Read-only data objects

What is the best way to ensure that data in the cache is not modified after it is placed in the cache? Is there a way to specify that objects are "read-only"?
My cache clients should have the capability to read and write from/to the cache, but should not be able to modify (or overwrite) exisiting entries. They should just be able to read exisiting entries or add unique new entries.
Thanks!

Hello,
You should be able to extend WrapperNamedCacheto achieve the behavior you want.
An example close to what you want to do is ReadonlyNamedCache
Thanks,
-Dave
Edited by: dcarrano on Dec 1, 2009 4:05 PM

Similar Messages

ADF View Criteria on a Read Only View Object

Hi,
I have created a read only view object using a query. The query consists of analytical functions to fetch the AVG values dynamically.
So far my approach worked fine.
I want the Average values in my query to be calculated dynamically based on the certain view criteria.
But after applying view criteria, my query is formulated as shown below:
SELECT * FROM (SELECT   RECEIVED_YEAR,
           WEEK_NO,
           NO_RECEIVED,
           NO_STARTED,
           ROUND (TO_NUMBER (REPLACE (AVG_HRS_TO_START, ':', '.')),2) AVG_HRS_TO_START,
           ROUND (AVG (TO_NUMBER (REPLACE (AVG_HRS_TO_START, ':', '.'))) OVER (ORDER BY RECEIVED_YEAR),2)              OVERALL_AVG_HRS,
           GOAL_HRS,
           ROUND (AVG (NO_STARTED) OVER (ORDER BY RECEIVED_YEAR), 2) AVG_NO_STARTED,
           ROUND (AVG (NO_RECEIVED) OVER (ORDER BY RECEIVED_YEAR), 2) AVG_NO_RECEIVED
           FROM ORDERS_RCPT_TO_START_VW
ORDER BY RECEIVED_YEAR, WEEK_NO) QRSLT WHERE ( ( ( ( (RECEIVED_YEAR = :RecdYear ) AND (WEEK_NO <= :weekNo ) ) ) ) )
As per this query, it is calculating the Average values first and then applying filter criteria rather than applying the filter criteria and calculating average values.
Please help me on this.

Entity objects are used to update/delete/insert data to the database.
If all your base DB object offers is read then just create a read only view object.

Access denied to a READ-ONLY data source

Post Author: covey9257
CA Forum: Data Connectivity and SQL
I'm using Crystal 10 sevice pack 6. My report is using an ODBC connection to a PSql 9.5 stored procedure. The stored procedure creates a temp table and inserts records from 3 different ticket tables. It has one parameter in it that selects which location to load the table with. My report works fine as long as I don't try to put any of the fields from the temp table on the report. If I do, then I get the following error.
Failed to open a rowset. Details: 42000:[Pervasive][ODBC Client Interface][LNA][Pervasive][ODBC Engine Interface][Data Record Manager][SPEng][Pervasive][ODBC Engine Interface]Access denied to a READ-ONLY data source.
I found that this was an issue in Crystal 9.0, but nothing with cr 10.
Does anyone know of a work around or fix for this scenario??
Thanks - Cathy

Thanks for the quick reply Don.
If you have the option that Pervasive uses to not use the exclusive lock on the DB try adding it to the SQLExpression function in CR.
I am not sure how to accomplish this. I've done some quick searching but cannot come up with SQL that indicates locking unless I am using some kind of language like VB or C#.
Here is my Command Object statement
INSERT INTO RASAPSign
(sVendNo, sChqNo, dtDateSigned)
VALUES
('{?VendNum}', '{?ChqNum}', CURDATE());
SELECT sVendNo, sChqNo, dtDateSigned
FROM RASAPSign
WHERE sVendNo = '{?VendNum}' and sChqNo = '{?ChqNum}'
Can you give me an idea of what to change? Or at least what terminology to search for?
I tried this option with BEGIN and END
BEGIN
INSERT INTO RASAPSign
(sVendNo, sChqNo, dtDateSigned)
VALUES
('{?VendNum}', '{?ChqNum}', CURDATE());
END
SELECT sVendNo, sChqNo, dtDateSigned
FROM RASAPSign
WHERE sVendNo = '{?VendNum}' and sChqNo = '{?ChqNum}'
But I get a syntax error.
Thanks, rasinc
Edited by: rasinc on Apr 14, 2011 3:28 PM
To show code with Begin and End

