twisted.flow.threads.QueryIterator

Package twisted :: Package flow :: Module threads :: Class QueryIterator |
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## Class QueryIterator

    Converts a database query into a result iterator

    from __future__         import generators
    from twisted.enterprise import adbapi
    from twisted.internet   import reactor
    from twisted.flow import flow
    from twisted.flow.threads import QueryIterator, Threaded

    dbpool = adbapi.ConnectionPool("SomeDriver",host='localhost',
                 db='Database',user='User',passwd='Password')

    # # I test with...
    # from pyPgSQL import PgSQL
    # dbpool = PgSQL

    sql = '''
      (SELECT 'one')
    UNION ALL
      (SELECT 'two')
    UNION ALL
      (SELECT 'three')
    '''
    def consumer():
        print "executing"
        query = Threaded(QueryIterator(dbpool, sql))
        print "yielding"
        yield query
        print "done yeilding"
        for row in query:
            print "Processed result : ", row
            yield query

    from twisted.internet import reactor
    def finish(result):
        print "Deferred Complete : ", result
        reactor.stop()
    f = flow.Deferred(consumer())
    f.addBoth(finish)
    reactor.run()

Method Summary
| `__init__(self, pool, sql, fetchmany, fetchall)`
| `__iter__(self)`
| `next(self)`
| `next_fetchall(self)`
| `next_fetchmany(self)`

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