Unable to insert into remote table

Question

I have created a dblink (public), and a synonym(synonym1) pointing to a table in the remote database.
When I try to create a form based on the synonym the form creation fails with many errors saying "Synonym Trnslation no longer supported". I have tested the synonym via a dynamic page an it is valid and working.
I then try to refer to the object directly by using owner.table@dblink. This works fine until I try and insert into the remote table. Then I get the error "An unexpected error occurred: ORA-22816: unsupported feature with RETURNING clause (WWV-16016) ". Has anyone solved this. I can only assume that portal can somehow insert data into a remote table via a form. What use is it if it cant???

Answer 1

I am not clear on that Synonym ... but the following note solved the problem:
Subject: How to create a form on a view (and avoid WWV-16016)
Doc ID: Note:155654.1 Type: PROBLEM
Last Revision Date: 19-MAR-2003 Status: PUBLISHED
Problem Description
Portal 3.0.9.X
If you create an updateable view on two tables, with the needed
associated "INSTEAD_OF" trigger to perform the insert or update.
A Form on this view created in Portal returns the following error on
insert or update:
An unexpected error occurred: ORA-22816: unsupported feature with
RETURNING clause (WWV-16016).
Let's take a sample:
CREATE OR REPLACE VIEW V_EMP_DEPT ( EMPNO,
ENAME, JOB, DEPTNO, DNAME,
LOC ) AS select
e.empno
,e.ename
,e.job
,d.deptno
,d.dname
,d.loc
from emp e, dept d
where e.deptno = d.deptno
grant select,insert,update,delete on v_emp_dept to public;
create or replace TRIGGER VEMPDEPT_INSTEAD_OF_TRG
INSTEAD OF UPDATE or INSERT
ON v_emp_dept
REFERENCING OLD AS OLD NEW AS NEW
declare
begin
if updating then
if :new.empno != :old.empno then
raise_application_error(20001,'EMPNO could not be modified');
end if;
if :new.loc != :old.loc then
raise_application_error(20001,'LOC could not be modified');
end if;
if :new.dname != :old.dname then
raise_application_error(20001,'dname could not be modified');
end if;
if :new.ename != :old.ename then
update emp set ename=:new.ename where empno = :old.empno;
end if;
if :new.job != :old.job then
update emp set job=:new.job where empno = :old.empno;
end if;
if :new.deptno != :old.deptno then
update emp set deptno=:new.deptno where empno = :old.empno;
end if;
end if;
if inserting then
-- specify only valid deptumbers
insert into emp(empno,ename,job,deptno) values
(:new.empno,:new.ename,:new.job,:new.deptno);
end if;
end;
- Create a "Forms Based on a Table or View" on this view : 'V_EMP_DEPT'
- In the step 4, choose 'order by dname' in place of 'rowid'
The rest is default
- Run the form
- Push on the button query
- change one of the field and push the update button
You will see the error
Error: An unexpected error occurred: ORA-22816: unsupported feature
with RETURNING clause (WWV-16016)
Explanation
You are running in Bug 1589656. The code generated by Portal is using
RETURN clause for the UPDATE or INSERT SQL call to get the ROWID.
This is not possible on a VIEW created on two (or more) tables.
Solution Description
A possible workaround is to replace the insert button code and update button
code with calls to procedures doing exactly what is done in the trigger.
Assumption is made that the empno column could not be updated.
This implies that the validation options updatable checkbox for the empno column
is unchecked.
In the above example, this gives:
-- procedure to insert data as done in the trigger
