Struct ColumnSnapshot 

pub struct ColumnSnapshot {
    pub name: String,
    pub data_type: DataTypeSnapshot,
    pub nullable: bool,
    pub auto_increment: bool,
    pub unique: bool,
    pub primary_key: bool,
    pub foreign_key: Option<ForeignKeySnapshot>,
    pub default: Option<Value>,
}

Snapshot of a single column definition.

Mirrors the subset of column metadata that is meaningful for migration detection; transient or derivable fields are omitted on purpose.

Fields

name: String

Column name.

data_type: DataTypeSnapshot

Stable encoding of the column data type.

nullable: bool

Whether the column accepts NULL.

auto_increment: bool

Whether the column is auto-incremented on insert.

unique: bool

Whether the column carries a UNIQUE constraint.

primary_key: bool

Whether the column is part of the primary key.

foreign_key: Option<ForeignKeySnapshot>

Foreign key reference, if the column is a foreign key.

default: Option<Value>

Default value applied when no value is supplied on insert.

Trait Implementations

impl Clone for ColumnSnapshot

fn clone(&self) -> ColumnSnapshot

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnSnapshot

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ColumnSnapshot

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Encode for ColumnSnapshot

const ALIGNMENT: PageOffset = 32

The alignment requirement in bytes for the data type.

const SIZE: DataSize = DataSize::Dynamic

The size characteristic of the data type.

fn size(&self) -> MSize

Returns the size in bytes of the encoded data type.

fn encode(&self) -> Cow<'_, [u8]>

Encodes the data type into a vector of bytes.

fn decode(data: Cow<'_, [u8]>) -> MemoryResult<Self>

where Self: Sized,

Decodes the data type from a slice of bytes.

impl PartialEq for ColumnSnapshot

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

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for ColumnSnapshot

impl StructuralPartialEq for ColumnSnapshot