Enum TableConstraint 

#[non_exhaustive]
pub enum TableConstraint {
    AssumedPrimaryKey {
        columns: Vec<String>,
    },
    AssumedUnique {
        columns: Vec<String>,
    },
}

A table-level constraint.

Hyper accepts only the assumed constraint forms on CREATE TABLE. Real PRIMARY KEY, UNIQUE, and FOREIGN KEY clauses are rejected with Index support is disabled, and CHECK with check constraints not implemented yet, so they can never appear on a Hyper table in the first place. Assumed constraints are declarations the optimizer trusts but the engine does not enforce — inserting a duplicate key succeeds.

Hyper also rejects CONSTRAINT <name> … (named constraints not implemented yet), so constraints carry no user-chosen name; the engine derives one from the table and column names.

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.

AssumedPrimaryKey

ASSUMED PRIMARY KEY (cols…). Every listed column must be NOT NULL.

Fields

columns: Vec<String>

Key columns, in declaration order.

AssumedUnique

ASSUMED UNIQUE (cols…).

Fields

columns: Vec<String>

Key columns, in declaration order.

Implementations

impl TableConstraint

pub fn columns(&self) -> &[String]

Returns the columns the constraint covers, in declaration order.

Trait Implementations

impl Clone for TableConstraint

fn clone(&self) -> TableConstraint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TableConstraint

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

Formats the value using the given formatter.

impl Eq for TableConstraint

impl PartialEq for TableConstraint

fn eq(&self, other: &TableConstraint) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for TableConstraint