Struct MigrationStatement 

pub struct MigrationStatement<'a> { /* private fields */ }

A migration step pairing a DDL Statement with the Schema it applies against.

Each MigrationStatement carries a snapshot of the schema at the point where the statement should be serialized. This is necessary because rename and recreation operations modify the schema as they go.

Implementations

impl<'a> MigrationStatement<'a>

pub fn from_diff( schema_diff: &'a SchemaDiff<'a>, capability: &Capability, ) -> Vec<Self>

Generates migration statements from a SchemaDiff.

Walks the diff’s type, table, column, and index changes and produces the corresponding DDL statements. Type changes (CREATE TYPE, ALTER TYPE) are emitted before table changes. On databases that lack ALTER COLUMN support (e.g. SQLite), column type changes trigger a full table recreation sequence.

pub fn statement(&self) -> &Statement

Returns the DDL statement for this migration step.

pub fn schema(&self) -> &Schema

Returns the schema snapshot this statement should be serialized against.