python判断数据库返回结果是否为空
python判断mongo查询结果是否为空，可以使用cursor.count()来判断，为0则查询返回结果为空。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 "查询结果为空"
else:
for i in a:
print i
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