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use futures_core::future::BoxFuture;
use crate::cursor::HasCursor;
use crate::database::Database;
use crate::describe::Describe;
pub trait Executor
where
Self: Send,
{
type Database: Database;
fn execute<'e, 'q: 'e, 'c: 'e, E: 'e>(
&'c mut self,
query: E,
) -> BoxFuture<'e, crate::Result<u64>>
where
E: Execute<'q, Self::Database>;
fn fetch<'e, 'q, E>(&'e mut self, query: E) -> <Self::Database as HasCursor<'e, 'q>>::Cursor
where
E: Execute<'q, Self::Database>;
#[doc(hidden)]
fn describe<'e, 'q, E: 'e>(
&'e mut self,
query: E,
) -> BoxFuture<'e, crate::Result<Describe<Self::Database>>>
where
E: Execute<'q, Self::Database>;
}
pub trait RefExecutor<'e> {
type Database: Database;
fn fetch_by_ref<'q, E>(self, query: E) -> <Self::Database as HasCursor<'e, 'q>>::Cursor
where
E: Execute<'q, Self::Database>;
}
pub trait Execute<'q, DB>
where
Self: Send,
DB: Database,
{
fn into_parts(self) -> (&'q str, Option<DB::Arguments>);
#[doc(hidden)]
fn query_string(&self) -> &'q str;
}
impl<'q, DB> Execute<'q, DB> for &'q str
where
DB: Database,
{
#[inline]
fn into_parts(self) -> (&'q str, Option<DB::Arguments>) {
(self, None)
}
#[inline]
#[doc(hidden)]
fn query_string(&self) -> &'q str {
self
}
}
impl<T> Executor for &'_ mut T
where
T: Executor,
{
type Database = T::Database;
fn execute<'e, 'q: 'e, 'c: 'e, E: 'e>(
&'c mut self,
query: E,
) -> BoxFuture<'e, crate::Result<u64>>
where
E: Execute<'q, Self::Database>,
{
(**self).execute(query)
}
fn fetch<'e, 'q, E>(&'e mut self, query: E) -> <Self::Database as HasCursor<'_, 'q>>::Cursor
where
E: Execute<'q, Self::Database>,
{
(**self).fetch(query)
}
#[doc(hidden)]
fn describe<'e, 'q, E: 'e>(
&'e mut self,
query: E,
) -> BoxFuture<'e, crate::Result<Describe<Self::Database>>>
where
E: Execute<'q, Self::Database>,
{
(**self).describe(query)
}
}
impl<'c, T> RefExecutor<'c> for &'c mut T
where
T: Copy + RefExecutor<'c>,
{
type Database = T::Database;
#[inline]
fn fetch_by_ref<'q, E>(self, query: E) -> <Self::Database as HasCursor<'c, 'q>>::Cursor
where
E: Execute<'q, Self::Database>,
{
(*self).fetch_by_ref(query)
}
}