Trait SQLConstraint 

pub trait SQLConstraint {
    type Table;
    type Kind;
    type Columns;
}

A table constraint described by types, generated by the table macros.

Required Associated Types

type Table

The table the constraint belongs to.

type Kind

The kind: PrimaryKeyK, ForeignKeyK, UniqueK or CheckK.

type Columns

The constrained columns, as a tuple.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl SQLConstraint for NoConstraint

type Table = ()

type Kind = ()

type Columns = ()