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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666
//! Types which represent a SQL data type.
//!
//! The structs in this module are *only* used as markers to represent a SQL type.
//! They should never be used in your structs.
//! If you'd like to know the rust types which can be used for a given SQL type,
//! see the documentation for that SQL type.
//! Additional types may be provided by other crates.
//!
//! To see which SQL type can be used with a given Rust type,
//! see the "Implementors" section of [`FromSql`].
//!
//! [`FromSql`]: super::deserialize::FromSql
//!
//! Any backend specific types are re-exported through this module
mod fold;
pub mod ops;
mod ord;
pub use self::fold::Foldable;
pub use self::ord::SqlOrd;
use crate::expression::TypedExpressionType;
use crate::query_builder::QueryId;
/// The boolean SQL type.
///
/// On backends without a native boolean type,
/// this is emulated with the smallest supported integer.
///
/// ### [`ToSql`](crate::serialize::ToSql) impls
///
/// - [`bool`][bool]
///
/// ### [`FromSql`](crate::deserialize::FromSql) impls
///
/// - [`bool`][bool]
///
/// [bool]: https://doc.rust-lang.org/nightly/std/primitive.bool.html
#[derive(Debug, Clone, Copy, Default, QueryId, SqlType)]
#[diesel(postgres_type(oid = 16, array_oid = 1000))]
#[diesel(sqlite_type(name = "Integer"))]
#[diesel(mysql_type(name = "Tiny"))]
pub struct Bool;
/// The tiny integer SQL type.
///
/// This is only available on MySQL.
/// Keep in mind that `diesel print-schema` will see `TINYINT(1)` as `Bool`,
/// not `TinyInt`.
///
/// ### [`ToSql`](crate::serialize::ToSql) impls
///
/// - [`i8`][i8]
///
/// ### [`FromSql`](crate::deserialize::FromSql) impls
///
/// - [`i8`][i8]
///
/// [i8]: https://doc.rust-lang.org/nightly/std/primitive.i8.html
#[derive(Debug, Clone, Copy, Default, QueryId, SqlType)]
#[diesel(mysql_type(name = "Tiny"))]
pub struct TinyInt;
#[doc(hidden)]
pub type Tinyint = TinyInt;
/// The small integer SQL type.
///
/// ### [`ToSql`](crate::serialize::ToSql) impls
///
/// - [`i16`][i16]
///
/// ### [`FromSql`](crate::deserialize::FromSql) impls
///
/// - [`i16`][i16]
///
/// [i16]: https://doc.rust-lang.org/nightly/std/primitive.i16.html
#[derive(Debug, Clone, Copy, Default, QueryId, SqlType)]
#[diesel(postgres_type(oid = 21, array_oid = 1005))]
#[diesel(sqlite_type(name = "SmallInt"))]
#[diesel(mysql_type(name = "Short"))]
pub struct SmallInt;
#[doc(hidden)]
pub type Int2 = SmallInt;
#[doc(hidden)]
pub type Smallint = SmallInt;
/// The integer SQL type.
///
/// ### [`ToSql`](crate::serialize::ToSql) impls
///
/// - [`i32`][i32]
///
/// ### [`FromSql`](crate::deserialize::FromSql) impls
///
/// - [`i32`][i32]
///
/// [i32]: https://doc.rust-lang.org/nightly/std/primitive.i32.html
#[derive(Debug, Clone, Copy, Default, QueryId, SqlType)]
#[diesel(postgres_type(oid = 23, array_oid = 1007))]
#[diesel(sqlite_type(name = "Integer"))]
#[diesel(mysql_type(name = "Long"))]
pub struct Integer;
#[doc(hidden)]
pub type Int4 = Integer;
/// The big integer SQL type.
