Manual row fetch

Hi Gurus
I am trying to create a report and form using the wizard 'Form on a table with report. 2 pages'. However my table has a composite primary key made up of 3 columns.
So I decided to use the wizard to create the report and the form and then overwrite the auto row fetch with my own process.
Therefore I created 3 hidden fields on the report page, one for each of the PK cols. I then wrote a computation that fires after submit to populate the hidden cols. But how do I reference the row values that the user has clicked on in the report ? I have tried using #column_name# notation without any luck.
Can somebody show me where I am going wrong and it maybe that my approach is completely wrong. I could do with a step by step guide on how to achieve this.
Regards
Asif

Hi, Asif,
I recently had problems of this kind and made quite a discussion with Scott Spadafore. See how I resolved this problem:
Automatic Row Processing BUG?
If this doesn't help I'll give you deeper details.

Similar Messages

Custom row-fetch and how to get column values from specific row of report

Hi -- I have a case where a table's primary key has more than 3 columns. My report on the
table has links that send the user to a single-row DML form, but of course the automatic
fetch won't work because 1) I can't set more than 3 item values in the link and 2) the
auto fetch only handles 2 PK columns.
1)
I have written a custom fetch (not sure it's the most elegant, see second question) that is working
for 3 or few PK columns (it references the 1-3 item values set in the link), but when there are
more than 3, I don't know how to get the remaining PK column values for the specific row that was
selected in the report. How can I access that row's report column values? I'll be doing it from the
form page, not the report page. (I think... unless you have another suggestion.)
2)
My custom fetch... I just worked something out on my own, having no idea how this is typically
done. For each dependent item (database column) in the form, I have a source of PL/SQL
function that queries the table for the column in question, using the primary key values. It works
beautifully, though is just a touch slow on my prototype table, which has 21 columns. Is there
a way to manually construct the fetch statement once for the whole form, and have APEX be smart
about what items get what
return values, so that I don't have to write PL/SQL for every item? Because my query data sources
are sometimes in remote databases, I have to write manual fetch and dml anyway. Just would like
to streamline the process.
Thanks,
Carol

HI Andy -- Well, I'd love it if this worked, but I'm unsure how to implement it.
It seems I can't put this process in the results page (the page w/ the link, that has multiple report rows), because the link for the row will completely bypass any after-submit processes, won't it? I've tried this in other conditions; I thought the link went directly to the linked-to page.
And, from the test of your suggestion that I've tried, it's not working in the form that allows a single row edit. I tried putting this manually-created fetch into a before header process, and it seems to do nothing (even with a hard-coded PK value, just to test it out). In addition, I'm not sure how, from this page, the process could identify the correct PK values from the report page, unless it can know something about the row that was selected by clicking on the link. It could work if all the PK columns in my edit form could be set by the report link, but sometimes I have up to 5 pk columns.
Maybe part of the problem is something to do with the source type I have for each of the form items. With my first manual fetch process, they were all pl/sql functions. Not sure what would be appropriate if I can somehow do this with a single (page level?) process.
Maybe I'm making this too hard?
Thanks,
Carol

Problem with type conversion and primary key during row fetch

[Note, this error occurs in Oracle XE, APEX 2.1.0.00.39]
I have been having a problem with Automatic Row Fetch:
ORA-01460: unimplemented or unreasonable conversion requested
So in an effort to resolve this, I created a PL/SQL process with the query below and was able to isolate the same error. The problem seems to come from one of the primary keys being a "number" type (APP_ID). The error occurs on the line:
where u.app_id=:P5_APP_ID
I have tried the following variations on this line in an effort to resolve this, but all generate the same error:
1) where to_char(u.app_id) = :P5_APP_ID
2) where u.app_id = to_number(:P5_APP_ID)
3) where to_char(u.app_id) = to_char(:P5_APP_ID)
I've also tried the laternate syntax "&__." and "#__#", but these don't function in the Source field and show up as syntax errors.
Any suggestions are welcome.
begin
for r in (
select app_name, apptype, appcreator, appurl
from application_users u, application_info i
where u.app_id=:P5_APP_ID
and i.app_id=u.app_id
and u.username=:P5_USERNAME)
loop
begin
:P5_APP_NAME := r.app_name;
:P5_APPURL := r.appurl;
exception
when others then
raise_application_error(-20000,'In Loop Failure',true);
end;
end loop;
exception
when others then
raise_application_error(-20000,'Out of Loop Failure',true);
end;
Thanks in advance,
Barney

