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
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
use std::error::Error;
use std::io::Write;

use crate::backend::{self, Backend, BinaryRawValue};
use crate::deserialize::{self, FromSql, FromSqlRow, Queryable};
use crate::serialize::{self, IsNull, Output, ToSql};
use crate::sql_types::{
    self, BigInt, Binary, Bool, Double, Float, Integer, NotNull, SmallInt, Text,
};

#[allow(dead_code)]
mod foreign_impls {
    use super::*;

    #[derive(FromSqlRow, AsExpression)]
    #[diesel(foreign_derive)]
    #[sql_type = "Bool"]
    struct BoolProxy(bool);

    #[derive(FromSqlRow, AsExpression)]
    #[diesel(foreign_derive)]
    #[cfg_attr(feature = "mysql", sql_type = "crate::sql_types::TinyInt")]
    struct I8Proxy(i8);

    #[derive(FromSqlRow, AsExpression)]
    #[diesel(foreign_derive)]
    #[sql_type = "SmallInt"]
    struct I16Proxy(i16);

    #[derive(FromSqlRow, AsExpression)]
    #[diesel(foreign_derive)]
    #[sql_type = "Integer"]
    struct I32Proxy(i32);

    #[derive(FromSqlRow, AsExpression)]
    #[diesel(foreign_derive)]
    #[sql_type = "BigInt"]
    struct I64Proxy(i64);

    #[derive(FromSqlRow, AsExpression)]
    #[diesel(foreign_derive)]
    #[cfg_attr(
        feature = "mysql",
        sql_type = "crate::sql_types::Unsigned<crate::sql_types::TinyInt>"
    )]
    struct U8Proxy(u8);

    #[derive(FromSqlRow, AsExpression)]
    #[diesel(foreign_derive)]
    #[cfg_attr(feature = "mysql", sql_type = "crate::sql_types::Unsigned<SmallInt>")]
    struct U16Proxy(u16);

    #[derive(FromSqlRow, AsExpression)]
    #[diesel(foreign_derive)]
    #[cfg_attr(feature = "mysql", sql_type = "crate::sql_types::Unsigned<Integer>")]
    #[cfg_attr(feature = "postgres", sql_type = "crate::sql_types::Oid")]
    struct U32Proxy(u32);

    #[derive(FromSqlRow, AsExpression)]
    #[diesel(foreign_derive)]
    #[cfg_attr(feature = "mysql", sql_type = "crate::sql_types::Unsigned<BigInt>")]
    struct U64Proxy(u64);

    #[derive(FromSqlRow, AsExpression)]
    #[diesel(foreign_derive)]
    #[sql_type = "Float"]
    struct F32Proxy(f32);

    #[derive(FromSqlRow, AsExpression)]
    #[diesel(foreign_derive)]
    #[sql_type = "Double"]
    struct F64Proxy(f64);

    #[derive(FromSqlRow, AsExpression)]
    #[diesel(foreign_derive)]
    #[sql_type = "Text"]
    #[cfg_attr(feature = "sqlite", sql_type = "crate::sql_types::Date")]
    #[cfg_attr(feature = "sqlite", sql_type = "crate::sql_types::Time")]
    #[cfg_attr(feature = "sqlite", sql_type = "crate::sql_types::Timestamp")]
    struct StringProxy(String);

    #[derive(AsExpression)]
    #[diesel(foreign_derive, not_sized)]
    #[sql_type = "Text"]
    #[cfg_attr(feature = "sqlite", sql_type = "crate::sql_types::Date")]
    #[cfg_attr(feature = "sqlite", sql_type = "crate::sql_types::Time")]
    #[cfg_attr(feature = "sqlite", sql_type = "crate::sql_types::Timestamp")]
    struct StrProxy(str);

    #[derive(FromSqlRow)]
    #[diesel(foreign_derive)]
    struct VecProxy<T>(Vec<T>);

    #[derive(AsExpression)]
    #[diesel(foreign_derive)]
    #[sql_type = "Binary"]
    struct BinaryVecProxy(Vec<u8>);

    #[derive(AsExpression)]
    #[diesel(foreign_derive, not_sized)]
    #[sql_type = "Binary"]
    struct BinarySliceProxy([u8]);
}

impl NotNull for () {}

impl<ST, DB> FromSql<ST, DB> for String
where
    DB: Backend,
    *const str: FromSql<ST, DB>,
{
    fn from_sql(bytes: Option<backend::RawValue<DB>>) -> deserialize::Result<Self> {
        let str_ptr = <*const str as FromSql<ST, DB>>::from_sql(bytes)?;
        // We know that the pointer impl will never return null
        let string = unsafe { &*str_ptr };
        Ok(string.to_owned())
    }
}

/// The returned pointer is *only* valid for the lifetime to the argument of
/// `from_sql`. This impl is intended for uses where you want to write a new
/// impl in terms of `String`, but don't want to allocate. We have to return a
/// raw pointer instead of a reference with a lifetime due to the structure of
/// `FromSql`
#[cfg(not(feature = "unstable"))]
impl<DB> FromSql<sql_types::Text, DB> for *const str
where
    DB: Backend + for<'a> BinaryRawValue<'a>,
{
    fn from_sql(value: Option<crate::backend::RawValue<DB>>) -> deserialize::Result<Self> {
        use std::str;
        let value = not_none!(value);
        let string = str::from_utf8(DB::as_bytes(value))?;
        Ok(string as *const _)
    }
}

