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55 lines
2.2 KiB
Markdown
55 lines
2.2 KiB
Markdown
---
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title: Databases
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menu: docs_patterns
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weight: 1010
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---
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# Diesel
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{{% alert %}}
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NOTE: The `actix-web` 1.0 version of this section is still
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[being updated](https://github.com/cldershem/actix-website/tree/update1.0-db). Checkout
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this [example](https://github.com/actix/examples/tree/master/async_db) until then.
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{{% /alert %}}
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At the moment, Diesel 1.0 does not support asynchronous operations,
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but it's possible to use the `actix` synchronous actor system as a database interface api.
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Technically, sync actors are worker style actors. Multiple sync actors
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can be run in parallel and process messages from same queue. Sync actors work in mpsc mode.
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Let's create a simple database api that can insert a new user row into a SQLite table.
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We must define a sync actor and a connection that this actor will use. The same approach
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can be used for other databases.
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{{< include-example example="og_databases" file="main.rs" section="actor" >}}
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This is the definition of our actor. Now, we must define the *create user* message and response.
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{{< include-example example="og_databases" file="main.rs" section="message" >}}
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We can send a `CreateUser` message to the `DbExecutor` actor, and as a result, we will receive a
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`User` model instance. Next, we must define the handler implementation for this message.
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{{< include-example example="og_databases" file="main.rs" section="handler" >}}
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That's it! Now, we can use the *DbExecutor* actor from any http handler or middleware.
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All we need is to start *DbExecutor* actors and store the address in a state where http handler
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can access it.
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{{< include-example example="og_databases" file="main.rs" section="main" >}}
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We will use the address in a request handler. The handle returns a future object;
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thus, we receive the message response asynchronously.
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`Route::a()` must be used for async handler registration.
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{{< include-example example="og_databases" file="main.rs" section="index" >}}
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> A full example is available in the [examples directory][examples].
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> More information on sync actors can be found in the
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> [actix documentation][actixdocs].
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[examples]: https://github.com/actix/examples/tree/master/diesel/
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[actixdocs]: https://docs.rs/actix/0.7.0/actix/sync/index.html
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