I found a prior post referencing a similar issue and it was solved by using the "v(__)" syntax. This did resolve my issue, however, I have a quick follow-on which I'm hoping someone can answer quickly...
Since the "v(__)" syntax won't work for the Automatic Row Fetch (at least to the best of my knowledge), I have to do a manual process. However, the manual query as shown above doesn't actually populate any of the form values through the bind variables. They all remain at their cached values from prior data entry on the form.
Is using the bind variables for assignment incorrect, or is there something that must be done to get the updates to show up in the form (ordering of processes, etc.).
My manual process is running in the Load: Before Header state so I would have expected it to update all of the fields.
Thanks in advance,
Barney

Automatic row fetch and items initialization

Hi team,
I was modifying a page and I came across the following situation:
I had a form with MRU processing and automatic row fetch and I wanted to make SAVE and DELETE buttons conditional basing on a certain flag contained in the row being read.
The flag is read into a hidden item having sequence number lower than any button, however I found out that the condition could not be reliably tested as the value in the session state was coming from a previous visit to the page. Some times the buttons were there, some not, at the beginning it was puzzling.
So, I added a computation based on a SQL query where the hidden flag was computed before the header, basing on the primary key being passed from the calling page and the problem was gone, but for some reason I didn't feel satisfied, it was too cumbersome.
I thought session state items would be assigned beforehand, but for some reason it looked like they were assigned at a later time, even if the automatic fetch process is supposed to run before the header.
Then I noticed an "innocent" option in the fetch process definition saying "set memory cache on Fetch / set memory cache on Display".
In my case was checked the former, but as soon as I checked the latter, I could remove the unnecessary SQL query computation.
So, I started off posting a problem and ended up with the solution...
Bye,
Flavio

Flavio,
Thanks for the testimonial. That feature (new in 1.6) is for the very situation you described. When you create new row fetch processes they will have the "set memory cache on Fetch" option selected by default. For existing processes, the option must be manually changed.
Scott

ORA-01403: no data found Problem when using AUTOMATIC ROW FETCH to populate

ORA-01403: no data found Problem when using AUTOMATIC ROW FETCH to populate a form.
1) Created a FORM on EMP using the wizards. This creates an AUTOMATIC ROW FETCH
TABLE NAME - EMP
Item Containing PRIMARY KEY - P2099_EMPNO
Primary key column - EMPNO
By default the automatic fetch has a ‘Process Error Message’ of ‘Unable to fetch row.’
2) Created a HTML region. Within this region add
text item P2099_FIND_EMPNO
Button GET_EMP to submit
Branch Modified the conditional branch created during button creation to set P2099_EMPNO with &P2099_FIND_EMPNO.
If I then run the page, enter an existing employee number into P2099_EMPNO and press the GET_EMP button the form is populated correctly. But if I enter an employee that does not exist then I get the oracle error ORA-01403: no data found and no form displayed but a message at the top of the page ‘Action Processed’.I was expecting a blank form to be displayed with the message ‘Unable to fetch row.’
I can work around this by making the automated fetch conditional so that it checks the row exists first. Modify the Fetch row from EMP automated fetch so that it is conditional
EXIST (SQL query returns at least one row)
select 'x'
from EMP
where EMPNO = :P2099_EMPNO
But this means that when the employee exists I must be fetching from the DB twice, once for the condition and then again for the actual row fetch.
Rather than the above work around is there something I can change so I don’t get the Oracle error? I’m now wondering if the automatic row fetch is only supposed to be used when linking a report to a form and that I should be writing the fetch process manually. The reason I haven’t at the moment is I’m trying to stick with the automatic wizard generation as much as I can.
Any ideas?
Thanks Pete

Hi Mike,
I've tried doing that but it doesn't seem to make any difference. If I turn debug on it shows below.
0.05: Computation point: AFTER_HEADER
0.05: Processing point: AFTER_HEADER
0.05: ...Process "Fetch Row from EMP": DML_FETCH_ROW (AFTER_HEADER) F|#OWNER#:EMP:P2099_EMPNO:EMPNO
0.05: Show ERROR page...
0.05: Performing rollback...
0.05: Processing point: AFTER_ERROR_HEADER
I don't really wan't the error page, either nothing with the form not being populated or a message at the top of the page.
Thanks Pete

How to use Automatic Row Fetch programmatically ?

