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* HasValueRef, HasArguments, HasStatement -> Database GATs replace the associated types from the generic traits `HasValueRef<'r>`, `HasArguments<'q>` and `HasStatement<'q>` with generic associated types in `Database` * fixup after rebase --------- Co-authored-by: Austin Bonander <austin.bonander@gmail.com>
58 lines
1.8 KiB
Rust
58 lines
1.8 KiB
Rust
//! Types and traits for passing arguments to SQL queries.
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use crate::database::Database;
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use crate::encode::Encode;
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use crate::types::Type;
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use std::fmt::{self, Write};
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/// A tuple of arguments to be sent to the database.
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pub trait Arguments<'q>: Send + Sized + Default {
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type Database: Database;
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/// Reserves the capacity for at least `additional` more values (of `size` total bytes) to
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/// be added to the arguments without a reallocation.
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fn reserve(&mut self, additional: usize, size: usize);
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/// Add the value to the end of the arguments.
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fn add<T>(&mut self, value: T)
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where
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T: 'q + Send + Encode<'q, Self::Database> + Type<Self::Database>;
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fn format_placeholder<W: Write>(&self, writer: &mut W) -> fmt::Result {
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writer.write_str("?")
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}
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}
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pub trait IntoArguments<'q, DB: Database>: Sized + Send {
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fn into_arguments(self) -> <DB as Database>::Arguments<'q>;
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}
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// NOTE: required due to lack of lazy normalization
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#[macro_export]
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macro_rules! impl_into_arguments_for_arguments {
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($Arguments:path) => {
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impl<'q>
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$crate::arguments::IntoArguments<
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'q,
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<$Arguments as $crate::arguments::Arguments<'q>>::Database,
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> for $Arguments
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{
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fn into_arguments(self) -> $Arguments {
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self
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}
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}
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};
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}
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/// used by the query macros to prevent supernumerary `.bind()` calls
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pub struct ImmutableArguments<'q, DB: Database>(pub <DB as Database>::Arguments<'q>);
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impl<'q, DB: Database> IntoArguments<'q, DB> for ImmutableArguments<'q, DB> {
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fn into_arguments(self) -> <DB as Database>::Arguments<'q> {
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self.0
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}
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}
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// TODO: Impl `IntoArguments` for &[&dyn Encode]
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// TODO: Impl `IntoArguments` for (impl Encode, ...) x16
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