Struct PgConstraint 

pub struct PgConstraint { /* private fields */ }

PostgreSQL constraint metadata without database introspection.

Implementations

impl PgConstraint

pub const fn new(kind: PgConstraintKind) -> Self

Creates constraint metadata from a kind.

pub fn with_name(self, name: PgConstraintName) -> Self

Adds a constraint name.

pub fn with_columns(self, columns: Vec<PgColumnName>) -> Self

Adds constrained columns.

pub fn with_referenced_table(self, table: PgTableRef) -> Self

Adds referenced table metadata for a foreign key.

pub fn with_expression( self, expression: impl AsRef<str>, ) -> Result<Self, PgConstraintError>

Adds an expression label for check or exclusion metadata without parsing SQL.

Errors

Returns PgConstraintError when the label is empty or contains control characters.

pub const fn with_deferrability(self, deferrability: PgDeferrability) -> Self

Sets the deferrability metadata.

pub const fn kind(&self) -> PgConstraintKind

Returns the constraint kind.

pub const fn name(&self) -> Option<&PgConstraintName>

Returns the optional constraint name.

pub fn columns(&self) -> &[PgColumnName]

Returns the constrained columns.

pub const fn referenced_table(&self) -> Option<&PgTableRef>

Returns the optional referenced table.

pub fn expression(&self) -> Option<&str>

Returns the optional expression label.

pub const fn deferrability(&self) -> PgDeferrability

Returns the deferrability metadata.

Trait Implementations

impl Clone for PgConstraint

fn clone(&self) -> PgConstraint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PgConstraint

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

Formats the value using the given formatter.

impl Display for PgConstraint

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

Formats the value using the given formatter.

impl Hash for PgConstraint

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for PgConstraint

fn cmp(&self, other: &PgConstraint) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for PgConstraint

fn eq(&self, other: &PgConstraint) -> 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 PartialOrd for PgConstraint

fn partial_cmp(&self, other: &PgConstraint) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for PgConstraint

impl StructuralPartialEq for PgConstraint