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use backend::Backend;
use expression::coerce::Coerce;
use expression::{AsExpression, Expression, NonAggregate};
use query_builder::*;
use result::QueryResult;
use sql_types::*;
#[allow(non_camel_case_types)]
#[derive(Debug, Copy, Clone, QueryId)]
pub struct now;
impl Expression for now {
type SqlType = Timestamp;
}
impl NonAggregate for now {}
impl<DB: Backend> QueryFragment<DB> for now {
fn walk_ast(&self, mut out: AstPass<DB>) -> QueryResult<()> {
out.push_sql("CURRENT_TIMESTAMP");
Ok(())
}
}
impl_selectable_expression!(now);
operator_allowed!(now, Add, add);
operator_allowed!(now, Sub, sub);
sql_function! {
fn date(expr: Timestamp) -> Date;
}
impl AsExpression<Nullable<Timestamp>> for now {
type Expression = Coerce<now, Nullable<Timestamp>>;
fn as_expression(self) -> Self::Expression {
Coerce::new(self)
}
}
#[cfg(feature = "postgres")]
impl AsExpression<Timestamptz> for now {
type Expression = Coerce<now, Timestamptz>;
fn as_expression(self) -> Self::Expression {
Coerce::new(self)
}
}
#[cfg(feature = "postgres")]
impl AsExpression<Nullable<Timestamptz>> for now {
type Expression = Coerce<now, Nullable<Timestamptz>>;
fn as_expression(self) -> Self::Expression {
Coerce::new(self)
}
}