Struct diesel::backend::sql_dialect::exists_syntax::AnsiSqlExistsSyntax

pub struct AnsiSqlExistsSyntax;

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.

Indicates that this backend treats EXIST() as function like expression

Trait Implementations

impl Clone for AnsiSqlExistsSyntax

fn clone(&self) -> AnsiSqlExistsSyntax

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for AnsiSqlExistsSyntax

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

Formats the value using the given formatter.

impl<T, DB> QueryFragment<DB, AnsiSqlExistsSyntax> for Exists<T>

where DB: Backend + SqlDialect<ExistsSyntax = AnsiSqlExistsSyntax>, T: QueryFragment<DB>,

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

Walk over this QueryFragment for all passes.

fn to_sql(&self, out: &mut DB::QueryBuilder, backend: &DB) -> QueryResult<()>

Converts this QueryFragment to its SQL representation.

fn collect_binds<'b>( &'b self, out: &mut DB::BindCollector<'b>, metadata_lookup: &mut DB::MetadataLookup, backend: &'b DB ) -> QueryResult<()>

Serializes all bind parameters in this query.

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

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

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

Does walking this AST have any effect?

impl Copy for AnsiSqlExistsSyntax