Enum Constraint 

pub enum Constraint {
    Unique {
        columns: Vec<String>,
    },
    Check {
        expression: String,
    },
    ForeignKey {
        columns: Vec<String>,
        references: String,
    },
    Collation {
        column: String,
        name: String,
    },
}

A rule the source enforces that we have no equivalent for.

These are recorded, not applied. QuantyDB has keys, indexes and nullability, and nothing else from this list, so a foreign key or a check constraint cannot come across. That is a limitation rather than a choice, and the reason to carry them here at all is that an importer which does not mention them lets a developer believe their data is still guarded when it is not.

Variants

Unique

unique (a, b), or a column declared unique.

Fields

columns: Vec<String>

Check

check (...), kept as written.

Fields

expression: String

ForeignKey

foreign key (a) references other (b).

Fields

columns: Vec<String>

references: String

Collation

collate nocase on a column, which changes how text compares.

Fields

column: String

name: String

Trait Implementations

impl Clone for Constraint

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Constraint

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

Formats the value using the given formatter.

impl Eq for Constraint

impl PartialEq for Constraint

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Constraint