///
/// ### [`ToSql`](crate::serialize::ToSql) impls
///
/// - [`i64`][i64]
///
/// ### [`FromSql`](crate::deserialize::FromSql) impls
///
/// - [`i64`][i64]
///
/// [i64]: https://doc.rust-lang.org/nightly/std/primitive.i64.html
#[derive(Debug, Clone, Copy, Default, QueryId, SqlType)]
#[diesel(postgres_type(oid = 20, array_oid = 1016))]
#[diesel(sqlite_type(name = "Long"))]
#[diesel(mysql_type(name = "LongLong"))]
pub struct BigInt;
#[doc(hidden)]
pub type Int8 = BigInt;
#[doc(hidden)]
pub type Bigint = BigInt;
/// The float SQL type.
///
/// ### [`ToSql`](crate::serialize::ToSql) impls
///
/// - [`f32`][f32]
///
/// ### [`FromSql`](crate::deserialize::FromSql) impls
///
/// - [`f32`][f32]
///
/// [f32]: https://doc.rust-lang.org/nightly/std/primitive.f32.html
#[derive(Debug, Clone, Copy, Default, QueryId, SqlType)]
#[diesel(postgres_type(oid = 700, array_oid = 1021))]
#[diesel(sqlite_type(name = "Float"))]
#[diesel(mysql_type(name = "Float"))]
pub struct Float;
#[doc(hidden)]
pub type Float4 = Float;
/// The double precision float SQL type.
///
/// ### [`ToSql`](crate::serialize::ToSql) impls
///
/// - [`f64`][f64]
///
/// ### [`FromSql`](crate::deserialize::FromSql) impls
///
/// - [`f64`][f64]
///
/// [f64]: https://doc.rust-lang.org/nightly/std/primitive.f64.html
#[derive(Debug, Clone, Copy, Default, QueryId, SqlType)]
#[diesel(postgres_type(oid = 701, array_oid = 1022))]
#[diesel(sqlite_type(name = "Double"))]
#[diesel(mysql_type(name = "Double"))]
pub struct Double;
#[doc(hidden)]
pub type Float8 = Double;
/// The arbitrary precision numeric SQL type.
///
/// This type is only supported on PostgreSQL and MySQL.
/// On SQLite, [`Double`] should be used instead.
///
/// ### [`ToSql`](crate::serialize::ToSql) impls
///
/// - [`bigdecimal::BigDecimal`] with `feature = ["numeric"]`
///
/// ### [`FromSql`](crate::deserialize::FromSql) impls
///
/// - [`bigdecimal::BigDecimal`] with `feature = ["numeric"]`
///
/// [`bigdecimal::BigDecimal`]: /bigdecimal/struct.BigDecimal.html
#[derive(Debug, Clone, Copy, Default, QueryId, SqlType)]
#[diesel(postgres_type(oid = 1700, array_oid = 1231))]
#[diesel(mysql_type(name = "Numeric"))]
#[diesel(sqlite_type(name = "Double"))]
pub struct Numeric;
/// Alias for `Numeric`
pub type Decimal = Numeric;
/// The text SQL type.
///
/// On all backends strings must be valid UTF-8.
/// On PostgreSQL strings must not include nul bytes.
///
/// Schema inference will treat all variants of `TEXT` as this type (e.g.
/// `VARCHAR`, `MEDIUMTEXT`, etc).
///
/// ### [`ToSql`](crate::serialize::ToSql) impls
///
/// - [`String`][String]
/// - [`&str`][str]
///
/// ### [`FromSql`](crate::deserialize::FromSql) impls
///
/// - [`String`][String]
///
/// [String]: std::string::String
/// [str]: https://doc.rust-lang.org/nightly/std/primitive.str.html
#[derive(Debug, Clone, Copy, Default, QueryId, SqlType)]
#[diesel(postgres_type(oid = 25, array_oid = 1009))]
#[diesel(sqlite_type(name = "Text"))]
#[diesel(mysql_type(name = "String"))]
pub struct Text;
/// The SQL `VARCHAR` type
///
/// This type is generally interchangeable with `TEXT`, so Diesel has this as an
/// alias rather than a separate type (Diesel does not currently support
/// implicit coercions).
