Question about session variables and binding

Hi All,
I'm a newbie with Application Express. I've gone through several tutorials and a book, and now I'm actually getting started with apex. My first adventure is a tiny little form, where all you do is fill it out and it sends an email. Pretty simple.
And, i have it working just fine - but I have a question about something I don't quite understand. Basically, I am generating the email text in a page process. And some of the form fields work fine if i reference them as *:ACCT_NAME*, but some give me the dreaded "not all variables bound" error. For the ones that give me the error, I can reference them like V('ACCT_NAME').
So, as a newbie, I'm a little confused. When is it appropriate to use the V function, and when it is appropriate to use binding? Why would one of the fields work with binding but not another from the same form?
Thanks for any clarification you can offer,
Lisa

Lisa,
A bind variable is a place holder variable available in an environment.It is used quite frequently(outside Apex Context) in SQL and PLSQL scripts and especially in Dynamic SQL statements.Many times using a bind variable gives better performance. In the Apex environment,page items and many other variables related to the session are available as bind variables and hence their value can be referred in SQL,PLSQL contexts as :VARIABLE_NAME.
Now V() function is an apex specific function which returns the value of an apex session variable outside the apex environment. So as Machaan pointed out, it is used in
procedures and triggers that gets called from within an apex session. This is required since the bind variables themselves are not directly available in the SQL environment but their values from the corresponding session can be accessed by this apex built-in function.
The length of any Bind variable name is limited to 30 characters, this is a limitation inherited from Oracle SQL itself and hence session variables(page or application items) whose name has a length which exceeds 30 characters cannot be used as the :ITEM_NAME format. In such cases you would have to use the v() method again. This might be happening in your case.

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A basic question about static variables and methods

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"... after all, He's not a tame lion..."
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Session variable and initialization block issues

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Hi Amin,
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Hi all,
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When I launch firefox all I get is a tab that says "about session restore" and a spinning beach ball. l

I have been using Firefox for the Mac for years. My operating system is Snow Leopard. I have always updated Firefox as new versions became available. Two days ago when I attempted to launch Firefox I started getting the message "about session restore" and the spinning beach ball. The only thing I can do at this point is do a forced quit. How do I fix Firefox?

Hi rp4035,
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The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. <br>
'''Note''': ''This will cause you to lose any Extensions and some Preferences.''
*Open websites will not be saved in Firefox versions lower than 25.
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#Go to Firefox > Help > Troubleshooting Information.
#Click the "Reset Firefox"[[Image:Button reset]] button.
#Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
#Firefox will open with all factory defaults applied.
'''For Firefox 29.0 and above:'''
#Click the menu button [[Image:New Fx Menu]], click help [[Image:Help-29]] and select ''Troubleshooting Information''.
Now, a new tab containing your troubleshooting information should open.
#At the top right corner of the page, you should see a button that says "Reset Firefox"[[Image:Button reset]]. Click on it.
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Further information can be found in the [[Reset Firefox – easily fix most problems]] article.
Did this fix your problems? Please report back to us!
Thank you.

A question about item "type and release" of source system creation

Hello expert,
I have a question about item "type and release" of source system creation.
As we know,when we create a web servie source system,there will display a pop-up which includes three items as "logical system","source system"and "type and release".
About the item "type and release",when we push "F4" button,there will be three default selections as below:
"ORA 115     Oracle Applications 11i
TLF 205     Tealeaf 2.05B
XPD 020     SAP xPD".
Who can tell me when and how should I use the three selections.
And also I attempted to input the item by some optional letters except the default three selections and it seems that I can input it freely.
Thank you and Best Regards,
Maggie

Hello DMK,
Thank you very much for your answer.It is very helpful for me.
Can I ask you further about it?
I got that it is a semantic description item.
You said the default selections are set by our basis people.Would you like to tell me how should we creat a new value except the default ones for item "type and release"?Only by inputing the value in the item directly?But you see we canot see the new value item we created by ourself when we push "F4" button next time ,is that ok?Or do we have to ask basis people to define one new value item just like the default seletions before we use it.
Also if possible would you like to describe detail about "This becomes important when you are troubleshooting certain issues especially when RFC connection problems."
Thank you and Best Regards,
Maggie
Message was edited by: Maggie

A few questions about the ka790gx and dka790gx

i have a few questions about the ka790gx and dka790gx , how much better is the dka790gx compaired to the ka790gx ? . how much difference does the ACC function make to overclocking etc , i plan on getting a phenom II 940BE or 720BE . i already have the ka790gx so would it be worth building another system using the dka790gx mobo , or should i keep what i already have and just change the cpu ?