Hi
I like to use Automatic Row Fetch (AFR) of APEX to populate data into a DML form page by clicking a button with a defined where_clause, and like to update the record accordingly as we did in Oracle forms execute_query procedure. I prefer Oracle provided facilities, don't want to do it manually. Any help ?....
Hasan Al Mamun

You will probably get a better answer if you ask this in the Apex - Oracle Application Express- forum.
Sorry, I don't have an immediate answer for your question ;(

Automated Row Fetch

I am struggling to get two forms on the same page work as they are suppose to. One of the problems is with Automated Row Fetch. To condense the problem I tried the following (on a test page):
Created a form/table on table A with primary key PK_A
Among other things this creates the automated row fetch for this form and a field P1_PK_A. containing the PK.
Created another form/table on table B with primary key PK_B which creates automated row fetch for B and P1_PK_B
Since I am concentrating on fetch process deleted all buttons and processes except FETCH row for both forms.
Now:
When I pass a value to P1_PK_A in the URL and no value for P1_PK_B it fetches the row in form A fine, same is true the other way around. However if I pass valid keys for both forms in the URL it fails to fetch row for the second form.
Am I missing something or if not how am I to have two forms on a page?

Thanks for the quick response Joe,
I deleted the process created by the wizard and created another data manipulation process with the wizard - which created another autmated row fetch and makes no difference. By creating the fetch and DML manually do you mean that I have to create PL/SQL process to fetch the values for the second form?
Btw how in the world I missed the part that you can't have two automated DML processes on a page I don't know.

Can we use the built-in Row fetch for Multiple reports in a page?

I need to create a page with multiple report regions. Each of it is based on a table. Those tables are different. I somewhat remembered that we can NOT use the built in automatic row fetch process if there are multiple report regions, neither the built in DML process. You have to make your own fetch and insert/update/delete process if you intend to.
Also if I write my own row fetch and update processes, do I have to consider lock mechnism? or just simply write select and insert/update?
Any input is appreciated.

I think I found the answer. Would Scott or other gurus take a look at the thread and confirm it, in case the limitation is not in 2.0?
Re: automatic row fetch
What I am concered about is that the locking mechanism. If I have to write my own process to fetch and insert/update, other than the regular select and insert/update statements, do I have to put commit by myself, or htmldb can handle it automatically? Is there an example for this?
Thanks in advance.

How to get a single row fetched in a form?

Hi,
I would like to make a profile page , where the (currently logged in) user can change his adress, e-mailadress etc.
This page must have only a form with input fields, filled with data from the database that the user can change. A report is not necessary because the user may only see his own data.
I tried already several things, but i get allways a form with no data from the database, with the possibility to create records (sometimes, depending on what i choosed in the wizard, also an update button).
I also changed in the 'Automated Row Fetch' the property WHERE CLAUSE with :P9_ID = 1 and even with ID = 1, but both clauses doesn't make a difference.
(1 is the value of the ID-column in my table) // (:P9_ID is a field on my page, linked to the ID-column in my table) // (ID is the PK and columnname in my table)
Is this possible to make an input form containing existing data (that a user can change), and how?
Thx.

Hi,
Whats the table column which stores user login ID? lets say its APEX_LOGIN_ID then create a page item P1_APEX_LOGIN_ID and put default value to :APP_USER. Now in the ARF process, for "Item containing primary key value" put P1_APEX_LOGIN_ID and "Primary Key Column" to APEX_LOGIN_ID.
Cheers,
Hari

Row fetching, session state, multi-page processing of 1 row - problems

I'm building an application that's updating a couple of tables via an updateable view and an instead-of trigger. That portion of it works OK, EXCEPT for the problems that I'm having with the APEX end.
I've got 3 pages; the first page reads the row in via the automated row fetch and has, say columns 1-20.
Page 2 has, say, columns 20-40 and page 3 has the remainder.
I have the row fetch set up conditionally so that it only executes the first time that page 1 is displayed. All the columns are set as Database Columns.
It seems that if I fill in fields on page 1, move to page 2, and back to page 1, the contents of the fields on page 1 are destroyed unless I set their 'Source used' to 'Only when the current value in session state is null'.
Furthermore, upon update (which is on page 3, via an automated row update), the only columns that get updated are those that exist on page 3. The column values from the other pages no longer exist.
Does navigation to another page not retain the session-state of database-column items?
Am I better off just writing my own processes to perform the updates?
Any other suggestions?
Frank

