mirror of
https://github.com/actix/actix-website
synced 2024-11-27 18:12:57 +01:00
49 lines
1.9 KiB
Markdown
49 lines
1.9 KiB
Markdown
---
|
|
title: Databases
|
|
menu: docs_patterns
|
|
weight: 1010
|
|
---
|
|
|
|
# Diesel
|
|
|
|
At the moment, Diesel 1.0 does not support asynchronous operations,
|
|
but it's possible to use the `actix` synchronous actor system as a database interface api.
|
|
|
|
Technically, sync actors are worker style actors. Multiple sync actors
|
|
can be run in parallel and process messages from same queue. Sync actors work in mpsc mode.
|
|
|
|
Let's create a simple database api that can insert a new user row into a SQLite table.
|
|
We must define a sync actor and a connection that this actor will use. The same approach
|
|
can be used for other databases.
|
|
|
|
{{< include-example example="og_databases" file="main.rs" section="actor" >}}
|
|
|
|
This is the definition of our actor. Now, we must define the *create user* message and response.
|
|
|
|
{{< include-example example="og_databases" file="main.rs" section="message" >}}
|
|
|
|
We can send a `CreateUser` message to the `DbExecutor` actor, and as a result, we will receive a
|
|
`User` model instance. Next, we must define the handler implementation for this message.
|
|
|
|
{{< include-example example="og_databases" file="main.rs" section="handler" >}}
|
|
|
|
That's it! Now, we can use the *DbExecutor* actor from any http handler or middleware.
|
|
All we need is to start *DbExecutor* actors and store the address in a state where http handler
|
|
can access it.
|
|
|
|
{{< include-example example="og_databases" file="main.rs" section="main" >}}
|
|
|
|
We will use the address in a request handler. The handle returns a future object;
|
|
thus, we receive the message response asynchronously.
|
|
`Route::a()` must be used for async handler registration.
|
|
|
|
{{< include-example example="og_databases" file="main.rs" section="index" >}}
|
|
|
|
> A full example is available in the [examples directory][examples].
|
|
|
|
> More information on sync actors can be found in the
|
|
> [actix documentation][actixdocs].
|
|
|
|
[examples]: https://github.com/actix/examples/tree/master/diesel/
|
|
[actixdocs]: https://docs.rs/actix/0.7.0/actix/sync/index.html
|