R83 员工号自动生成与单用户开通后端闭环

server/prisma/migrations/20260504234500_r83_employee_no_default/migration.sql

@@ -0,0 +1,54 @@
+CREATE SEQUENCE "employee_number_seq"
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+DO $$
+DECLARE
+  v_next_value INTEGER;
+BEGIN
+  SELECT COALESCE(MAX(SUBSTRING(employee_no FROM 4)::INTEGER), 0) + 1
+    INTO v_next_value
+    FROM employees
+   WHERE employee_no ~ '^HYD[0-9]{6}$';
+
+  EXECUTE format('ALTER SEQUENCE "employee_number_seq" RESTART WITH %s', v_next_value);
+END;
+$$;
+
+CREATE OR REPLACE FUNCTION generate_employee_number()
+RETURNS TEXT
+LANGUAGE plpgsql
+AS $$
+DECLARE
+  v_seq INTEGER;
+BEGIN
+  v_seq := nextval('"employee_number_seq"');
+  IF v_seq > 999999 THEN
+    RAISE EXCEPTION '员工编号序列已达上限 999999';
+  END IF;
+  RETURN 'HYD' || LPAD(v_seq::TEXT, 6, '0');
+END;
+$$;
+
+ALTER TABLE "employees"
+  ALTER COLUMN "employee_no" SET DEFAULT generate_employee_number();
+
+CREATE OR REPLACE FUNCTION prevent_employee_no_update()
+RETURNS trigger
+LANGUAGE plpgsql
+AS $$
+BEGIN
+  IF OLD.employee_no IS DISTINCT FROM NEW.employee_no THEN
+    RAISE EXCEPTION '禁止修改员工编号：employee_no 是不可变字段';
+  END IF;
+  RETURN NEW;
+END;
+$$;
+
+CREATE TRIGGER prevent_employee_no_update_trigger
+BEFORE UPDATE ON "employees"
+FOR EACH ROW
+EXECUTE FUNCTION prevent_employee_no_update();