It's largely irrelevant what other boards had VRM issues other than the KA790GX - the fact is it died at stock settings. Since there is little cost difference between the more robust DKA790GX (or Platinum if you really need 1394) why bother with the proven weakling? There are other examples around of the KA not having a robust power section. There's no way I would use even a 95W TDP CPU in the KA and absolutely not O/C.....!
As for the credentials of Custom PC, I have generally found their reviews accurate and balanced, and echo my own findings where applicable. If a little too infrequent.
The fact that the KA has such a huge VRM heatsink leads me to my other comments on the Forum, particularly regarding the "fudge" aspect:
"""Henry is spot on - the notion that adding a heatsink to the top of the D2PAK or whatever MOSFETS is effective is virtually worthless. The device's die thermal junction is the tab on the device back - which is always against the PCB pad. The majority of heat is therefore dissipated in to the board, and the fact that the epoxy plastic encapsulation gets hot is simply due to the inability of the heat to be conducted away from the device die via the tab. Not sure when Epoxy become an effective conductor of heat.... Good practice is to increase the size of the PCB pad (or "land" in American) such that the enlarged PCB copper area acts as an adequate heatsink. This is still not as effective as clamping a power device tab to an actual piece of ali or copper, but since the devices used are SMD devices, this is not possible. However, the surface area required to provide sufficient PCB copper area to act as a heatsink for several devices isn't available in the current motherboard layouts. Where industrial SBC designs differ in this respect is to place the VRM MOSFETs on the back of the PCB on very enlarged PCB pads - where real estate for components is not an issue.
Gigabyte's UD3 2oz copper mainboards sound like a good idea, on the face of it. However, without knowing how they have connected the device tabs to where and what remains a mystery. I suspect it is more hype than solution, although there will be some positive effect. From an electrical perspective, having lower resistance connecting whatever to whatever (probably just a 0V plane) is no bad thing.
The way the likes of ASUS sort of get round the problem is to increase the sheer number of MOSFET devices and effectively spread the heat dissipation over a larger physical area. This works to a degree, there is the same amount of heat being dissipated, but over several more square inches. The other advantage of this is that each leg of the VRM circuit passes less current and therefore localised heat is reduced. Remember that as well as absolute peak operating temperature causing reduced component life, thermal cycling stresses the mechanical aspects of components (die wire bonds for example) as well as the solder joints on the board. Keeping components at a relatively constant temperature, even if this is high (but within operating temperature limits), is a means of promoting longevity.
For myself, the first thing I do with a seperate VRM heatsink is take it off and use a quiet fan to blow air on to the VRM area of the PCB - this is where the heat is. This has the added benefit of actively cooling the inductors and capacitors too....
Cooling the epoxy component body is a fudge. If the epoxy (and thus any heatsink plonked on top of it) is running at 60C, the component die is way above that.....
It's better than nothing, but only just."""

Some basic questions about rmi registry context "bind" and "lookup"

