Use BC4J inside servlets
Hi,
This may be a dumb question but I'm new to JDeveloper. I created my Business Components and can use it inseide applets and JSP's - but ich couldnt find a way to use it (via wizzard) inside a servlet. Could anybody give me a tip
TIA
Oliver
null
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by David Roberts ([email protected]):
I would like to use the functionality of bc4j data tags inside servlets.
My aim is to do code intensive operations inside a servlet and forward the results, if necessary, to a JSP page.
The most convenient way of accessing data in BC4J are the JSP data tags. I was wondering if there is a way of instantiating them as normal Java Classes in a servlet, and using class methods to perform the database update operations that I want?<HR></BLOCKQUOTE>
null
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<QueryCollection> <finalize> [4354] ##### QueryCollection.finl no RowFilter
<QueryCollection> <finalize> [4355] ##### QueryCollection.finl no RowFilter
<QueryCollection> <finalize> [4356] ##### QueryCollection.finl no RowFilter
<QueryCollection> <finalize> [4357] ##### QueryCollection.finl no RowFilter
<QueryCollection> <finalize> [4358] ##### QueryCollection.finl no RowFilter
<QueryCollection> <finalize> [4359] ##### QueryCollection.finl no RowFilter
<QueryCollection> <finalize> [4360] ##### QueryCollection.finl no RowFilter
<QueryCollection> <finalize> [4361] ##### QueryCollection.finl no RowFilter
<QueryCollection> <finalize> [4362] ##### QueryCollection.finl no RowFilter
<QueryCollection> <finalize> [4363] ##### QueryCollection.finl no RowFilter
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at oracle.jbo.uicli.binding.JUCtrlValueBinding.findAttributeDef(JUCtrlValueBinding.java:632)
at oracle.jbo.uicli.binding.JUCtrlValueBinding.findAttributeDef(JUCtrlValueBinding.java:597)
at oracle.jbo.uicli.binding.JUCtrlValueBinding.getAttribute(JUCtrlValueBinding.java:1341)
at oracle.adfinternal.view.faces.model.binding.FacesCtrlSearchBinding$AdfAttributeCriterion.getOperator(FacesCtrlSearchBinding.java:2240)
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How to upload more than 100mb in using com.oreilly.servlet package
hi all,
I use com.oreilly.servlet package to upload and i use the following code to upload
MultipartRequest mr = new MultipartRequest(request,"/tmp/saved",0x10000000);My problem is i can't upload more than 25mb, uploads upto 25mb and shows page cannot displayed err in IE,
Pls helpIn the webserver there is most likely a configuration option for the maximum size that a request may have. So search through the manual of your particular webserver on how to change that.
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What is the benefit of using BC4J?
Folks,
After working with BC4J for three months, I still can not convince my manager to use BC4J. His major arguments are:
1. Which applications or web sites are implemented using BC4J? Are they real application or just a demo. For the time being, I even can not show him a demo, not to say any real web applications.
2. His developers told him that the O-R mapping provided by BC4J, which is probabably one of the key benefit of BC4J can be easily coded manually with a couple of days work for the current task and we have the full control over our own code while BC4J is not an open source and the lack of the support from Oracle really worries him.
Can someone in Jdev team give me a clear evidence to convince him?
Thanks,
Yibing[list]
[*]With regard to struts integration with BC4J, I have done some investigations of the new release and know that BC4JActionForm is only good for simple view and does not work for a joint table view as I have reported a few days ago in this group and no response is received yet.
This should not be the case. Should work for any view object. View objects can contain join queries with any number of updateable tables in them. Please email me the URL to the forum posting so I can track down the issue.
[*]I have been recently told indirectly from Oracle that the consulting group at oracle are not using BC4J and instead they think that BC4J only applies to simple applications with limited number of tables and relationships.
This is plain incorrect. We have very large applications using BC4J both internal in Oracle Applications, for Oracle iLearning, and many external customers. Many of these projects have involved (and are currently involving) Oracle Consulting. Not sure where got this information, but it is incorrect.
