Trait diesel::LoadDsl [−] [src]

pub trait LoadDsl: AsQuery + Sized {
    fn load<U>(self, conn: &Connection) -> QueryResult<Cursor<Self::SqlType, U>> where U: Queriable<Self::SqlType> { ... }
    fn first<U>(self, conn: &Connection) -> QueryResult<U> where U: Queriable<Self::Output::SqlType>, Self: LimitDsl { ... }
    fn get_result<U>(self, conn: &Connection) -> QueryResult<U> where U: Queriable<Self::SqlType> { ... }
    fn get_results<U>(self, conn: &Connection) -> QueryResult<Cursor<Self::SqlType, U>> where U: Queriable<Self::SqlType> { ... }
}

Methods to execute a query given a connection. These are automatically implemented for the various query types.

Provided Methods

fn load<U>(self, conn: &Connection) -> QueryResult<Cursor<Self::SqlType, U>> where U: Queriable<Self::SqlType>

Executes the given query, returning an Iterator over the returned rows.

fn first<U>(self, conn: &Connection) -> QueryResult<U> where U: Queriable<Self::Output::SqlType>, Self: LimitDsl

Attempts to load a single record. Returns Ok(record) if found, and Err(NotFound) if no results are returned. If the query truly is optional, you can call .optional() on the result of this to get a Result<Option<U>>.

fn get_result<U>(self, conn: &Connection) -> QueryResult<U> where U: Queriable<Self::SqlType>

Runs the command, and returns the affected row. Err(NotFound) will be returned if the query affected 0 rows. You can call .optional() on the result of this if the command was optional to get back a Result<Option<U>>

fn get_results<U>(self, conn: &Connection) -> QueryResult<Cursor<Self::SqlType, U>> where U: Queriable<Self::SqlType>

Runs the command, returning an Iterator over the affected rows.

Implementors