We have more processing to do than can be accomplished with a single computer. To solve the problem I've implemented a distributed computing solution using RMI. (The first time I saw RMI was about 2 weeks ago, so please bear with me!)
The implementation is a proof of concept not a fully fleshed out system. I have one "Workunit Distributor" computer and any number of "Data Processor" computers all on the same lan segment. "Workunit Distributor" and "Data Processor" computers are both RMI client and server to each other. The "Data Processor" computers are given the ip address and name of the "Data Distributor" on the commandline when they start. They communicate their willingness to receive and process a workunit to the ""Workunit Distributor" via a RMI call. Work units are sent to available "DataProcessors" and results are eventually returned to the "WorkunitDistributor" (minutes or hours later). The model program works quite well, and appears to be capable of doing the processing we need to get done.
But now that it seems viable, I've been asked to make it a little more scalable, flexible and self configuring. In particular, instead of one "Workunit Distributor", any number of "Workunit Distributors" should be allowed to show up or disappear from the lan at any time and the system should continue to function. I've worked out a good scheme for how this can be done, but I have a couple of questions about the RMI registry (registries?). I'm trying to keep from implementing some functionality that may already be available as a library or subsystem.
With my current model design, each computer binds to its own registry with a unique name. For instance:
CRDataProcessorImpl crdpi = new CRDataProcessorImpl(svr);
Context crDataProcessingContext = new InitialContext();
crDataProcessingContext.bind("rmi:"+hostName, crdpi);
Currently the "Data Processors" get the info they need for a Context lookup() of the one and only "Workunit Distributor" from the commandline. And the info the "Workunit Distributor" needs to do a Context lookup() of a "DataProcessor" is passed to it from each "DataProcessor" via a RMI call.
But in the newer (yet to be implemented) scheme where any and all "Workunit Distributors" show up and disappear whenever they feel like, the naming bootstrapping scheme described above won't work.
I can imagine a few ways of solving this problem. For instance, having "Workunit Distributors" multicast their contact information on the lan and have a worker thread on each "Data Processor" keep track of the naming information that was multicast. Another alternative (more organized, but more complex) might be to have a dedicated host with a "well known" address and port that "Workunit Distributors" and "Data Processors" could all go to, to register or look up at an application level. Sort of a "domain name service" for RMI. But both these schemes look like a lot of work to implement , debug and maintain.
The BEST thing would be if there was one plain vanilla RMI registry that was usable by all RMI enabled computers instead of having each computer have its own local name registry. In volume 2 of the Core Java2 book it says that every registry must be local. I'm only hoping there's been progress since the book was published and now a central rmi registry is available.
If you have any ideas about this I'd like to hear what you know.
Thanks in advance for any advice.
Lenny Wintfeld
ps - I don't believe web services, as full featured as it is, is a useful alternative. I'm moving 100's (in the future possibly 1000's) of megabytes back an forth for processing.

The local bind/rebind/unbind restriction is still there and it will always be there.
I would look at
(a) RMI/IIOP, where you use COSNaming as a registry, which doesn't have that registriction, and which also has location-independent object identifiers
(b) Jini.

Query about User Variables and Advanced Actions

Hello,
I am creating a clinical-based project using Captivate 5.I have to give you quite a bit of information before I can pose my questions so please bear with me.
Users have to select multiple options from a checkbox widget (shown below).
Each options, for example 'location' is associated with a variable for example 'hpi0' (See below):
Each option has addtional data associated with it:
Location = hpi0 (user variable)
Location data = hpi0data (user variable)
Please see the screenshot below:
Notice in the image above that I have created a conditional advanced action - if the user selects Location (hpi0) on the checkbox widget, the data associated with that variable will be presented to them. That data (e.g. location data or hpi0data) is presented in a caption text box in the following slide. (see below)
I hope I have given you enough information.This is a complex project and this is just one of my many problems.I have had to create over 200 hundred user variables and more than 6 Conditional Advanced Actions in one project. The project is becoming unstable. So here are my queries:
1) Are there limits to the amount of user varables I can create in a project?
2) If so, how can I re-use the user variables I have already created? Otherwise I will have to divide this project into 3 parts and I want to avoid doing that.
3) Are there limits to the amount of Advanced actions I can create in a project?
Again I am using Captivate 5 for this project.
Any assistance, tips or tricks would be greatly appreciated. I am learning captivate as I go so If there is away to streamline this process, I am open to any suggestions.
Thanks
Tinukwa

Hello Tinukwa
This is indeed a challenging project, and although I did create a lot of projects with advanced actions, they were never that size. You have to listen to Jim's words about using some widgets, he is a widget specialist which I'm not. I do not know if you are aware of the fact that the checkboxes widget coming with Cp was extended by Jim? He offers it on his website, I blogged about this extension and suppose you do know my blog. About the advanced actions, perhaps I could help but only screenshots are bit limited. So I wonder if either I could have access to the file and/or if we could have a Connect session eventually?
First intuition tells me
we should look to re-use variables, but I do need more information; do you need the vars XXXXdata somewhere else later? If not, perhaps only to display it you could use one variable; now you keep the information chosen by the user in 2 variables: hpi0 and hpi0data (isn't that redundancy?)
and by choosing labels for variables, actions and objects in an intelligent way reduce the editing time because you'll need a lot of almost identical advanced actions. Usually I do a lot of reflection before starting to create labels, variables and actions.
About re-using what you already constructed: as I explained once, a template is the only way to be able to re-use a script at the moment. And Kevin Siegel discovered (so gratefully for that) it is possible just to change the extension of a standard CP file to cptl to have a template.
Lilybiri
PS Jim suggest also to split up the project? Here I'm not sure if that is really needed.. should have been the case for previous versions.