[*]Other commecial O-R mapping products such as top-link should be used for large applications
The key difference between Oracle9i TopLink and Oracle9i BC4J has nothing to do with the size of your project. The fundamental difference is that toplink is for customers who have already written a custom application framework and who require just a persistence architecture, because they've already hand-written code to implement all of the other J2EE design patterns that are required to build real J2EE applications.
Conversely, BC4J is for customers who want a complete J2EE Application Framework (and tightly integrated, award-winning toolset to go with it) to avoid having to write, test, debug, and maintain their own application framework.
There is simply no evidence to backup your statement that BC4J only works for small applications. I am aware of at least 20 (and by now after a summer full of training additional Oracle Apps development teams in BC4J, perhaps over 30) that are using BC4J for full-scale, self-service J2EE web applications. Our BC4J reference info pages (link in this thread above) have references to customers who are using BC4J for large applications as well.
[list]
Hope this helps. -
How to use BC4J with JDeveloper 9i in a Team
Hello
I'm not sure if I'm to stupid, but to say the truth I didn't found the clue how to share a BC4J Application between several develeopers. Maybe someone can give me a hint.
That's my situation:
Our team is going to develop a web application using BC4J and BC4J-JSP, nothing special I think.
But my problem is, that BC4J and especially the wizards refer to a lot of different files. Even simple changes often result in multiple files being changed in different parts of the project.
Creating a view link between view objects in two packages for example changes the view objects in both packages. Also the project (.jpr) file or several "BC4J.xcfg" files are changed very often.
So it is not easy to find parts of code from which I can say they are owned by one developer and others which are owned by another. Most often, if you have to merge the work of different developers, you have to edit the BC4J-XML-Files using an external editor. Or did someone find a better way? Please tell me!
So, what is the best way to share code between developers?
Should I partition the application by packages?
- advantage:
it allows a fine partitioning
- disadvantages:
it has the great danger that BC4J makes changes in other packages which will be overseen when merging.
Should I create a projects for each developer and distribute code between the projects using libraries?
- advantage: no unseen changes will happen, as the libraries are readonly.
- disadvantages: no view links between view objects in different projects (Libraries) are possible! Also a lot of "load errors" can occure when updating a library, which have to be manually corrected in the dependent projects.
Are source code management systems a real help in this problem or do they just "manage" the problem? I already tried SCM and PVCS but was not very happy with the way of working. As JDeveloper is not "really easy" to use with theese tools.
So I would like to get any hints how other developers are dealing with this problem. Are you using BC4J with JDeveloper 9i in a team? Please tell me how do it and how you have partitioned your application.
Thanks in advance
Frank BrandstetterHi,
I'm not sure whether my answer is good enough for you, but it might help.
First of all, you have to use JDev 9.0.3, because 9.0.2 has big problems with associations/view links between objects in different projects.
Creating a view link between view objects in two packages for example changes the view objects in both packages. Also the project (.jpr) file or several "BC4J.xcfg" files are changed very often.This is not completely true in 9.0.3, as you may choose not to create an accessor in the imported object (and usually you don't need it neither!). As for bc4j.xcfg, there is a trick: define a "standard" database connection name to use all over your project! This will prevent modifying these files all the time!
Should I create a projects for each developer and distribute code between the projects using libraries?
- advantage: no unseen changes will happen, as the libraries are readonly.
- disadvantages: no view links between view objects in different projects (Libraries) are possible! Also a lot of "load errors" can occure when updating a library, which have to be manually corrected in the dependent projects.I would say, projects for each application component, which by chance will be managed by a single developer at a time.
As for the disadvantages, in 9.0.3 you are able to properly create associations and links using read-only objects. Hopefully, the release version will solve some generation inconsistencies...
Concerning the errors that occur when modifying a library, this might be balanced by the relative independence of the components... If you are able to develop following the dependency tree, you will not meet the problem very often.
