forked from transact-rs/sqlx
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathvalue.rs
More file actions
251 lines (205 loc) 路 6.45 KB
/
Copy pathvalue.rs
File metadata and controls
251 lines (205 loc) 路 6.45 KB
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
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
use std::ptr::NonNull;
use std::slice::from_raw_parts;
use std::str::from_utf8;
use std::sync::Arc;
use libsqlite3_sys::{
sqlite3_value, sqlite3_value_blob, sqlite3_value_bytes, sqlite3_value_double,
sqlite3_value_dup, sqlite3_value_free, sqlite3_value_int, sqlite3_value_int64,
sqlite3_value_type, SQLITE_NULL,
};
use crate::error::BoxDynError;
use crate::sqlite::statement::StatementHandle;
use crate::sqlite::type_info::DataType;
use crate::sqlite::{Sqlite, SqliteTypeInfo};
use crate::value::{Value, ValueRef};
use std::borrow::Cow;
enum SqliteValueData<'r> {
Statement {
statement: &'r StatementHandle,
type_info: SqliteTypeInfo,
index: usize,
},
Value(&'r SqliteValue),
}
pub struct SqliteValueRef<'r>(SqliteValueData<'r>);
impl<'r> SqliteValueRef<'r> {
pub(crate) fn value(value: &'r SqliteValue) -> Self {
Self(SqliteValueData::Value(value))
}
pub(crate) fn statement(
statement: &'r StatementHandle,
type_info: SqliteTypeInfo,
index: usize,
) -> Self {
Self(SqliteValueData::Statement {
statement,
type_info,
index,
})
}
pub(super) fn int(&self) -> i32 {
match self.0 {
SqliteValueData::Statement {
statement, index, ..
} => statement.column_int(index),
SqliteValueData::Value(v) => v.int(),
}
}
pub(super) fn int64(&self) -> i64 {
match self.0 {
SqliteValueData::Statement {
statement, index, ..
} => statement.column_int64(index),
SqliteValueData::Value(v) => v.int64(),
}
}
pub(super) fn double(&self) -> f64 {
match self.0 {
SqliteValueData::Statement {
statement, index, ..
} => statement.column_double(index),
SqliteValueData::Value(v) => v.double(),
}
}
pub(super) fn blob(&self) -> &'r [u8] {
match self.0 {
SqliteValueData::Statement {
statement, index, ..
} => statement.column_blob(index),
SqliteValueData::Value(v) => v.blob(),
}
}
pub(super) fn text(&self) -> Result<&'r str, BoxDynError> {
match self.0 {
SqliteValueData::Statement {
statement, index, ..
} => statement.column_text(index),
SqliteValueData::Value(v) => v.text(),
}
}
}
impl<'r> ValueRef<'r> for SqliteValueRef<'r> {
type Database = Sqlite;
fn to_owned(&self) -> SqliteValue {
match self.0 {
SqliteValueData::Statement {
statement,
index,
ref type_info,
} => unsafe { SqliteValue::new(statement.column_value(index), type_info.clone()) },
SqliteValueData::Value(v) => v.clone(),
}
}
fn type_info(&self) -> Cow<'_, SqliteTypeInfo> {
match self.0 {
SqliteValueData::Value(v) => v.type_info(),
SqliteValueData::Statement {
ref type_info,
statement,
index,
} => statement
.column_type_info_opt(index)
.map(Cow::Owned)
.unwrap_or(Cow::Borrowed(type_info)),
}
}
fn is_null(&self) -> bool {
match self.0 {
SqliteValueData::Statement {
statement, index, ..
} => statement.column_type(index) == SQLITE_NULL,
SqliteValueData::Value(v) => v.is_null(),
}
}
}
#[derive(Clone)]
pub struct SqliteValue {
pub(crate) handle: Arc<ValueHandle>,
pub(crate) type_info: SqliteTypeInfo,
}
pub(crate) struct ValueHandle(NonNull<sqlite3_value>);
// SAFE: only protected value objects are stored in SqliteValue
unsafe impl Send for ValueHandle {}
unsafe impl Sync for ValueHandle {}
impl SqliteValue {
pub(crate) unsafe fn new(value: *mut sqlite3_value, type_info: SqliteTypeInfo) -> Self {
debug_assert!(!value.is_null());
Self {
type_info,
handle: Arc::new(ValueHandle(NonNull::new_unchecked(sqlite3_value_dup(
value,
)))),
}
}
fn type_info_opt(&self) -> Option<SqliteTypeInfo> {
let dt = DataType::from_code(unsafe { sqlite3_value_type(self.handle.0.as_ptr()) });
if let DataType::Null = dt {
None
} else {
Some(SqliteTypeInfo(dt))
}
}
fn int(&self) -> i32 {
unsafe { sqlite3_value_int(self.handle.0.as_ptr()) }
}
fn int64(&self) -> i64 {
unsafe { sqlite3_value_int64(self.handle.0.as_ptr()) }
}
fn double(&self) -> f64 {
unsafe { sqlite3_value_double(self.handle.0.as_ptr()) }
}
fn blob(&self) -> &[u8] {
let len = unsafe { sqlite3_value_bytes(self.handle.0.as_ptr()) } as usize;
if len == 0 {
// empty blobs are NULL so just return an empty slice
return &[];
}
let ptr = unsafe { sqlite3_value_blob(self.handle.0.as_ptr()) } as *const u8;
debug_assert!(!ptr.is_null());
unsafe { from_raw_parts(ptr, len) }
}
fn text(&self) -> Result<&str, BoxDynError> {
Ok(from_utf8(self.blob())?)
}
}
impl Value for SqliteValue {
type Database = Sqlite;
fn as_ref(&self) -> SqliteValueRef<'_> {
SqliteValueRef::value(self)
}
fn type_info(&self) -> Cow<'_, SqliteTypeInfo> {
self.type_info_opt()
.map(Cow::Owned)
.unwrap_or(Cow::Borrowed(&self.type_info))
}
fn is_null(&self) -> bool {
unsafe { sqlite3_value_type(self.handle.0.as_ptr()) == SQLITE_NULL }
}
}
impl Drop for ValueHandle {
fn drop(&mut self) {
unsafe {
sqlite3_value_free(self.0.as_ptr());
}
}
}
#[cfg(feature = "any")]
impl<'r> From<SqliteValueRef<'r>> for crate::any::AnyValueRef<'r> {
#[inline]
fn from(value: SqliteValueRef<'r>) -> Self {
crate::any::AnyValueRef {
type_info: value.type_info().clone().into_owned().into(),
kind: crate::any::value::AnyValueRefKind::Sqlite(value),
}
}
}
#[cfg(feature = "any")]
impl From<SqliteValue> for crate::any::AnyValue {
#[inline]
fn from(value: SqliteValue) -> Self {
crate::any::AnyValue {
type_info: value.type_info().clone().into_owned().into(),
kind: crate::any::value::AnyValueKind::Sqlite(value),
}
}
}