#[cfg(feature = "unstable")]
impl<DB> FromSql<sql_types::Text, DB> for *const str
where
    DB: Backend + for<'a> BinaryRawValue<'a>,
{
    default fn from_sql(value: Option<crate::backend::RawValue<DB>>) -> deserialize::Result<Self> {
        use std::str;
        let value = not_none!(value);
        let string = str::from_utf8(DB::as_bytes(value))?;
        Ok(string as *const _)
    }
}

impl<DB: Backend> ToSql<sql_types::Text, DB> for str {
    fn to_sql<W: Write>(&self, out: &mut Output<W, DB>) -> serialize::Result {
        out.write_all(self.as_bytes())
            .map(|_| IsNull::No)
            .map_err(|e| Box::new(e) as Box<dyn Error + Send + Sync>)
    }
}

impl<DB> ToSql<sql_types::Text, DB> for String
where
    DB: Backend,
    str: ToSql<sql_types::Text, DB>,
{
    fn to_sql<W: Write>(&self, out: &mut Output<W, DB>) -> serialize::Result {
        (self as &str).to_sql(out)
    }
}

impl<ST, DB> FromSql<ST, DB> for Vec<u8>
where
    DB: Backend,
    *const [u8]: FromSql<ST, DB>,
{
    fn from_sql(bytes: Option<backend::RawValue<DB>>) -> deserialize::Result<Self> {
        let slice_ptr = <*const [u8] as FromSql<ST, DB>>::from_sql(bytes)?;
        // We know that the pointer impl will never return null
        let bytes = unsafe { &*slice_ptr };
        Ok(bytes.to_owned())
    }
}

/// The returned pointer is *only* valid for the lifetime to the argument of
/// `from_sql`. This impl is intended for uses where you want to write a new
/// impl in terms of `Vec<u8>`, but don't want to allocate. We have to return a
/// raw pointer instead of a reference with a lifetime due to the structure of
/// `FromSql`
impl<DB> FromSql<sql_types::Binary, DB> for *const [u8]
where
    DB: Backend + for<'a> BinaryRawValue<'a>,
{
    fn from_sql(bytes: Option<backend::RawValue<DB>>) -> deserialize::Result<Self> {
        Ok(DB::as_bytes(not_none!(bytes)) as *const _)
    }
}

impl<DB> ToSql<sql_types::Binary, DB> for Vec<u8>
where
    DB: Backend,
    [u8]: ToSql<sql_types::Binary, DB>,
{
    fn to_sql<W: Write>(&self, out: &mut Output<W, DB>) -> serialize::Result {
        (self as &[u8]).to_sql(out)
    }
}

impl<DB: Backend> ToSql<sql_types::Binary, DB> for [u8] {
    fn to_sql<W: Write>(&self, out: &mut Output<W, DB>) -> serialize::Result {
        out.write_all(self)
            .map(|_| IsNull::No)
            .map_err(|e| Box::new(e) as Box<dyn Error + Send + Sync>)
    }
}

use std::borrow::{Cow, ToOwned};
use std::fmt;
impl<'a, T: ?Sized, ST, DB> ToSql<ST, DB> for Cow<'a, T>
where
    T: 'a + ToOwned + ToSql<ST, DB>,
    DB: Backend,
    Self: fmt::Debug,
{
    fn to_sql<W: Write>(&self, out: &mut Output<W, DB>) -> serialize::Result {
        ToSql::<ST, DB>::to_sql(&**self, out)
    }
}

impl<'a, T: ?Sized, ST, DB> FromSql<ST, DB> for Cow<'a, T>
where
    T: 'a + ToOwned,
    DB: Backend,
    T::Owned: FromSql<ST, DB>,
{
    fn from_sql(bytes: Option<backend::RawValue<DB>>) -> deserialize::Result<Self> {
        T::Owned::from_sql(bytes).map(Cow::Owned)
    }
}

impl<'a, T: ?Sized, ST, DB> FromSqlRow<ST, DB> for Cow<'a, T>
where
    T: 'a + ToOwned,
    DB: Backend,
    Cow<'a, T>: FromSql<ST, DB>,
{
    fn build_from_row<R: crate::row::Row<DB>>(row: &mut R) -> deserialize::Result<Self> {
        FromSql::<ST, DB>::from_sql(row.take())
    }
}

impl<'a, T: ?Sized, ST, DB> Queryable<ST, DB> for Cow<'a, T>
where
    T: 'a + ToOwned,
    DB: Backend,
    Self: FromSqlRow<ST, DB>,
{
    type Row = Self;

    fn build(row: Self::Row) -> Self {
        row
    }
}

use crate::expression::bound::Bound;
use crate::expression::{AsExpression, Expression};

impl<'a, T: ?Sized, ST> AsExpression<ST> for Cow<'a, T>
where
    T: 'a + ToOwned,
    Bound<ST, Cow<'a, T>>: Expression<SqlType = ST>,
{
    type Expression = Bound<ST, Self>;

    fn as_expression(self) -> Self::Expression {
        Bound::new(self)
    }
}

impl<'a, 'b, T: ?Sized, ST> AsExpression<ST> for &'b Cow<'a, T>
where
    T: 'a + ToOwned,
    Bound<ST, &'b T>: Expression<SqlType = ST>,
{
    type Expression = Bound<ST, &'b T>;

    fn as_expression(self) -> Self::Expression {
        Bound::new(&**self)
    }
}