CryptoCurrencyData | Shows realtime Crypto Currency Market Table | Frontend Framework library
kandi X-RAY | CryptoCurrencyData Summary
kandi X-RAY | CryptoCurrencyData Summary
Shows realtime Crypto Currency Market Table, Chart(Data Visualization) using react-vis(uber), API, Serverside Rendered React.js, Redux, Node.js
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CryptoCurrencyData Examples and Code Snippets
Community Discussions
Trending Discussions on CryptoCurrencyData
QUESTION
I'm having an issue with my app, I'm creating a flutter app to track cryptocurrency prices. The issue is that I get the data properly from the API, then I print it into the counsel but when I try to display it inside the app, it displays null.
Here is the code I use to get the data from the API
...ANSWER
Answered 2020-Apr-25 at 19:29The problem is that getting api data is async task so it takes time, while build method build screen in that time, so it is printing null.
1) You can call setState at the end of function which change null to actual data when it gets from API.
QUESTION
I can't insert data in a table where 2 foreign keys refer to one primary key...
The code is as follows:
...ANSWER
Answered 2018-Nov-20 at 07:05Constrainsts are created to prevent corrupting data by inserting or updating your tables.
In your case, you are trying to insert data which is not existing. You are trying to insert into Currency_rate
values ID's
of Currency
which are not existing in Currency
table. So this is a whole goal of constraints - prevent corruption of data.
Just for demonstration purposes I've created Country
table:
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