Enum SpannerReplication 

pub enum SpannerReplication {
    Full,
    Incremental {
        column: String,
        initial_value: Value,
    },
}

How the source replicates rows across runs.

Serializes as { type: full } or { type: incremental, column: "...", initial_value: ... }.

Variants

Full

Every run fetches the full result set (default).

Incremental

Only rows whose column is strictly greater than the stored bookmark (or initial_value on the first run) are emitted.

The bookmark is applied two ways: if the query contains the named parameter @bookmark, it is bound so the server filters (efficient); the source also filters client-side as a correctness backstop. The new maximum of column is persisted on the final page.

Spanner does not implicitly coerce parameter types: a string bookmark compared against a TIMESTAMP column needs an explicit cast in the query, e.g. WHERE updated_at > TIMESTAMP(@bookmark).

Fields

column: String

Column whose value is the replication cursor (e.g. updated_at).

initial_value: Value

Lower bound used on the first run, before any bookmark is stored.

Trait Implementations

impl Clone for SpannerReplication

fn clone(&self) -> SpannerReplication

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SpannerReplication

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

Formats the value using the given formatter.

impl Default for SpannerReplication

fn default() -> SpannerReplication

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for SpannerReplication

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl JsonSchema for SpannerReplication

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

impl PartialEq for SpannerReplication

fn eq(&self, other: &SpannerReplication) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for SpannerReplication

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 SpannerReplication