Saving session state in database table rather in websever for Ordering App

Hi all,
Ours is a ordering application (telecomm) domain.
Currently, we are storing user sessions data (Order shopping cart session data) in middle tier (iPlanet web server) which inturn consumes lot of memory resources.
Shopping cart could be in MBs if order is a huge business order.
So in order to not to overtax web server (middle tier), we are thinking of storing session data directly in a database table to relieve the overhead on web server and make use of database for storage.
I read that APEX (html db) is already using this "single metadata table" approach for session data management. But we are not using HTML DB to really look into.
Can some one advise how to go about storing "user session data" directly in a "database table" for both storage and retrieval purposes instead of storing it in "webserver".
How does this "metadata table" structure looks like. Is it more generic ?
Really appreciate your time and help/suggestions.

Joel,
Thanks for your response. sorry, i meant to say that "the current application does not use APEX but will look into it".
To build this is an utterly non-trivial exercise. Oh - it may not be so hard to save session state to a table when you POST a page. But you may want to reference this in many places, and it's a question of can you change all of these references to indirect references from session state in your application.In order to free up the load on webserver, we want to maintain session management in database. Could you please explain the above little more :
How do we maintain the "user session" with "database table" ?
Do we need to store "session data" at java object level or by page in database table ? How does the structure of this "metadata table" looks like.
Thanks for your time.

Similar Messages

Saving session state on authentication

Hey all...
In all my applications that interact with each other, I am running an application-level process on authentication which loads two preferences into applicaton-level items. I am seeing different results when jumping into different applications even though the executing code is the exact same in all applications, a stored procedure in the database. Here is a simplistic example.
When application A calls a page in application B, an "on authentication" application-level process of application B reads two preferences and appropriately populates them into two application-level items of application B. When application A (or B for that matter) calls application C, the same-coded application process in application C attempts to populate two application-level items, but one of them is not being populated.
It appears that the problem lies only with application C because regardless of whether I come from application A or application B, the same problem happens.
When I go from application A to application B in debug mode, I see the following in reference to this problem:
0.05: Computation point: ON_NEW_INSTANCE
0.05: ...New Session = True
0.05: Processing point: AFTER_AUTHENTICATION
0.05: ...Process "Setup Seed Data": PLSQL (AFTER_AUTHENTICATION)
1.11: ...Session State: Save Item "ORIGINAL_APP_ID" newValue="104" "escape_on_input="Y"
1.11: ...Session State: Save Item "ORIGINAL_PAGE_ID" newValue="7" "escape_on_input="Y"
When I go from either application A or application B to application C, I see the same debug messages except for an additional line that doesn't make sense to me. Following is an example:
0.05: Computation point: ON_NEW_INSTANCE
0.05: ...New Session = True
0.05: Processing point: AFTER_AUTHENTICATION
0.05: ...Process "Setup Seed Data": PLSQL (AFTER_AUTHENTICATION)
1.11: ...Session State: Save Item "ORIGINAL_APP_ID" newValue="104" "escape_on_input="Y"
1.11: ...Session State: Save Item "ORIGINAL_PAGE_ID" newValue="7" "escape_on_input="Y"
1.11: ...Session State: Saved Item "ORIGINAL_APP_ID" New Value=""
In all three applications, the exact same code is being run which determines if the preferences "is not null", and if so, sets the two preferences in the "current" application. I'm happy to show you the code of my stored procedure that does this if you like.
The only thread I've seen in the forum that looks similar is the following:
Re: Session state issues
I've followed its suggestion of deleting and recreating the application-level item, but that did not solve my problem.
I'm confused as to why the new line indicating "Saved Item" is showing up in the application C. Is there documentation available to explain the difference between "Save Item" and "Saved Item" when running a page in debug mode?
Shane.

