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use backend::{Backend, SupportsReturningClause};
use persistable::{Insertable, InsertValues};
use expression::{Expression, SelectableExpression, NonAggregate};
use query_builder::*;
use query_source::Table;
pub struct IncompleteInsertStatement<T> {
records: T,
}
impl<T> IncompleteInsertStatement<T> {
#[doc(hidden)]
pub fn new(records: T) -> Self {
IncompleteInsertStatement {
records: records,
}
}
pub fn into<S>(self, target: S) -> InsertStatement<S, T> where
InsertStatement<S, T>: AsQuery,
{
InsertStatement {
target: target,
records: self.records,
}
}
}
pub struct InsertStatement<T, U> {
target: T,
records: U,
}
impl<T, U, DB> QueryFragment<DB> for InsertStatement<T, U> where
DB: Backend,
T: Table,
T::FromClause: QueryFragment<DB>,
U: Insertable<T, DB> + Copy,
{
fn to_sql(&self, out: &mut DB::QueryBuilder) -> BuildQueryResult {
let values = self.records.values();
out.push_sql("INSERT INTO ");
try!(self.target.from_clause().to_sql(out));
out.push_sql(" (");
try!(values.column_names(out));
out.push_sql(") VALUES ");
try!(values.values_clause(out));
Ok(())
}
}
impl<T, U> AsQuery for InsertStatement<T, U> where
T: Table,
InsertQuery<T::AllColumns, InsertStatement<T, U>>: Query,
{
type SqlType = <Self::Query as Query>::SqlType;
type Query = InsertQuery<T::AllColumns, InsertStatement<T, U>>;
fn as_query(self) -> Self::Query {
InsertQuery {
returning: T::all_columns(),
statement: self,
}
}
}
impl<T, U> InsertStatement<T, U> {
pub fn returning<E>(self, returns: E) -> InsertQuery<E, InsertStatement<T, U>> where
E: Expression,
InsertQuery<E, InsertStatement<T, U>>: Query,
{
InsertQuery {
returning: returns,
statement: self,
}
}
}
#[doc(hidden)]
pub struct InsertQuery<T, U> {
returning: T,
statement: U,
}
impl<T, U, V> Query for InsertQuery<T, InsertStatement<U, V>> where
U: Table,
T: Expression + SelectableExpression<U> + NonAggregate,
{
type SqlType = T::SqlType;
}
impl<T, U, DB> QueryFragment<DB> for InsertQuery<T, U> where
DB: Backend + SupportsReturningClause,
T: QueryFragment<DB>,
U: QueryFragment<DB>,
{
fn to_sql(&self, out: &mut DB::QueryBuilder) -> BuildQueryResult {
try!(self.statement.to_sql(out));
out.push_sql(" RETURNING ");
try!(self.returning.to_sql(out));
Ok(())
}
}