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#[doc(hidden)]
pub mod joins;
use backend::Backend;
use expression::{Expression, SelectableExpression, NonAggregate};
use query_builder::*;
use types::{FromSqlRow, HasSqlType};
pub use self::joins::JoinTo;
pub trait Queryable<ST, DB> where
DB: Backend + HasSqlType<ST>,
{
type Row: FromSqlRow<ST, DB>;
fn build(row: Self::Row) -> Self;
}
#[doc(hidden)]
pub trait QuerySource {
type FromClause;
type DefaultSelection: SelectableExpression<Self>;
fn from_clause(&self) -> Self::FromClause;
fn default_selection(&self) -> Self::DefaultSelection;
}
pub trait Column: Expression {
type Table: Table;
fn name() -> &'static str;
}
pub trait Table: QuerySource + AsQuery + Sized {
type PrimaryKey: SelectableExpression<Self> + NonAggregate;
type AllColumns: SelectableExpression<Self> + NonAggregate;
fn primary_key(&self) -> Self::PrimaryKey;
fn all_columns() -> Self::AllColumns;
}
pub trait AppearsInFromClause<QS> {
type Count;
}
#[allow(missing_debug_implementations, missing_copy_implementations)]
pub struct Never;
#[allow(missing_debug_implementations, missing_copy_implementations)]
pub struct Succ<T>(T);
pub type Once = Succ<Never>;