Here are the different componets that are in play and some notes that may help understand the situation:
- the failure happened when the two application-level processes below were just one process. works fine when they are split up.
- the trick of using the SESSION as the USER_ID is because I want the preference to only be good for the session, not everytime the user logs in. ( i learned this trick from the ApEx forum! )
- the stored procedure is in a package owned by a separate schema than the built-in ApEx user.
On-Authentication Application-Level process with Sequence 10:
begin
:person_id := iv_portal.iv_emp_pkg.get_person_id ( v('USER') );
apex_util.set_session_state ( 'PERSON_ID', :person_id );
:core_app_id := iv_htmldb.iv_gen_pkg.get_core_app_id;
apex_util.set_session_state ( 'CORE_APP_ID', :core_app_id );
:user_vax_id :=
substr ( iv_portal.iv_emp_pkg.get_vaxsub_id ( :person_id ), 1, 6 );
apex_util.set_session_state ( 'USER_VAX_ID', :user_vax_id );
:user_sub_id :=
substr ( iv_portal.iv_emp_pkg.get_vaxsub_id ( :person_id ), 7, 1 );
apex_util.set_session_state ( 'USER_SUB_ID', :user_sub_id );
:proxy_person_id := apex_application.fetch_app_item
( 'PROXY_PERSON_ID', :original_app_id );
apex_util.set_session_state ( 'PROXY_PERSON_ID', :proxy_person_id );
end;
On-Authentication Application-Level process with Sequence 15:
declare
l_username varchar2(50) := v('SESSION');
begin
iv_htmldb.iv_gen_pkg.setup_homepage_preferences ( l_username );
end;
SETUP_HOMEPAGE_PREFERENCES Stored Procedure
procedure setup_homepage_preferences ( l_username in varchar2 ) is
l_app_id varchar2(5) := v('APP_ID');
l_page_id varchar2(5) := v('APP_PAGE_ID');
l_pref_app_id varchar2(5) := null;
l_pref_page_id varchar2(5) := null;
begin
-- clean up old sessions
-- cannot do this however due to lack of access to the ApEx tables.
delete from flows_020200.wwv_flow_preferences$ p
where user_id != v('SESSION' )
and user_id in ( select to_char ( id )
from flows_020200.wwv_flow_sessions$ s
where s.cookie = v('USER')
and s.last_changed < sysdate - ( 0.5 ) );
commit;
if apex_util.get_preference ( 'ORIGINAL_APP_ID', l_username ) is null
then -- then set the preference to the current application and page.
apex_application.debug ( 'setting the ORIGINAL application items.' );
apex_util.set_preference ( 'ORIGINAL_APP_ID', l_app_id,
l_username );
apex_util.set_preference ( 'ORIGINAL_PAGE_ID', l_page_id,
l_username );
else null;
end if;
-- set the application level items to the preference values
l_pref_app_id := apex_util.get_preference ( 'ORIGINAL_APP_ID', l_username );
l_pref_page_id := apex_util.get_preference ( 'ORIGINAL_PAGE_ID', l_username );
apex_application.debug ( 'about to set ORIGINAL APP ID to ' || l_pref_app_id );
apex_util.set_session_state ( 'ORIGINAL_APP_ID', l_pref_app_id );
apex_application.debug ( 'just set ORIGINAL APP ID to ' ||
apex_util.get_session_state ( 'ORIGINAL_APP_ID' ) );
apex_application.debug ( 'about to set ORIGINAL PAGE ID to ' || l_pref_page_id );
apex_util.set_session_state ( 'ORIGINAL_PAGE_ID', l_pref_page_id );
apex_application.debug ( 'just set ORIGINAL PAGE ID to ' ||
apex_util.get_session_state ( 'ORIGINAL_PAGE_ID' ) );
end setup_homepage_preferences;
Shane.

Saving session state

Hi Everyone!
We are looking for an easy-to-use solution for saving the session state in whole.
(We are aware that it is possible to save the sesion state for a single item.)
Our goal is to get a single commando which restores an whole session to another session. We would like to be able to save a session, purge the session (because of old age) and restore it's session state again to a new session.
any ideas?