Few questions about apex + epg and cookie blocked by IE6

Hi,
I would like to ask a few questions about apex and epg.
I have already installed and configured apex 3.2 on oracle 10g (on my localhost - computer name 'chen_rong', ip address -192.168.88.175 ), and enable anonymous access xdb http server.
now,
1. I can access 'http://chen_rong' , 'http://localhost' , 'http://192.168.88.175' without input username / password for realm 'XDB' in IE6;
2. I can access 'http://localhost/apex/apex_admin' , 'http://192.168.88.175/apex/apex_admin' , and I can be redirected into apex administation page after input admin/<my apex admin password> for realm 'APEX' in IE6;
3. I can access 'http://chen_rong/apex/apex_admin' in IE6, but after input admin/password , I can not be redirected into administation page, because the cookie was blocked by IE6.
then, the first question is :
Q1: What is the difference among 'http://chen_rong' , 'http://localhost' , 'http://192.168.88.175' ? I have already include site 'chen_rong' into my trusted stes! why the cookie was blocked by IE6. I have already tried firefox and google browser, both of them were ok for 'chen_rong', no cookie blocked from site 'chen_rong'!
and,
1. I have tried to use the script in attachment to test http authentication and also want to catch the cookie by utl_http .
2. please review the script for me.
3. I did:
SQL> exec show_url('http://localhost/apex/apex_admin/','ADMIN','Passw0rd');
HTTP response status code: 401
HTTP response reason phrase: Unauthorized
Please supplied the required Basic authentication username/password for realm XDB for the Web page.
Web page http://localhost/apex/apex_admin/ is protected.
MS-Author-Via: DAV
DAV: 1,2,<http://www.oracle.com/xdb/webdav/props>
Server: Oracle XML DB/Oracle Database
WWW-Authenticate: Basic realm="XDB"
Date: Tue, 04 Aug 2009 02:25:15 GMT
Content-Type: text/html; charset=GBK
Content-Length: 147
======================================
PL/SQL procedure successfully completed
4. I also did :
SQL> exec show_url('http://localhost/apex/apex_admin/','ANONYMOUS','ANONYMOUS');
HTTP response status code: 500
HTTP response reason phrase: Internal Server Error
Check if the Web site is up.
PL/SQL procedure successfully completed
SQL> exec show_url('http://localhost/apex/apex_admin/','SYSTEM','apexsite');
HTTP response status code: 401
HTTP response reason phrase: Unauthorized
Please supplied the required Basic authentication username/password for realm APEX for the Web page.
Web page http://localhost/apex/apex_admin/ is protected.
Content-Type: text/html
Content-Length: 147
WWW-Authenticate: Basic realm="APEX"
======================================
PL/SQL procedure successfully completed
my second questions is :
Q2: After I entered into realm 'XDB', I still need went into realm'APEX'. how could I change the script show_url to accomplish these two tasks and successfully get the cookie from site.
the show_url script is as following:
CREATE OR REPLACE PROCEDURE show_url
(url IN VARCHAR2,
username IN VARCHAR2 DEFAULT NULL,
password IN VARCHAR2 DEFAULT NULL)
AS
req UTL_HTTP.REQ;
resp UTL_HTTP.RESP;
name VARCHAR2(256);
value VARCHAR2(1024);
data VARCHAR2(255);
my_scheme VARCHAR2(256);
my_realm VARCHAR2(256);
my_proxy BOOLEAN;
cookies UTL_HTTP.COOKIE_TABLE;
secure VARCHAR2(1);
BEGIN
-- When going through a firewall, pass requests through this host.
-- Specify sites inside the firewall that don't need the proxy host.
-- UTL_HTTP.SET_PROXY('proxy.example.com', 'corp.example.com');
-- Ask UTL_HTTP not to raise an exception for 4xx and 5xx status codes,
-- rather than just returning the text of the error page.
