DevFoundry/.devfoundry/rules/database-sql.md

Database Guidelines (Access, SQLite, SQL Server, Postgres)

1. MS Access (.mdb / .accdb):
   • Use correct date literals (#YYYY-MM-DD#).
   • Escape field names with square brackets (e.g., [Order Date]).
   • Be cautious with concurrent write operations and file locking.
2. Cross-Engine Dialect Awareness:
   • Access: TOP n, IIF(), string concatenation with &
   • SQLite: LIMIT n, IFNULL(), string concatenation with ||
   • SQL Server: TOP (n), ISNULL(), CONCAT()
   • Postgres: LIMIT n, COALESCE(), ||, boolean literals (TRUE/FALSE)
3. Parameterization: Always use parameterized queries regardless of engine.
4. Migrations: Every schema change must include a rollback/backward-compatibility note in the spec.