Read-Only view object won't give me it's row

Hi,
I have a read only view object which when executed has one row in it, but the next method returns null.
this is my code in the AM:
    public Row getPerson() {
        Row row = null;
        ViewObject vo = getPersonsView1();
        vo.setNamedWhereClauseParam("p_login_id", getUserPrincipalName());
        vo.executeQuery();
        System.out.println("rows:" + vo.getEstimatedRowCount());
        if (vo.hasNext())
           row = vo.next();
        return row;
    }and the console log:
06/09/15 10:37:57 [513] select person_id,
login_id,
orig_system_id,
person_type,
title,
preferred_name,
preferred_name ||' '||surname full_name,
first_name,
other_names,
surname,
phone_work,
email_address
from sys_persons
where person_type = 'Staff'
and login_id = :p_login_id
06/09/15 10:37:57 [514] Bind params for ViewObject: PersonsView1
06/09/15 10:37:57 [515] Binding null of type 12 for "p_login_id"
06/09/15 10:37:57 [516] *** DCDataControl.sync() called from :DCBindingContainer.refresh
06/09/15 10:37:57 [517] *** DCDataControl.sync() called from :DCBindingContainer.refresh
06/09/15 10:37:57 [518] **** refreshControl() for BindingContainer :rft_ConsolePageDef
06/09/15 10:37:57 [519] *** DCDataControl.sync() called from :DCBindingContainer.refresh
06/09/15 10:37:57 [520] *** DCDataControl.sync() called from :DCBindingContainer.refresh
06/09/15 10:38:00 [521] Column count: 12
06/09/15 10:38:00 [522] ViewObject: PersonsView1 Reusing defined prepared Statement
06/09/15 10:38:00 [523] Bind params for ViewObject: PersonsView1
06/09/15 10:38:00 [524] Binding param "p_login_id": banstey
06/09/15 10:38:00 rows:1
Source breakpoint occurred at line 38 of SystemServiceImpl.java.Note above System.out.println("rows:" + vo.getEstimatedRowCount()); returns:
06/09/15 10:38:00 rows:1
but when i debug with a break point in the above method if (vo.hasNext()) returns false.
I have tried doing row = vo.next(); without the if statement, but row still evaluates to null.
The VO returns one record in the BC4J tester and I have this exact method and VO defined in another project and it works there. Tearing my hair out with this one...
Brenden

try RowSetIterator instead,
RowSetIterator it = vo.createRowSetIterator("myIt");
if(it.hasNext())
MyVORowImpl row = (MyVORowImpl)it.next()
//don't forget close the RowSetIterator
I guess you use the VO.next(), but the current row of the VO is the one you get from db, and his next is null...

Finding Application Module name in read-only view object classes

Hi all,
I have a fairly basic question about finding application module name when we are coding in ViewObject java classes.
I want to know how can I obtain <<application module>> NAME that our current view object is contained in it at run-time. I think there should be a way to find current application module NAME, when we are in ViewObject classes including View Object, View Row or view object definition classes (I've overridden all mentioned classes).
I should notify that since our view object is read-only I may not count on view object's entity classes, coz as you know a read-only view object don't have any entity in it!
So, if you have any idea about finding current application module name in view object java classes please let me know.
Appreciate for your replies,
Nasser

Thanks guy, it was helpful:)
Now i can access application module name through viewObject classes.
But another question is raised...sorry if i m boring:( I promise its the final question ;)
Is there a way to get application module name in an extended version of JboException class?
Thanks again for your reply:)
Nasser

Using cache for read only data

In my application I have to display some read only data (in number of drop down present on several portlets)
this data might be driven from the database or from some XML/property file.Not decided yet.
for example : Country /state/City/Zip code etc..
Kindly let me know how can I implement the same in Weblogic Portal 10.0.
Do I have to use some third party caching mechanism like Hibernate cache for this
or
Weblogic portal do support caching ??
Please suggest the all possible soultions to implement this.

Cache cache = CacheFactory.getCache("yourCache"); //any name can be passed, and you can create as many as you want , perhaps by functionality, perhaps by size etc. If you want to configure statically you must use this name in the xml file. If you define it in the xml file , you can administer the cache from Portal Admin
cache.put("key","value");
cache.get("key");
There are other advanced things you can do like Time To live / flushing / auto reload the cache which is all described in the javadoc
regards
deepak

Partial read-only view object. How to make it work?

