EJB & database view

I have an entity bean (CMP) which connect to a view in database (Sybase). In the EJB-JAR.XML, i connect to the view name and the fields in the view. However, when i tried to deploy the EJB in weblogic, i encounter the followign problem:
The Entity EJB requires the table: v_draw_result to be accessible. Please ensure that this table exists and is accessible.
But infact, i already created the view in my database.
What'st he problem?? and how to solve this problem?
THanks!!

Hi,
Maybe there is a permission part required from the database end.
Like oracle, grant all required permissions to the user accessing the table/views.
Hope this helps,
Seetesh

Similar Messages

Database Views with Entity EJBs

Is it possible to use Weblogic Workshop to create a CMP entity EJB on an Oracle database view for a Weblogic 8.1 server?
Is there special configuration I need to do for either the Oracle or Weblogic side to accomplish this?
Thanks.
Tania

I can manually create the EJB, an it builds just
fine, but when I go to deploy it, I get the following
error:
[EJB:011076]Unable to deploy the EJB
'AssortmentMerchandise' because the databas
e table 'K_BA01.BAV_ASRT_CLUSTR_DAT' is not
accessible. Please ensure that this
table exists and is accessible.
The view is on the same datasource that I have
successfully created all of my other entity EJBs
(from tables).
I can select data from the view using JDBC and the
same datasource that I am trying to associate the EJB
to.
Any ideas what might be wrong with my view?Are you using synonyms or aliases? I would double check those...
Log in using same username and password as weblogic and try a simple query:
select * from K_BA01.BAV_ASRT_CLUSTR_DAT

Bad performance when using complex database view with Toplink

Hi
Problem description
1. I have a complex query that collects the data from many DB tables. For this reason I create a database view based on this select. Using EJB 3.0 with Toplink I
mapped this view to a java object the same way I map database tables. The method I use to get the results is:
snippet code...
public List<VwKartela> VwKartela(Integer pperid) {
List<VwKartela> results = null;
Session session = getSessionFactory().acquireSession();
ExpressionBuilder bankfile = new ExpressionBuilder();
Expression exp1 = bankfile.get("perid").equal(pperid);
ReadAllQuery query = new ReadAllQuery();
query.setReferenceClass(VwKartela.class);
query.setSelectionCriteria(exp1);
results =(List<VwKartela>)session.executeQuery(query);
When running the select on the view prom SQL Plus I haven’t any performance problem.
2.Question: How can I improve the performance? I referenced to Toplink docs but I didn't improve the it.
Have anyone any experience is such cases?
Thank you
Thanos

Hi
After my last tests I conclude at the followings:
The query returns 1-30 records
Test 1: Using Form Builder
- Execution time 7-8 seconds
Test 2: Using Jdeveloper/Toplink/EJB 3.0/ADF and Oracle AS 10.1.3.0
- Execution time 25-27 seconds
Test 3: Using JDBC/ADF and Oracle AS 10.1.3.0
- Execution time 17-18 seconds
When I use:
session.setLogLevel(SessionLog.FINE) and
session.setProfiler(new PerformanceProfiler())
I don’t see any improvement in the execution time of the query.
Thank you
Thanos

CMP Entity Bean from dataBase views

Hi forum,
I Have to migrate an existing application to JEE (with EJB3).
In this application there are a lot of dataBase views.
I'm new in EJB3 and I don't know how to structure cleanly entity beans (Specially when it are created from dataBase views).
My problem is that for each query made from the same dataBase view I almost have to create a new entity bean with a different @Id.
What can I do to to avoid it?
I had thought to genrate a new @Id (attribute not persistent) but I think is not possible. It's right ?
Someone can help me ?
Thanks

