Struct nxtnote_savefile_format::schema::block_properties::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 = ()

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(&self, out: AstPass<'_, DB>) -> QueryResult<()>

Walk over this QueryFragment for all passes.

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

Converts this QueryFragment to its SQL representation.

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

Serializes all bind parameters in this query.

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

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

impl AppearsOnTable<table> for star

impl Copy for star

impl SelectableExpression<table> for star