I have been structuring my Firebase database so that messages end up being stored sequentially. Unfortunately, firebase must have made a change because now numbers no longer sort sequencially, so I have to store data a different way and still get the messages to come out in the correct order. The mainstream way to do this is to store a the message data by Auto ID. I do not understand how to properly retrieve the data though to get it back in the correct order. I have read a lot of code and docs and still that question lingers.
So, to clarify: This is what a message in my Database would look like:
id123
NAME: John
MESSAGE: Hi guys!
DATE: 11/11/16
TIME: 6:04 PM
I stored the id in that format ("id"+numberOfPost). It is considered good practice to store by Auto ID, but I do not know how to retrieve the data in its proper order. Ex. of my Database structure with Auto ID.
Kr7r2kupqerhrepqbuixd
NAME: John
MESSAGE: Hi guys!
DATE: 11/11/16
TIME: 6:04 PM
This would sort to be in the "K" section, and the post after it could start with a "B", making the database out of order. How do I structure the database to use Auto ID and yet be able to get messages in the proper order?
My code for posting a message looks like this:
self.firebase.child("Chats").child(chatID!).child("id\(counter)").child("MESSAGE").setValue(message!)
self.firebase.child("Chats").child(chatID!).child("id\(counter)").child("FIRST_NAME").setValue(fn!)
self.firebase.child("Chats").child(chatID!).child("id\(counter)").child("LAST_NAME").setValue(ln!)
self.firebase.child("Chats").child(chatID!).child("id\(counter)").child("ID").setValue(id!)
self.firebase.child("Chats").child(chatID!).child("id\(counter)").child("DATE").setValue(date!)
self.firebase.child("Chats").child(chatID!).child("id\(counter)").child("TIME").setValue(time!)
Thank you for your help!
Related
I am new to NoSQL and I'm trying to figure out a good way to represent my data. I have a series of workers that need to request vacations via mobile app.
When I try to write a Firebase query with Flutter, I can do this:
Firestore.instance
.collection("ferie_permessi")
.document("worker1#test.com")
.snapshot();
It works but there are two main errors:
If I try to create another collection called "Woker info" I cannot use worker1#test.com as document ID as it already esists;
I have to sort data client side because firestore doesn't give me the possibility (with this setup I've made).
I'm quite sure that this structure isn't good at all. Each worker needs to have 2 lists: vacations and other. What is wrong?
My guess is that I should move worker1#test.com together with vacations and other so that I can make a query of this kind:
Firestore.instance
.collection("ferie_permessi")
.where("user", "==", "worker1#test.com)
.snapshot();
But now the id? Is an automatic one good?
I had a chance to recently explore creating an app using a firebase-firestore. A couple of things will help here:
Yes, the autogenerated id is good since it is unique, for example, you can have a collections vacation_requests, users you can then use that user_id as a document in vaccation_requests -> user_id -> vacations, instead of using email as a document key.
Or
You can do it like this collections users, vacation_requests, and requests.
store user details in users.
store requests in requests with from and to dates.
store reference of User and Request in vaccation_requests.
Hope this helps!
We're experimenting with storing data to a MongoDB by using node-red. As it is now, we can store data on the database, but it seems like only the 'msg.payload' is stored (as document) - and not the whole msg object. Which confuses us a little...
The flow is very simple and nothing much has really been done.
We actually dont need ALL data, but we wish to store payload but also metadata as a document to our collection on our database. We've tried searching for an answer to this, but couldn't find anything relevant on how to do this. Hopefully we can get some help on this forum.
Thanks in advance! (btw. we're using mongodb3 on node-red to store data)
The node you are using is working as intended.
The normal pattern for Node-RED is that the focus of any given node is the msg.payload entry, any other msg properties are considered to be meta data.
The simplest thing here would be to use the built in core change node to move the other fields you are interested in to be properties of the msg.payload object.
Is it possible to track in the shoretel database who has silently monitored others calls? If so where is the data stored? tables?