Hello Frank,
>>I have the row fetch set up conditionally so
that it only executes the first time that page 1 is
displayed …
It seems that if I fill in fields on page 1, moveto page 2, and back to page 1, the contents of the
fields on page 1 are destroyed unless I set their
'Source used' to 'Only when the current value in
session state is null'.
It seems that the first sentence is not consistent
with the second one. The only reason the values are
destroyed, as you call it, is that the ARF is running
again. What condition are you using on your ARF?
In any case, the right way to deal with it is to
change the source used to "Only …", as I understand
you already did.
Hi Arie,
I set an item after the first ARF. I then have the ARF set to execute conditionally based on the presence of that item. (I also display a success message on the ARF, so I know that the ARF is only occurring once). I move to subsequent pages by submitting the current pages.
>>Does navigation to another page not retain the
session-state of database-column items?
Navigating to another page does retain the session state values.
It's depends on what you mean by navigating.
Submitting the page set/update session state.
Redirect without submitting the page will not
set/update the session state.
>>Furthermore, upon update (which is on page 3,
via an automated row update), the only columns that
get updated are those that exist on page 3. The
column values from the other pages no longer
exist.
Automatic DML is working only with the current page
items. You can't use it to insert/update other page
items, even if they are in session state. However, in
your case, it's not the Automatic DML performing the
actual updates, but your triggers. Are your triggers
relying on session state values?
I think this statement 'Automatic DML is working only with the current page
items.' answers my question. My trigger is working on session state values. It's an 'instead-of' trigger, so I was letting the automatic DML perform the 'update' on the view, while allowing the trigger to do the actual update of several tables that the view joins by referring to their :NEW. values in the trigger. Since the DML occurs on my last page, those were the only session state values that my trigger ultimately saw.
>>Am I better off just writing my own processes to
perform the updates?
I believe the correct way is to submit the page and
then branch to the next one. Submitting the page will
save all your items in session state, and allow these
items to be available for page 3 DML.
Regards,
Arie.I'm doing that already - all the values do appear to be in session sate, except only the items that are on the last page actually make it to the automatic DML update, which seems to agree with your previous statement.
I suppose I could write my own process to perform the update, as the values are available in session state.
Thanks,
Frank

Db link tables in processes and row fetch

I have an application I developed in schema A that is referencing tables in schema B. I have been told that these tables need to be moved to another database for which I have created a database link. I know this database link is working because it tests ok and I can pull user names from a user table in an item.
Also, on the first page I have a report that sources from the dblink:
SELECT TRK_CALLS.ID, TRK_CALLS.USER_, TRK_CALLS.ASSIGNED_TO, TRK_CALLS.PROBLEM, TRK_CALLS.SOLUTION, TRK_CALLS.STATUS
FROM TRK_CALLS@DBLINK_IM3
WHERE
( STATUS = 'Open' and :P2_REPORT_SEARCH is null )
or
( regexp_like( USER_ || '#' || ASSIGNED_TO || '#' || PROBLEM || '#' ||
SOLUTION || '#' || STATUS, :P2_REPORT_SEARCH, 'i' ) )
This is working correctly.
I have edit buttons for the rows in the report that redirect to page 6. I get any error unable to fetch row.
In the row source I placed
trk_calls@DBLINK_IM3
I only have one selection as table owner WEBB so this may be part of the problem but I am not sure how to fix this. I tried to create a new row fetch under the the owner GIS which is the right owner but it still diplays WEBB once created. Is this even part of the Solution?
Is there a better way to do this? PL/SQL expression?
I have many other processes that will have insert, apply changes, etc to the tables so if I can get this to work I may be on my way to making the db link work.
Please help me in any way possible.
Thanks,
Kirk

Kirk,
you get this error because it is impossible to use the returning clause, probably because you are using a DB link.
You can cicrumvent this by determing the primary key value in the PL/SQL before doing the insert and then including its value in the insert:
Thanks alot for the info on creating the view. It is working to a certain point.
I am getting a 'ORA-22816: unsupported feature with RETURNING clause' error now. I created the view and referenced the view in all of my pages. Simply put, wherever I had TRK_CALLS in a source or SQL expression I replaced it with TRK_CALLS_VIEW.
The application didn't have the error before and the only thing I changed was this. What could be the problem?
This is the expression that the error is referring to:
declare
l_CALL_ID number;
begin
/* determine CALL ID */
i_call_id := get_call_id; /* some function returning new call id */
insert into webb.TRK_CALLS_VIEW
(+id+, USER_, ASSIGNED_TO, PROBLEM, SOLUTION, STATUS)
values
(+i_call_id+,:P3_USER_, :P3_ASSIGNED_TO, :P3_PROBLEM, :P3_SOLUTION, :P3_STATUS)
good luck, DickDral

