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218 lines (190 loc) 路 5.27 KB
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//! Contains the Row and FromRow traits.
use crate::database::{Database, HasRawValue, HasRow};
use crate::decode::Decode;
use crate::types::Type;
pub trait ColumnIndex<DB>
where
DB: Database,
DB: for<'c> HasRow<'c, Database = DB>,
{
fn resolve<'c>(self, row: &<DB as HasRow<'c>>::Row) -> crate::Result<usize>;
}
/// Represents a single row of the result set.
pub trait Row<'c>: Unpin + Send {
type Database: Database + ?Sized;
/// Returns `true` if the row contains no values.
fn is_empty(&self) -> bool {
self.len() == 0
}
/// Returns the number of values in the row.
fn len(&self) -> usize;
fn get<'r, T, I>(&'r self, index: I) -> T
where
T: Type<Self::Database>,
I: ColumnIndex<Self::Database>,
T: Decode<'c, Self::Database>,
{
self.try_get::<T, I>(index).unwrap()
}
fn try_get<'r, T, I>(&'r self, index: I) -> crate::Result<T>
where
T: Type<Self::Database>,
I: ColumnIndex<Self::Database>,
T: Decode<'c, Self::Database>,
{
Ok(Decode::decode(self.try_get_raw(index)?)?)
}
fn try_get_raw<'r, I>(
&self,
index: I,
) -> crate::Result<<Self::Database as HasRawValue<'c>>::RawValue>
where
I: ColumnIndex<Self::Database>;
}
/// A **record** that can be built from a row returned from by the database.
pub trait FromRow<'c, R>
where
Self: Sized,
R: Row<'c>,
{
fn from_row(row: R) -> crate::Result<Self>;
}
// Macros to help unify the internal implementations as a good chunk
// is very similar
#[allow(unused_macros)]
macro_rules! impl_from_row_for_tuple {
($db:ident, $r:ident; $( ($idx:tt) -> $T:ident );+;) => {
impl<'c, $($T,)+> crate::row::FromRow<'c, $r<'c>> for ($($T,)+)
where
$($T: crate::types::Type<$db>,)+
$($T: crate::decode::Decode<'c, $db>,)+
{
#[inline]
fn from_row(row: $r<'c>) -> crate::Result<Self> {
use crate::row::Row;
Ok(($(row.try_get($idx as usize)?,)+))
}
}
};
}
#[allow(unused_macros)]
macro_rules! impl_from_row_for_tuples {
($db:ident, $r:ident) => {
impl_from_row_for_tuple!($db, $r;
(0) -> T1;
);
impl_from_row_for_tuple!($db, $r;
(0) -> T1;
(1) -> T2;
);
impl_from_row_for_tuple!($db, $r;
(0) -> T1;
(1) -> T2;
(2) -> T3;
);
impl_from_row_for_tuple!($db, $r;
(0) -> T1;
(1) -> T2;
(2) -> T3;
(3) -> T4;
);
impl_from_row_for_tuple!($db, $r;
(0) -> T1;
(1) -> T2;
(2) -> T3;
(3) -> T4;
(4) -> T5;
);
impl_from_row_for_tuple!($db, $r;
(0) -> T1;
(1) -> T2;
(2) -> T3;
(3) -> T4;
(4) -> T5;
(5) -> T6;
);
impl_from_row_for_tuple!($db, $r;
(0) -> T1;
(1) -> T2;
(2) -> T3;
(3) -> T4;
(4) -> T5;
(5) -> T6;
(6) -> T7;
);
impl_from_row_for_tuple!($db, $r;
(0) -> T1;
(1) -> T2;
(2) -> T3;
(3) -> T4;
(4) -> T5;
(5) -> T6;
(6) -> T7;
(7) -> T8;
);
impl_from_row_for_tuple!($db, $r;
(0) -> T1;
(1) -> T2;
(2) -> T3;
(3) -> T4;
(4) -> T5;
(5) -> T6;
(6) -> T7;
(7) -> T8;
(8) -> T9;
);
};
}
#[allow(unused_macros)]
macro_rules! impl_map_row_for_row {
($DB:ident, $R:ident) => {
impl<O: Unpin, F> crate::query::TryMapRow<$DB> for F
where
F: for<'c> FnMut($R<'c>) -> crate::Result<O>,
{
type Output = O;
fn try_map_row(&mut self, row: $R) -> crate::Result<O> {
(self)(row)
}
}
};
}
#[allow(unused_macros)]
macro_rules! impl_column_index_for_row {
($DB:ident) => {
impl crate::row::ColumnIndex<$DB> for usize {
fn resolve<'c>(
self,
row: &<$DB as crate::database::HasRow<'c>>::Row,
) -> crate::Result<usize> {
let len = crate::row::Row::len(row);
if self >= len {
return Err(crate::Error::ColumnIndexOutOfBounds { len, index: self });
}
Ok(self)
}
}
impl crate::row::ColumnIndex<$DB> for &'_ str {
fn resolve<'c>(
self,
row: &<$DB as crate::database::HasRow<'c>>::Row,
) -> crate::Result<usize> {
row.columns
.get(self)
.ok_or_else(|| crate::Error::ColumnNotFound((*self).into()))
.map(|&index| index as usize)
}
}
};
}
#[allow(unused_macros)]
macro_rules! impl_from_row_for_row {
($R:ident) => {
impl<'c> crate::row::FromRow<'c, $R<'c>> for $R<'c> {
#[inline]
fn from_row(row: $R<'c>) -> crate::Result<Self> {
Ok(row)
}
}
};
}