///
/// One notable exception to this is with arrays on PG. `TEXT[]` cannot be
/// coerced to `VARCHAR[]`. It is recommended that you always use `TEXT[]` if
/// you need a string array on PG.
pub type VarChar = Text;
#[doc(hidden)]
pub type Varchar = VarChar;
#[doc(hidden)]
pub type Char = Text;
#[doc(hidden)]
pub type Tinytext = Text;
#[doc(hidden)]
pub type Mediumtext = Text;
#[doc(hidden)]
pub type Longtext = Text;
/// The binary SQL type.
///
/// Schema inference will treat all variants of `BLOB` as this type (e.g.
/// `VARBINARY`, `MEDIUMBLOB`, etc).
///
/// ### [`ToSql`](crate::serialize::ToSql) impls
///
/// - [`Vec<u8>`][Vec]
/// - [`&[u8]`][slice]
///
/// ### [`FromSql`](crate::deserialize::FromSql) impls
///
/// - [`Vec<u8>`][Vec]
///
/// [Vec]: std::vec::Vec
/// [slice]: https://doc.rust-lang.org/nightly/std/primitive.slice.html
#[derive(Debug, Clone, Copy, Default, QueryId, SqlType)]
#[diesel(postgres_type(oid = 17, array_oid = 1001))]
#[diesel(sqlite_type(name = "Binary"))]
#[diesel(mysql_type(name = "Blob"))]
pub struct Binary;
#[doc(hidden)]
pub type Tinyblob = Binary;
#[doc(hidden)]
pub type Blob = Binary;
#[doc(hidden)]
pub type Mediumblob = Binary;
#[doc(hidden)]
pub type Longblob = Binary;
#[doc(hidden)]
pub type Varbinary = Binary;
#[doc(hidden)]
pub type Bit = Binary;
/// The date SQL type.
///
/// ### [`ToSql`](crate::serialize::ToSql) impls
///
/// - [`chrono::NaiveDate`][NaiveDate] with `feature = "chrono"`
/// - [`time::Date`][Date] with `feature = "time"`
///
/// ### [`FromSql`](crate::deserialize::FromSql) impls
///
/// - [`chrono::NaiveDate`][NaiveDate] with `feature = "chrono"`
/// - [`time::Date`][Date] with `feature = "time"`
///
/// [NaiveDate]: https://docs.rs/chrono/*/chrono/naive/struct.NaiveDate.html
/// [Date]: https://docs.rs/time/0.3.9/time/struct.Date.html
#[derive(Debug, Clone, Copy, Default, QueryId, SqlType)]
#[diesel(postgres_type(oid = 1082, array_oid = 1182))]
#[diesel(sqlite_type(name = "Text"))]
#[diesel(mysql_type(name = "Date"))]
pub struct Date;
/// The interval SQL type.
///
/// This type is currently only implemented for PostgreSQL.
///
/// ### [`ToSql`](crate::serialize::ToSql) impls
///
/// - [`PgInterval`] which can be constructed using [`IntervalDsl`]
///
/// ### [`FromSql`](crate::deserialize::FromSql) impls
///
/// - [`PgInterval`] which can be constructed using [`IntervalDsl`]
///
/// [`PgInterval`]: ../pg/data_types/struct.PgInterval.html
/// [`IntervalDsl`]: ../pg/expression/extensions/trait.IntervalDsl.html
#[derive(Debug, Clone, Copy, Default, QueryId, SqlType)]
#[diesel(postgres_type(oid = 1186, array_oid = 1187))]
pub struct Interval;
/// The time SQL type.