Hi,
I was thinking that a pointer to the Session object could be stored in a database on the initial loginAre you by any chance referring to the pointer similar to the one that is used in C? If so I guess it is not available in java.
One possible solution where you can persist data across sessions is by the use of stateful session beans. Also you could experiment with the different scopes of the object for achieving your goal.
I hope this helps you. In case I have missed out something please do post again.
Cheers
Giri :-)
Creator Team

Saving session state during pagination

See
http://htmldb.oracle.com/pls/otn/f?p=24317:152
I hacked into the PPR function to save the checkbox value into session state during pagination.
Is there a way to do something similar for checkboxes in the report itself rendered using htmldb_item.checkbox()?
Or is this an ill-advised effort?
[The UI requirement here is clear...I have a bunch of items over many pages and I want to select them using checkboxes and have the selections remembered as I paginate back and forth.
If you use Yahoo Mail, Compose a new message, click on the Insert Addresses link and it pops up a window with all your contacts, you can select them using checkboxes and go to the Next/Previous page and it remembers the selections]
Thanks

See
http://htmldb.oracle.com/pls/otn/f?p=24317:152
Click on the Create/Reset collection button to initialize your own private collection to play with.
The checkboxes are remembered as you paginate thru the resultset. Basically, the state of the checkboxes is saved into session state using htmldb_Get before calling the PPR function to get the next/previous rows.
Carl, let me know what you think of the approach. Is it a viable approach? Any caveats?
[Unfortunately, I had to to make a copy of the builtin html_PPR_Report_Page function to make the above modification in it, didnt see a way to avoid it]
Thanks

Saving output in a database table

Hi all,
We are using EBS 11i.10.2.
I would like to save the XMLP's output in one of the DB tables (in a blob column).
How can I do it?
Is there any delivery manager API that I can use? and how should I use it?
Thanks in advance,

You asked this same question a couple of months ago: http://forums.ni.com/t5/LabVIEW/Reading-Data-From-text-File/m-p/1756390#M612805
Well, you can use the Read Text file to read the file, and then just extract the lines... Ben64 showed you a method to use regular expressions. That's one way.
For Excel you can use the Report Generation Toolkit, or you can code it yourself using ActiveX. There's an example that ships with LabVIEW on writing a table to Excel.
For database operations you can use the Database Toolkit, or you can try to use LabSQL.

Are the database tables stored in a sorted order?

Hi-
Are the records in a databse table stored in a sorted order based on key fields??
Thanks.
Ramesh.

A,
Unfortunately, this is not a clearly or fully explained concept in the BC400 class.
As stated in the course text, the ITAB will have the "order" of the DB table.
This may or may not be in actual key order. It depends on whether or not the primary key index is ALWAYS kept up to date / ordered by your DBAs.
This is rarely done as it is very "expensive" to the system... vitually impossible to be truthful.
Because of this, you can never GUARANTEE in a Production system that all records are stored in a primary key order. To guarantee ordering, you must FORCE the system to order the result set through:
ORDER BY
or
SORT after the database retrieval is completed and the result set is returned to the App server

Appending database tables to a form for reference

Hi Guys,
I would like to create a form that refers to database tables (not big). I would like to embed these tables in my form so that each form can be referenced directly.
Can someone point me to any tutorials explaining this or point me to an example?
Thanks
Albert

I don't think that's the sort of thing PDFGenerator would do. What
software are you working with now, or are you looking for product
recommendations?
Aandi Inston

Saving sessions in the database...

Hi there, I'm trying to save a session object ( not a J2EE session but a custom one ) in an Oracle database. I save the session in a table with a BLOB column and some other varchar columns... Whenever I want to write a blob, the application freezes... When I want to read a file, it's ok... Anyone knows of this problem? Here is the code of my write method:
private void writeSession(CapSession pSession) throws Exception
    static final String writeObjSQL      = "BEGIN " +
                                         " INSERT INTO intranet_sessions(session_id, session_last_access, session_timeout, session_value) " +
                                         " VALUES (?, ?, ?, empty_blob()) " +
                                         " RETURN session_value INTO ?; " +
                                         "END;";
    CallableStatement stmt = conn.prepareCall(writeObjSQL);
    stmt.setString(1, pSession.getSessionId() + pSession.getPassword());
    stmt.setLong(2, pSession.getLastAccess());
    stmt.setLong(3, pSession.getTimeout());
    stmt.registerOutParameter(4, java.sql.Types.BLOB);
    stmt.executeUpdate();
    BLOB blob = (BLOB) stmt.getBlob(4);
    OutputStream os = blob.getBinaryOutputStream();
    ObjectOutputStream oop = new ObjectOutputStream(os);
    oop.writeObject(pSession);
    oop.flush();
    oop.close();
    os.close();
    stmt.close();
    conn.commit();
}Thanks!