Are source code management systems a real help in this problem or do they just "manage" the problem? I already tried SCM and PVCS but was not very happy with the way of working. As JDeveloper is not "really easy" to use with theese tools.Indeed, I do not have a SCMS really able to manage merges in the BC4J XML files... We rather try not to arrive there!
So I would like to get any hints how other developers are dealing with this problem. Are you using BC4J with JDeveloper 9i in a team? Please tell me how do it and how you have partitioned your application.I really hope that my hints will help.
Regards,
Adrian -
HOWTO: Use BC4J With or Without DB Triggers
This HowTo describes how to use BC4J, database sequences and triggers
and what are the ramifications.
INTRODUCTION
BC4J has the ability to work with database sequences in order to obtain a
unique value when inserting records. BC4J also has the ability to
work either with a 'before insert' trigger which automatically creates
a new unique value for the primary key or without a trigger. When not using
a database trigger, BC4J also has the ability to obtain the sequence value
and set the primary key value.
Before discussing the ramifications of using one approach or the other, let's
show examples of how to use both approaches:
BC4J & sequences WITH a database trigger
and
BC4J & sequences WITHOUT a database trigger
HOWTO DEMONSTRATION STEPS
To illustrate both scenarios a simple database setup script is provided which
creates two tables:
CUSTOMER_NT which DOES NOT have a before insert trigger and
CUSTOMER_WT which DOES have a trigger.
Database Install Script:
<code>
drop trigger customer_insert_trigger;
drop table customer_wt;
drop table customer_nt;
drop sequence customer_wt_seq;
drop sequence customer_nt_seq;
create sequence customer_wt_seq start with 1;
create sequence customer_nt_seq start with 101;
create table customer_wt(
id number,
name varchar2(30),
constraint
customer_wt_pk
primary key (id)
create table customer_nt(
id number,
name varchar2(30),
constraint
customer_nt_pk
primary key (id)
prompt Inserting data...
insert into customer_wt (id, name)
values (customer_wt_seq.nextval, 'Mickey');
insert into customer_wt (id, name)
values (customer_wt_seq.nextval, 'Goofy');
insert into customer_nt (id, name)
values (customer_nt_seq.nextval, 'Daffy');
insert into customer_nt (id, name)
values (customer_nt_seq.nextval, 'Porky');
commit
prompt Creating trigger
create trigger customer_insert_trigger
before insert on customer_wt for each row
begin
select customer_wt_seq.nextval into :new.id from dual ;
end;
</code>
The next step is to create the DEFAULT Entity Objects and View Objects using
the Business Components Wizard.
USING BC4J WITH A DATABASE TRIGGER
Let's modify the entity object CustomerWt so it can use the database trigger.
Edit the entity object CustomerWt by right-clicking in the navigator.
Click on the 'Attribute Settings' tab and edit the ID attribute.
- Uncheck 'Mandatory'checkbox. This allows you to insert without a value for the primary key
- Check 'Refresh after Insert'. This obtains the value from the database generated by the trigger.
- Check 'Updateable While New'. Id is only updateable when inserting.
Click finish to complete the wizard. Save all and recompile the project.
Now let's test our work.
In the navigator right-click the application module and select 'Test..'. This will launch
BC4J's built in tester. Connect to the application.
In the tester double-click the CustomerWtView view object to run a test edit form.
After the edit form renders, navigate through the existing records using the navigate
buttons on the edit form. Now let's insert a record to execute the trigger.
click on the '+' button to insert a record. Enter a value in the 'Name' field and commit the change.
Observe that a new value has automatically been inserted into the Id field.
That's it! You have successfully used BC4J and a database trigger.
Now let's try it without a trigger..
USING BC4J WITHOUT A DATABASE TRIGGER
Now edit the entity object CustomerNT so it doesn't need a database trigger.
Similar to before, edit the entity object CustomerNt by right-clicking in the navigator.