///
/// ### [`ToSql`](crate::serialize::ToSql) impls
///
/// - [`chrono::NaiveTime`][NaiveTime] with `feature = "chrono"`
/// - [`time::Time`][Time] with `feature = "time"`
///
/// ### [`FromSql`](crate::deserialize::FromSql) impls
///
/// - [`chrono::NaiveTime`][NaiveTime] with `feature = "chrono"`
/// - [`time::Time`][Time] with `feature = "time"`
///
/// [NaiveTime]: /chrono/naive/time/struct.NaiveTime.html
/// [Time]: /time/struct.Time.html
#[derive(Debug, Clone, Copy, Default, QueryId, SqlType)]
#[diesel(postgres_type(oid = 1083, array_oid = 1183))]
#[diesel(sqlite_type(name = "Text"))]
#[diesel(mysql_type(name = "Time"))]
pub struct Time;
/// The timestamp SQL type.
///
/// ### [`ToSql`](crate::serialize::ToSql) impls
///
/// - [`std::time::SystemTime`][SystemTime] (PG only)
/// - [`chrono::NaiveDateTime`][NaiveDateTime] with `feature = "chrono"`
/// - [`time::PrimitiveDateTime`] with `feature = "time"`
/// - [`time::OffsetDateTime`] with `feature = "time"`
///
/// ### [`FromSql`](crate::deserialize::FromSql) impls
///
/// - [`std::time::SystemTime`][SystemTime] (PG only)
/// - [`chrono::NaiveDateTime`][NaiveDateTime] with `feature = "chrono"`
/// - [`time::PrimitiveDateTime`] with `feature = "time"`
/// - [`time::OffsetDateTime`] with `feature = "time"`
///
/// [SystemTime]: std::time::SystemTime
#[cfg_attr(
feature = "chrono",
doc = " [NaiveDateTime]: chrono::naive::NaiveDateTime"
)]
#[cfg_attr(
not(feature = "chrono"),
doc = " [NaiveDateTime]: https://docs.rs/chrono/*/chrono/naive/struct.NaiveDateTime.html"
)]
#[cfg_attr(
feature = "time",
doc = " [`time::PrimitiveDateTime`]: time::PrimitiveDateTime"
)]
#[cfg_attr(
not(feature = "time"),
doc = " [`time::PrimitiveDateTime`]: https://docs.rs/time/0.3.9/time/struct.PrimitiveDateTime.html"
)]
#[cfg_attr(
feature = "time",
doc = " [`time::OffsetDateTime`]: time::OffsetDateTime"
)]
#[cfg_attr(
not(feature = "time"),
doc = " [`time::OffsetDateTime`]: https://docs.rs/time/0.3.9/time/struct.OffsetDateTime.html"
)]
/// [Timespec]: /time/struct.Timespec.html
#[derive(Debug, Clone, Copy, Default, QueryId, SqlType)]
#[diesel(postgres_type(oid = 1114, array_oid = 1115))]
#[diesel(sqlite_type(name = "Text"))]
#[diesel(mysql_type(name = "Timestamp"))]
pub struct Timestamp;
/// The JSON SQL type. This type can only be used with `feature =
/// "serde_json"`
///
/// For postgresql you should normally prefer [`Jsonb`](struct.Jsonb.html) instead,
/// for the reasons discussed there.
///
/// ### [`ToSql`] impls
///
/// - [`serde_json::Value`]
///
/// ### [`FromSql`] impls
///
/// - [`serde_json::Value`]
///
/// [`ToSql`]: /serialize/trait.ToSql.html
/// [`FromSql`]: /deserialize/trait.FromSql.html
/// [`serde_json::Value`]: /../serde_json/value/enum.Value.html
#[derive(Debug, Clone, Copy, Default, QueryId, SqlType)]
#[diesel(postgres_type(oid = 114, array_oid = 199))]
#[diesel(mysql_type(name = "String"))]
pub struct Json;
/// The nullable SQL type.
///
/// This wraps another SQL type to indicate that it can be null.
/// By default all values are assumed to be `NOT NULL`.
