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QUESTION
I building chat application with pubnub,
I have setup everything both backend and frontend,
but in front-end, it requires another argument for UUID. Can anyone tell me where can i get the UUID? how to generate it with pubnub? Do i need to store the UUID in my datbase?
...ANSWER
Answered 2021-Jun-12 at 17:32The UUID should be something that, as the acronym implies, uniquely identifies the user (or device, server instance, etc.). The UUID can be whatever you see fit to accomplish this in your applications but there are some guidelines you should follow with respect to PubNub.
This is well-documented in the PubNub Platform Documentation, so I am not going to repeat all of that here. Please review Users & Devices: Identity Management docs, under the Connections section, for the full story.
TL;DR- Generate a UUID for the user when they register as a new user and store it in their user profile record in your system (or use PubNub Objects: UUIDMetadata).
- Upon successful registration/login of a user, pass the following back to the user (the client PubNub application):
- subscribe key
- publish key (only need if client can send messages)
- uuid (there are UUID generator APIs in PN SDKs - you can make your own but you should avoid using any PII as the UUID).
- auth key (this has to do with PubNub Access Manager and not related to this post, but should be implemented for production applications)
- use the above to init your PubNub object
- each user/client/device should use the same UUID everytime the PubNub object is created
- each server instance should have its own UUID. This can simply be a server instance name or identifier
Again, it's all detailed in the same docs page under the UUID Impact section, but here's the highlights:
- For billing purposes - it is used to calculate MAUs (Monthly Active Users)
- For Presence service to work properly - uuid value is used to generate
join
event when a user subscribes to a channel and for all presence events and APIs. - For easy troubleshooting - if you ever have to contact PN Support, it makes it a lot easier to identify a user across multiple subscribes and other API calls if we can single out a UUID.
Have a Realtime Day!!! ;)
QUESTION
I created an alertDialog which basically contains two editTexts to enter the data(component Id, component name).When the user clicks on yes button in the alert dialog new component is added to the datbase(as of now I haven't added any on click listeners for yes and no buttons in the dialog) but for some reason I can't get the data from the edit text. I'm new to android app development please help me out guys.....Thanks in Advance :)
Note : 1. I'm using viewModel.flag so that the alertDialog stays persistent with rotations.
- onCancel() method simply cancels the alertDialog(I intend to use this for updating certain parameters).
This is kotlin code which creates the alert dialogs.
...ANSWER
Answered 2021-Apr-17 at 08:53To get the text inside the EditText you need to do editText.getText().toString()
and NOT editText.toString()
which you have in your code.
In your code, editText.toString()
will return the string representation of the editText object. See the documentation of String's toString()
method here.
QUESTION
I am currently trying to get my database that I created to display on my Djnago server however I keep getting errors for my FruitModel saying that there are no objects however I have created objects for the FruitModel in my datbase using "record = FruitModel.objects.create(name='banana', price='4.00'). I am also getting an unable to display error for my urls when I loaded up my server. Here is my code for Views.py and for urls.py:
...ANSWER
Answered 2021-Apr-02 at 08:46You need this changes:
QUESTION
I am trying to find a way to SUM data in one column of my datbase on a SELECT statement if the Date column has the same day. My table would have three columns: Ticker, Mentions and Data. Ticker for this example would be BTC, there might be 10 rows and those ten rows have different mention counts(INT) for each one. Then the Date: 4 might have 2021-02-24, 5 might have 2021-02-25 and 1 might have 2021-02-23.
What I would like my SELECT statement to do is check that if the DAY is the same that it SUMs Mentions for that day and returns it as one INT. So in this case 3 INTs would be returned. A sum of the 24th, a sum of the 25th and then the single mention count of the 23.
Currently my SELECT looks like this:
...ANSWER
Answered 2021-Feb-25 at 05:53Give this sql fiddle a try, Barmar basically stated the answer:
QUESTION
I am trying - Using the following queries - to add a new Boolean field with a TRUE default value in MS Access 2007 datbase, but it doesn't work. As it always set the default value FALSE.
...ANSWER
Answered 2021-Jan-13 at 00:17Include the DEFAULT
keyword after the data type. You should be able to use either of the ones that you tried (BIT
, LOGICAL
, or YESNO
)
QUESTION
My aim is to develop a database for Customer, so that I started creating a Datbase.h, Database.cpp and the classical main.cpp. When I run i received the following error:
"AddCustomer" was not declared for this scope
In Database.cpp you find only an example. I am convinced there is something in the class that doesn't work well, but I don't know. Where is the mistake according to you? Many thanks, I am becoming crazy
main.cpp
...ANSWER
Answered 2020-Dec-24 at 17:23The error is due to the reason that you have used AddCustomer() inside the case of switch statement, which the compiler is expecting to be avaialble in the global scope, hence can't find it.
Since it's a member function of the Database class, you will need to access it through an object. For eg.
QUESTION
Im trying to connect to my microsoft access datbase stored locally on my PC using pythons pyodbc
but I keep getting a long error. Heres my code.
ANSWER
Answered 2020-Nov-09 at 01:48Not sure what your exact situation is, but it's likely not a programming error but an installation / environment error. I have a standard install of 64-bit office and connect to it from 64-bit Python. And that works with your provided code.
You may want to check if you are perhaps trying to use a 32-bit driver from 64-bit Python or the other way around, but given the error message, that didn't seem too likely.
If that doesn't resolve it, a recommendation would be to try the same code on another machine / user account and see if you can identify differences if it does work there.
QUESTION
I have a docker image for mysql datbase.
The first time I made this work I backed up my db to a .sql file and then from my docker-compose I build up the dabase.
Now however I have made some updates, created a new .sql file and again through the docker-compose I thought I would get my new data and new changes.
my docker-comose file:
...ANSWER
Answered 2020-Oct-18 at 21:32initdb scripts are only executed when your data directory (/var/lib/mysql
) is empty.
Your data are not cached, but persisted to your host using your volume. So if this is a development work, you can simply delete the contents of db_data
volume (or deleting and creating it again):
QUESTION
Im using the following to get all points from my hive datbase that are within 200m of my center.
...ANSWER
Answered 2020-Oct-08 at 13:30You can make a LineString from each chosen point paired with the center, then call GeodesicLengthWGS84 on each such LineString. It would be the same Length call as you have in the where
clause, but also added to the column projections (so something like select *, ST_GeodesicLengthWGS834(...) from ...
.
(disclosure: collaborator on Esri Spatial Framework for Hadoop)
QUESTION
I currently aggregate a query to get a unique list of strings used in my endpoint. As of now, the fetched data looks like this:
...ANSWER
Answered 2020-Sep-12 at 19:34You can do this with collections.Counter
:
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