[英]How do I compare records in MongoDB for uniqueness based on a field in python using pymongo?
I have a collection with some records and I want to insert only unique values in the collection. 我有一个包含一些记录的集合,我只想在集合中插入唯一值。 I need to compare the new data with old to check if it already exists.
我需要将新数据与旧数据进行比较,以检查其是否已存在。 If it doesn't exist, then insert it in the collection.
如果不存在,则将其插入集合中。 I'm using pymongo - create_index(), but I don't know if it's the right way to do it.
我正在使用pymongo-create_index(),但我不知道这是否是正确的方法。
First You Have To check if the record exists in the database or not 首先,您必须检查记录是否存在于数据库中
duplicates = collection.find_one(<query>)
Then if duplicates does not exist then Insert 然后,如果不存在重复项,则插入
# check duplicate
if duplicates == None:
# Insert
else:
pass
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