How to set primary key of the VO.

I have a problem with the master detail search. The search works fine on the first search, all details can be seen fine, but in the second search I get this error.
The number of displayed records, 1, exceeds the actual number of records, 0, in view object EgoItemAdvancedSearchAM.MYACCESSOR001_MYLINK001_DetailsOrderLinesVO. Some of the displayed records may have been deleted.
Somwhere in another thread, someone had the same problem and the soultion was to set primary key of the master VO. I am not sure how to set primary key of a VO. In my case the master VO is dynamic. Is there a way I can set PK of a dynamic VO.
Any help greatly appreciated.

Hi
Thanks for your reply...
am seting the primary key to VO attribute in my controller(PR)...but its not mapping to the VO attribute..
OAAttachmentImageBean Ibean = (OAAttachmentImageBean)webBean.findChildRecursive("OpAttachments");
String[] pkvaule = {"ResAttribute15"};
Ibean.setPkColumns(pkvaule);
Regards
Harrrry

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its my personal need..then it is a very bad personal need. DATE is not an appropriate type to be using for a primary key, as it cannot be guaranteed to be unique, especially when inserting multiple rows at once.
You would be better working to business needs and implementing correct technical solutions to those needs, than to just do things based on your personal needs.

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Thanks Mona
Tom.
Mona Ramlawi <[email protected]> wrote:
Hi TOM,
The primary key is the unique identifier of an Entity Bean.
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I have a nice master detail form.
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Hope I'm clear. My english not perfect.
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Edited by: Christian from France on Oct 16, 2009 6:36 AM

Christian,
After creating Master-detail form, goto your Detail page. In this page you can see one conditonal brach which will point to 'Master' page.
Edit this branch and here you can see this branch fires when request is in 'SAVE,DELETE,CREATE' (in Expression1). Now change the value in Expression1 to 'SAVE,DELETE'. This will do the needful :-)
Cheers
Hari
Edited by: Hari_639 on Oct 16, 2009 8:02 PM

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Edited by: tiplip on 2011-1-22 上午5:43
Edited by: tiplip on 2011-1-22 下午5:52
Edited by: tiplip on 2011-1-23 下午7:42

Hi tiplip,
Bellow I will describe how you can support "SELECT * FROM table WHERE X = key ORDER BY Y" queries using Berkeley DB, which, as you suspected, should be done by using a composite index.
First of all, think of Berkeley DB as the storage engine underneath an RDBMS. In fact, Berkeley DB was the first "generic data storage library" implemented underneath MySQL. As such, Berkeley DB has API calls and access methods that can support any RDBMS query. However, since BDB is just a storage engine, your application has to provide the code that accesses the data store with an appropriate sequence of steps that will implement the behavior that you want.
If you have two indices in SQL, each on a single column (call them X and Y), and you do:
SELECT * FROM table WHERE X = key ORDER BY Y;then there are three plausible query plans:
(1) scan the whole table, ignore both indices, filter by X = key then sort by Y;
(2) use the index on Y to scan all rows in the required order, filter by X = key;
(3) use the index on X, find the matching rows, then sort by Y.
There are cases where (1) would be fastest, because it has all of the columns from one scan (the other query plans will do random lookups on the primary for each row). This assumes that the data can fit into memory and the sort is fast.
Query plan (2) will be fastest if the selectivity is moderate to high, looking up rows in the main table is fast, and sorting the rows is very slow for some reason (e.g., some complex collation).
Query plan (3) will be fastest if the selectivity is small (only a small percentage of the rows in the table matches). This should be the best case for us, making it the best choice in a Berkeley DB key/value application.
The optimal plan would result from having a composite index on (X, Y), which can return just the desired rows in the desired order. Of course, it does cost additional time and space to maintain that index. But note that you could have this index instead of a simple index on X: it can be used in any query the simple index could be used in.
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X Y
1 10 abc
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As in SQL, retrieving by a secondary key is remarkably similar to retrieving by a primary key and the Berkeley DB call will look similar to its primary equivalent.
tiplip wrote:
Plus, do you have any suggestion about retrieval performance given the fact that topics retrieval will happen each time browser want to request the next page, that is, 2nd 25 topics of this forum?As you are concerned about the performance, I think this would be the fastest solution. Of course, you can tune the performance at a later time, after you have the functionality in place. What I think you should do first is to increase the cache size and test with a bigger database page size, and maybe to configure the transactional subsystem (in case you use one).
If you are not very familiar with how to implement the above in BDB, please read the Guide to Oracle Berkeley DB for SQL Developers, available at: http://www.oracle.com/technetwork/articles/seltzer-berkeleydb-sql-086752.html
You will also need to be familiar with the following documentation:
Related documentation pages:
Secondary indexes - http://download.oracle.com/docs/cd/E17076_01/html/programmer_reference/am_second.html
Cursor operations - http://download.oracle.com/docs/cd/E17076_01/html/programmer_reference/am_cursor.html#am_curget
DBcursor->get() - http://download.oracle.com/docs/cd/E17076_01/html/api_reference/C/dbcget.html
DB_SET_RANGE - http://download.oracle.com/docs/cd/E17076_01/html/api_reference/C/dbcget.html#dbcget_DB_SET_RANGE
If my answer helps you with your question, please go ahead and rate it as Helpful or Correct, and the forum thread as answered. For each unrelated question, please create a new forum thread.
Good luck with building your forum application,
Bogdan Coman
PS: If you are a BDB licensed customer, you can also use My Oracle Support (https://support.oracle.com) to visit the KM note 1210173.1, that discusses the same topic.

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"Alex Roytman" <[email protected]> wrote in message
news:9q27co$r35$[email protected]..
What is the most logical place to automatically set primary key fieldsfrom
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How to set primary key of the VO.

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