///
/// ### [`ToSql`](crate::serialize::ToSql) impls
///
/// - Any `T` which implements `ToSql<ST>`
/// - `Option<T>` for any `T` which implements `ToSql<ST>`
///
/// ### [`FromSql`](crate::deserialize::FromSql) impls
///
/// - `Option<T>` for any `T` which implements `FromSql<ST>`
#[derive(Debug, Clone, Copy, Default)]
pub struct Nullable<ST>(ST);
impl<ST> SqlType for Nullable<ST>
where
ST: SqlType,
{
type IsNull = is_nullable::IsNullable;
}
#[doc(inline)]
#[cfg(feature = "postgres_backend")]
pub use crate::pg::sql_types::*;
#[doc(inline)]
#[cfg(feature = "mysql_backend")]
pub use crate::mysql::sql_types::{Datetime, Unsigned};
#[doc(inline)]
#[cfg(feature = "sqlite")]
pub use crate::sqlite::sql_types::Timestamptz as TimestamptzSqlite;
/// Indicates that a SQL type exists for a backend.
///
/// This trait can be derived using the [`SqlType` derive](derive@SqlType)
///
/// # Example
///
/// ```rust
/// #[derive(diesel::sql_types::SqlType)]
/// #[diesel(postgres_type(oid = 23, array_oid = 1007))]
/// #[diesel(sqlite_type(name = "Integer"))]
/// #[diesel(mysql_type(name = "Long"))]
/// pub struct Integer;
/// ```
pub trait HasSqlType<ST>: TypeMetadata {
/// Fetch the metadata for the given type
///
/// This method may use `lookup` to do dynamic runtime lookup. Implementors
/// of this method should not do dynamic lookup unless absolutely necessary
fn metadata(lookup: &mut Self::MetadataLookup) -> Self::TypeMetadata;
}
/// Information about how a backend stores metadata about given SQL types
pub trait TypeMetadata {
/// The actual type used to represent metadata.
///
/// On PostgreSQL, this is the type's OID.
/// On MySQL and SQLite, this is an enum representing all storage classes
/// they support.
type TypeMetadata;
/// The type used for runtime lookup of metadata.
///
/// For most backends, which don't support user defined types, this will
/// be `()`.
type MetadataLookup: ?Sized;
}
/// Converts a type which may or may not be nullable into its nullable
/// representation.
pub trait IntoNullable {
/// The nullable representation of this type.
///
/// For all types except `Nullable`, this will be `Nullable<Self>`.
type Nullable;
}
impl<T> IntoNullable for T
where
T: SqlType<IsNull = is_nullable::NotNull> + SingleValue,
{
type Nullable = Nullable<T>;
}
impl<T> IntoNullable for Nullable<T>
where
T: SqlType,
{
type Nullable = Self;
}
/// Converts a type which may or may not be nullable into its not nullable
/// representation.
pub trait IntoNotNullable {
/// The not nullable representation of this type.
///
/// For `Nullable<T>`, this will be `T` otherwise the type itself
type NotNullable;
}
impl<T> IntoNotNullable for T
where
T: SqlType<IsNull = is_nullable::NotNull>,
{
type NotNullable = T;
}
impl<T> IntoNotNullable for Nullable<T>
where
T: SqlType,
{
type NotNullable = T;
}
/// A marker trait indicating that a SQL type represents a single value, as
/// opposed to a list of values.
///
/// This trait should generally be implemented for all SQL types with the
/// exception of Rust tuples. If a column could have this as its type, this
/// trait should be implemented.
///
/// # Deriving
///
/// This trait is automatically implemented by [`#[derive(SqlType)]`](derive@SqlType)
///
pub trait SingleValue: SqlType {}
impl<T: SqlType + SingleValue> SingleValue for Nullable<T> {}
#[doc(inline)]
pub use diesel_derives::DieselNumericOps;
#[doc(inline)]
pub use diesel_derives::SqlType;
/// A marker trait for SQL types
///
/// # Deriving
///
/// This trait is automatically implemented by [`#[derive(SqlType)]`](derive@SqlType)
/// which sets `IsNull` to [`is_nullable::NotNull`]
///
pub trait SqlType: 'static {
/// Is this type nullable?
