Crate use_db_constraint 

use-db-constraint

Constraint references, kinds, metadata, check labels, status, and deferrability.

This crate is part of the use-database facade workspace. It provides small, engine-neutral vocabulary types and metadata containers. It does not connect to databases, execute queries, run migrations, parse SQL, or model engine-specific behavior.

Example

use use_db_constraint::CheckExpressionLabel;

let label = CheckExpressionLabel::new("positive balance").expect("valid label");
assert_eq!(label.as_str(), "positive balance");

Constraint metadata primitives for RustUse.

Structs

CheckExpressionLabel

A check expression label, not an executable expression.

ConstraintMetadata

Constraint metadata.

ConstraintRef

Constraint reference metadata.

Enums

ConstraintError

Error returned by constraint metadata constructors.

ConstraintKind

Broad constraint kind.

ConstraintStatus

Constraint status metadata.

Deferrability

Deferrability metadata.