JDBC Sender Adapter - Restrict number of rows fetched, Oracle

Hi,
Is it possible to restrict the number of rows fetched by the JDBC Sender adapter at each run? What would the appropriate Select and Update statements be to make sure a limited number of rows are selected and flagged as processed?
We are connecting to a Oracle RDBMS.
//Johan

hi,
have a look at this info:
about oracle and limiting number of rows
http://www.oracle.com/technology/oramag/oracle/06-sep/o56asktom.html
Regards,
michal
<a href="/people/michal.krawczyk2/blog/2005/06/28/xipi-faq-frequently-asked-questions"><b>XI / PI FAQ - Frequently Asked Questions</b></a>

CUSTOM ROW FETCH USING PLSQL BLOCK DOESN'T WORK

Hello,
I'm using Apex 3.0, and I'm trying to use a anonymous block to populate page items instead of automatic row fetch. Apparently the block works fine but the page doesn't display the items with the values that I fetched.
I'm using something like:
Declare
v_test varchar2(10);
begin
select name into v_test from emp where emp_no=:p10_id;
:p10_name:=v_test;
end;
Does anyone have a clue ? The process is defined to run on "OnLoad - After header", but I've tried other options, but the results are the same: P10_name appears blank.
thank you for your help
JAV

But there is a catch.....on the item definition, the "SOURCE USED" must be set to "Only when current value in session is null", otherwise, it doesn't show what you want.
Cheers
JAV

Automatic row fetch based on a select list

db11gxe , apex 4.0 , firefox 24 ,
hi all ,
i want to do automatic row fetch when the value of a select list changes ?
but first i should ofcourse create a tabular form to fetch the data into it , but what i want is ,if i fetch 2 rows then the report contains only two rows , if i fetch 3 , the report contains only 3
, if i fetch nothing , the report has nothing ?
thanks

Assuming all your page items are on separate rows, under your Page Attributes Header and Footer section, add the below function under Header Text:
<script>
function f_toggleNM() {
   // if P2_ATTACHMENT_TYPE value is D, then show row holding P2_CUSTOM_NAME and P2_CUSTOM_MSG. Else hide them
   $f_Show_On_Value_Item_Row('P2_ATTACHMENT_TYPE', [ 'P2_CUSTOM_NAME', 'P2_CUSTOM_MSG' ], 'C');
   // if P2_ATTACHMENT_TYPE value is C, then show row holding P2_DEFAULT_NAME and P2_DEFAULT_MSG. Else hide them
   $f_Show_On_Value_Item_Row('P2_ATTACHMENT_TYPE', [ 'P2_DEFAULT_NAME', 'P2_DEFAULT_MSG' ], 'D');
</script>Under Footer Text, add the below:
<script>
f_toggleNM();
</script>And on the P2_ATTACHMENT_TYPE item, Element tab, HTML Form Element Attributes, add below:
onchange="f_toggleNM();"Hope this helps. Thanks!
JMcG

Call a Automatic Row Fetch from a Dynamic Action

Hi,
can I execute the Automatic Row Fetch from a dynamic action?
I only found this post (Dynamic Actions to call Automatic Row Processing (DML) but the link where the solution is does not work :(
Thanks,
Edited by: Elena.mtc on 09-nov-2012 5:46

Elena.mtc wrote:
I forgot to say, for several reasons, I don't want to submit the page. So that's where I find the complexity in calling the ARf.
Thanks.You cannot fire the ARF because it is designed to run when the page is rendered and it cannot be called as a standalone
Create a dynamic action as follows to fetch the form detials
Action: Execute PL/SQL Code
PL/SQL Code:
begin
select ename, job, mgr, hiredate, sal
    into :P4_ENAME, :P4_JOB, :P4_MGR, :P4_HIREDATE, :P4_SAL
    from emp
   where empno = :P4_EMPNO;
exception
when others then
    null;
end;
Page Items to Submit: P4_EMPNO
Page Items to Return: P4_ENAME,P4_JOB,P4_MGR,P4_HIREDATE,P4_SAL
See this working example: http://apex.oracle.com/pls/apex/f?p=32940:4
Login as test/test
If you want to make it more dynamic you can query the APEX metadata to find the form items on your current page
select * from apex_application_page_db_items
where page_id =:APP_PAGE_ID
and application_id = :APP_ID;

Manual row fetch

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