drizzle-core 0.1.5

A type-safe SQL query builder for Rust
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135

//! Arithmetic operations using std::ops traits.
//!
//! This module implements `Add`, `Sub`, `Mul`, `Div`, `Rem` for `SQLExpr`,
//! enabling natural Rust syntax for SQL arithmetic.

use core::ops::{Add, Div, Mul, Neg, Rem, Sub};

use crate::sql::{SQL, Token};
use crate::traits::SQLParam;
use crate::types::{ArithmeticOutput, Numeric};

use super::{AggregateKind, Expr, NullOr, Nullability, SQLExpr, Scalar};

// =============================================================================
// Addition
// =============================================================================

impl<'a, V, T, N, A, Rhs> Add<Rhs> for SQLExpr<'a, V, T, N, A>
where
    V: SQLParam + 'a,
    T: ArithmeticOutput<Rhs::SQLType>,
    N: Nullability + NullOr<Rhs::Nullable>,
    A: AggregateKind,
    Rhs: Expr<'a, V>,
    Rhs::SQLType: Numeric,
    Rhs::Nullable: Nullability,
{
    type Output = SQLExpr<'a, V, T::Output, <N as NullOr<Rhs::Nullable>>::Output, Scalar>;

    fn add(self, rhs: Rhs) -> Self::Output {
        SQLExpr::new(self.into_sql().push(Token::PLUS).append(rhs.into_sql()))
    }
}

// =============================================================================
// Subtraction
// =============================================================================

impl<'a, V, T, N, A, Rhs> Sub<Rhs> for SQLExpr<'a, V, T, N, A>
where
    V: SQLParam + 'a,
    T: ArithmeticOutput<Rhs::SQLType>,
    N: Nullability + NullOr<Rhs::Nullable>,
    A: AggregateKind,
    Rhs: Expr<'a, V>,
    Rhs::SQLType: Numeric,
    Rhs::Nullable: Nullability,
{
    type Output = SQLExpr<'a, V, T::Output, <N as NullOr<Rhs::Nullable>>::Output, Scalar>;

    fn sub(self, rhs: Rhs) -> Self::Output {
        SQLExpr::new(self.into_sql().push(Token::MINUS).append(rhs.into_sql()))
    }
}

// =============================================================================
// Multiplication
// =============================================================================

impl<'a, V, T, N, A, Rhs> Mul<Rhs> for SQLExpr<'a, V, T, N, A>
where
    V: SQLParam + 'a,
    T: ArithmeticOutput<Rhs::SQLType>,
    N: Nullability + NullOr<Rhs::Nullable>,
    A: AggregateKind,
    Rhs: Expr<'a, V>,
    Rhs::SQLType: Numeric,
    Rhs::Nullable: Nullability,
{
    type Output = SQLExpr<'a, V, T::Output, <N as NullOr<Rhs::Nullable>>::Output, Scalar>;

    fn mul(self, rhs: Rhs) -> Self::Output {
        SQLExpr::new(self.into_sql().push(Token::STAR).append(rhs.into_sql()))
    }
}

// =============================================================================
// Division
// =============================================================================

impl<'a, V, T, N, A, Rhs> Div<Rhs> for SQLExpr<'a, V, T, N, A>
where
    V: SQLParam + 'a,
    T: ArithmeticOutput<Rhs::SQLType>,
    N: Nullability + NullOr<Rhs::Nullable>,
    A: AggregateKind,
    Rhs: Expr<'a, V>,
    Rhs::SQLType: Numeric,
    Rhs::Nullable: Nullability,
{
    type Output = SQLExpr<'a, V, T::Output, <N as NullOr<Rhs::Nullable>>::Output, Scalar>;

    fn div(self, rhs: Rhs) -> Self::Output {
        SQLExpr::new(self.into_sql().push(Token::SLASH).append(rhs.into_sql()))
    }
}

// =============================================================================
// Remainder (Modulo)
// =============================================================================

impl<'a, V, T, N, A, Rhs> Rem<Rhs> for SQLExpr<'a, V, T, N, A>
where
    V: SQLParam + 'a,
    T: ArithmeticOutput<Rhs::SQLType>,
    N: Nullability + NullOr<Rhs::Nullable>,
    A: AggregateKind,
    Rhs: Expr<'a, V>,
    Rhs::SQLType: Numeric,
    Rhs::Nullable: Nullability,
{
    type Output = SQLExpr<'a, V, T::Output, <N as NullOr<Rhs::Nullable>>::Output, Scalar>;

    fn rem(self, rhs: Rhs) -> Self::Output {
        SQLExpr::new(self.into_sql().push(Token::REM).append(rhs.into_sql()))
    }
}

// =============================================================================
// Negation
// =============================================================================

impl<'a, V, T, N, A> Neg for SQLExpr<'a, V, T, N, A>
where
    V: SQLParam + 'a,
    T: Numeric,
    N: Nullability,
    A: AggregateKind,
{
    type Output = SQLExpr<'a, V, T, N, Scalar>;

    fn neg(self) -> Self::Output {
        SQLExpr::new(SQL::from(Token::MINUS).append(self.into_sql().parens()))
    }
}