///
/// This type should always be one of the structs in the ['is_nullable`]
/// module. See the documentation of those structs for more details.
///
/// ['is_nullable`]: is_nullable
type IsNull: OneIsNullable<is_nullable::IsNullable> + OneIsNullable<is_nullable::NotNull>;
}
/// Is one value of `IsNull` nullable?
///
/// You should never implement this trait.
pub trait OneIsNullable<Other> {
/// See the trait documentation
type Out: OneIsNullable<is_nullable::IsNullable> + OneIsNullable<is_nullable::NotNull>;
}
/// Are both values of `IsNull` are nullable?
pub trait AllAreNullable<Other> {
/// See the trait documentation
type Out: AllAreNullable<is_nullable::NotNull> + AllAreNullable<is_nullable::IsNullable>;
}
/// A type level constructor for maybe nullable types
///
/// Constructs either `Nullable<O>` (for `Self` == `is_nullable::IsNullable`)
/// or `O` (for `Self` == `is_nullable::NotNull`)
pub trait MaybeNullableType<O> {
/// See the trait documentation
type Out: SqlType + TypedExpressionType;
}
/// Possible values for `SqlType::IsNullable`
pub mod is_nullable {
use super::*;
/// No, this type cannot be null as it is marked as `NOT NULL` at database level
///
/// This should be choosen for basically all manual impls of `SqlType`
/// beside implementing your own `Nullable<>` wrapper type
#[derive(Debug, Clone, Copy)]
pub struct NotNull;
/// Yes, this type can be null
///
/// The only diesel provided `SqlType` that uses this value is [`Nullable<T>`]
///
/// [`Nullable<T>`]: Nullable
#[derive(Debug, Clone, Copy)]
pub struct IsNullable;
impl OneIsNullable<NotNull> for NotNull {
type Out = NotNull;
}
impl OneIsNullable<IsNullable> for NotNull {
type Out = IsNullable;
}
impl OneIsNullable<NotNull> for IsNullable {
type Out = IsNullable;
}
impl OneIsNullable<IsNullable> for IsNullable {
type Out = IsNullable;
}
impl AllAreNullable<NotNull> for NotNull {
type Out = NotNull;
}
impl AllAreNullable<IsNullable> for NotNull {
type Out = NotNull;
}
impl AllAreNullable<NotNull> for IsNullable {
type Out = NotNull;
}
impl AllAreNullable<IsNullable> for IsNullable {
type Out = IsNullable;
}
impl<O> MaybeNullableType<O> for NotNull
where
O: SqlType + TypedExpressionType,
{
type Out = O;
}
impl<O> MaybeNullableType<O> for IsNullable
where
O: SqlType,
Nullable<O>: TypedExpressionType,
{
type Out = Nullable<O>;
}
/// Represents the output type of [`MaybeNullableType`]
pub type MaybeNullable<N, T> = <N as MaybeNullableType<T>>::Out;
/// Represents the output type of [`OneIsNullable`]
/// for two given SQL types
pub type IsOneNullable<S1, S2> =
<IsSqlTypeNullable<S1> as OneIsNullable<IsSqlTypeNullable<S2>>>::Out;
/// Represents the output type of [`AllAreNullable`]
/// for two given SQL types
pub type AreAllNullable<S1, S2> =
<IsSqlTypeNullable<S1> as AllAreNullable<IsSqlTypeNullable<S2>>>::Out;
/// Represents if the SQL type is nullable or not
pub type IsSqlTypeNullable<T> = <T as SqlType>::IsNull;
}
/// A marker trait for accepting expressions of the type `Bool` and
/// `Nullable<Bool>` in the same place
pub trait BoolOrNullableBool {}
impl BoolOrNullableBool for Bool {}
impl BoolOrNullableBool for Nullable<Bool> {}
#[doc(inline)]
pub use crate::expression::expression_types::Untyped;