tdsql 0.4.1

Ergonomic async Microsoft SQL Server client for Rust, with typed rows and multi-result-set support
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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208

use super::*;

fn get<T: FromSql>(v: DataValue) -> Result<T> {
    T::from_sql(&v, "col")
}

#[test]
fn reads_each_primitive() {
    assert_eq!(get::<u8>(DataValue::TinyInt(3)).unwrap(), 3u8);
    assert_eq!(get::<i16>(DataValue::SmallInt(-4)).unwrap(), -4i16);
    assert_eq!(get::<i32>(DataValue::Int(5)).unwrap(), 5i32);
    assert_eq!(get::<i64>(DataValue::BigInt(6)).unwrap(), 6i64);
    assert_eq!(get::<f64>(DataValue::Float(2.5)).unwrap(), 2.5);
    assert!(get::<bool>(DataValue::Bool(true)).unwrap());
    assert_eq!(get::<String>(DataValue::Text("hi".into())).unwrap(), "hi");
    assert_eq!(
        get::<Vec<u8>>(DataValue::Binary(vec![1, 2])).unwrap(),
        vec![1, 2]
    );
}

#[test]
fn integers_widen_but_never_narrow() {
    // A tinyint column reads fine as any wider integer.
    assert_eq!(get::<i32>(DataValue::TinyInt(3)).unwrap(), 3);
    assert_eq!(get::<i64>(DataValue::SmallInt(3)).unwrap(), 3);
    assert_eq!(get::<i64>(DataValue::Int(3)).unwrap(), 3);

    // But a bigint must not silently truncate into an i32.
    assert!(get::<i32>(DataValue::BigInt(3)).is_err());
    assert!(get::<u8>(DataValue::Int(3)).is_err());
}

#[test]
fn null_reads_as_none() {
    assert_eq!(get::<Option<i32>>(DataValue::Null).unwrap(), None);
    assert_eq!(get::<Option<i32>>(DataValue::Int(1)).unwrap(), Some(1));
    assert_eq!(get::<Option<String>>(DataValue::Null).unwrap(), None);
}

#[test]
fn null_into_non_optional_is_an_error() {
    let err = get::<i32>(DataValue::Null).unwrap_err();
    assert!(matches!(err, Error::Conversion { .. }));
    assert_eq!(
        err.to_string(),
        "cannot convert column 'col' from Null to i32"
    );
}

#[test]
fn mismatched_type_reports_both_sides() {
    let err = get::<i32>(DataValue::Text("x".into())).unwrap_err();
    assert_eq!(
        err.to_string(),
        "cannot convert column 'col' from Text to i32"
    );
}

#[test]
fn binds_native_types() {
    assert_eq!(7i32.to_value(), DataValue::Int(7));
    assert_eq!("hi".to_value(), DataValue::Text("hi".into()));
    assert_eq!(true.to_value(), DataValue::Bool(true));
    assert_eq!(2.5f32.to_value(), DataValue::Float(2.5));
}

#[test]
fn binds_option_as_null() {
    assert_eq!(None::<i32>.to_value(), DataValue::Null);
    assert_eq!(Some(3i32).to_value(), DataValue::Int(3));
}

#[test]
fn from_option_yields_null() {
    assert_eq!(DataValue::from(None::<i32>), DataValue::Null);
    assert_eq!(DataValue::from(Some(3i32)), DataValue::Int(3));
}

#[test]
fn comparisons_widen_across_integer_widths() {
    assert_eq!(DataValue::TinyInt(1), 1i32);
    assert_eq!(DataValue::SmallInt(1), 1i32);
    assert_eq!(DataValue::Int(1), 1i32);
    assert_eq!(DataValue::BigInt(1), 1i32);
    // These did not compile before: there was no PartialEq for i64, i16 or u8.
    assert_eq!(DataValue::BigInt(4), 4i64);
    assert_eq!(DataValue::SmallInt(4), 4i16);
    assert_eq!(DataValue::TinyInt(4), 4u8);
}

#[test]
fn comparisons_reject_other_variants() {
    assert_ne!(DataValue::Text("1".into()), 1i32);
    assert_ne!(DataValue::Null, 1i32);
    assert_ne!(DataValue::Bool(true), 1i32);
}

#[test]
fn null_is_the_default() {
    assert_eq!(DataValue::default(), DataValue::Null);
    assert!(DataValue::Null.is_null());
    assert!(!DataValue::Int(0).is_null());
}