Try this
conn.setAutoCommit(false);
PreparedStatement pstmtIns = conn.prepareStatement
               ("INSERT INTO intranet_sessions" +
                    "(session_id, session_last_access, session_timeout, session_value) " +
" VALUES (?, ?, ?, empty_blob()) ");
pstmt.setString(1, pSession.getSessionId() + pSession.getPassword());
pstmt.setLong(2, pSession.getLastAccess());
pstmt.setLong(3, pSession.getTimeout());
pstmt.execute();
PreparedStatement pstmtSel = conn.prepareStatement
               ("select session_value from intranet_sessions where session_id = ? for update");
pstmtSel.setString(1, pSession.getSessionId() + pSession.getPassword());
ResultSet rs = pstmtSel.executeQuery();
while(rs.next())
     BLOB blob = (BLOB) rs.getBlob(1);
     OutputStream os = blob.getBinaryOutputStream();
     ObjectOutputStream oop = new ObjectOutputStream(os);
     ObjectOutputStream oop = new ObjectOutputStream(os);
     oop.writeObject(pSession);
oop.flush();
}

Database Table or T-Code for Substitutes

Hi,
Can anybody help me on the following issue:
in workflow, one user A is receiving email notifications for the workflow. however, we checked and found that he is not authorised for the workflow approvals and nowhere in application he has been defined for workflow approver.
after analysis, we found that user A is receiving emails becaoz somebody has maintained him as his substitute.
I would like to know is there any T-code where i can check who is substitute to whom or the table name where these entries are maintained. i checked that structure HRWHSUBST is being used and in use by program SAPLRHW2. can somebody help me on this.
i want to know who has defined User A as his substitute.
Regards
Sandy

Hi,
You can use function module u201CRH_SUBSTITUTES_GETu201D to get the substitution profiles for a user ID.

Webdynpro abap-method for saving updated values in new database table

Hi Experts,
I am creating an ALV application in weddynpro abap where i have given update button to update fields & save button to save values in mastertable,but whenever i am updating & saving ,it will overwrit previous values. For this,I need to create a separate method to save the updated values of the fields in a new database table.
Looking forward for solutions.
Thank You!

becuase of the below statement u r getting the error
insert into ZTAB_CS_ISSSAL values Item_Dates.
u declared the field Item_Dates as Stru_Issuesal-DATES
and u were trying to inesrting the record in the table ZTAB_CS_ISSSAL with the field Item_Dates
the error is related to the compatible.
so declare work area for updating the table should be of type ZTAB_CS_ISSSAL.

