Enum odbc_safe::Return

#[must_use]
pub enum Return<T, E = ()> {
    Success(T),
    Info(T),
    Error(E),
}

Holds result and indicates the overall success or failure of a function.

Variants

Success(T)

The function has been executed successfully. Holds result.

Info(T)

The function has been executed successfully. There have been warnings. Holds result.

Error(E)

An error occured.

Methods

impl<T, E> Return<T, E>

pub fn map<F, U>(self, f: F) -> Return<U, E> where
    F: FnOnce(T) -> U, 

Maps a Return<T,E> to Return<U,E> by applying a function to a contained Success or Info value, leaving an Error value untouched.

pub fn map_error<F, U>(self, f: F) -> Return<T, U> where
    F: FnOnce(E) -> U, 

Maps a Return<T,E> to Result<T,U> by applying a function to a contained Error value, leaving aSuccessor anInfo` value untouched.

pub fn unwrap(self) -> T

Unwraps the result, yielding the content of Success or Info

pub fn success<U>(self) -> Result<T, U> where
    U: From<E>, 

Transforms the Return<T,E> into a Result<T,U>, mapping Success(v) | Info(v) to Ok(v) and Error(err) to Err(err.into()).

Trait Implementations

impl<T: Debug, E: Debug> Debug for Return<T, E>

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl From<SQLRETURN> for Return<()>

fn from(source: SQLRETURN) -> Return<()>

Performs the conversion.

impl<S, E> Diagnostics for Return<S, E> where
    S: Diagnostics,
    E: Diagnostics, 

fn diagnostics(
    &self,
    rec_number: SQLSMALLINT,
    message_text: &mut [SQLCHAR]
) -> ReturnOption<DiagResult>

Returns the current values of multiple fields of a diagnostic record that contains error, warning, and status information.