cartel_sqlite/
decode.rs

1use rusqlite::{Result, Row};
2
3pub trait Decode: Sized {
4    const N_COLS: usize;
5    fn decode_at(row: &Row<'_>, col_offset: usize) -> Result<Self>;
6    fn decode(row: &Row<'_>) -> Result<Self> {
7        Self::decode_at(row, 0)
8    }
9}
10
11impl Decode for i8 {
12    const N_COLS: usize = 1;
13    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
14        row.get(off)
15    }
16}
17impl Decode for i16 {
18    const N_COLS: usize = 1;
19    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
20        row.get(off)
21    }
22}
23impl Decode for i32 {
24    const N_COLS: usize = 1;
25    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
26        row.get(off)
27    }
28}
29impl Decode for i64 {
30    const N_COLS: usize = 1;
31    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
32        row.get(off)
33    }
34}
35impl Decode for isize {
36    const N_COLS: usize = 1;
37    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
38        row.get(off)
39    }
40}
41impl Decode for u8 {
42    const N_COLS: usize = 1;
43    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
44        row.get(off)
45    }
46}
47impl Decode for u16 {
48    const N_COLS: usize = 1;
49    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
50        row.get(off)
51    }
52}
53impl Decode for u32 {
54    const N_COLS: usize = 1;
55    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
56        row.get(off)
57    }
58}
59impl Decode for u64 {
60    const N_COLS: usize = 1;
61    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
62        row.get(off)
63    }
64}
65impl Decode for f32 {
66    const N_COLS: usize = 1;
67    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
68        row.get(off)
69    }
70}
71impl Decode for f64 {
72    const N_COLS: usize = 1;
73    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
74        row.get(off)
75    }
76}
77impl Decode for bool {
78    const N_COLS: usize = 1;
79    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
80        row.get(off)
81    }
82}
83impl Decode for String {
84    const N_COLS: usize = 1;
85    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
86        row.get(off)
87    }
88}
89impl Decode for Vec<u8> {
90    const N_COLS: usize = 1;
91    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
92        row.get(off)
93    }
94}
95
96impl<T: rusqlite::types::FromSql> Decode for Option<T> {
97    const N_COLS: usize = 1;
98    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
99        row.get(off)
100    }
101}
102
103impl<A: Decode, B: Decode> Decode for (A, B) {
104    const N_COLS: usize = A::N_COLS + B::N_COLS;
105    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
106        let a = A::decode_at(row, off)?;
107        let b = B::decode_at(row, off + A::N_COLS)?;
108        Ok((a, b))
109    }
110}
111impl<A: Decode, B: Decode, C: Decode> Decode for (A, B, C) {
112    const N_COLS: usize = A::N_COLS + B::N_COLS + C::N_COLS;
113    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
114        let a = A::decode_at(row, off)?;
115        let b = B::decode_at(row, off + A::N_COLS)?;
116        let c = C::decode_at(row, off + A::N_COLS + B::N_COLS)?;
117        Ok((a, b, c))
118    }
119}
120impl<A: Decode, B: Decode, C: Decode, D: Decode> Decode for (A, B, C, D) {
121    const N_COLS: usize = A::N_COLS + B::N_COLS + C::N_COLS + D::N_COLS;
122    fn decode_at(row: &Row<'_>, off: usize) -> Result<Self> {
123        let a = A::decode_at(row, off)?;
124        let b = B::decode_at(row, off + A::N_COLS)?;
125        let c = C::decode_at(row, off + A::N_COLS + B::N_COLS)?;
126        let d = D::decode_at(row, off + A::N_COLS + B::N_COLS + C::N_COLS)?;
127        Ok((a, b, c, d))
128    }
129}
cartel_sqlite/decode.rs

cartel_sqlite/
decode.rs
