Struct kubos_telemetry_db::telemetry::columns::star

[+] Show declaration

pub struct star;

[−] Expand description

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[+]

[+] Show hidden undocumented items

fn clone(&self) -> star[−]

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)[−]

Performs copy-assignment from source.

impl Copy for star

impl Debug for star[+]

[+] Show hidden undocumented items

fn fmt(&self, f: &mut Formatter) -> Result[−]

Formats the value using the given formatter.

impl SelectableExpression<table> for star

impl Expression for star

type SqlType = ()

The type that this expression represents in SQL

impl AppearsOnTable<table> for star

impl<DB: Backend> QueryFragment<DB> for star where
    <table as QuerySource>::FromClause: QueryFragment<DB>, [+]

[+] Show hidden undocumented items

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?