sqlx-exasol-impl 0.9.2

Driver implementation for sqlx-exasol. Not meant to be used directly.
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
136
137
138
139
140
141
142
143
144
145
146
147
148
149

use std::ops::Range;

use serde::Deserialize;
use serde_json::Value;
use sqlx_core::{
    decode::Decode,
    encode::{Encode, IsNull},
    error::BoxDynError,
    types::Type,
};

use crate::{
    arguments::ExaBuffer,
    database::Exasol,
    type_info::{Decimal, ExaDataType, ExaTypeInfo},
    types::ExaHasArrayType,
    value::ExaValueRef,
};

/// Numbers within this range must be serialized/deserialized as integers.
/// The ones above/under these thresholds are treated as strings.
const NUMERIC_I64_RANGE: Range<i64> = -999_999_999_999_999_999..1_000_000_000_000_000_000;

impl Type<Exasol> for i8 {
    fn type_info() -> ExaTypeInfo {
        ExaDataType::Decimal(Decimal {
            precision: Some(Decimal::MAX_8BIT_PRECISION),
            scale: 0,
        })
        .into()
    }
}

impl Type<Exasol> for i16 {
    fn type_info() -> ExaTypeInfo {
        ExaDataType::Decimal(Decimal {
            precision: Some(Decimal::MAX_16BIT_PRECISION),
            scale: 0,
        })
        .into()
    }
}

impl Type<Exasol> for i32 {
    fn type_info() -> ExaTypeInfo {
        ExaDataType::Decimal(Decimal {
            precision: Some(Decimal::MAX_32BIT_PRECISION),
            scale: 0,
        })
        .into()
    }
}

impl Type<Exasol> for i64 {
    fn type_info() -> ExaTypeInfo {
        ExaDataType::Decimal(Decimal {
            precision: Some(Decimal::MAX_64BIT_PRECISION),
            scale: 0,
        })
        .into()
    }
}

impl ExaHasArrayType for i8 {}
impl ExaHasArrayType for i16 {}
impl ExaHasArrayType for i32 {}
impl ExaHasArrayType for i64 {}

impl Encode<'_, Exasol> for i8 {
    fn encode_by_ref(&self, buf: &mut ExaBuffer) -> Result<IsNull, BoxDynError> {
        buf.append(self)?;
        Ok(IsNull::No)
    }

    fn size_hint(&self) -> usize {
        // sign + max num digits
        1 + Decimal::MAX_8BIT_PRECISION as usize
    }
}

impl Encode<'_, Exasol> for i16 {
    fn encode_by_ref(&self, buf: &mut ExaBuffer) -> Result<IsNull, BoxDynError> {
        buf.append(self)?;
        Ok(IsNull::No)
    }

    fn size_hint(&self) -> usize {
        // sign + max num digits
        1 + Decimal::MAX_16BIT_PRECISION as usize
    }
}

impl Encode<'_, Exasol> for i32 {
    fn encode_by_ref(&self, buf: &mut ExaBuffer) -> Result<IsNull, BoxDynError> {
        buf.append(self)?;
        Ok(IsNull::No)
    }

    fn size_hint(&self) -> usize {
        // sign + max num digits
        1 + Decimal::MAX_32BIT_PRECISION as usize
    }
}

impl Encode<'_, Exasol> for i64 {
    fn encode_by_ref(&self, buf: &mut ExaBuffer) -> Result<IsNull, BoxDynError> {
        if NUMERIC_I64_RANGE.contains(self) {
            buf.append(self)?;
        } else {
            // Large numbers get serialized as strings
            buf.append(format_args!("{self}"))?;
        }

        Ok(IsNull::No)
    }

    fn size_hint(&self) -> usize {
        // 1 quote + 1 sign + max num digits + 1 quote
        2 + Decimal::MAX_64BIT_PRECISION as usize + 1
    }
}

impl Decode<'_, Exasol> for i8 {
    fn decode(value: ExaValueRef<'_>) -> Result<Self, BoxDynError> {
        <Self as Deserialize>::deserialize(value.value).map_err(From::from)
    }
}

impl Decode<'_, Exasol> for i16 {
    fn decode(value: ExaValueRef<'_>) -> Result<Self, BoxDynError> {
        <Self as Deserialize>::deserialize(value.value).map_err(From::from)
    }
}

impl Decode<'_, Exasol> for i32 {
    fn decode(value: ExaValueRef<'_>) -> Result<Self, BoxDynError> {
        <Self as Deserialize>::deserialize(value.value).map_err(From::from)
    }
}

impl Decode<'_, Exasol> for i64 {
    fn decode(value: ExaValueRef<'_>) -> Result<Self, BoxDynError> {
        match value.value {
            Value::Number(n) => <Self as Deserialize>::deserialize(n).map_err(From::from),
            Value::String(s) => serde_json::from_str(s).map_err(From::from),
            v => Err(format!("invalid i64 value: {v}").into()),
        }
    }
}