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Copy pathencode.rs
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216 lines (189 loc) · 5.81 KB
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//! Provides [`Encode`] for encoding values for the database.
use std::borrow::Cow;
use std::mem;
use std::rc::Rc;
use std::sync::Arc;
use crate::database::Database;
use crate::error::BoxDynError;
/// The return type of [Encode::encode].
#[must_use]
pub enum IsNull {
/// The value is null; no data was written.
Yes,
/// The value is not null.
///
/// This does not mean that data was written.
No,
}
impl IsNull {
pub fn is_null(&self) -> bool {
matches!(self, IsNull::Yes)
}
}
/// Encode a single value to be sent to the database.
pub trait Encode<'q, DB: Database> {
/// Writes the value of `self` into `buf` in the expected format for the database.
fn encode(self, buf: &mut <DB as Database>::ArgumentBuffer) -> Result<IsNull, BoxDynError>
where
Self: Sized,
{
self.encode_by_ref(buf)
}
/// Writes the value of `self` into `buf` without moving `self`.
///
/// Where possible, make use of `encode` instead as it can take advantage of re-using
/// memory.
fn encode_by_ref(
&self,
buf: &mut <DB as Database>::ArgumentBuffer,
) -> Result<IsNull, BoxDynError>;
fn produces(&self) -> Option<DB::TypeInfo> {
// `produces` is inherently a hook to allow database drivers to produce value-dependent
// type information; if the driver doesn't need this, it can leave this as `None`
None
}
#[inline]
fn size_hint(&self) -> usize {
mem::size_of_val(self)
}
}
impl<'q, T, DB: Database> Encode<'q, DB> for &'_ T
where
T: Encode<'q, DB>,
{
#[inline]
fn encode(self, buf: &mut <DB as Database>::ArgumentBuffer) -> Result<IsNull, BoxDynError> {
<T as Encode<DB>>::encode_by_ref(self, buf)
}
#[inline]
fn encode_by_ref(
&self,
buf: &mut <DB as Database>::ArgumentBuffer,
) -> Result<IsNull, BoxDynError> {
<&T as Encode<DB>>::encode(self, buf)
}
#[inline]
fn produces(&self) -> Option<DB::TypeInfo> {
(**self).produces()
}
#[inline]
fn size_hint(&self) -> usize {
(**self).size_hint()
}
}
#[macro_export]
macro_rules! impl_encode_for_option {
($DB:ident) => {
impl<'q, T> $crate::encode::Encode<'q, $DB> for Option<T>
where
T: $crate::encode::Encode<'q, $DB> + $crate::types::Type<$DB> + 'q,
{
#[inline]
fn produces(&self) -> Option<<$DB as $crate::database::Database>::TypeInfo> {
if let Some(v) = self {
v.produces()
} else {
T::type_info().into()
}
}
#[inline]
fn encode(
self,
buf: &mut <$DB as $crate::database::Database>::ArgumentBuffer,
) -> Result<$crate::encode::IsNull, $crate::error::BoxDynError> {
if let Some(v) = self {
v.encode(buf)
} else {
Ok($crate::encode::IsNull::Yes)
}
}
#[inline]
fn encode_by_ref(
&self,
buf: &mut <$DB as $crate::database::Database>::ArgumentBuffer,
) -> Result<$crate::encode::IsNull, $crate::error::BoxDynError> {
if let Some(v) = self {
v.encode_by_ref(buf)
} else {
Ok($crate::encode::IsNull::Yes)
}
}
#[inline]
fn size_hint(&self) -> usize {
self.as_ref().map_or(0, $crate::encode::Encode::size_hint)
}
}
};
}
macro_rules! impl_encode_for_smartpointer {
($smart_pointer:ty) => {
impl<'q, T, DB: Database> Encode<'q, DB> for $smart_pointer
where
T: Encode<'q, DB>,
{
#[inline]
fn encode(
self,
buf: &mut <DB as Database>::ArgumentBuffer,
) -> Result<IsNull, BoxDynError> {
<T as Encode<DB>>::encode_by_ref(self.as_ref(), buf)
}
#[inline]
fn encode_by_ref(
&self,
buf: &mut <DB as Database>::ArgumentBuffer,
) -> Result<IsNull, BoxDynError> {
<&T as Encode<DB>>::encode(self, buf)
}
#[inline]
fn produces(&self) -> Option<DB::TypeInfo> {
(**self).produces()
}
#[inline]
fn size_hint(&self) -> usize {
(**self).size_hint()
}
}
};
}
impl_encode_for_smartpointer!(Arc<T>);
impl_encode_for_smartpointer!(Box<T>);
impl_encode_for_smartpointer!(Rc<T>);
impl<'q, T, DB: Database> Encode<'q, DB> for Cow<'q, T>
where
T: Encode<'q, DB>,
T: ToOwned,
{
#[inline]
fn encode(self, buf: &mut <DB as Database>::ArgumentBuffer) -> Result<IsNull, BoxDynError> {
<&T as Encode<DB>>::encode_by_ref(&self.as_ref(), buf)
}
#[inline]
fn encode_by_ref(
&self,
buf: &mut <DB as Database>::ArgumentBuffer,
) -> Result<IsNull, BoxDynError> {
<&T as Encode<DB>>::encode_by_ref(&self.as_ref(), buf)
}
#[inline]
fn produces(&self) -> Option<DB::TypeInfo> {
<&T as Encode<DB>>::produces(&self.as_ref())
}
#[inline]
fn size_hint(&self) -> usize {
<&T as Encode<DB>>::size_hint(&self.as_ref())
}
}
#[macro_export]
macro_rules! forward_encode_impl {
($for_type:ty, $forward_to:ty, $db:ident) => {
impl<'q> Encode<'q, $db> for $for_type {
fn encode_by_ref(
&self,
buf: &mut <$db as sqlx_core::database::Database>::ArgumentBuffer,
) -> Result<IsNull, BoxDynError> {
<$forward_to as Encode<$db>>::encode(self.as_ref(), buf)
}
}
};
}