Enum DefaultExpr 

pub enum DefaultExpr {
    Static(Value),
    Now,
    Uuid,
}

A default-value expression stored on a column definition and applied authoritatively by the engine at insert stage time (before NOT NULL validation) when the column is omitted or explicitly Null. Sequence defaults are handled separately via ColumnFlags::AUTO_INCREMENT.

Variants

Static(Value)

A literal value applied verbatim.

Now

Current timestamp as an ISO-8601 UTC string (Value::Bytes). Resolved at stage time (per-row).

Uuid

A random RFC 4122 UUID (Value::Uuid). Resolved at stage time.

Trait Implementations

impl Clone for DefaultExpr

fn clone(&self) -> DefaultExpr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DefaultExpr

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for DefaultExpr

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for DefaultExpr

fn eq(&self, other: &DefaultExpr) -> 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 Serialize for DefaultExpr

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for DefaultExpr