Struct backend::schema::plantings::columns::star

pub struct star;

Represents table_name.*, which is sometimes needed for efficient count queries. It cannot be used in place of all_columns, and has a SqlType of () to prevent it being used that way

Trait Implementations

impl Clone for star

fn clone(&self) -> star

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for star

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

Formats the value using the given formatter.

impl Expression for star

type SqlType = NotSelectable

The type that this expression represents in SQL

impl<DB: Backend> QueryFragment<DB> for star

where <table as QuerySource>::FromClause: QueryFragment<DB>,

fn walk_ast<'b>( &'b self, __diesel_internal_out: AstPass<'_, 'b, DB>, ) -> QueryResult<()>

Walk over this QueryFragment for all passes.

fn to_sql( &self, out: &mut <DB as Backend>::QueryBuilder, backend: &DB, ) -> Result<(), Error>

Converts this QueryFragment to its SQL representation.

fn collect_binds<'b>( &'b self, out: &mut <DB as HasBindCollector<'b>>::BindCollector, metadata_lookup: &mut <DB as TypeMetadata>::MetadataLookup, backend: &'b DB, ) -> Result<(), Error>

Serializes all bind parameters in this query.

fn is_safe_to_cache_prepared(&self, backend: &DB) -> Result<bool, Error>

Is this query safe to store in the prepared statement cache?

fn is_noop(&self, backend: &DB) -> Result<bool, Error>

Does walking this AST have any effect?

impl QueryId for star

type QueryId = star

A type which uniquely represents Self in a SQL query.

const HAS_STATIC_QUERY_ID: bool = true

Can the SQL generated by Self be uniquely identified by its type?

fn query_id() -> Option<TypeId>

Returns the type id of Self::QueryId if Self::HAS_STATIC_QUERY_ID. Returns None otherwise.

impl<__GB> ValidGrouping<__GB> for star

where (id, plant_id, x, y, size_x, size_y, rotation, add_date, remove_date, seed_id, is_area, notes, created_at, modified_at, created_by, modified_by, layer_id, height): ValidGrouping<__GB>,

type IsAggregate = <(id, plant_id, x, y, size_x, size_y, rotation, add_date, remove_date, seed_id, is_area, notes, created_at, modified_at, created_by, modified_by, layer_id, height) as ValidGrouping<__GB>>::IsAggregate

Is this expression aggregate?

impl AppearsOnTable<table> for star

impl Copy for star

impl SelectableExpression<table> for star