Trait sqlx_core::connection::Connection

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pub trait Connection: Send {
    type Database: Database;
    type Options: ConnectOptions<Connection = Self>;

    // Required methods
    fn close(self) -> BoxFuture<'static, Result<(), Error>>;
    fn ping(&mut self) -> BoxFuture<'_, Result<(), Error>>;
    fn begin(
        &mut self
    ) -> BoxFuture<'_, Result<Transaction<'_, Self::Database>, Error>>
       where Self: Sized;

    // Provided methods
    fn transaction<'a, F, R, E>(
        &'a mut self,
        callback: F
    ) -> BoxFuture<'a, Result<R, E>>
       where for<'c> F: FnOnce(&'c mut Transaction<'_, Self::Database>) -> BoxFuture<'c, Result<R, E>> + 'a + Send + Sync,
             Self: Sized,
             R: Send,
             E: From<Error> + Send { ... }
    fn cached_statements_size(&self) -> usize
       where Self::Database: HasStatementCache { ... }
    fn clear_cached_statements(&mut self) -> BoxFuture<'_, Result<(), Error>>
       where Self::Database: HasStatementCache { ... }
    fn connect(url: &str) -> BoxFuture<'static, Result<Self, Error>>
       where Self: Sized { ... }
    fn connect_with(
        options: &Self::Options
    ) -> BoxFuture<'_, Result<Self, Error>>
       where Self: Sized { ... }
}
Expand description

Represents a single database connection.

Required Associated Types§

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type Database: Database

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type Options: ConnectOptions<Connection = Self>

Required Methods§

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fn close(self) -> BoxFuture<'static, Result<(), Error>>

Explicitly close this database connection.

This method is not required for safe and consistent operation. However, it is recommended to call it instead of letting a connection drop as the database backend will be faster at cleaning up resources.

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fn ping(&mut self) -> BoxFuture<'_, Result<(), Error>>

Checks if a connection to the database is still valid.

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fn begin( &mut self ) -> BoxFuture<'_, Result<Transaction<'_, Self::Database>, Error>>
where Self: Sized,

Begin a new transaction or establish a savepoint within the active transaction.

Returns a Transaction for controlling and tracking the new transaction.

Provided Methods§

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fn transaction<'a, F, R, E>( &'a mut self, callback: F ) -> BoxFuture<'a, Result<R, E>>
where for<'c> F: FnOnce(&'c mut Transaction<'_, Self::Database>) -> BoxFuture<'c, Result<R, E>> + 'a + Send + Sync, Self: Sized, R: Send, E: From<Error> + Send,

Execute the function inside a transaction.

If the function returns an error, the transaction will be rolled back. If it does not return an error, the transaction will be committed.

Example
use sqlx_core::connection::Connection;
use sqlx_core::error::Error;
use sqlx_core::executor::Executor;
use sqlx_core::postgres::{PgConnection, PgRow};
use sqlx_core::query::query;

conn.transaction(|conn|Box::pin(async move {
    query("select * from ..").fetch_all(conn).await
})).await
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fn cached_statements_size(&self) -> usize
where Self::Database: HasStatementCache,

The number of statements currently cached in the connection.

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fn clear_cached_statements(&mut self) -> BoxFuture<'_, Result<(), Error>>
where Self::Database: HasStatementCache,

Removes all statements from the cache, closing them on the server if needed.

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fn connect(url: &str) -> BoxFuture<'static, Result<Self, Error>>
where Self: Sized,

Establish a new database connection.

A value of Options is parsed from the provided connection string. This parsing is database-specific.

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fn connect_with(options: &Self::Options) -> BoxFuture<'_, Result<Self, Error>>
where Self: Sized,

Establish a new database connection with the provided options.

Implementors§