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a470682572
* Add Query builder
* Make query_builder.rs in sqlx-core
* Add QueryBuilder::new()
* Add QueryBuilder::push()
* Define questions for documentation
* Get new, push, push_bind working with types
* Handle postgres' numbered bind varaibles
* Add a test for QueryBuilder#build
* Move arguments into Option
* Refactor query builder
* Finish testing QueryBuilder#build
* Remove design doc
* Add a test for pushing strings with push_bind
* Integration test green
* Adjust some tests
* Make query builder generic about placeholder segmenent ('$N' or '?')
* Run fmt
* Redesign Arguments#format_placeholder in line with code review
* Use write! to push sql to QueryBuilder
* Add QueryBuilder::reset to allow for QueryBuilder reuse
* Run cargo fmt
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, HasArguments};
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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: HasArguments<'q>>: Sized + Send {
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fn into_arguments(self) -> <DB as HasArguments<'q>>::Arguments;
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}
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// NOTE: required due to lack of lazy normalization
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#[allow(unused_macros)]
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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: HasArguments<'q>>(pub <DB as HasArguments<'q>>::Arguments);
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impl<'q, DB: HasArguments<'q>> IntoArguments<'q, DB> for ImmutableArguments<'q, DB> {
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fn into_arguments(self) -> <DB as HasArguments<'q>>::Arguments {
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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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