update-pipeline
Update Pipeline
Converts tracked entity changes into database INSERT/UPDATE/DELETE commands during SaveChanges().
Flow
SaveChanges() → DetectChanges() → IDatabase.SaveChanges() → UpdateAdapter creates IUpdateEntry list → CommandBatchPreparer.BatchCommands()
→ ModificationCommand per table row, composed of ColumnModification per column
→ SharedTableEntryMap is used to track entries mapped to the same row
→ Topological sort via Multigraph (FK dependency ordering)
→ Groups into ModificationCommandBatch (respects max batch size)
→ UpdateSqlGenerator generates SQL per batch → BatchExecutor executes all batches in a transaction → StateManager.AcceptAllChanges()
Concurrency
Concurrency tokens → WHERE conditions on UPDATE/DELETE. AffectedCountModificationCommandBatch checks affected rows. Throws DbUpdateConcurrencyException on mismatch.