Hello,
is there a way to have a "partial" read-only view object, where some attributes are based on an EO and some others are extracted directly from a table with no corresponding EO?
On this view-object it should be possible to perform row insertions from an af:table, in a way that, after validation (i.e. a row selection change), the values on the attributes not based on the EO do not get lost, even if they do not have any attributes based on an EO.
On the other hand, if I use fake EO attributes ($none$) for those read-only attributes, their values will not gest lost after validation of the new interted rows, but in this case, when the table is first rendered on the page, the table shows empty values on those items, probably because the EO attributes are empty when the query is performed.
Note that It seems I cannot use Transient attributes where their value is calculated with a SQL statement, since it would mean I would have to perform an heavy SQL statement for every transient attribute.
Is there any other solution, I hope the problem is clear.

That solution does not cover the case where an attributed of one entity used as reference is calculated from a SQL expression with parameters involving the remaining attributes of the same entity.
For example consider a reference-only entity based on a table with one field T(COD). This entity has one more attribute other than COD itself, CALCULATED_VALUE.
How can I bind the attribute CALCULATED_VALUE to a SQL expression which is a function of COD: MyDBPackage.GetValue(COD, :environment), where :environment is bind variable?
The frameowork always give me JBO-exception , asking to specify IN or OUT for the variable.

Virt-install hangs at "Write protecting the kernel read-only data",

I am trying to Install Oracle Linux 5.4 as a Paravirtualized Machine on an Oracle VM Server (2.2.1).
Following are the steps that I followed:
I have the dvd iso file on /OVS/iso_pool
1. mkdir -p /el/EL5-x86
2. mount -t iso9660 -o ro,loop /OVS/iso_pool/Enterprise-R5-U4-Server-x86_64-dvd.iso /el/EL5-x86
3. service portmap start
4. service nfs start
5. exportfs *:/el/EL5-x86
6. mkdir /OVS/running_pool/vm01
7. virt-install
and gave the following details
Name of the virtual machine: vm01
RAM:7168
disk path: /OVS/running_pool/vm01/system.img
disk space: 80GB
graphics support: yes
install location- nfs:OVM server ipaddress:/el/EL5-x86
It starts the install, but hangs at
XENBUS: Device with no driver: device/vbd/51713
XENBUS: Device with no driver: device/vbd/51714
XENBUS: Device with no driver: device/vif/0
XENBUS: Device with no driver: device/console/0
Initalizing network drop monitor service
Write protecting the kernel read-only data: 483k
Can you please help
Thanks,
Radhika

Yes I am able to connect to the guest vnc console, and proceed with the install.
I did, Choose a language, choose a keyboard, configure TCP/IP, Manual TCP/IP configuration, after this I am getting a message "That directory could not be mounted from the server"
I tried giving the IPAdress of the OVM Server where the directory was mounted, nothing is working. I cannot proceed any further.

Tabular Form Read Only Date Picker

Hello,
I have two or three Items with date pickers and do not want to implement
this code because it will be too many buttons on my form. I need to clear one item
at a time when the datepicker is readonly but, in a tabular form.
function f_clear_items()
    {$x('P1_ITEMA').value = ''};
    {$x('P1_ITEMB').value = ''};
    }Then once I create a url button and pass this function I can clear the datepicker's. But, I
was wondering is there a cleaner way to this.
I have other items on the page that are named the same but, in different tables. I only want
to clear each date picker item at a time. This code works fine for a regular form.
-Element Post Element Text for the Item to Clear
a href="javascript:setValue('P1_ITEMA','');">Clear Date</aThere is a thread named 'How to clear a read only page Item...?' that states how this code works but, does not
work for a tabular form in a Master Detail page. There is a link on side the Date Picker to clear item specified but, in a tabular form Item, there is no Element tab, any ideas on how to clear a readonly date picker item using a tabular form
and not using a button for each item, thanks in advance. I am using Application Express 3.2.0.00.27.

Dan,
I totally understand your point of view. So, this tabular form aspect was not tested once the Clear Date link was discovered to clear a Read Only date field. Yes, using a button to clear a date is great but, I do not want to clear every date or specified item with the click of one button for this application. It is very useful but, not for my needs at the moment.
Basically, if a date is selected and it needs to be cleared out you can just delete the value. But, if the date is readonly you can not clear/delete the date value unless you have the Clearing functionality for a particular item using the datepicker. It may not be worth the trouble Dan like you state by adding this extra code to the calender. If an invalid date is entered an error will appear anyway.
Thanks alot Dan for expanding my mind and showing me some JQuery and providing me with this link to do some further research if needed, thanks again.

Editable and Read-Only Date Picker have different display formats -- Bug?

