bb8 | featured async postgres connection pool | Database library
kandi X-RAY | bb8 Summary
kandi X-RAY | bb8 Summary
A full-featured connection pool, designed for asynchronous connections (using tokio). Originally based on r2d2. Opening a new database connection every time one is needed is both inefficient and can lead to resource exhaustion under high traffic conditions. A connection pool maintains a set of open connections to a database, handing them out for repeated use. bb8 is agnostic to the connection type it is managing. Implementors of the ManageConnection trait provide the database-specific logic to create and check the health of connections.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of bb8
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Trending Discussions on bb8
QUESTION
I have 2 arrays coming from my MongoDB database, one called users that returns a list of user objects like this:
...ANSWER
Answered 2022-Feb-05 at 04:39You can write a simple function to retrieve the full name.
QUESTION
I want to integrate jQuery DataTable with my Blazor Wasm project. So I add reference to these files:
//cdn.datatables.net/1.11.4/css/jquery.dataTables.min.css
//cdn.datatables.net/1.11.4/js/jquery.dataTables.min.js
and write this function to call appropriate initial function:
...ANSWER
Answered 2022-Jan-30 at 16:43Update
With async loading it gets hairier. jQuery will capture the data, that has to happen at exactly the right moment.
QUESTION
I have some postcode data alongside longitude and latitude data which I am using to plot certain types of crimes across the UK using the Leaflet package. I am trying to do this using Rshiny
I have manged to plot these locations of crimes. What I however want is to be able to filter all crimes from a particular location by radius. For example, if I type in a postcode e.g. RG1 3YL, I will be able to filter all crimes within a radius that the user is able to select e.g 5 miles, 10 miles etc.
Below I include the app, alongside the values for the crime dataset
...ANSWER
Answered 2021-Jul-07 at 08:36Here are some modifications that use the postcodes of the crime data.
QUESTION
I am having issue to use Stream
with actix-web using bellow code:
ANSWER
Answered 2021-Mar-01 at 21:36To make this work, we need to change the code such that the stream has ownership of the connection it is reading from, and due to how bb8 is written, you also need ownership of a handle to the pool. The best way to do this is to use the async-stream
crate.
I believe something like this should do it:
QUESTION
the original sql is:
...ANSWER
Answered 2020-Jul-09 at 09:53I believe you can do that if you simply remove col2
from your select and group by. Because col2
will no longer be returned, you should also remove the having statement. I think it should look something like this:
QUESTION
I wrote some code for testing optional properties in Swift, but the code crashed with error messages I couldn't quite understand. I used an online compiler which use Swift Release 5.01.
FYI, the error message is appended to the end of the post. It may be a little long and confusing to read. Thank you for your time.
Please help me by pointing out the problem in the code below:
...ANSWER
Answered 2020-Jun-20 at 08:52You seem to be using an online compiler which could be faulty or outdated. Approach their support team and inform them about this issue. Your code works perfectly on Xcode-playgrounds. You can get it here (It's Mac or iPad only).
QUESTION
Issue: I am trying to check for vowels within a class attribute.
The goal is to use 'a' or 'an' depending on whether the first letter of self.type is a vowel.
I've tried searching, but all the responses are about regular strings.
How do I check if self.type begins with a vowel?
Is there a better way to do this?
...ANSWER
Answered 2020-Jun-05 at 16:14type
is a string, it doesn't matter it's a class attribute. Treat it like a regular string. Even attributes are variables which have basic types (e.g integer, float, string, list) or a bit more complex type (like another class).
As for your question, the following lines check if first letter is a vowel:
QUESTION
I have an application that should use a shared connection pool for all requests. I observe that at seemingly-random times, requests fail with the error type "Closed". I have isolated this behavior into the following example:
...ANSWER
Answered 2020-Apr-15 at 07:26Turns out, the problem is completely predicated on the [tokio::test]
annotation starting up a distinct runtime whenever a test is executed. The lazy static is initialized with one of these runtimes, and as soon as that runtime shuts down, the pool is destroyed. The other tests (with different runtimes) can use the value as long as the spawning test still runs, but are met with an invalid state once it has shut down.
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