Struct CheckConstraint 

pub struct CheckConstraint {
    pub name: Option<String>,
    pub expr: String,
    pub validated: bool,
}

v7.9.19 — composite UNIQUE / PRIMARY KEY constraint persisted on the table schema. The leading column always has a BTree index (created at CREATE TABLE time); INSERT enforcement scans that index for collisions on the full column tuple. v7.39 (read01 round 48) — a CHECK constraint: the SQL name the user gave it (via ADD CONSTRAINT <name> CHECK (...) or the inline CONSTRAINT <name> CHECK (...) form) plus the predicate source. None name = unnamed, in which case pg_constraint synthesises PG’s <table>_<col>_check form. Names are persisted in the constraint-name appendix (FILE_VERSION 60+); older catalogs deserialise with None.

Fields

name: Option<String>

expr: String

The AST Expr’s Display form, re-parsed on every INSERT/UPDATE.

validated: bool

v7.39 (round 652) — false for a constraint added NOT VALID: the rows already in the table were never scanned against it, and pg_constraint.convalidated says so. It does NOT weaken the check on new rows — INSERT and UPDATE enforce it either way, as in PG. VALIDATE CONSTRAINT does the deferred scan and flips it. Persisted by the FILE_VERSION 87 appendix; older catalogs deserialise as true, which is what every constraint they could hold actually was.

Trait Implementations

impl Clone for CheckConstraint

fn clone(&self) -> CheckConstraint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CheckConstraint

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

Formats the value using the given formatter.

impl Eq for CheckConstraint

impl PartialEq for CheckConstraint

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for CheckConstraint