Hi all,
This is a follow on to a previous posting about getting a Date Picker field to display read-only (Date Picker and Read-Only Condition works on LAST state of element
Now past that hurdle, I have noticed something about the date picker field when it is displays read-only. Namely, the date format is not the format selected, nor does the read-only date format comply with the format mask in the source section.
I've modified my small test app to work as intended in order to demonstrate this feature. I also opened it up so everyone can see it <blush>. You can find it here: http://htmldb.oracle.com/pls/otn/f?p=42513: Please navigate to the Update Project tab.
When a project in Program One through Four is selected (which has a Spec Committed date), the date is displayed DD-MON-YY format. When a project the other Programs (which do not have Spec Committed dates at the time of this writing) are selected, and a date value selected with the date picker, the date is displayed in the anticipated DD-MON-YYYY format.
Anyone else notice this, or have I just missed something obvious?
Thanks,
Petie

I'm not sure why this happens but to work around it I added this before header process code to the page:
execute immediate 'alter session set nls_date_format = ''DD-MON-YYYY''';
Scott

Read-Only data fields/parameters

Hi
How can I make a data-field (parameter) Read-Only?
For instance : let's say, someone (an Admin) has filled in data into a user form, and saved it. Someone else (who does not have similar Admin status) signs in, and views the form.
I want the second person to be able to view as well as Edit the form. But, not ALL the fields. Some fields should be uneditable (i.e., read only). He can see the data in those fields. But, he is not allowed to modify them.
How is this done?
Thanks.

example how this field is non-editable on condition basis, you can use your condition
<Field>
<Display class='Text'>
    <Property name='value' value='Solanki'/>
    <Property name='title' value='Last Name'/>
    <Property name='disabled'>
      <cond>
        <eq>
          <i>10</i>
          <i>10</i>
        </eq>
        <s>true</s>
        <s>false</s>
      </cond>
    </Property>
</Display>
</Field>

Caching read-only data in a weblogic cluster: Need Help

Hello,
I'm working on the development of a web site that will be based on a weblogic cluster spread across several weblogic instances running on several unix boxes.
To avoid frequent hits to the database, I would like hold a huge amount of data in the application's in-memory cache. The idea is to query the database at startup and store the results in memory for the life of the JVM.
I have three questions around this:
1. Is it advisable to store this data in the form of read-only entity beans?
2. If not, what other options do I have?
3. In some rare cases, a back-end script might change (and commit) data contained in one or two of these 64000 records. What is the best way of propagating these data changes across the cluster?
Any help in this regard would be greatly appreciated.
Regards,
Dipak Jha

Could somebody please guide me on this?
Dipak Jha

Read only data DVD

A photographer has burned me a dvd with photos in NEF format. I can view them with "Quick View", but i can't copy them to my computer. I get an error code -8060 or -35. Under permissions of dvd properties it is "read only". Is it still possible to copy them or I shoold ask photographer to deliver photos to me in some other way?

My MacBook accepts DVDs/CDs and reads/plays them but sends me an error message every time I try to burn. This is totally unacceptable. Does anyone else have this problem?

How to monitor performance in Read Only data base

Hi,
We have a read only database that is using us to run reports against it.
1. How can i monitor performance in this read Only database ?
If i cant run statspack , how can i know what happened last hour for example
in the database ?
2. I use the glance utility to monitor the OS.
I see that the Disk Utilization is 100% and the swap is 80%.
Any suggestion what to do ?
Thanks

Hi,
Since the database is read only its cant be done:
clone SYS@pcrm > @spcreate.sql
... Installing Required Packages
create or replace package dbms_shared_pool is
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-16000: database open for read-only access
Thanks.

MI7.1 Delete the inserted data before sync for the upload only data object

Hi,
I have a upload only data which have insert bapi wrapper only. I am able to save the data and insert data but my problem is how to delete the data before it syncr. Is this possible?? Or must i create a delete bapi wrapper??
Thanks.

Hi,
Thanks for you reply. I manage to delete the inserted data refer to the employee_ui sample application but the data still appear at the backend after sync. Any idea why this happen??
Using the following code i am able to delete the record at the devices. But when it sync the data still get insert to database table.
          ZmovementZmovementheader header = (ZmovementZmovementheader) wdContext.nodeasset_services().nodegetZmovementHeaders().nodegetZmovementHeadersOutput().getCurrentElement().model();
          ZmovementZmovementdetail detail = (ZmovementZmovementdetail) wdContext.nodeasset_services().nodegetZmovementDetail().nodegetZmovementDetailOutput().getCurrentElement().model();
          header.removeFromZmovementdetails(detail);
          root.commit();
thanks
Edited by: fcgan on Aug 28, 2008 10:17 AM

Read-only data objects

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