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backend.rs
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backend.rs
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use crate::any::{Any, AnyArguments, AnyQueryResult, AnyRow, AnyStatement, AnyTypeInfo};
use crate::describe::Describe;
use either::Either;
use futures_core::future::BoxFuture;
use futures_core::stream::BoxStream;
use std::fmt::Debug;
pub trait AnyConnectionBackend: std::any::Any + Debug + Send + 'static {
/// The backend name.
fn name(&self) -> &str;
/// 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.
fn close(self: Box<Self>) -> BoxFuture<'static, crate::Result<()>>;
/// Immediately close the connection without sending a graceful shutdown.
///
/// This should still at least send a TCP `FIN` frame to let the server know we're dying.
#[doc(hidden)]
fn close_hard(self: Box<Self>) -> BoxFuture<'static, crate::Result<()>>;
/// Checks if a connection to the database is still valid.
fn ping(&mut self) -> BoxFuture<'_, crate::Result<()>>;
/// Begin a new transaction or establish a savepoint within the active transaction.
///
/// Returns a [`Transaction`] for controlling and tracking the new transaction.
fn begin(&mut self) -> BoxFuture<'_, crate::Result<()>>;
fn commit(&mut self) -> BoxFuture<'_, crate::Result<()>>;
fn rollback(&mut self) -> BoxFuture<'_, crate::Result<()>>;
fn start_rollback(&mut self);
/// The number of statements currently cached in the connection.
fn cached_statements_size(&self) -> usize {
0
}
/// Removes all statements from the cache, closing them on the server if
/// needed.
fn clear_cached_statements(&mut self) -> BoxFuture<'_, crate::Result<()>> {
Box::pin(async move { Ok(()) })
}
#[doc(hidden)]
fn flush(&mut self) -> BoxFuture<'_, crate::Result<()>>;
#[doc(hidden)]
fn should_flush(&self) -> bool;
#[cfg(feature = "migrate")]
fn as_migrate(&mut self) -> crate::Result<&mut (dyn crate::migrate::Migrate + Send + 'static)> {
Err(crate::Error::Configuration(
format!(
"{} driver does not support migrations or `migrate` feature was not enabled",
self.name()
)
.into(),
))
}
fn fetch_many<'q>(
&'q mut self,
query: &'q str,
arguments: Option<AnyArguments<'q>>,
) -> BoxStream<'q, crate::Result<Either<AnyQueryResult, AnyRow>>>;
fn fetch_optional<'q>(
&'q mut self,
query: &'q str,
arguments: Option<AnyArguments<'q>>,
) -> BoxFuture<'q, crate::Result<Option<AnyRow>>>;
fn prepare_with<'c, 'q: 'c>(
&'c mut self,
sql: &'q str,
parameters: &[AnyTypeInfo],
) -> BoxFuture<'c, crate::Result<AnyStatement<'q>>>;
fn describe<'q>(&'q mut self, sql: &'q str) -> BoxFuture<'q, crate::Result<Describe<Any>>>;
}