"CMP provides you with database independence and less coding efforts."
BMP is not database dependent, unless you invoke database specific things in your SQL (something I do not do). CMP on the otherhand is inherently appserver specific (which was it's goal when BEA, IBM, et al. came up with it), and still limits your design possibilities. See this thread for an example:
http://forum.java.sun.com/thread.jsp?forum=13&thread=318785
As for less coding effort, that is a relative statment. Yes a simple CMP bean requires less coding to develop the first time. I personally view a few lines of SQL to load and store the data as being fairly trivial. But that needs to be offset with the problems inherent in using appserver specific CMP implementations.
As an example, try mapping WebSphere CMP to a pre-existing database without using IBM's IDE. It's an incredible pain in the ass since WebSphere does not come with a "meet-in-the-middle" solution. Any J2EE developer that has had the experience of working with different appservers (especially if they have had to port an app, as I have) can attest to the complications that arise with each implementation.
A BMP bean, written with non-DB-specific SQL, is the most portable, most flexible approach to EntityBeans. Yes, it requires the developer to be able to write some SQL, which should not take a significant amout of time. WRT queries, you have to write them, either SQL, EQL, or some appserver specific format.
As an aside, the use of code generators to simplify the creation of EJBs lends itself well to BMP. By using a (or writing your own) code generator, you can mitigate the annoying SQL bugs that creep up early in development.

Database View do not refresh in ADF application

Greetings,
im facing a weird problem in my application (JDeveloper 11.1.2.4.0 - ADF). All this time i was working directly with tables (VO), but now i also started using database views.
Everything works fine, when i add a new row in a table that my Database Views is associated with, it refresh properly.
BUT if i delete rows manually from my database, the View do not refresh in my application, not by refreshing the page,
redeploying application, even executing the view object query inside the view object. The only way for the DB View to be
refresh inside the JDeveloper and on deployment time is by restart JDeveloper. I try adding an action on my OV to re-execute them when
i do something specifically, hopefully the will reset the cache and retrieve the DB view again, but with no luck..
Correction: now it doesnt even refresh on restart jdeveloper.
Just for the clarification, im talking about Database Views, and not just Object Views. I create a Object View inside the application to retrieve the data
from the Database View results.
Can you help me on this please?

Yes the queries in SQLDeveloper was showing me correct results.
But i feel disappointed.. When i went to close SQLDeveloper to try something, it pop me a message to commit/rollback changes.
After i commit them, my app show correct results too.

Snowflake dimension: named query vs. database view

A test question features a Product table with a Product Size code; Product Size description is taken from ProductSize table. As far as I can tell, the question asks me to choose between (a) setting up a database view joining Product and ProductSize, and
(b) doing the join in a data-source-view named query. I don't see a clear winner. (My thinking is as follows. Yes, he view would speed up the processing, even if not materialized. On the other hand, with a small dataset, the performance gain would be
minor in absolute terms. Do I want to have an extra database object in the picture?) Yet the question's author does. Can anyone advise please?

Hi Demyan,
According to your description, you want to know which is better, using named query in datasource view or using database view, right?
Based on my research, there is no performance differences between using named query in datasource view and using database view because they both result in SQL query being sent to the source system. Here is a blog which discuss this issue.
Consistency: If you already have logic in database views, I would continue to use them. As long as you know that you go to one spot to view/change the logic. Putting the logic in 2 different spots could lead to confusion.
Security Permissions: often you may not have permission to alter the source databases, in this case you have no choice but to setup named queries in the dsv.
Reference
http://geekswithblogs.net/darrengosbell/archive/2006/09/05/90278.aspx
http://bennyaustin.wordpress.com/2013/07/16/dbview/
Regards,
Charlie Liao
TechNet Community Support

Set operator NE in Database View creation in join condition

Hi Experts,
I have a requirement to set NE(not equal) operator in join condition of Database View creation. Could you please help me how to set in operator.
Join condition :
Ex : BSAK-AUGBL NE BSAK-BELNR.
You know that by default operator is '='. i want to set NE in place of '='.
Thanks,

Hi Chinna,
Check whether if there is any possibility or not to include more key fields like bukrs, lifnr, gjahr etc in the where condition, so that you query may result faster. Then, there won't be any necessary to create the view.
Hope this helps.
Please reward if useful.
Thanks,
Srinivasa

