Struct ColumnSchema 

pub struct ColumnSchema {
    pub name: String,
    pub ty: DataType,
    pub nullable: bool,
    pub default: Option<Value>,
    pub runtime_default: Option<String>,
    pub auto_increment: bool,
}

Fields

name: String

ty: DataType

nullable: bool

default: Option<Value>

Optional DEFAULT value, frozen at CREATE TABLE time. None means “no default” (so omitted columns become NULL, or error out when the column is NOT NULL). Literal defaults take this path.

runtime_default: Option<String>

v7.9.21 — for DEFAULT expressions that need INSERT-time evaluation (e.g. DEFAULT now(), DEFAULT CURRENT_TIMESTAMP), the Display form of the expression. The engine re-parses it on each INSERT default-fill, evaluates against an empty row context, and coerces to the column type. mailrs G4. Persisted in catalog FILE_VERSION 15+; older catalogs deserialise with None.

auto_increment: bool

MySQL-style AUTO_INCREMENT. When set, an INSERT that leaves this column unbound (or sets it to NULL) gets the next integer computed from the column’s current max + 1.

Implementations

impl ColumnSchema

pub fn new( name: impl Into<String>, ty: DataType, nullable: bool, ) -> ColumnSchema

pub fn with_default(self, default: Value) -> ColumnSchema

Builder-style helper to attach a default value to an otherwise plain column schema. Used by the engine when CREATE TABLE specifies column TYPE DEFAULT <expr>.

pub fn with_runtime_default(self, expr: impl Into<String>) -> ColumnSchema

v7.9.21 — builder for runtime-evaluated defaults (DEFAULT now(), DEFAULT CURRENT_TIMESTAMP, …). expr is the Expr’s Display form, re-parsed by the engine at each INSERT.

pub const fn with_auto_increment(self) -> ColumnSchema

Builder-style helper to mark a column as AUTO_INCREMENT.

Trait Implementations

impl Clone for ColumnSchema

fn clone(&self) -> ColumnSchema

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnSchema

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

Formats the value using the given formatter.

impl PartialEq for ColumnSchema

fn eq(&self, other: &ColumnSchema) -> 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 StructuralPartialEq for ColumnSchema