#[test]
fn type_names_are_stable() {
    assert_eq!(DataValue::Int(1).type_name(), "Int");
    assert_eq!(DataValue::Null.type_name(), "Null");
    assert_eq!(DataValue::Text(String::new()).type_name(), "Text");
}

#[test]
fn maps_driver_column_types() {
    assert_eq!(SqlType::from(tiberius::ColumnType::Int4), SqlType::Int);
    assert_eq!(
        SqlType::from(tiberius::ColumnType::Numericn),
        SqlType::Numeric
    );
    assert_eq!(
        SqlType::from(tiberius::ColumnType::BigVarBin),
        SqlType::VarBinary
    );
    assert_eq!(
        SqlType::from(tiberius::ColumnType::NVarchar),
        SqlType::NVarChar
    );
}

#[test]
fn binds_any_timezone_as_datetimeoffset() {
    // The same instant in three zones must bind to the same offset value.
    let utc = Utc.with_ymd_and_hms(2024, 3, 1, 12, 0, 0).unwrap();
    let plus_two = FixedOffset::east_opt(2 * 3600).unwrap();
    let aware = utc.with_timezone(&plus_two);

    let expected = DataValue::DateTimeOffset(utc.fixed_offset());
    assert_eq!(utc.to_value(), expected);
    assert_eq!(aware.to_value(), expected);
    assert_eq!(utc.with_timezone(&Local).to_value(), expected);

    // ...and `From` agrees with `ToSql`.
    assert_eq!(DataValue::from(utc), expected);
    assert_eq!(DataValue::from(aware), expected);
}

#[test]
fn binding_a_zoned_timestamp_keeps_the_wall_clock_of_its_zone() {
    // 14:00 at +02:00 is the same instant as 12:00Z, and that is what goes out.
    let plus_two = FixedOffset::east_opt(2 * 3600).unwrap();
    let aware = plus_two.with_ymd_and_hms(2024, 3, 1, 14, 0, 0).unwrap();

    let DataValue::DateTimeOffset(sent) = aware.to_value() else {
        panic!("expected a datetimeoffset");
    };
    assert_eq!(sent.naive_local().to_string(), "2024-03-01 14:00:00");
    assert_eq!(sent.offset().local_minus_utc(), 2 * 3600);
    assert_eq!(sent.to_utc().to_string(), "2024-03-01 12:00:00 UTC");
}

#[test]
fn reads_datetimeoffset_into_any_zone() {
    let plus_two = FixedOffset::east_opt(2 * 3600).unwrap();
    let aware = plus_two.with_ymd_and_hms(2024, 3, 1, 14, 0, 0).unwrap();
    let stored = DataValue::DateTimeOffset(aware);

    // Reading re-projects the zone but names the same instant.
    assert_eq!(
        get::<DateTime<Utc>>(stored.clone()).unwrap(),
        Utc.with_ymd_and_hms(2024, 3, 1, 12, 0, 0).unwrap()
    );
    assert_eq!(get::<DateTime<Local>>(stored.clone()).unwrap(), aware);
    assert_eq!(get::<DateTime<FixedOffset>>(stored.clone()).unwrap(), aware);
    assert_eq!(get::<Option<DateTime<Utc>>>(DataValue::Null).unwrap(), None);
}

#[test]
fn a_naive_datetime_is_not_silently_called_utc() {
    // `datetime2` carries no offset, so reading one as an aware type would be a
    // guess. It stays an error; the caller picks the zone explicitly.
    let naive = NaiveDate::from_ymd_opt(2024, 3, 1)
        .unwrap()
        .and_hms_opt(12, 0, 0)
        .unwrap();
    let err = get::<DateTime<Utc>>(DataValue::DateTime(naive)).unwrap_err();
    assert_eq!(
        err.to_string(),
        "cannot convert column 'col' from DateTime to DateTime<Utc>"
    );

    // The explicit route works, and is one call.
    assert_eq!(
        naive.and_utc().to_value(),
        DataValue::DateTimeOffset(naive.and_utc().fixed_offset())
    );
}

#[test]
fn compares_equal_across_zones() {
    let utc = Utc.with_ymd_and_hms(2024, 3, 1, 12, 0, 0).unwrap();
    let plus_two = FixedOffset::east_opt(2 * 3600).unwrap();
    let value = DataValue::DateTimeOffset(utc.fixed_offset());

    assert_eq!(value, utc);
    assert_eq!(value, utc.with_timezone(&plus_two));
    assert_ne!(value, utc + chrono::Duration::hours(1));
    assert_ne!(DataValue::Null, utc);
}