"+port+"/"+dbName)
> print "connected"
> Session = sessionmaker(bind = dbEngine) #note that's a capital s on Session
> session = Session() #lowercase s
> metadata = MetaData()
> logger.debug("Creating session.")
> print "Creating automap base"
> base = automap_base()
> print "setting up automapping"
> #base.prepare(dbEngine, reflect=True)
> metadata.reflect(dbEngine, only=['tableName'])
>
> def getOrderByNumber(orderID):
> orders = base.classes.ORHED
> order = session.query(orders).filter(orders.OAORNO==orderID).first()
> print order.OAORNO
> #end def getOrderByNumber
>
> getOrderByNumber("AA111")
>
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