use-pg-constraint 0.1.0

PostgreSQL constraint primitives for RustUse
Documentation 
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# use-pg-constraint

PostgreSQL constraint primitives for RustUse.

This crate provides constraint names, kinds, deferrability labels, constrained columns, referenced table metadata, and expression labels. It does not generate or execute SQL.

## Example

```rust
use use_pg_column::PgColumnName;
use use_pg_constraint::{PgConstraint, PgConstraintKind, PgConstraintName, PgDeferrability, PgInitially};

let constraint = PgConstraint::new(PgConstraintKind::PrimaryKey)
    .with_name(PgConstraintName::new("users_pkey")?)
    .with_columns(vec![PgColumnName::new("id")?])
    .with_deferrability(PgDeferrability::deferrable(PgInitially::Immediate));

assert_eq!(constraint.to_string(), "CONSTRAINT users_pkey PRIMARY KEY");
assert_eq!(constraint.columns().len(), 1);
assert!(constraint.deferrability().is_deferrable());
# Ok::<(), Box<dyn std::error::Error>>(())
```