create or replace procedure V_EMP_DEPT_INSERT(
p_session in out PORTAL30.wwa_api_module_session
IS
"_block" varchar2(30) := 'DEFAULT';
rec SCOTT.V_EMP_DEPT%ROWTYPE;
begin
rec.EMPNO:=p_session.get_value_as_NUMBER(
p_block_name => "_block",
p_attribute_name => 'A_EMPNO',
p_index => 1
rec.ENAME:=p_session.get_value_as_VARCHAR2(
p_block_name => "_block",
p_attribute_name => 'A_ENAME',
p_index => 1
rec.JOB:=p_session.get_value_as_VARCHAR2(
p_block_name => "_block",
p_attribute_name => 'A_JOB',
p_index => 1
rec.DEPTNO:=p_session.get_value_as_NUMBER(
p_block_name => "_block",
p_attribute_name => 'A_DEPTNO',
p_index => 1
insert into scott.emp(empno,ename,job,deptno)
values (rec.empno,rec.ename,upper(rec.job),rec.deptno);
exception
when others then
rollback;
raise;
end;
-- procedure that update data as done in the trigger
create or replace procedure V_EMP_DEPT_UPDATE(
p_session in out PORTAL30.wwa_api_module_session
IS
"_block" varchar2(30) := 'DEFAULT';
old_rec SCOTT.V_EMP_DEPT%ROWTYPE;
new_rec SCOTT.V_EMP_DEPT%ROWTYPE;
begin
new_rec.EMPNO:=p_session.get_value_as_NUMBER(
p_block_name => "_block",
p_attribute_name => 'A_EMPNO',
p_index => 1
new_rec.ENAME:=p_session.get_value_as_VARCHAR2(
p_block_name => "_block",
p_attribute_name => 'A_ENAME',
p_index => 1
new_rec.JOB:=p_session.get_value_as_VARCHAR2(
p_block_name => "_block",
p_attribute_name => 'A_JOB',
p_index => 1
new_rec.DEPTNO:=p_session.get_value_as_NUMBER(
p_block_name => "_block",
p_attribute_name => 'A_DEPTNO',
p_index => 1
new_rec.LOC:=p_session.get_value_as_NUMBER(
p_block_name => "_block",
p_attribute_name => 'A_LOC',
p_index => 1
select empno, ename, job, deptno, loc
into old_rec.empno, old_rec.ename, old_rec.job,
old_rec.deptno, old_rec.loc from scott.V_EMP_DEPT
where empno = new_rec.empno;
if new_rec.empno != old_rec.empno then
raise_application_error(20001,'EMPNO could not be modified');
end if;
if new_rec.loc != old_rec.loc then
raise_application_error(20001,'LOC could not be modified');
end if;
if new_rec.dname != old_rec.dname then
raise_application_error(20001,'dname could not be modified');
end if;
if new_rec.ename != old_rec.ename then
update scott.emp set ename=new_rec.ename where empno =
old_rec.empno;
end if;
if new_rec.job != old_rec.job then
update scott.emp set job=new_rec.job where empno = old_rec.empno;
end if;
exception
when NO_DATA_FOUND then
raise_application_error(20001,'EMPNO could not be modified');
end;
After creating this two procedures you have to edit the form and replace the
Insert and Update button PLSQL event handling code.
For the insert button: Select Insert in the PL/SQL Button Event Handler window
and replace the original code with the following one::
--- Type your PL/SQL code here...
-- doInsert;--- This is the default handler
--- ...and here, thanks...
V_EMP_DEPT_INSERT( p_session => p_session);
For the update button: Select Update in the PL/SQL Button Event Handler window
and replace the original code with the following one:
--- Type your PL/SQL code here...
-- doUpdate;--- This is the default handler
--- ...and here, thanks...
V_EMP_DEPT_UPDATE( p_session => p_session );
Remarks
1) Don't forget to uncheck the updatable validation option for the empno column or
you may see some errors raised by the update procedure or update the wrong record.
2) If you don't want to write the "instead of trigger", you can simplify
the code above by:
- writing no instead of trigger at all
- write the logic to the underlying tables in PL/SQL trigger of Portal
( here V_EMP_DEPT_UPDATE, V_EMP_DEPT_INSERT)
- Manohar