How to call database view in report

Hi i have a small problem in report
the problem is like this i had created a database view in which i got all the values displayed but can any one of you tell me how to declare this database view in report with example
i had created a database view named as znew1
and the fields are
             LIFNR LIKE EKKO-LIFNR,
             EBELN LIKE EKKO-EBELN,
             LIFNR1 LIKE LFA1-LIFNR,
             NAME1 LIKE LFA1-NAME1,
             EKBE   LIKE EKBE-EBELN,
             VGABE LIKE EKBE-VGABE,
             MATNR LIKE EKPO-MATNR,
             WERKS LIKE EKPO-WERKS,
             NETWR LIKE EKPO-NETWR,
             MENGE LIKE EKPO-MENGE,
             MWSKZ LIKE EKPO-MWSKZ,
             TXZ01 LIKE EKPO-TXZ01,
             KOSTL LIKE EKKN-KOSTL,
        PS_PSP_PNR LIKE EKKN-PS_PSP_PNR,
             EBELN1 LIKE EKKN-EBELN,

Hi Mr. Rich
This is the program code and i want this output int he alv grid format
TABLES:EKKO,EKBE,EKPO.
DATA:BEGIN OF RTAB_ALV OCCURS 30,
             LIFNR LIKE EKKO-LIFNR,
             EBELN LIKE EKKO-EBELN,
             LIFNR1 LIKE LFA1-LIFNR,
             NAME1 LIKE LFA1-NAME1,
             EKBE   LIKE EKBE-EBELN,
             VGABE LIKE EKBE-VGABE,
             MATNR LIKE EKPO-MATNR,
             WERKS LIKE EKPO-WERKS,
             NETWR LIKE EKPO-NETWR,
             MENGE LIKE EKPO-MENGE,
             MWSKZ LIKE EKPO-MWSKZ,
             TXZ01 LIKE EKPO-TXZ01,
             KOSTL LIKE EKKN-KOSTL,
        PS_PSP_PNR LIKE EKKN-PS_PSP_PNR,
             EBELN1 LIKE EKKN-EBELN,
     END OF RTAB_ALV.
DATA:IZNEW1 TYPE TABLE OF ZNEW1 WITH HEADER LINE.
select * into table IZNEW1 FROM ZNEW1 UP TO 10000 ROWS.

EJB Finder View Links and CMR

Hi,
Can someone please give me some input on the following warning in the JDeveloper online help!
"Warning: You cannot create an EJB finder view link that expresses the same relationship as a CMR."
I'm new to EJB, BC4J and JDeveloper. I created container managed entity beans with local interfaces only to represent my data and relationships. No problems with the mapping so far.
To test the beans I used Session Facades with remote interfaces and build a sample test client.
Now I thought I could create EJB Entity Facades, EJB Finder View Objects, EJB Finder View Links and EJB Application Modules to make use of the BC4J framework in order to speed up programming clients (JSP and JClient).
So I've started studying the JDeveloper online help (which seems to be very useful) and found the above mentioned warning.
Well, better a warning than nothing at all, but some more explanations would have been even better.
Is there no need to use view links with CMR?
How to achieve the same functionality (synchronizing two view objects in a master-detail-relationship) with CMR?
Do you know any examples? I couldn't find any examples using EJB entity facades in the "sample code" area on OTN.
Any comments about other (better) architectures are also welcome. Would it be better to use BMP entity beans in conjunction with BC4J?
Many thanks for your help!
Regards,
Eric

Steven,
thank you for your reply and suggestions - I'll count on that. If I find time I'll read this book. It seems to be very interesting.
For educational purposes I'd like to look at both persistence implementation strategies. I agree that it looks definitly easier to use entity objects. Certainly it's also performancewise a better choice.
Anyhow, could you give me some useful tips for cmp entity beans and finder view objects?
Is there something which works completely different if I use BC4J on top of it?
How to implement a master-detail relationship in JClient (Swing) for example?
What about writing an ejbfinder which doesn't return all, but all data where the foreign key is equal to a parameter passed to the finder method and use this as the source for a detail view object. This could be the primary key of the selected master. Well, I don't know whether this is doable. But that's what comes to my mind spontaneously.
Would this be a solution? I'm still thinking about the aforementioned warning in the online help regarding view links.
I guess the problem is that the foreign key is not part of the entity bean as it's not a cmp-field. Instead you have accessor methods to retrieve a related object or a collection of objects.
I'm sure my questions are not too complicated to answer. It's only hard for a beginner to get an overview.
I'm quite confident that I'll manage this if I give my best and get some help from knowledgeable people like you Steven.
Regards,
Eric

