diesel/query_builder/nodes/
mod.rs

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1use crate::backend::DieselReserveSpecialization;
2use crate::query_builder::*;
3use std::marker::PhantomData;
4
5#[doc(hidden)] // used by the table macro
6pub trait StaticQueryFragment {
7    type Component: 'static;
8    const STATIC_COMPONENT: &'static Self::Component;
9}
10
11#[derive(Debug, Copy, Clone)]
12#[doc(hidden)] // used by the table macro
13pub struct StaticQueryFragmentInstance<T>(PhantomData<T>);
14
15impl<T> StaticQueryFragmentInstance<T> {
16    #[doc(hidden)] // used by the table macro
17    pub const fn new() -> Self {
18        Self(PhantomData)
19    }
20}
21
22impl<T, DB> QueryFragment<DB> for StaticQueryFragmentInstance<T>
23where
24    DB: Backend + DieselReserveSpecialization,
25    T: StaticQueryFragment,
26    T::Component: QueryFragment<DB>,
27{
28    fn walk_ast<'b>(&'b self, pass: AstPass<'_, 'b, DB>) -> QueryResult<()> {
29        T::STATIC_COMPONENT.walk_ast(pass)
30    }
31}
32
33#[derive(Debug, Copy, Clone)]
34#[doc(hidden)] // used by the table macro
35pub struct Identifier<'a>(pub &'a str);
36
37impl<DB: Backend> QueryFragment<DB> for Identifier<'_> {
38    fn walk_ast<'b>(&'b self, mut out: AstPass<'_, 'b, DB>) -> QueryResult<()> {
39        out.push_identifier(self.0)
40    }
41}
42
43pub trait MiddleFragment<DB: Backend> {
44    fn push_sql(&self, pass: AstPass<'_, '_, DB>);
45}
46
47impl<DB: Backend> MiddleFragment<DB> for &str {
48    fn push_sql(&self, mut pass: AstPass<'_, '_, DB>) {
49        pass.push_sql(self);
50    }
51}
52
53#[derive(Debug, Copy, Clone)]
54#[doc(hidden)] // used by the table macro
55pub struct InfixNode<T, U, M> {
56    lhs: T,
57    rhs: U,
58    middle: M,
59}
60
61impl<T, U, M> InfixNode<T, U, M> {
62    #[doc(hidden)] // used by the table macro
63    pub const fn new(lhs: T, rhs: U, middle: M) -> Self {
64        InfixNode { lhs, rhs, middle }
65    }
66}
67
68impl<T, U, DB, M> QueryFragment<DB> for InfixNode<T, U, M>
69where
70    DB: Backend + DieselReserveSpecialization,
71    T: QueryFragment<DB>,
72    U: QueryFragment<DB>,
73    M: MiddleFragment<DB>,
74{
75    fn walk_ast<'b>(&'b self, mut out: AstPass<'_, 'b, DB>) -> QueryResult<()> {
76        self.lhs.walk_ast(out.reborrow())?;
77        self.middle.push_sql(out.reborrow());
78        self.rhs.walk_ast(out.reborrow())?;
79        Ok(())
80    }
81}
diesel/query_builder/nodes/mod.rs

diesel/query_builder/nodes/
mod.rs
