Update of varray columns

Question

Hi all,
Can I update a varray column.Oracle version we are using is 9.2.0.8.
In the below given table structure and sample data, in second insert statement, email column is having null values.In the actual table we have around 200 - 300 columns where email value is null, i want update those columns where email is null.Is it possible to update only one column in a varray column.
CREATE TABLE XXEACCESS_IMPL
( REQUEST_ID VARCHAR2(20 BYTE),
STATUS CHAR(1 BYTE),
SYSTEM_IMPL VARCHAR2(50 BYTE),
ART_REQUEST_ID NUMBER,
CALL_DATA WF_PARAMETER_LIST_T,
LAST_UPDATED_DATE DATE DEFAULT sysdate);
CREATE OR REPLACE type SCOTT.WF_PARAMETER_T as object
( NAME VARCHAR2(30), VALUE VARCHAR2(2000),
MEMBER FUNCTION getName return varchar2,
MEMBER FUNCTION getValue return varchar2,
MEMBER PROCEDURE setName (pName in varchar2),
MEMBER PROCEDURE setValue(pValue in varchar2));
CREATE OR REPLACE
type body SCOTT.WF_PARAMETER_T as
MEMBER FUNCTION getName return varchar2 is
begin
return name;
end getName;
MEMBER FUNCTION getValue return varchar2 is
begin
return value;
end getValue;
MEMBER PROCEDURE setName(pName in varchar2) is
begin
name := pName;
end setName;
MEMBER PROCEDURE setValue(pValue in varchar2) is
begin
value := pValue;
end setValue;
end;
Insert into XXEACCESS_IMPL
(REQUEST_ID, STATUS, SYSTEM_IMPL, ART_REQUEST_ID, CALL_DATA, LAST_UPDATED_DATE)
Values ('EA39050', 'Y', 'CONTACT_MANAGEMENT_REQUEST', 27084, wf_parameter_list_t(
wf_parameter_t('EMAIL', '[email protected]'), wf_parameter_t('DOMICILE', 'US')), TO_DATE('05/03/2006 16:45:18', 'MM/DD/YYYY HH24:MI:SS'));
Insert into XXEACCESS_IMPL
(REQUEST_ID, STATUS, SYSTEM_IMPL, ART_REQUEST_ID, CALL_DATA, LAST_UPDATED_DATE)
Values
('EA39045', 'Y', 'CREATE_ACCOUNT', 27089,
wf_parameter_list_t(
wf_parameter_t('EMAIL',''),WF_PARAMETER_T('DOMICILE','US')),
TO_DATE('05/03/2006 17:13:08', 'MM/DD/YYYY HH24:MI:SS'));
Please help me in this regard.
Thanks
Raghu

Answer 1

You can use this statement:
UPDATE xxeaccess_impl x
   SET call_data =
       CAST (MULTISET (SELECT CASE WHEN temp_tab.name = 'EMAIL' AND temp_tab.value IS NULL THEN
wf_parameter_t ('EMAIL', '[email protected]')
ELSE
VALUE (temp_tab)
END CASE
                         FROM TABLE (SELECT call_data
                                       FROM xxeaccess_impl
                                      WHERE x.ROWID = ROWID
                                     ) temp_tab
             AS wf_parameter_list_t
            );But, better way is to use PL/SQL: retrieve the entire varray, update its elements, and then store the changed varray back in the database.
Regards,
Zlatko