Corrupt Session State? - Apex form posts text value as Null

Recently I've discovered an issue with our Apex installation in which any value chosen as a source for a text field ends up being posted as a null to the database.
We are running APEX version 3.2 within an Oracle 10.2.0.4 database using the Oracle HTTP Server from the 10g companion disk.
At first glance, everything appears to function as expected; I have created a simple table called "oracle_sr" with 2 columns both not null:
SQL> desc capacity.oracle_sr
Name Null? Type
ORACLE_SR_ID NOT NULL NUMBER
TIMESTAMP NOT NULL DATE
Within APEX the form wizard was used to create a form on this table.
After executing the pages and entering a value for the timestamp field I can create records without issue.
The issue arises when I choose a source value for the timestamp field.
Any of the source options result in the same error (including a static value) so I will focus on the SQL Query for the source as:
select sysdate from dual;
This should substitute the system date within the timestamp text field when the page is executed.
As expected, the value appears in the text box but when I submit the form to create the record I receive the error:
ORA-01400: cannot insert NULL into ("CAPACITY"."ORACLE_SR"."TIMESTAMP")
I have been working with APEX for quite some time and have successfully used this technique in many applications but just started to see this error over the past few days. What is particularly odd about this message is that default "not null" validations created by the form wizard sees the timestamp filed as having a value. The session state information included below is reporting a value yet the database is throwing the ORA-01400.
Has anyone experienced a similar issue? I've spent a fair amount of time trying to research this issue but cannot seem to find any similar posts.
I have included the debug output from my test page, from what I can see, there does seem to be a value associated with the timestamp filed:
0.00: A C C E P T: Request="CREATE"
0.00: Metadata: Fetch application definition and shortcuts
0.00: NLS: wwv_flow.g_flow_language_derived_from=FLOW_PRIMARY_LANGUAGE: wwv_flow.g_browser_language=en-us
0.00: alter session set nls_language="AMERICAN"
0.00: alter session set nls_territory="AMERICA"
0.00: NLS: CSV charset=WE8MSWIN1252
0.00: ...NLS: Set Decimal separator="."
0.00: ...NLS: Set NLS Group separator=","
0.00: ...NLS: Set date format="DD-MON-RR"
0.01: ...Setting session time_zone to -06:00
0.01: Setting NLS_DATE_FORMAT to application date format: DD-MON-RR
0.01: ...NLS: Set date format="DD-MON-RR"
0.01: Fetch session state from database
0.01: ...Check session 2303701116904676 owner
0.01: Setting NLS_DATE_FORMAT to application date format: DD-MON-RR
0.02: ...NLS: Set date format="DD-MON-RR"
0.02: ...Check for session expiration:
0.02: ...Metadata: Fetch Page, Computation, Process, and Branch
0.02: Session: Fetch session header information
0.02: ...Metadata: Fetch page attributes for application 109, page 50
0.02: ...Validate item page affinity.
0.02: ...Validate hidden_protected items.
0.03: ...Check authorization security schemes
0.03: Session State: Save form items and p_arg_values
0.03: *...Session State: Save Item "P50_ORACLE_SR_ID" newValue="" "escape_on_input="N"*0.03: *...Session State: Save Item "P50_TIMESTAMP" newValue="26-MAY-09" "escape_on_input="N"*
0.03: ...Session State: Save "P0_CURRENT_PERSONNEL_ID" - saving same value: "1"
0.03: ...Session State: Save "P0_OFFSET" - saving same value: "0"
0.03: ...Session State: Save "P0_ACTIVE_WEEK" - saving same value: "24-MAY-09"
0.03: Processing point: ON_SUBMIT_BEFORE_COMPUTATION
0.03: Branch point: BEFORE_COMPUTATION
0.03: Computation point: AFTER_SUBMIT
0.03: Tabs: Perform Branching for Tab Requests
0.03: Branch point: BEFORE_VALIDATION
0.03: Perform validations:
0.03: ...Item Not Null Validation: P50_TIMESTAMP
0.04: Branch point: BEFORE_PROCESSING
0.04: Processing point: AFTER_SUBMIT
0.04: ...Process "Get PK": PLSQL (AFTER_SUBMIT) declare function get_pk return varchar2 is begin for c1 in (select ORACLE_SR_SEQ.nextval next_val from dual) loop return c1.next_val; end loop; end; begin :P50_ORACLE_SR_ID := get_pk; end;
0.04: ...*Session State: Saved Item "P50_ORACLE_SR_ID" New Value="6"*
0.04: ...Process "Process Row of ORACLE_SR": DML_PROCESS_ROW (AFTER_SUBMIT) #OWNER#:ORACLE_SR:P50_ORACLE_SR_ID:ORACLE_SR_ID|IUD
0.04: Show ERROR page...
0.04: Performing rollback...
ORA-01400: cannot insert NULL into ("CAPACITY"."ORACLE_SR"."TIMESTAMP")
Unable to process row of table ORACLE_SR.
Return to application.
Any thoughts would be appreciated.
Thank you,
Justin.

