Struct MigrationEngine 

pub struct MigrationEngine { /* private fields */ }

The migration engine — compares old and new model snapshots to generate migration SQL.

Implementations

impl MigrationEngine

pub fn new(dialect: MigrationDialect) -> Self

pub fn generate( &self, name: &str, current: &[EntityTypeMeta], previous_snapshot: &Option<ModelSnapshot>, ) -> EFResult<Migration>

Generates a migration by diffing the current model against a snapshot.

pub fn create_snapshot( &self, migration_id: &str, entity_types: &[EntityTypeMeta], ) -> ModelSnapshot

Creates a snapshot from current entity type metadata.

impl MigrationEngine

pub async fn ensure_history_table( &self, provider: &dyn IDatabaseProvider, ) -> EFResult<()>

Ensures the migration history table exists.

pub async fn apply( &self, provider: &dyn IDatabaseProvider, migration: &Migration, ) -> EFResult<()>

Applies a migration’s Up SQL against a database provider.

pub async fn revert( &self, provider: &dyn IDatabaseProvider, migration: &Migration, ) -> EFResult<()>

Reverts a migration using its Down SQL.

pub async fn get_applied_migrations( &self, provider: &dyn IDatabaseProvider, ) -> EFResult<Vec<MigrationHistoryEntry>>

Returns migrations already recorded in the database history table.

pub async fn is_applied( &self, provider: &dyn IDatabaseProvider, migration_id: &str, ) -> EFResult<bool>

Returns whether a migration id is already recorded in history.

pub async fn apply_pending( &self, provider: &dyn IDatabaseProvider, migrations: &[Migration], ) -> EFResult<usize>

Applies all pending migrations in order, skipping already-applied ids.

pub async fn revert_last( &self, provider: &dyn IDatabaseProvider, migrations: &[Migration], ) -> EFResult<Option<String>>

Reverts the most recently applied migration from the given list.

pub async fn revert_to_target( &self, provider: &dyn IDatabaseProvider, migrations: &[Migration], target: Option<&str>, ) -> EFResult<Vec<String>>

Reverts all migrations applied strictly after target (exclusive), leaving the database at target’s state. Returns the reverted ids in the order they were reverted (most-recent first).

If target is None, reverts ALL applied migrations. Returns an error if target is not currently applied.

pub fn generate_script( migrations: &[Migration], from: Option<&str>, to: Option<&str>, ) -> EFResult<String>

Generates a combined SQL script transitioning the database from the from migration state to the to migration state.

Semantics (mirroring dotnet ef migrations script):

• from is exclusive: the DB is assumed to already be at from.
• to is inclusive: the script brings the DB up to and including to.
• from = None: start from an empty database (before any migration).
• to = None: end at the latest migration.
• When from precedes to: emits Up SQL for migrations in (from, to].
• When from follows to: emits Down SQL for migrations in (to, from].
• When from == to: emits a no-op comment.

pub async fn ensure_created( &self, provider: &dyn IDatabaseProvider, entity_types: &[EntityTypeMeta], ) -> EFResult<()>

Generates and applies the initial schema for the given entity types. Corresponds to EF Core Database.EnsureCreated(). Does not use the migrations history table (idempotent DDL only).

pub async fn ensure_deleted( &self, provider: &dyn IDatabaseProvider, entity_types: &[EntityTypeMeta], ) -> EFResult<()>

Drops all tables for the given entity types. Corresponds to EF Core Database.EnsureDeleted().

pub async fn apply_seed_data( &self, provider: &dyn IDatabaseProvider, meta: &EntityTypeMeta, rows: &[HashMap<String, DbValue>], ) -> EFResult<()>

Inserts seed data configured via ModelBuilder::has_data.

impl MigrationEngine

pub fn foreign_key_name( table: &str, column: &str, referenced_table: &str, ) -> String

Standard foreign-key constraint name used by Add/DropForeignKey.

pub fn index_name(table: &str, column: &str) -> String

Standard index name used by CreateIndex/DropIndex.

pub fn generate_alter_column_sql( &self, table: &str, column_name: &str, new: &SnapshotColumn, ) -> String