Here is a basic sample query that will get you a list of calls that were silent monitor calls. There is obviously a lot of refining to do based on exactly what details you are looking for. Feel free to PM me if you want help with something more specific.
SELECT `call`.SIPCallId AS `GUID`
, `call`.StartTime AS `StartTime`
, `call`.Extension AS `DN`
, `call`.DialedNumber
FROM `call`
LEFT JOIN connect ON (`call`.ID = connect.CallTableID)
WHERE connect.connectreason = 21
ORDER BY `call`.Extension, `call`.StartTime
The where clause here limits your rows to only those with a reason code of 21, silent monitor. Look at the values in the connectreason table for more details on what reason codes are tracked.
PLEASE NOTE that this is in the CDR Database (port 4309, username of 'st_cdrreport' and readonly password of 'passwordcdrreport') you don't want to accidentally write to the CDR database...
I'm pretty confused concerning this hip thing called NoSQL, especially CloudantDB by Bluemix. As you know, this DB doesn't store the values chronologically. It's the programmer's task to sort the entries in case he wants the data to.. well.. be sorted.
What I try to achive is to simply get the last let's say 100 values a sensor has sent to Watson IoT (which saves everything in the connected CloudantDB) in an ORDERED way. In the end it would be nice to show them in a D3.css style kind of graph but that's another task. I first need the values in an ordered array.
What I tried so far: I used curl to get the data via PHP from https://averylongID-bluemix.cloudant.com/iotp_orgID_iotdb_2018-01-25/_all_docs?limit=20&include_docs=true';
What I get is an unsorted array of 20 row entries with random timestamps. The last 20 entries in the DB. But not in terms of timestamps.
My question is now: Do you know of a way to get the "last" 20 entries? Sorted by timestamp? I did a POST request with a JSON string where I wanted the data to be sorted by the timestamp, but that doesn't work, maybe because of the ISO timestamp string.
Do I really have to write a javascript or PHP script to get ALL the database entries and then look for the 20 or 100 last entries by parsing the timestamp, sorting the array again and then get the (now really) last entries? I can't believe that.
Many thanks in advance!
I finally found out how to get the data in a nice ordered way. The key is to use the _design api together with the _view api.
So a curl request with the following URL / attributes and a query string did the job:
https://alphanumerical_something-bluemix.cloudant.com/iotp_orgID_iotdb_2018-01-25/_design/iotp/_view/by-date?limit=120&q=name:%27timestamp%27
The curl result gets me the first (in terms of time) 120 entries. I just have to find out how to get the last entries, but that's already a pretty good result. I can now pass the data on to a nice JS chart and display it.
One option may be to include the timestamp as part of the ID. The _all_docs query returns documents in order by id.
If that approach does not work for you, you could look at creating a secondary index based on the timestamp field. One type of index is Cloudant Query:
https://console.bluemix.net/docs/services/Cloudant/api/cloudant_query.html#query
Cloudant query allows you to specify a sort argument:
https://console.bluemix.net/docs/services/Cloudant/api/cloudant_query.html#sort-syntax
Another approach that may be useful for you is the _changes api:
https://console.bluemix.net/docs/services/Cloudant/api/database.html#get-changes
The changes API allows you to receive a continuous feed of changes in your database. You could feed these changes into a D3 chart for example.
I'm coding an IM system.
I'm using Redis and JSON to store the data. I have a Redis Set with the conversation IDs. When I retrieve them, I would like to get the list sorted by the timestamp of the messages:
conversation 9 -> last message timestamp: 1390300000
conversation 12 -> last message timestamp: 1390200000
conversation 7 -> last message timestamp: 1390100000
I have a Set with the conversations where each user participates (user1337:conversations) and a List with the JSON-encoded messages of each conversation (conversation1234:messages).
I guess there is no need for tricks, so it can be done natively with Redis. How would you manage to achieve this?
Sounds like a Sorted Set is exactly what you need.
You would set the timestamp of each conversation as its score (see ZADD) and then you can retrieve them ordered, using commands like ZRANGE, ZRANGEBYSCORE, ZREVRANGE and ZREVRANGEBYSCORE.