Struct ColumnOptionDef

pub struct ColumnOptionDef {
    pub name: Option<Ident>,
    pub option: ColumnOption,
}

An optionally-named ColumnOption: [ CONSTRAINT <name> ] <column-option>.

Note that implementations are substantially more permissive than the ANSI specification on what order column options can be presented in, and whether they are allowed to be named. The specification distinguishes between constraints (NOT NULL, UNIQUE, PRIMARY KEY, and CHECK), which can be named and can appear in any order, and other options (DEFAULT, GENERATED), which cannot be named and must appear in a fixed order. PostgreSQL, however, allows preceding any option with CONSTRAINT <name>, even those that are not really constraints, like NULL and DEFAULT. MSSQL is less permissive, allowing DEFAULT, UNIQUE, PRIMARY KEY and CHECK to be named, but not NULL or NOT NULL constraints (the last of which is in violation of the spec).

For maximum flexibility, we don’t distinguish between constraint and non-constraint options, lumping them all together under the umbrella of “column options,” and we allow any column option to be named.

Fields

name: Option<Ident>

option: ColumnOption

Trait Implementations

impl Clone for ColumnOptionDef

fn clone(&self) -> ColumnOptionDef

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnOptionDef

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

Formats the value using the given formatter.

impl Display for ColumnOptionDef

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

Formats the value using the given formatter.

impl Hash for ColumnOptionDef

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 PartialEq for ColumnOptionDef

fn eq(&self, other: &ColumnOptionDef) -> 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 ColumnOptionDef

impl StructuralPartialEq for ColumnOptionDef