如何使用 pymongo 查找 2 个特定日期的数据

Question

I´m pretty new to MongoDB and have of course googled this problem but most of the results only refer to getting the data between 2 dates. The Timestamp column in my db looks like this:

TIMESTAMP :2022-08-21T08:02:21.000+00:00

I want get all documents that match a specific date. I know that the timedelta is a weird way of doing this but I wanted to play around a bit. Anyway my problem is that the code below gives me exactly 1 document even though there should be houndreds. Another problem is that I haven´t found a solution to bypass the need for a start and end time for both dates so that I can just use

"$and":[ {"TIMESTAMP": {'$eq': today, '$eq': past}]

Code:

def delta(timeframe):
        from datetime import datetime, timedelta
        #subtract time
        search_column = "TIMESTAMP"
    
        if timeframe == "1":
            today = datetime.today()    
            past = today - timedelta(days=1)
            #format dates
            today_end = datetime.strftime(today, '%Y-%m-%d' + " 23:59:59")
            today_start = datetime.strftime(today, '%Y-%m-%d' + " 00:00:00")
            past_start = datetime.strftime(past, '%Y-%m-%d' + " 00:00:00")
            past_end = datetime.strftime(past, '%Y-%m-%d' + " 23:59:59")
            print(past_end,past_start)
            #convert strings to datetime
            past_start = datetime.strptime(past_start, "%Y-%m-%d %H:%M:%S")
            today_start = datetime.strptime(today_start, "%Y-%m-%d %H:%M:%S")
            past_end = datetime.strptime(past_end, "%Y-%m-%d %H:%M:%S")
            today_end = datetime.strptime(today_end, "%Y-%m-%d %H:%M:%S")
    
          
            a = collection.find({"$and":[ {"TIMESTAMP": {'$lt': today_end, '$gte': today_start},"TIMESTAMP": {'$lt': past_end, '$gte': past_start}}]})
            list_cur = list(a) #convert the cursor to the list of dictionary.
            df = pd.DataFrame(list_cur)
            #b= json.loads(dumps(a))
            print(df)

Thanks:)

Answer 1

Your curly brackets are misplaced. $and and $or operator, contains a list of conditions. So each of your condition should be a new element in the array.

{"$or":[ 
    {"TIMESTAMP": {'$lt': today_end, '$gte': today_start}},
    {"TIMESTAMP": {'$lt': past_end, '$gte': past_start}}
]}

This can be translated to:

I want all the documents where (TIMESTAMP is between today_end and today_start) or (TIMESTAMP is between past_end and past_start)

PS: I think you need to use $or