Shulou(Shulou.com)06/01 Report--

Python can use cursor.count () to determine whether the mongo query result is empty, and if it is 0, the query return result is empty.

Conn = pymongo.MongoClient (host= "192.168.3.6", port=27017)

Db = conn.testdb

Db.authenticate ("appuser", "apppass")

Mylog = db.system.profile

A = mylog.find ({"ts": {'$gt':tn}}) .sort ("ts", pymongo.ASCENDING)

If a.count () = = 0:

Print "query result is empty"

Else:

For i in a:

Print i

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