Oracle-visning kan ikke opdateres, råd om i stedet for triggere

Triggeren I STEDET FOR ville se sådan ud (jeg har antaget, at du har en primær nøglekolonne id ):

SQL> CREATE OR REPLACE TRIGGER trg_staff_data_cpt_instead_upd
  2     INSTEAD OF UPDATE ON staff_data_compat
  3     FOR EACH ROW
  4  BEGIN
  5     UPDATE staff_data_compat_t
  6        SET knownas_surname = :new.surname,
  7            first_name = :new.first_name,
  8            middle_name = :new.mid_name
  9      WHERE id = :new.id
 10  END;
 11  /

Trigger created

Bemærk, at nogle kolonner faktisk kan opdateres i den oprindelige visning. Forespørg på all_updatable_columns se (før du opretter triggeren) for at finde ud af:

SQL> CREATE TABLE staff_data_compat_t AS
  2  SELECT object_name knownas_surname,
  3         owner surname,
  4         object_type first_name,
  5         subobject_name middle_name
  6    FROM all_objects;

Table created

SQL> CREATE OR REPLACE VIEW staff_data_compat AS
  2  SELECT
  3    NVL(knownas_surname,surname) as surname,
  4    first_name,
  5    middle_name mid_name,
  6    NULL as ni,
  7    NULL as home_tel_no
  8  FROM staff_data_compat_t;

Visning oprettet

SQL> SELECT * FROM all_updatable_columns WHERE table_name = 'STAFF_DATA_COMPAT';

OWNER  TABLE_NAME         COLUMN_NAME  UPDATABLE INSERTABLE DELETABLE
------ ------------------ ------------ --------- ---------- ---------
VNZ    STAFF_DATA_COMPAT  SURNAME      NO        NO         NO
VNZ    STAFF_DATA_COMPAT  FIRST_NAME   YES       YES        YES
VNZ    STAFF_DATA_COMPAT  MID_NAME     YES       YES        YES
VNZ    STAFF_DATA_COMPAT  NI           NO        NO         NO
VNZ    STAFF_DATA_COMPAT  HOME_TEL_NO  NO        NO         NO

Hvis du kun skal indsætte/opdatere disse kolonner, behøver du ikke en ISTEDEN FOR trigger.