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use crate::query_builder::limit_clause::{LimitClause, NoLimitClause};
use crate::query_builder::limit_offset_clause::{BoxedLimitOffsetClause, LimitOffsetClause};
use crate::query_builder::offset_clause::{NoOffsetClause, OffsetClause};
use crate::query_builder::{AstPass, IntoBoxedClause, QueryFragment};
use crate::result::QueryResult;
use crate::sqlite::Sqlite;
impl QueryFragment<Sqlite> for LimitOffsetClause<NoLimitClause, NoOffsetClause> {
fn walk_ast<'b>(&'b self, _out: AstPass<'_, 'b, Sqlite>) -> QueryResult<()> {
Ok(())
}
}
impl<L> QueryFragment<Sqlite> for LimitOffsetClause<LimitClause<L>, NoOffsetClause>
where
LimitClause<L>: QueryFragment<Sqlite>,
{
fn walk_ast<'b>(&'b self, out: AstPass<'_, 'b, Sqlite>) -> QueryResult<()> {
self.limit_clause.walk_ast(out)?;
Ok(())
}
}
impl<O> QueryFragment<Sqlite> for LimitOffsetClause<NoLimitClause, OffsetClause<O>>
where
OffsetClause<O>: QueryFragment<Sqlite>,
{
fn walk_ast<'b>(&'b self, mut out: AstPass<'_, 'b, Sqlite>) -> QueryResult<()> {
out.push_sql(" LIMIT -1 ");
self.offset_clause.walk_ast(out)?;
Ok(())
}
}
impl<L, O> QueryFragment<Sqlite> for LimitOffsetClause<LimitClause<L>, OffsetClause<O>>
where
LimitClause<L>: QueryFragment<Sqlite>,
OffsetClause<O>: QueryFragment<Sqlite>,
{
fn walk_ast<'b>(&'b self, mut out: AstPass<'_, 'b, Sqlite>) -> QueryResult<()> {
self.limit_clause.walk_ast(out.reborrow())?;
self.offset_clause.walk_ast(out.reborrow())?;
Ok(())
}
}
impl<'a> QueryFragment<Sqlite> for BoxedLimitOffsetClause<'a, Sqlite> {
fn walk_ast<'b>(&'b self, mut out: AstPass<'_, 'b, Sqlite>) -> QueryResult<()> {
match (self.limit.as_ref(), self.offset.as_ref()) {
(Some(limit), Some(offset)) => {
limit.walk_ast(out.reborrow())?;
offset.walk_ast(out.reborrow())?;
}
(Some(limit), None) => {
limit.walk_ast(out.reborrow())?;
}
(None, Some(offset)) => {
out.push_sql(" LIMIT -1 ");
offset.walk_ast(out.reborrow())?;
}
(None, None) => {}
}
Ok(())
}
}
impl<'a> IntoBoxedClause<'a, Sqlite> for LimitOffsetClause<NoLimitClause, NoOffsetClause> {
type BoxedClause = BoxedLimitOffsetClause<'a, Sqlite>;
fn into_boxed(self) -> Self::BoxedClause {
BoxedLimitOffsetClause {
limit: None,
offset: None,
}
}
}
impl<'a, L> IntoBoxedClause<'a, Sqlite> for LimitOffsetClause<LimitClause<L>, NoOffsetClause>
where
L: QueryFragment<Sqlite> + Send + 'a,
{
type BoxedClause = BoxedLimitOffsetClause<'a, Sqlite>;
fn into_boxed(self) -> Self::BoxedClause {
BoxedLimitOffsetClause {
limit: Some(Box::new(self.limit_clause)),
offset: None,
}
}
}
impl<'a, O> IntoBoxedClause<'a, Sqlite> for LimitOffsetClause<NoLimitClause, OffsetClause<O>>
where
O: QueryFragment<Sqlite> + Send + 'a,
{
type BoxedClause = BoxedLimitOffsetClause<'a, Sqlite>;
fn into_boxed(self) -> Self::BoxedClause {
BoxedLimitOffsetClause {
limit: None,
offset: Some(Box::new(self.offset_clause)),
}
}
}
impl<'a, L, O> IntoBoxedClause<'a, Sqlite> for LimitOffsetClause<LimitClause<L>, OffsetClause<O>>
where
L: QueryFragment<Sqlite> + Send + 'a,
O: QueryFragment<Sqlite> + Send + 'a,
{
type BoxedClause = BoxedLimitOffsetClause<'a, Sqlite>;
fn into_boxed(self) -> Self::BoxedClause {
BoxedLimitOffsetClause {
limit: Some(Box::new(self.limit_clause)),
offset: Some(Box::new(self.offset_clause)),
}
}
}