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172 lines (153 loc) 路 5.83 KB
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use crate::arguments::IntoArguments;
use crate::column::ColumnIndex;
use crate::database::{Database, HasArguments, HasStatement};
use crate::error::Error;
use crate::from_row::FromRow;
use crate::query::Query;
use crate::query_as::QueryAs;
use crate::query_scalar::QueryScalar;
use either::Either;
/// An explicitly prepared statement.
///
/// Statements are prepared and cached by default, per connection. This type allows you to
/// look at that cache in-between the statement being prepared and it being executed. This contains
/// the expected columns to be returned and the expected parameter types (if available).
///
/// Statements can be re-used with any connection and on first-use it will be re-prepared and
/// cached within the connection.
pub trait Statement<'q>: Send + Sync {
type Database: Database;
/// Creates an owned statement from this statement reference. This copies
/// the original SQL text.
fn to_owned(&self) -> <Self::Database as HasStatement<'static>>::Statement;
/// Get the original SQL text used to create this statement.
fn sql(&self) -> &str;
/// Get the expected parameters for this statement.
///
/// The information returned depends on what is available from the driver. SQLite can
/// only tell us the number of parameters. PostgreSQL can give us full type information.
fn parameters(&self) -> Option<Either<&[<Self::Database as Database>::TypeInfo], usize>>;
/// Get the columns expected to be returned by executing this statement.
fn columns(&self) -> &[<Self::Database as Database>::Column];
/// Gets the column information at `index`.
///
/// A string index can be used to access a column by name and a `usize` index
/// can be used to access a column by position.
///
/// # Panics
///
/// Panics if `index` is out of bounds.
/// See [`try_column`](#method.try_column) for a non-panicking version.
fn column<I>(&self, index: I) -> &<Self::Database as Database>::Column
where
I: ColumnIndex<Self>,
{
self.try_column(index).unwrap()
}
/// Gets the column information at `index` or `None` if out of bounds.
fn try_column<I>(&self, index: I) -> Result<&<Self::Database as Database>::Column, Error>
where
I: ColumnIndex<Self>,
{
Ok(&self.columns()[index.index(self)?])
}
fn query(&self) -> Query<'_, Self::Database, <Self::Database as HasArguments<'_>>::Arguments>;
fn query_with<'s, A>(&'s self, arguments: A) -> Query<'s, Self::Database, A>
where
A: IntoArguments<'s, Self::Database>;
fn query_as<O>(
&self,
) -> QueryAs<'_, Self::Database, O, <Self::Database as HasArguments<'_>>::Arguments>
where
O: for<'r> FromRow<'r, <Self::Database as Database>::Row>;
fn query_as_with<'s, O, A>(&'s self, arguments: A) -> QueryAs<'s, Self::Database, O, A>
where
O: for<'r> FromRow<'r, <Self::Database as Database>::Row>,
A: IntoArguments<'s, Self::Database>;
fn query_scalar<O>(
&self,
) -> QueryScalar<'_, Self::Database, O, <Self::Database as HasArguments<'_>>::Arguments>
where
(O,): for<'r> FromRow<'r, <Self::Database as Database>::Row>;
fn query_scalar_with<'s, O, A>(&'s self, arguments: A) -> QueryScalar<'s, Self::Database, O, A>
where
(O,): for<'r> FromRow<'r, <Self::Database as Database>::Row>,
A: IntoArguments<'s, Self::Database>;
}
macro_rules! impl_statement_query {
($A:ty) => {
#[inline]
fn query(&self) -> crate::query::Query<'_, Self::Database, $A> {
crate::query::query_statement(self)
}
#[inline]
fn query_with<'s, A>(&'s self, arguments: A) -> crate::query::Query<'s, Self::Database, A>
where
A: crate::arguments::IntoArguments<'s, Self::Database>,
{
crate::query::query_statement_with(self, arguments)
}
#[inline]
fn query_as<O>(
&self,
) -> crate::query_as::QueryAs<
'_,
Self::Database,
O,
<Self::Database as crate::database::HasArguments<'_>>::Arguments,
>
where
O: for<'r> crate::from_row::FromRow<
'r,
<Self::Database as crate::database::Database>::Row,
>,
{
crate::query_as::query_statement_as(self)
}
#[inline]
fn query_as_with<'s, O, A>(
&'s self,
arguments: A,
) -> crate::query_as::QueryAs<'s, Self::Database, O, A>
where
O: for<'r> crate::from_row::FromRow<
'r,
<Self::Database as crate::database::Database>::Row,
>,
A: crate::arguments::IntoArguments<'s, Self::Database>,
{
crate::query_as::query_statement_as_with(self, arguments)
}
#[inline]
fn query_scalar<O>(
&self,
) -> crate::query_scalar::QueryScalar<
'_,
Self::Database,
O,
<Self::Database as crate::database::HasArguments<'_>>::Arguments,
>
where
(O,): for<'r> crate::from_row::FromRow<
'r,
<Self::Database as crate::database::Database>::Row,
>,
{
crate::query_scalar::query_statement_scalar(self)
}
#[inline]
fn query_scalar_with<'s, O, A>(
&'s self,
arguments: A,
) -> crate::query_scalar::QueryScalar<'s, Self::Database, O, A>
where
(O,): for<'r> crate::from_row::FromRow<
'r,
<Self::Database as crate::database::Database>::Row,
>,
A: crate::arguments::IntoArguments<'s, Self::Database>,
{
crate::query_scalar::query_statement_scalar_with(self, arguments)
}
};
}