Enum RelationColumn

pub enum RelationColumn {
    Single(Option<String>),
    Wildcard,
}

Variants

Single(Option<String>)

A single column that may have a name. Unnamed columns cannot be referenced.

Wildcard

Means “and other unmentioned columns”. Does not mean “all columns”.

Implementations

impl RelationColumn

pub fn is_single(&self) -> bool

Returns true if this is a RelationColumn::Single, otherwise false

pub fn as_single_mut(&mut self) -> Option<&mut Option<String>>

Optionally returns mutable references to the inner fields if this is a RelationColumn::Single, otherwise None

pub fn as_single(&self) -> Option<&Option<String>>

Optionally returns references to the inner fields if this is a RelationColumn::Single, otherwise None

pub fn into_single(self) -> Result<Option<String>, RelationColumn>

Returns the inner fields if this is a RelationColumn::Single, otherwise returns back the enum in the Err case of the result

pub fn is_wildcard(&self) -> bool

Returns true if this is a RelationColumn::Wildcard, otherwise false

Trait Implementations

impl Clone for RelationColumn

fn clone(&self) -> RelationColumn

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RelationColumn

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for RelationColumn

fn deserialize<__D>( __deserializer: __D, ) -> Result<RelationColumn, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for RelationColumn

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for RelationColumn

fn eq(&self, other: &RelationColumn) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for RelationColumn

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for RelationColumn

impl StructuralPartialEq for RelationColumn