UTL_HTTP.SET_RESPONSE_ERROR_CHECK(FALSE);
-- Begin retrieving this Web page.
req := UTL_HTTP.BEGIN_REQUEST(url);
-- Identify yourself.
-- Some sites serve special pages for particular browsers.
UTL_HTTP.SET_HEADER(req, 'User-Agent', 'Mozilla/4.0');
-- Specify user ID and password for pages that require them.
IF (username IS NOT NULL) THEN
UTL_HTTP.SET_AUTHENTICATION(req, username, password, 'Basic', false);
END IF;
-- Start receiving the HTML text.
resp := UTL_HTTP.GET_RESPONSE(req);
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DBMS_OUTPUT.PUT_LINE('HTTP response status code: ' || resp.status_code);
DBMS_OUTPUT.PUT_LINE
('HTTP response reason phrase: ' || resp.reason_phrase);
-- Look for client-side error and report it.
IF (resp.status_code >= 400) AND (resp.status_code <= 499) THEN
-- Detect whether page is password protected
-- and you didn't supply the right authorization.
IF (resp.status_code = UTL_HTTP.HTTP_UNAUTHORIZED) THEN
UTL_HTTP.GET_AUTHENTICATION(resp, my_scheme, my_realm, my_proxy);
IF (my_proxy) THEN
DBMS_OUTPUT.PUT_LINE('Web proxy server is protected.');
DBMS_OUTPUT.PUT('Please supply the required ' || my_scheme ||
' authentication username/password for realm ' || my_realm ||
' for the proxy server.');
ELSE
DBMS_OUTPUT.PUT_LINE('Please supplied the required ' || my_scheme ||
' authentication username/password for realm ' || my_realm ||
' for the Web page.');
DBMS_OUTPUT.PUT_LINE('Web page ' || url || ' is protected.');
END IF;
ELSE
DBMS_OUTPUT.PUT_LINE('Check the URL.');
END IF;
-- UTL_HTTP.END_RESPONSE(resp);
-- RETURN;
-- Look for server-side error and report it.
ELSIF (resp.status_code >= 500) AND (resp.status_code <= 599) THEN
DBMS_OUTPUT.PUT_LINE('Check if the Web site is up.');
UTL_HTTP.END_RESPONSE(resp);
RETURN;
END IF;
-- HTTP header lines contain information about cookies, character sets,
-- and other data that client and server can use to customize each
-- session.
FOR i IN 1..UTL_HTTP.GET_HEADER_COUNT(resp) LOOP
UTL_HTTP.GET_HEADER(resp, i, name, value);
DBMS_OUTPUT.PUT_LINE(name || ': ' || value);
END LOOP;
-- Read lines until none are left and an exception is raised.
--LOOP
-- UTL_HTTP.READ_LINE(resp, value);
-- DBMS_OUTPUT.PUT_LINE(value);
--END LOOP;
UTL_HTTP.GET_COOKIES(cookies);
dbms_output.put_line('======================================');
FOR i in 1..cookies.count LOOP
IF (cookies(i).secure) THEN
secure := 'Y';
ELSE
secure := 'N';
END IF;
-- INSERT INTO my_cookies
-- VALUES (my_session_id, cookies(i).name, cookies(i).value,
-- cookies(i).domain,
-- cookies(i).expire, cookies(i).path, secure, cookies(i).version);
dbms_output.put_line('site:'||url);
dbms_output.put_line('cookies:');
dbms_output.put_line('name:'||cookies(i).name);
dbms_output.put_line('value:'||cookies(i).value);
dbms_output.put_line('domain:'||cookies(i).domain);
dbms_output.put_line('expire:'||cookies(i).expire);
dbms_output.put_line('path:'||cookies(i).path);
dbms_output.put_line('secure:'||secure);
dbms_output.put_line('version:'||cookies(i).version);
END LOOP;
UTL_HTTP.END_RESPONSE(resp);
EXCEPTION
WHEN UTL_HTTP.END_OF_BODY THEN
UTL_HTTP.END_RESPONSE(resp);
END;
/

I use oracle database enterprise edtion 10.2.0.3. I have already figured out the epg on 10.2.0.3 to support apex 3.2.
And as I described above, the apex site works fine for ip address , and localhost. but the cookie will be blocked by IE6, if I want to access the site by 'http://computername:port/apex/apex_admin'. This problem does not occured in firefox and google browser. Could someone give me answer?

Question about session variables and binding

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