pub fn lower_inf<R: MultirangeOrRangeMaybeNullable + SingleValue, range>(
range: range,
) -> lower_inf<R, range>where
range: AsExpression<R>,
Available on crate feature
postgres_backend
only.Expand description
Returns true if the range’s lower bound is unbounded
§Example
let int = diesel::select(lower_inf::<Range<Integer>, _>(1..5)).get_result::<Option<bool>>(connection)?;
assert_eq!(Some(false), int);
let int = diesel::select(lower_inf::<Range<Integer>, _>(..5)).get_result::<Option<bool>>(connection)?;
assert_eq!(Some(true), int);
let int = diesel::select(lower_inf::<Nullable<Range<Integer>>, _>(None::<std::ops::Range<i32>>)).get_result::<Option<bool>>(connection)?;
assert_eq!(None, int);
let int = diesel::select(lower_inf::<Multirange<Integer>, _>(vec![5..7])).get_result::<Option<bool>>(connection)?;
assert_eq!(Some(false), int);