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use backend::Backend;
use expression::{
AppearsOnTable, AsExpressionList, Expression, NonAggregate, SelectableExpression,
};
use query_builder::{AstPass, QueryFragment};
use sql_types;
use std::marker::PhantomData;
#[derive(Debug, Clone, Copy, QueryId)]
pub struct ArrayLiteral<T, ST> {
elements: T,
_marker: PhantomData<ST>,
}
pub fn array<ST, T>(elements: T) -> ArrayLiteral<T::Expression, ST>
where
T: AsExpressionList<ST>,
{
ArrayLiteral {
elements: elements.as_expression_list(),
_marker: PhantomData,
}
}
impl<T, ST> Expression for ArrayLiteral<T, ST>
where
T: Expression,
{
type SqlType = sql_types::Array<ST>;
}
impl<T, ST, DB> QueryFragment<DB> for ArrayLiteral<T, ST>
where
DB: Backend,
for<'a> (&'a T): QueryFragment<DB>,
{
fn walk_ast(&self, mut out: AstPass<DB>) -> ::result::QueryResult<()> {
out.push_sql("ARRAY[");
QueryFragment::walk_ast(&&self.elements, out.reborrow())?;
out.push_sql("]");
Ok(())
}
}
impl<T, ST, QS> SelectableExpression<QS> for ArrayLiteral<T, ST>
where
T: SelectableExpression<QS>,
ArrayLiteral<T, ST>: AppearsOnTable<QS>,
{
}
impl<T, ST, QS> AppearsOnTable<QS> for ArrayLiteral<T, ST>
where
T: AppearsOnTable<QS>,
ArrayLiteral<T, ST>: Expression,
{
}
impl<T, ST> NonAggregate for ArrayLiteral<T, ST>
where
T: NonAggregate,
ArrayLiteral<T, ST>: Expression,
{
}