Enum Fields 

pub enum Fields {
    Value(Box<Selector>),
    Select(Vec<Field>),
}

The foo,bar,* part of statements like SELECT foo,bar.* FROM faz.

Variants

Value(Box<Selector>)

Fields had the VALUE clause and should only return the given selector

This variant should not contain Field::All TODO: Encode the above variant into the type.

Select(Vec<Field>)

Normal fields where an object with the selected fields is expected

Implementations

impl Fields

pub fn walk_revisioned_variant_name( wire_revision: u16, discriminant: u32, ) -> Option<&'static str>

Resolve a wire discriminant at wire_revision to the variant identifier at that revision. Returns None if no such variant exists at that revision.

Generated by the revisioned derive.

pub fn walk_revisioned_variant_table( wire_revision: u16, ) -> &'static [(&'static str, u32)]

Variant name + discriminant pairs at wire_revision. Returns an empty slice if the revision is unknown. Generated by the revisioned derive.

impl Fields

pub const REVISION: u16 = 1u16

The revision number of this type, as declared via #[revisioned(revision = N)].

impl Fields

pub fn read_only(&self) -> bool

Returns true if computing this value can be done on a read only transaction.

pub fn all() -> Self

Create a new * field projection

pub fn has_all_selection(&self) -> bool

Check to see if this field is a * projection

pub fn value_id() -> Self

Create a new VALUE id field projection

pub fn iter_non_all_fields(&self) -> FieldsIter<'_>

Returns an iterator which returns all fields which are not Field::All.

pub fn is_single(&self) -> bool

Check to see if this field is a single VALUE clause

pub fn is_count_all_only(&self) -> bool

Check if the fields are only about counting

Trait Implementations

impl Clone for Fields

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Fields

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

Formats the value using the given formatter.

impl DeserializeRevisioned for Fields

fn deserialize_revisioned<R: Read>(reader: &mut R) -> Result<Self, Error>

Deserializes a new instance of the struct from the specified reader.

impl Eq for Fields

impl From<Fields> for Fields

fn from(v: Fields) -> Self

Converts to this type from the input type.

impl From<Fields> for Fields

fn from(v: Fields) -> Self

Converts to this type from the input type.

impl Hash for Fields

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

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 Fields

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

Equality operator ==.

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

Inequality operator !=.

impl Revisioned for Fields

fn revision() -> u16

Returns the current revision of this type.

fn type_id() -> TypeId

where Self: 'static,

Returns the type id of this type.

impl SerializeRevisioned for Fields

fn serialize_revisioned<W: Write>(&self, writer: &mut W) -> Result<(), Error>

Serializes the struct using the specified writer.

impl SkipCheckRevisioned for Fields

fn skip_check_revisioned<R: Read>(reader: &mut R) -> Result<(), Error>

impl SkipRevisioned for Fields

fn skip_revisioned<R: Read>(reader: &mut R) -> Result<(), Error>

fn skip_revisioned_slice(reader: &mut SliceReader<'_>) -> Result<(), Error>

Consume through bytes backed by SliceReader without allocating a buffer for bulk segments.

impl StructuralPartialEq for Fields

impl ToSql for Fields

fn fmt_sql(&self, f: &mut String, fmt: SqlFormat)

Format the type to a SQL string.

fn to_sql(&self) -> String

Convert the type to a SQL string.

fn to_sql_pretty(&self) -> String

Convert the type to a pretty-printed SQL string with indentation.

impl<V: Visitor> Visit<V> for Fields

fn visit(&self, this: &mut V) -> Result<(), V::Error>

impl<V: MutVisitor> VisitMut<V> for Fields

fn visit_mut(&mut self, this: &mut V) -> Result<(), V::Error>

impl WalkRevisioned for Fields

type Walker<'r, R: BorrowedReader + 'r> = FieldsWalker<'r, R>

Walker produced by walk_revisioned.

fn walk_revisioned<'r, R: BorrowedReader>( reader: &'r mut R, ) -> Result<Self::Walker<'r, R>, Error>

Read the type’s revision-level prefix and return a walker positioned at the start of the body.