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144 lines (125 loc) 路 3.92 KB
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//! Conversions between Rust and SQL types.
//!
//! To see how each SQL type maps to a Rust type, see the corresponding `types` module for each
//! database:
//!
//! * [PostgreSQL](../postgres/types/index.html)
//! * [MySQL](../mysql/types/index.html)
//! * [SQLite](../sqlite/types/index.html)
//!
//! Any external types that have had [`Type`] implemented for, are re-exported in this module
//! for convenience as downstream users need to use a compatible version of the external crate
//! to take advantage of the implementation.
use std::fmt::{Debug, Display};
use crate::database::Database;
#[cfg(feature = "uuid")]
#[cfg_attr(docsrs, doc(cfg(feature = "uuid")))]
pub use uuid::Uuid;
#[cfg(feature = "chrono")]
#[cfg_attr(docsrs, doc(cfg(feature = "chrono")))]
pub mod chrono {
pub use chrono::{DateTime, NaiveDate, NaiveDateTime, NaiveTime, Utc};
}
#[cfg(feature = "time")]
#[cfg_attr(docsrs, doc(cfg(feature = "time")))]
pub mod time {
pub use time::{Date, OffsetDateTime, PrimitiveDateTime, Time, UtcOffset};
}
#[cfg(feature = "bigdecimal")]
#[cfg_attr(docsrs, doc(cfg(feature = "bigdecimal")))]
pub use bigdecimal::BigDecimal;
#[cfg(feature = "ipnetwork")]
#[cfg_attr(docsrs, doc(cfg(feature = "ipnetwork")))]
pub mod ipnetwork {
pub use ipnetwork::{IpNetwork, Ipv4Network, Ipv6Network};
}
#[cfg(feature = "json")]
pub mod json {
use crate::database::Database;
use crate::decode::Decode;
use crate::encode::Encode;
use crate::value::HasRawValue;
use serde_json::value::RawValue as JsonRawValue;
use serde_json::Value as JsonValue;
use std::ops::Deref;
#[cfg_attr(docsrs, doc(cfg(feature = "json")))]
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
pub struct Json<T>(pub T);
impl<T> Deref for Json<T> {
type Target = T;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<T> AsRef<T> for Json<T> {
fn as_ref(&self) -> &T {
&self.0
}
}
impl<DB> Encode<DB> for JsonValue
where
for<'a> Json<&'a Self>: Encode<DB>,
DB: Database,
{
fn encode(&self, buf: &mut DB::RawBuffer) {
<Json<&Self> as Encode<DB>>::encode(&Json(self), buf)
}
}
impl<'de, DB> Decode<'de, DB> for JsonValue
where
Json<Self>: Decode<'de, DB>,
DB: Database,
{
fn decode(value: <DB as HasRawValue<'de>>::RawValue) -> crate::Result<Self> {
<Json<Self> as Decode<DB>>::decode(value).map(|item| item.0)
}
}
// We don't have to implement Encode for JsonRawValue because that's covered by the default
// implementation for Encode
impl<'de, DB> Decode<'de, DB> for &'de JsonRawValue
where
Json<Self>: Decode<'de, DB>,
DB: Database,
{
fn decode(value: <DB as HasRawValue<'de>>::RawValue) -> crate::Result<Self> {
<Json<Self> as Decode<DB>>::decode(value).map(|item| item.0)
}
}
}
#[cfg(feature = "json")]
pub use self::json::Json;
pub trait TypeInfo: PartialEq<Self> + Debug + Display + Clone {
/// Compares type information to determine if `other` is compatible at the Rust level
/// with `self`.
fn compatible(&self, other: &Self) -> bool;
}
/// Indicates that a SQL type is supported for a database.
pub trait Type<DB>
where
DB: Database,
{
/// Returns the canonical type information on the database for the type `T`.
fn type_info() -> DB::TypeInfo;
}
// For references to types in Rust, the underlying SQL type information
// is equivalent
impl<T: ?Sized, DB> Type<DB> for &'_ T
where
DB: Database,
T: Type<DB>,
{
fn type_info() -> DB::TypeInfo {
<T as Type<DB>>::type_info()
}
}
// For optional types in Rust, the underlying SQL type information
// is equivalent
impl<T, DB> Type<DB> for Option<T>
where
DB: Database,
T: Type<DB>,
{
fn type_info() -> DB::TypeInfo {
<T as Type<DB>>::type_info()
}
}