Using database views in ADF mobile client application

Hi,
I am using Jdeveloper 11.1.1.4 and WLS 10.3.4.
I have developed a POC in ADF mobile client application both with and without synchronization. However, both work with entity objects based on tables.
I need to use database views instead of tables. When I try to include entity object (based on views) in the view object, it shows an error saying "Only the entity objects based on tables can be selected"
Please guide me if there is a work around for this.
Also, please let me know if there is way to develop an ADF mobile client application skipping the use of entity objects at all and using view objects directly to specify the database query and fetch data from the database.
Thanks in advance.
Ansh
Edited by: ansh on Mar 28, 2011 5:40 AM

Hi, Ansh:
Currently, out of box, ADF Mobile Client does not support synchronization against Database Views. This is because Mobile Server imposes some schema restrictions to ensure synchronization with multi-table views would work correctly. This schema restriction requires, for example, the view must have a primary parent table with key defined, and also all base table must be included in the data publication. These dependencies requires manual resolution and advanced planning, and is managed outside of the ADF Mobile Client/JDeveloper project.
To continue development, you would need to create server Entity Objects directly against the base tables. You can then create the mobile ADF Business Component (EOs, VOs, etc). You can then create View Objects in your ADF Mobile Client application based on the database views, in order to retrieve the data you need exactly. In other words, instead of basing EO on the database view, create View Objects in the mobile applicaiton to mimic what you had in the View Object.
Is there any other reason why you would need to access data via database views, instead of directly against base tables?
Thanks,
Joe Huang

How to delete a record in Database View?

HI All,
I have created a Database View using tables LIKP,LIPS,VBUK,VBUP.
In that view I am getting a extra record which is not exit in any tables
but its getting in database view.
I tried buffer memory refresh and even tried SE16n , SE11(thro CODE(DELE))..But record has not been
deleted.
Plz suggest wat shud i have to do to delete the record.
Thanks in advance and help realy appriciate.
Regards
Steve

>
Steve Johnson wrote:
> In that view I am getting a extra record which is not exit in any tables
> but its getting in database view.
Your intention should be in search of the root of that extra record. Not the deleting it without knowing anything.
Sure, You have put join conditions correctly?
Cheers

Z Database view is not showing all the entries?

Hello
Last year I have created a Z table, say, its name is Z_TABL_1, its working fine, say, there is around 1000 entries in PRD, well
Last week I have created another 2nd Z table, its name is Z_TABLE_2, now it has 50 entries in PRD
In both tables the key field os the same (VISITOR_NUMBER) and there is only one key field in both tables, its the same
When creating the 2nd table I forgot to specify the CHECK table relationship in 2nd table refering 1st table, I mean, dependent table is 2nd whereas reference is 1st table
Now, I created a database view, say, my_db_view on these 2 tables.
When I opened this my_db_view in SE16, I expected 1000 (this 1st table count) entries, but am seeing just 50 (the 2nd table has only 50 entries) entries!!
Pls. let me know how can I view all the 1000 entries in SE16 for my_db_view?
Thank you

Hi,
in your DB view tables are joined and database views implement an inner join (you can check here: http://help.sap.com/saphelp_nw04s/helpdata/en/cf/21ecab446011d189700000e8322d00/content.htm), that's why the system extracts only 50 records.
It's not possible to have all the 1000 records using a database view.
Marco

