typed_sql/query/select/
mod.rs

1use std::fmt::Write;
2
3use super::filter::Filter;
4use super::Predicate;
5use crate::sql::{CheckedSql, ToSql};
6
7pub mod group;
8pub use group::{GroupBy, GroupOrder};
9
10pub mod join;
11pub use join::{Join, Joined};
12
13pub mod order;
14pub use order::{Order, OrderBy};
15
16pub mod queryable;
17pub use queryable::{Queryable, WildCard, WriteQueryable};
18
19mod selectable;
20pub use selectable::{SelectStatement, Selectable};
21
22pub trait Select: ToSql {
23    type Selectable: Selectable;
24    type Queryable: WriteQueryable;
25}
26
27impl<S, Q> Select for SelectStatement<S, Q>
28where
29    S: Selectable,
30    Q: WriteQueryable,
31{
32    type Selectable = S;
33    type Queryable = Q;
34}
35
36impl<S, Q, P> Select for Filter<SelectStatement<S, Q>, P>
37where
38    S: Selectable,
39    Q: WriteQueryable,
40    P: Predicate,
41{
42    type Selectable = S;
43    type Queryable = Q;
44}
45
46#[derive(Debug, Clone, Copy)]
47pub struct Limit<Q> {
48    queryable: Q,
49    limit: usize,
50}
51
52impl<Q> Limit<Q> {
53    #[inline(always)]
54    pub(crate) const fn new(queryable: Q, limit: usize) -> Self {
55        Self { queryable, limit }
56    }
57}
58
59impl<Q: Select> Select for Limit<Q> {
60    type Selectable = Q::Selectable;
61    type Queryable = Q::Queryable;
62}
63
64impl<Q: Select> ToSql for Limit<Q> {
65    fn write_sql_unchecked(&self, sql: &mut String) {
66        self.queryable.write_sql_unchecked(sql);
67        sql.write_fmt(format_args!(" LIMIT {}", self.limit))
68            .unwrap();
69    }
70}
71
72impl<Q: CheckedSql> CheckedSql for Limit<Q> {}
typed_sql/query/select/mod.rs

typed_sql/query/select/
mod.rs
