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use expression::SqlLiteral;
use pg::Pg;
use query_builder::*;
use query_source::Column;
use result::QueryResult;
pub fn on_constraint(constraint_name: &str) -> OnConstraint {
OnConstraint {
constraint_name: constraint_name,
}
}
#[doc(hidden)]
#[derive(Debug, Clone, Copy)]
pub struct OnConstraint<'a> {
constraint_name: &'a str,
}
pub trait OnConflictTarget<Table>: QueryFragment<Pg> {}
#[doc(hidden)]
#[derive(Debug, Clone, Copy)]
pub struct NoConflictTarget;
impl QueryFragment<Pg> for NoConflictTarget {
fn walk_ast(&self, _: AstPass<Pg>) -> QueryResult<()> {
Ok(())
}
}
impl<Table> OnConflictTarget<Table> for NoConflictTarget {}
#[doc(hidden)]
#[derive(Debug, Clone, Copy)]
pub struct ConflictTarget<T>(pub T);
impl<T: Column> QueryFragment<Pg> for ConflictTarget<T> {
fn walk_ast(&self, mut out: AstPass<Pg>) -> QueryResult<()> {
out.push_sql(" (");
out.push_identifier(T::NAME)?;
out.push_sql(")");
Ok(())
}
}
impl<T: Column> OnConflictTarget<T::Table> for ConflictTarget<T> {}
impl<ST> QueryFragment<Pg> for ConflictTarget<SqlLiteral<ST>>
where
SqlLiteral<ST>: QueryFragment<Pg>,
{
fn walk_ast(&self, mut out: AstPass<Pg>) -> QueryResult<()> {
out.push_sql(" ");
self.0.walk_ast(out.reborrow())?;
Ok(())
}
}
impl<Tab, ST> OnConflictTarget<Tab> for ConflictTarget<SqlLiteral<ST>> where
ConflictTarget<SqlLiteral<ST>>: QueryFragment<Pg>
{
}
impl<'a> QueryFragment<Pg> for ConflictTarget<OnConstraint<'a>> {
fn walk_ast(&self, mut out: AstPass<Pg>) -> QueryResult<()> {
out.push_sql(" ON CONSTRAINT ");
out.push_identifier(self.0.constraint_name)?;
Ok(())
}
}
impl<'a, Table> OnConflictTarget<Table> for ConflictTarget<OnConstraint<'a>> {}
macro_rules! on_conflict_tuples {
($($col:ident),+) => {
impl<T, $($col),+> QueryFragment<Pg> for ConflictTarget<(T, $($col),+)> where
T: Column,
$($col: Column<Table=T::Table>,)+
{
fn walk_ast(&self, mut out: AstPass<Pg>) -> QueryResult<()> {
out.push_sql(" (");
out.push_identifier(T::NAME)?;
$(
out.push_sql(", ");
out.push_identifier($col::NAME)?;
)+
out.push_sql(")");
Ok(())
}
}
impl<T, $($col),+> OnConflictTarget<T::Table> for ConflictTarget<(T, $($col),+)> where
T: Column,
$($col: Column<Table=T::Table>,)+
{
}
}
}
on_conflict_tuples!(U);
on_conflict_tuples!(U, V);
on_conflict_tuples!(U, V, W);
on_conflict_tuples!(U, V, W, X);
on_conflict_tuples!(U, V, W, X, Y);
on_conflict_tuples!(U, V, W, X, Y, Z);