Click on the 'Attribute Settings' tab and edit the ID attribute.
- Uncheck 'Mandatory'checkbox.
- Check 'Updateable While New'.
An additional step is also required. The Create method will have to be modified to extract
the value of the sequence.
In the Edit EntityObject Wizard click the Java tab and select Create method and click Finish.
The create method is generated in your Java fil e. In the Workspace view of the Navigator,
expand the CustomerNt entity object in the navigator. Double-click
CustomerNtImpl.java to open it in the Source Editor. In the Structure pane, double-click
create(AttributeList). Modify the Create method so it looks like this:
<code>
public void create(AttributeList attributeList) {
super.create(attributeList);
SequenceImpl s = new SequenceImpl("customer_nt_seq", getDBTransaction());
Integer next = (Integer)s.getData();
setId(new Number(next.intValue())); }
</code>
Save and compile the project.
Now test the ViewObject CustomerNtView using the tester as before.
In the edit form of CustomerNTView click on the '+' to insert a record. Observe that
just as before a new value has automatically been inserted in the ID field!
TO USE A DB TRIGGER OR NOT TO USE A DB TRIGGER.
Using a Database trigger sometimes preferable if you have non BC4J applications
also sharing the database. In this case it is still safest to just let the database
update it's own primary keys.
If you don't have any other non-BC4J applications sharing the database, then not using
a database trigger is perfectly acceptable and can have slightly better performance.
The important thing to remember is that the option is yours to use either approach!
nullThank you for the reply Jonathon. I am using a ViewObject which
consist of several tables. I haven't tried the DB trigger
approach but just using the BC4 approach in overriding the
create method.
Here is the parent class create as a part of the
FasNameImpl.java file which does the job correctly.
public void create(AttributeList attributeList) {
super.create(attributeList);
SequenceImpl l_seq = new SequenceImpl
("SEQ_CUSTOMER_ID",getDBTransaction());
Integer l_next = (Integer)l_seq.getData();
setCustomerId(new Number(l_next.intValue()));
This is when I triedpassing the value to the child table. But I
can't figure it out. I think the link is working fine if I had a
ViewLink deployed but it doesn't look like it's doing the job
for ViewObject.
I am trying to call the childclass.method
(FasCustomer.setCustomerId(l_next);
But I am getting error.
Thanks a lot for your suggestions,
Kamran
703 696 1121 -
How to use GUI_DOWNLOAD inside BSP Application event
Hi All,
I am facing one issue while using GUI_DOWNLOAD inside BSP Application. When the processing goes at GUI_DOWNLOAD it gives me unknown error where as the same code is working when used in report program. My requirement is to save password into excel file at my local machine. I am using FM MS_EXCEL_OLE_STANDARD_DAT to save password in excel file but this function module fail when it reach at GUI_DOWNLOAD . Can you please help me out.
Thanks and Regards
Pradeep Kr. RaiDear Pradeep,
Find the below link which explains a simple data download to excel from a table view.
www.sapt echnical.com/Tutorials/BSP/Excel/Index.htm
Try to avoid the way your using in the BSP application and it is abdicable to use the standard methods / class available like "cl_bsp_utility"
Hope this will be helpful.
Regards,
Gokul.N
Edited by: Gokul on Oct 8, 2009 9:57 AM -
How can i upload a image file to server by using jsp or servlet.
Hi,
I m gurumoorthy. how can i upload a image file to server by using jsp or servlet without using third party API. pls anyone send me atleast outline of the source code.
Pls send me anyone.
Regards,
Gurumoorthy.I'm not an applet programmer so I can't give you much advice there.
If you want to stream the file from the server before it's entirely uploaded, then I don't believe you can treat it like a normal file. If you're just wanting to throw it up there and then listen to it, then you can treat it like a normal file.
But again, I'm not entirely certain. You might be able to stream the start of the file from the server while you're still uploading the end of it, but it probably depends on what method you're using to do the transfer.
Maybe you are looking for
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