Struct Constraint

pub struct Constraint {
    pub name: String,
    pub expr: String,
}

A constraint in a check constraint

Fields

name: String

The full path to the field.

expr: String

The SQL string that must always evaluate to true.

Implementations

impl Constraint

pub fn new(field_name: &str, invariant_sql: &str) -> Self

Create a new invariant

Trait Implementations

impl Clone for Constraint

fn clone(&self) -> Constraint

Returns a copy of the value.

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

Performs copy-assignment from source.

impl DataCheck for Constraint

fn get_name(&self) -> &str

The name of the specific check

fn get_expression(&self) -> &str

The SQL expression to use for the check

impl Debug for Constraint

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

Formats the value using the given formatter.

impl Default for Constraint

fn default() -> Constraint

Returns the “default value” for a type.

impl PartialEq for Constraint

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Constraint

impl StructuralPartialEq for Constraint