If you changed the Source Type of an item from Database Column to something else, then it cannot participate in the Automated Row Fetch/Automatic Row Processing (DML) choreography. You should leave the Source Type as it was and change the item's Default Value to populate it when the ARF process fetches a null for the column.
Scott

??? On Session State

Background info:
I have a field that could have two different types of input, one would be numeric (such as a PK) the other input to it would be text. To ensure the Automated Row Fetch always pulls the PK properly I am using a computation ON LOAD to turn the text into numeric so that when the Automatic Page Load runs it will always pull from the database based on the PK.
This part is working properly the problem is that I have an item that is a select list and it unforunately has an dynamic LOV with a query of select a,b from table_xyz where value = :session_state_of_pk
This is causing me a problem because it is referencing the "text value" and not the numeric value. Even though when I change my page view to "Events" the page rendering shows computations before Items. I even did a Pl/sql process ON LOAD to insert the :session_state value to a debug table.
So my question is ... If the pl/sql on load process is holding the correct value then why is the LOV of a page item not using the correct value??
This is the error I get on the page Item that is an LOV:Error: ORA-01722: invalid number performing List of Values query

Vikas, I have done this and here are the results:
.01: S H O W: application="110" page="103" workspace="" request="" session="6865688852817169"
0.01: Language derived from: FLOW_PRIMARY_LANGUAGE, current browser language: en-us
0.01: alter session set nls_language="AMERICAN"
0.01: alter session set nls_territory="AMERICA"
0.01: NLS: CSV charset=WE8MSWIN1252
0.02: ...NLS: Set Decimal separator="."
0.02: ...NLS: Set NLS Group separator=","
0.02: ...NLS: Set date format="DD-MON-RR"
0.02: ...Setting session time_zone to dbtimezone
0.02: NLS: Language=en-us
0.02: Application 110, Authentication: CUSTOM2, Page Template: 724212235889446
0.02: ...Supplied session ID can be used
0.02: ...Application session: 6865688852817169, user=JRP22
0.02: ...Determine if user "JRP22" workspace "1786101047996118" can develop application "110" in workspace "1786101047996118"
0.03: Session: Fetch session header information
0.03: Saving g_arg_names=P103_IP_ID and g_arg_values=077.243
0.03: ...Session State: Save Item "P103_IP_ID" newValue="077.243" </b<"escape_on_input="N"
0.03: ...Metadata: Fetch page attributes for application 110, page 103
0.03: Fetch session state from database
0.04: Branch point: BEFORE_HEADER
0.04: Fetch application meta data
0.04: Authorization Check: "6961000503551770" User: "JRP22" Component: "PAGE"
0.06: Computation point: BEFORE_HEADER
0.06: ...Perform computation of item: P103_IP_ID, type=QUERY
0.06: ...P103_IP_ID=select ip_id from IP where IP = :P103_IP_ID;
0.06: ...Session State: Saved Item "P103_IP_ID" New Value="32"
0.06: Processing point: BEFORE_HEADER
0.06: ...Process "TEST DB INSERT SESSION STATE P103_IP_ID": PLSQL (BEFORE_HEADER) insert into t (col1,col2,tstamp) values ('p395',:p103_ip_id,systimestamp);
0.08: Show page template header
0.09: Computation point: AFTER_HEADER
0.09: Processing point: AFTER_HEADER
0.09: ...Process "Fetch Row for IP": DML_FETCH_ROW (AFTER_HEADER) F|#OWNER#:IP:P103_IP_ID:IP_ID
0.10: ...Process "Fetch DNS_NAME To Buffer": PLSQL (AFTER_HEADER) :P103_DNS_NAME_BUFFER := :P103_DNS_NAME;
0.11: ...Session State: Save Item "P103_DNS_NAME_BUFFER" newValue="3657" "escape_on_input="N"
0.11: ...Process "Get Next or Previous Primary Key Value": GET_NEXT_OR_PREV_PK (AFTER_HEADER) #OWNER#:IP:IP_ID::IP::P103_IP_ID:P103_IP_ID_NEXT:P103_IP_ID_PREV::::P103_IP_ID_COUNT:
0.13: ...Session State: Save Item "P103_IP_ID_NEXT" newValue="33" "escape_on_input="N"
0.13: ...Session State: Save Item "P103_IP_ID_PREV" newValue="31" "escape_on_input="N"
0.14: ...Session State: Save Item "P103_IP_ID_COUNT" newValue="32 of 3434" "escape_on_input="N"
0.14: ...Process "Fetch MAC_ADDRESS": PLSQL (AFTER_HEADER) select mac_address into :P103_MAC_ADDRESS from mac_address where IP_ID = :P103_IP_ID;
0.15: ...Session State: Save Item "P103_MAC_ADDRESS" newValue="00-16-3G-33-25-33" "escape_on_input="Y"
0.15: ...Process "Fetch Container_Type": PLSQL (AFTER_HEADER) select container_type into :P103_CONTAINER_TYPE from container_type where container_type_id = :P103_CONTAINER_TYPE_ID;
0.16: ...Session State: Save Item "P103_CONTAINER_TYPE" newValue="BASE_UNIT" "escape_on_input="Y"
0.16: ...Process "Populate Hidden Assign value": PLSQL (AFTER_HEADER) :P103_ASSIGNED_BUFFER := :P103_ASSIGNED;
0.16: ...Session State: Save Item "P103_ASSIGNED_BUFFER" newValue="Y" "escape_on_input="N"
0.16: Authorization Check: "4769021032313739" User: "JRP22" Component: "tab"
From Session State after the page has loaded:
Application Page Item Name Display Item Value Status
110 103 P103_IP_ID Hidden 32 U
Vikas: From the debug info you can the value comes in with the the IP ( I have removed the first two octets from the debug information) "Saving g_arg_names=P103_IP_ID and g_arg_values=077.243"
A few steps later a computation is performed and the IP is chagned to an IP_ID which the value is 32, this is correct at this point.. Following that there is a pl/sql insert of :P103_IP_ID and that value is 32 inside the db table.
Here is what it looks like on the screen:
Any ideas why the Select List LOV does not like this value?
Here is the actual LOV query:
select dns_name,dns_name_id from dns_name where ip_id = :p103_ip_id
Message was edited by:
Justin P

