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use std::marker::PhantomData;
use backend::Backend;
use connection::Connection;
use deserialize::QueryableByName;
use query_builder::{AstPass, QueryFragment, QueryId};
use query_dsl::{LoadQuery, RunQueryDsl};
use result::QueryResult;
use serialize::ToSql;
use sql_types::HasSqlType;
#[derive(Debug, Clone)]
#[must_use = "Queries are only executed when calling `load`, `get_result` or similar."]
/// The return value of `sql_query`.
///
/// Unlike most queries in Diesel, `SqlQuery` loads its data by column name,
/// rather than by index. This means that you cannot deserialize this query into
/// a tuple, and any structs used must implement `QueryableByName`.
///
/// See [`sql_query`](../fn.sql_query.html) for examples.
pub struct SqlQuery {
query: String,
}
impl SqlQuery {
pub(crate) fn new(query: String) -> Self {
SqlQuery { query }
}
/// Bind a value for use with this SQL query.
///
/// # Safety
///
/// This function should be used with care, as Diesel cannot validate that
/// the value is of the right type nor can it validate that you have passed
/// the correct number of parameters.
///
/// # Example
///
/// ```
/// # #[macro_use] extern crate diesel;
/// # include!("../doctest_setup.rs");
/// #
/// # use schema::users;
/// #
/// # #[derive(QueryableByName, Debug, PartialEq)]
/// # #[table_name="users"]
/// # struct User {
/// # id: i32,
/// # name: String,
/// # }
/// #
/// # fn main() {
/// # use diesel::sql_query;
/// # use diesel::sql_types::{Integer, Text};
/// #
/// # let connection = establish_connection();
/// # diesel::insert_into(users::table)
/// # .values(users::name.eq("Jim"))
/// # .execute(&connection).unwrap();
/// # #[cfg(feature = "postgres")]
/// # let users = sql_query("SELECT * FROM users WHERE id > $1 AND name != $2");
/// # #[cfg(not(feature = "postgres"))]
/// let users = sql_query("SELECT * FROM users WHERE id > ? AND name <> ?")
/// # ;
/// # let users = users
/// .bind::<Integer, _>(1)
/// .bind::<Text, _>("Tess")
/// .get_results(&connection);
/// let expected_users = vec![
/// User { id: 3, name: "Jim".into() },
/// ];
/// assert_eq!(Ok(expected_users), users);
/// # }
/// ```
pub fn bind<ST, Value>(self, value: Value) -> UncheckedBind<Self, Value, ST> {
UncheckedBind::new(self, value)
}
}
impl<DB> QueryFragment<DB> for SqlQuery
where
DB: Backend,
{
fn walk_ast(&self, mut out: AstPass<DB>) -> QueryResult<()> {
out.unsafe_to_cache_prepared();
out.push_sql(&self.query);
Ok(())
}
}
impl QueryId for SqlQuery {
type QueryId = ();
const HAS_STATIC_QUERY_ID: bool = false;
}
impl<Conn, T> LoadQuery<Conn, T> for SqlQuery
where
Conn: Connection,
T: QueryableByName<Conn::Backend>,
{
fn internal_load(self, conn: &Conn) -> QueryResult<Vec<T>> {
conn.query_by_name(&self)
}
}
impl<Conn> RunQueryDsl<Conn> for SqlQuery {}
#[derive(Debug, Clone, Copy)]
#[must_use = "Queries are only executed when calling `load`, `get_result` or similar."]
pub struct UncheckedBind<Query, Value, ST> {
query: Query,
value: Value,
_marker: PhantomData<ST>,
}
impl<Query, Value, ST> UncheckedBind<Query, Value, ST> {
pub fn new(query: Query, value: Value) -> Self {
UncheckedBind {
query,
value,
_marker: PhantomData,
}
}
pub fn bind<ST2, Value2>(self, value: Value2) -> UncheckedBind<Self, Value2, ST2> {
UncheckedBind::new(self, value)
}
}
impl<Query, Value, ST> QueryId for UncheckedBind<Query, Value, ST>
where
Query: QueryId,
ST: QueryId,
{
type QueryId = UncheckedBind<Query::QueryId, (), ST::QueryId>;
const HAS_STATIC_QUERY_ID: bool = Query::HAS_STATIC_QUERY_ID && ST::HAS_STATIC_QUERY_ID;
}
impl<Query, Value, ST, DB> QueryFragment<DB> for UncheckedBind<Query, Value, ST>
where
DB: Backend + HasSqlType<ST>,
Query: QueryFragment<DB>,
Value: ToSql<ST, DB>,
{
fn walk_ast(&self, mut out: AstPass<DB>) -> QueryResult<()> {
self.query.walk_ast(out.reborrow())?;
out.push_bind_param_value_only(&self.value)?;
Ok(())
}
}
impl<Conn, Query, Value, ST, T> LoadQuery<Conn, T> for UncheckedBind<Query, Value, ST>
where
Conn: Connection,
T: QueryableByName<Conn::Backend>,
Self: QueryFragment<Conn::Backend> + QueryId,
{
fn internal_load(self, conn: &Conn) -> QueryResult<Vec<T>> {
conn.query_by_name(&self)
}
}
impl<Conn, Query, Value, ST> RunQueryDsl<Conn> for UncheckedBind<Query, Value, ST> {}