r2d2 | A generic connection pool for Rust | Database library

by sfackler Rust Version: v0.8.10 License: Apache-2.0

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | r2d2 Summary

r2d2 is a Rust library typically used in Database applications. r2d2 has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

A generic connection pool for Rust. 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. r2d2 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.

Support

Quality

Security

License

Reuse

Support

r2d2 has a medium active ecosystem.

It has 1287 star(s) with 74 fork(s). There are 18 watchers for this library.

It had no major release in the last 12 months.

There are 15 open issues and 69 have been closed. On average issues are closed in 65 days. There are 5 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of r2d2 is v0.8.10

Quality

r2d2 has 0 bugs and 0 code smells.

Security

r2d2 has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

r2d2 code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

r2d2 is licensed under the Apache-2.0 License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

r2d2 releases are available to install and integrate.

Installation instructions are not available. Examples and code snippets are available.

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r2d2 Key Features

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r2d2 Examples and Code Snippets

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Community Discussions

Trending Discussions on r2d2

diesel: inner_join forward query

Aggregate total and unique counts based on value type and unique visitorId - MongoDB

MongoDB query to find text in third level array of objects

Is there a way to match the _id of one mongodb array to the corresponding clientId from another array?

One of my assignment question - Just looking to keep it simple

web::block() fails with "`NonNull` cannot be shared between threads safely"

How to use a C-like enum with diesel

Open MongoDB to internal IPs

Trait diesel::Expression not implemented for NaiveDate, but it is for NaiveDateTime

How to project PyBullet simulation coordinates to rendered Frame pixel coordinates using OpenCV?

QUESTION

diesel: inner_join forward query

Asked 2022-Apr-10 at 08:03

I am learning to use inner_join for forward query

...

ANSWER

Answered 2022-Apr-10 at 08:03

your real problem is with serde crate

if you have data type like this (String, i32, ...) serde will create array in output see following code

Source https://stackoverflow.com/questions/71813474

QUESTION

Aggregate total and unique counts based on value type and unique visitorId - MongoDB

Asked 2022-Feb-11 at 12:49

Similar to another question I had (Here). But now I'm trying to count unique and total events on daily basis for each event type, based on the following data shape:

...

ANSWER

Answered 2022-Feb-11 at 12:49

mongo playground

Source https://stackoverflow.com/questions/71080000

QUESTION

MongoDB query to find text in third level array of objects

Asked 2022-Feb-10 at 19:56

I have a Mongo collection that contains data on saved searches in a Vue/Laravel app, and it contains records like the following:

...

ANSWER

Answered 2022-Feb-10 at 00:58

To find all documents containing at least one value string with (.) , try:

Source https://stackoverflow.com/questions/71058047

QUESTION

Is there a way to match the _id of one mongodb array to the corresponding clientId from another array?

Asked 2022-Feb-05 at 04:39

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 04:39

You can write a simple function to retrieve the full name.

Source https://stackoverflow.com/questions/70995297

QUESTION

One of my assignment question - Just looking to keep it simple

Asked 2022-Feb-01 at 15:05

The program will take one argument, corresponding to one of the relations' keys. The program will print out the statement:

John, I am your x

Where x = the relationship.

For example, if the argument is "Lisa", it should print "John, I am your sister"

If the key is "Smith" you should instead print "No, I am your father"

Here is my code:

...

ANSWER

Answered 2022-Feb-01 at 15:01

you did not import sys module, and you also need to specify the argument for the function Relation.

