Trait InExpression

pub trait InExpression {
    type SqlType: SqlType;

    // Required methods
    fn is_empty(&self) -> bool;
    fn is_array(&self) -> bool;
}

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

A marker trait that identifies query fragments that can be used in IN(...) and NOT IN(...) clauses, (or = ANY (...) clauses on the Postgres backend)

These can be wrapped in In or NotIn query dsl nodes

Required Associated Types

type SqlType: SqlType

The SQL type of the inner values, which should be the same as the left of the IN or NOT IN clause

Required Methods

fn is_empty(&self) -> bool

Returns true if self represents an empty collection Otherwise false is returned.

fn is_array(&self) -> bool

Returns true if the values clause represents bind values and each bind value is a postgres array type

Implementors

impl<ST, I> InExpression for Many<ST, I>

where ST: SqlType,

type SqlType = ST