Enum TraceEvent 

#[non_exhaustive]
pub enum TraceEvent<'s> {
    Stmt(StmtRef<'s>, &'s str),
    Profile(StmtRef<'s>, Duration),
    Row(StmtRef<'s>),
    Close(ConnRef<'s>),
}

Available on crate feature trace only.

Trace event

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Stmt(StmtRef<'s>, &'s str)

when a prepared statement first begins running and possibly at other times during the execution of the prepared statement, such as at the start of each trigger subprogram

Profile(StmtRef<'s>, Duration)

when the statement finishes

Row(StmtRef<'s>)

whenever a prepared statement generates a single row of result

Close(ConnRef<'s>)

when a database connection closes