Struct ChangeMetadata 

#[non_exhaustive]
pub struct ChangeMetadata {
    pub version: i64,
    pub creation_version: Option<i64>,
    pub operation: ChangeOperation,
    pub changed_columns: Option<Bytes>,
    pub context: Option<Bytes>,
}

Metadata from a Change Tracking query result.

Contains the system columns returned by CHANGETABLE(CHANGES ...).

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

version: i64

The version when the row was last changed.

creation_version: Option<i64>

The version when the row was created (inserted). This is None for delete operations.

operation: ChangeOperation

The type of change (Insert, Update, Delete).

changed_columns: Option<Bytes>

Binary mask of changed columns. Use CHANGE_TRACKING_IS_COLUMN_IN_MASK() to interpret.

context: Option<Bytes>

Application-defined change context.

Implementations

impl ChangeMetadata

pub fn new( version: i64, creation_version: Option<i64>, operation: ChangeOperation, changed_columns: Option<Bytes>, context: Option<Bytes>, ) -> Self

Create new change metadata.

pub fn insert(version: i64) -> Self

Create metadata for an insert operation.

pub fn update(version: i64, creation_version: i64) -> Self

Create metadata for an update operation.

pub fn delete(version: i64) -> Self

Create metadata for a delete operation.

Trait Implementations

impl Clone for ChangeMetadata

fn clone(&self) -> ChangeMetadata

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ChangeMetadata

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

Formats the value using the given formatter.