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

Session state protection violation

I turned on the session state protection on my application, the setting for Application Item, Page Data Entry Item and page display-only item are "checksum-required, application level". I want the URL to be shared by user in different sessions (for example bookmark). when I open two browsers (IE, Firefox) and login as same user, I copied/pasted url from one browser to another and received "Session state protection violation: This may be caused by manual alteration of a URL containing a checksum or by using a link with an incorrect or missing checksum."
Did I misunderstand the intent usage of this feature? I also noticed that checksum generated by the system remains the same no matter what checksum level I set (application, user, session).
I am running APEX 3.1.0.00.32.

Cheng-Lu,
I didn't forget you, this was a very difficult problem to debug.
I think I have a workaround for you. I added a page process to your login page named "fix deep link item". This restores the value of FSP_AFTER_LOGIN_URL that gets passed to this login page and is supposed to be immediately saved in session state. Due to a bug, this value was getting truncated to "f" before it could be saved. The new page process looks at the current URL and uses the value there which is still intact and saves that value in session state. I tested it with your applications. Please let me know if this works. We'll make a proper fix in the 3.2 release.
So this was not a problem with session state protection but in the "f" procedure which parses argument names/argument values in f?p URLs. This gets tripped up when an argument value contains a pattern like &cs= which is first treated as an argument to the orignal "f" call and therefore is never seen as an argument value in the list of arguments.
I have some other observations about your applications. I see that they have code in the page sentry function attribute of the authentication scheme. The code you have in there is completely unnecessary and could actually make the application less secure. You should leave this attribute empty and let the default (built-in) page sentry do all the work.
Scott

Database Table Resource - What does it actually do?

Hi,
I want to know what it actually means to grant a database table as a resource to a user in IDM.
For E.g.: When I provision a NT resource to a user using IDM, it means that a Windows NT account is created for that user.
However, when I assign a Database table as a resource for a user of IDM, it does not create a user account for that user.
I am using mySql, and I have assigned a DB table as a resource for a new account. However, I find that such a user is not created in mySql. What does that mean? How then does this user access that database table?
I was under the impression that a user account would be created in mySql having privileges for that table. In effect, a SQL statement like "Grant all privileges on <tablename> to <username> ".
Thanks in advance.

If you want to create or edit mysql users, you would use the MYSQL resource adapter, not the Database Table adapter. The database table adapter is designed to manage rows of a table within the database. Neither allow arbitrary SQL to be excuted, but you could make SQL calls via express in your form or workflow.

Saving session state in database table rather in websever for Ordering App

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