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use expression::Expression;
use expression::aliased::Aliased;
use query_builder::*;
use query_source::QuerySource;
use result::QueryResult;
pub trait WithDsl<'a, Expr> {
type Output: AsQuery;
fn with(self, expr: Aliased<'a, Expr>) -> Self::Output;
}
impl<'a, T, Expr> WithDsl<'a, Expr> for T where
T: QuerySource + AsQuery,
T::Query: WithDsl<'a, Expr>
{
type Output = <T::Query as WithDsl<'a, Expr>>::Output;
fn with(self, expr: Aliased<'a, Expr>) -> Self::Output {
self.as_query().with(expr)
}
}
#[doc(hidden)]
#[derive(Debug, Copy, Clone)]
pub struct WithQuerySource<'a, Left, Right> {
left: Left,
right: Aliased<'a, Right>,
}
impl<'a, Left, Right> WithQuerySource<'a, Left, Right> {
pub fn new(left: Left, right: Aliased<'a, Right>) -> Self {
WithQuerySource {
left: left,
right: right,
}
}
}
impl<'a, Left, Right> QuerySource for WithQuerySource<'a, Left, Right> where
Left: QuerySource,
Aliased<'a, Right>: QuerySource + Expression,
{
type FromClause = PgOnly<(Left::FromClause, <Aliased<'a, Right> as QuerySource>::FromClause)>;
fn from_clause(&self) -> Self::FromClause {
PgOnly((self.left.from_clause(), self.right.from_clause()))
}
}
impl<'a, Left, Right> QueryId for WithQuerySource<'a, Left, Right> {
type QueryId = ();
fn has_static_query_id() -> bool {
false
}
}
#[doc(hidden)]
#[derive(Debug, Copy, Clone)]
pub struct PgOnly<T>(T);
#[cfg(feature = "postgres")]
use pg::{Pg, PgQueryBuilder};
#[cfg(feature = "postgres")]
impl<T: QueryFragment<Pg>> QueryFragment<Pg> for PgOnly<T> {
fn to_sql(&self, out: &mut PgQueryBuilder) -> BuildQueryResult {
self.0.to_sql(out)
}
fn collect_binds(&self, out: &mut <Pg as Backend>::BindCollector) -> QueryResult<()> {
self.0.collect_binds(out)
}
fn is_safe_to_cache_prepared(&self) -> bool {
self.0.is_safe_to_cache_prepared()
}
}
use backend::*;
impl<T: QueryFragment<Debug>> QueryFragment<Debug> for PgOnly<T> {
fn to_sql(&self, out: &mut <Debug as Backend>::QueryBuilder) -> BuildQueryResult {
self.0.to_sql(out)
}
fn collect_binds(&self, out: &mut <Debug as Backend>::BindCollector) -> QueryResult<()> {
self.0.collect_binds(out)
}
fn is_safe_to_cache_prepared(&self) -> bool {
self.0.is_safe_to_cache_prepared()
}
}