Source https://stackoverflow.com/questions/70942641

QUESTION

web::block() fails with "`NonNull` cannot be shared between threads safely"

Asked 2022-Jan-23 at 20:12

#[macro_use]
extern crate diesel;

use diesel::result::Error;

use actix_web::web;
use diesel::{PgConnection, QueryDsl, RunQueryDsl};
use r2d2::{Pool, PooledConnection};
use r2d2_diesel::ConnectionManager;
use schema::tests::dsl::*;

pub mod schema;

pub type MyDBConnectionManager = ConnectionManager;
pub type MyPool = Pool;
pub type MyDBConnection = PooledConnection;

struct S { }

impl S {
    async fn download_and_store_object(pool: web::Data) -> Result<(), Error>
    {
        let conn_ = pool.get().expect("couldn't get db connection from pool");
        let conn = &conn_;

        let v_data_size: Option = web::block(move || -> Result<_, Error> {
            Ok(tests.select(b).get_result::>(&**conn)?)
        }).await.unwrap();

        Ok(())

    }
}

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    Ok(())
}

...

ANSWER

Answered 2022-Jan-23 at 20:12

As said in the comments, Conn can not be shared between threads, so in this case you would need to move the Pool handle, and get a connection from within the clusure itself:

Source https://stackoverflow.com/questions/70825457

QUESTION

How to use a C-like enum with diesel

Asked 2022-Jan-05 at 08:55

I have a users table that I'm trying to add a role field to with Diesel:

...

ANSWER

Answered 2022-Jan-05 at 08:55

You need to derive FromSqlRow as well. It will generate the necessary FromSqlRow and Queryable impl for your type.

Source https://stackoverflow.com/questions/70589365

QUESTION

Open MongoDB to internal IPs

Asked 2022-Jan-02 at 13:54

I have MongoDB running on a Raspberry Pi at my house, and I'm trying to edit the config file so that other computers at my house can connect to it. Here's some numbers:

Device IP Raspberry Pi 192.168.1.5 Laptop 192.168.1.7

When I edit /etc/mongod.conf to look like this, I can connect from my laptop:

...

ANSWER

Answered 2022-Jan-02 at 13:54

User R2D2 in the comments was correct; I needed to use the IP of the host machine, not the IP of the connecting machine. This makes sense, now that I know. Below is the working config - notice the IP listed is the IP of the Raspberry Pi, which is the same IP my dev machines will be pointing to in order to connect.

Source https://stackoverflow.com/questions/70550412

QUESTION

Trait diesel::Expression not implemented for NaiveDate, but it is for NaiveDateTime

Asked 2021-Dec-21 at 08:34

I am trying to use chrono::NaiveDate as a database model field. Here is the model:

...

ANSWER

Answered 2021-Dec-21 at 08:34

First of all your question is missing important information. This includes the corresponding table! call from your schema.

Now the guessing what could possibly cause this based on the information you provided:

The error message indicates that you try to insert a NaiveDate into a Timestamp field. That's just something that is not supported as a timestamp expects a data and a time value, while a NaiveDate only provides a date value. You can see a list of out of the box supported type mappings for diesel in the documentation of each SQL type. For example for Timestamp here

Source https://stackoverflow.com/questions/70430356

QUESTION

How to project PyBullet simulation coordinates to rendered Frame pixel coordinates using OpenCV?

Asked 2021-Nov-15 at 22:50

How can I convert an objects position in PyBullet to pixel coordinates & draw a line onto the frame using PyBullet & OpenCV?

We would like to do this because PyBullet native addUserDebugLine() function is not available in DIRECT mode.

...

ANSWER

Answered 2021-Nov-15 at 22:50

After a lot of fiddling, I came to a solution. Playing with it for a while, I came to a point where it looked almost OK except for a rotation of the axes given by the yaw angle. So, I did a second call to computeViewMatrixFromYawPitchRoll but with the opposite yaw in order to compute the transformation for the axes. Unfortunately, I'm not sure about why this works... But it works! Note: base_pos, _cam_dist, _cam_yaw and _cam_pitch have been displaced into render() Note also: the up direction has been reversed too (don't ask why... :-) ) A pretty messy explanation, I must admit...

Source https://stackoverflow.com/questions/69803623

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install r2d2

You can download it from GitHub.
Rust is installed and managed by the rustup tool. Rust has a 6-week rapid release process and supports a great number of platforms, so there are many builds of Rust available at any time. Please refer rust-lang.org for more information.

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