Progammatic update a table with a database view in the page

Hi All,
I am using JDev 11g. With FOD database schema, I have one database view Products which comes from two tables Products_Base and Product_Transactions. I created three EOs (ProductEO, ProductsBaseEO, ProductTransactionsEO) and three VOs (ProductVO, ProductsBaseVO, ProductTransactionsVO) based on their EOs respectively.
Here is my scenario. I have an ADF form which is based on the database view Products and is dragged and dropped from Data Controls->ProductVO. When an existing record is submitted, a backing bean method will be called to update the data against the table Products_Base (and the table Product_Transactions at the same time) programmatically. An update method updateProductPrice() is added into the Application Module and published it to UI Client. The submit button in the page is created by directly dragging and dropping Data Controls->updateProductPrice into the page. When I run it, I got the following error message,
Failed to post data to database during "Update": SQL Statement "UPDATE PRODUCTS ProductEO SET COST_PRICE=:1 WHERE PRODUCT_ID=:2".
What I don't understand here is that, in my update method updateProductPrice(), it supposes to update the table Products_Base. But from the error, it appears that it is trying to update the view Products. Can anyone give me a help on what I did wrong here? When I try to debug it, it throws an exception to this line in the method updateProductPrice(),
getDBTransaction().commit();
Here are my codes,
The method which got called in the backing bean
public String cb6_action() {
DCBindingContainer bc = (DCBindingContainer)getBindings();
FacesCtrlAttrsBinding ProductId = (FacesCtrlAttrsBinding)bc.get("ProductId");
FacesCtrlAttrsBinding CostPrice = (FacesCtrlAttrsBinding)bc.get("CostPrice");
JUCtrlActionBinding action =
(JUCtrlActionBinding)bc.findCtrlBinding("updateProductPrice");
DCDataControl dc = action.getDataControl();
ApplicationModule am = (ApplicationModule)dc.getDataProvider();
AppModule service = (AppModule)am;
service.updateProductPrice(new Long(ProductId.toString()), CostPrice.toString());
return null;
public BindingContainer getBindings() {
return BindingContext.getCurrent().getCurrentBindingsEntry();
The update method defined in the Application module (AppModuleImpl.java)
public void updateProductPrice(long productId, String costPrice) {
ProductsBaseEOImpl product = retrieveProductById(productId);
if (product != null) {
try {
product.setCostPrice(new Number(costPrice));
getDBTransaction().commit();
catch (JboException ex) {
getDBTransaction().rollback();
throw ex;
catch (SQLException ex1) {
getDBTransaction().rollback();
private ProductsBaseEOImpl retrieveProductById(long productId) {
EntityDefImpl productDef = ProductsBaseEOImpl.getDefinitionObject();
Key productKey = ProductsBaseEOImpl.createPrimaryKey(new DBSequence(productId));
return (ProductsBaseEOImpl)productDef.findByPrimaryKey(getDBTransaction(),productKey);
Edited by: john wang on Oct 27, 2009 7:14 AM

or
merge into test
using (select rowid rid
            , id
            , sub_id
            , startdate
            , lead (startdate) over (order by id, sub_id) - 1 ed
       from test) x
on (x.rid = test.rowid)
when matched then
   update set end_date = x.ed
;

Short Dump while fetching values from a Database view

Hi ALL,
Here is the code that is giving short dump
SELECT * FROM ZVMATLMOVE INTO TABLE I_MATLMOVE
    WHERE BUDAT >= V_LASTRUN_DATE
    AND   WERKS IN S_WERKS
    AND   LIFNR IN S_LIFNR
    AND   EBELN IN S_EBELN
    AND   MATNR IN S_MATNR
    AND   BWART IN S_BWART
(Please don't say that I am using * in the select query,
I knew that it is not a good way of fetching values)
Declaration of the internal table is:
DATA I_MATLMOVE LIKE ZVMATLMOVE OCCURS 0 WITH HEADER LINE.
The variable V_LASTRUN_DATE is:
DATA V_LASTRUN_DATE LIKE SY-DATUM.
We will be getting the lastrundate value from another table. And it is passing correct value (ex. 20060731)
ZVMATLMOVE is a database view created for MKPF and MSEG table. And I checked both table were consistent.
Dump Analysis:
Runtime errors         DBIF_RSQL_SQL_ERROR
Exception              CX_SY_OPEN_SQL_DB
Every thing is fine. But I don't know how it is going to dump. Any suggestions?

Hi !
It seams that your table is not correct / fully activated.
To check it out you should try the following:
- Go to the SE11
- Give it your table name and go to "Display"
- Check if the table is "active"
- Choose "Utilities->Database Object->Check" and see
if there are any errors
- go back and choose "Utilities->Runtime Object->Check"
and see if there are any errors
If there are any errors - try to activate the table again. You may need the "Utilities->Database Utiliy" for that.
After there are no more errors by checking all these your program should work.
Regards
Rainer
Some points would be nice if thate helped a bit.

Help on a database view

What database view would you use to ascertain whether transactions are being committed?
Thanks
Karthik

A badly written application will have lots of uncommited records that is shown in V$TRANSACTIONS view. If you see many uncommited transactions then get the developers do the application tuning. This may also lead to many locks.

EJB & database view

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