Loop with apex_application
I am making a loop with the apex_application, but my loop is inline and not collumn.
Has how concatenates APEX_APPLICATION.G_f0||I ?
Example of code:
FOR I IN 8 .. 32 LOOP
IF I < 10 THEN
V_SOM_QTD := V_SOM_QTD + TO_NUMBER(NVL(APEX_APPLICATION.G_f0||I,0));
ELSE
V_SOM_QTD := V_SOM_QTD + TO_NUMBER(NVL(APEX_APPLICATION.G_f||I,0));
END IF;
END LOOP;
Hello Paulo,
>> I am making a loop with the apex_application, but my loop is inline and not collumn.
You didn’t specify the APEX version you are using. If it’s 4.1 and above, you no longer need to loop through the various G_Fxx arrays, but you can reference the column value on each row by using a bind variable notation with the name of the column.
As Paul mentioned, It’s a bit more code to write, but for the long run it’s easier to maintain and it's more readable.
Regards,
Arie.
♦ Please remember to mark appropriate posts as correct/helpful. For the long run, it will benefit us all.
♦ Author of Oracle Application Express 3.2 – The Essentials and More
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Update process with APEX_APPLICATION
Hi Friends,
I have a APEX page made with APEX_ITEM. I created the below process [which will run on a Button Click].
my issue is : Process completes with out updating the Database showing the Process Success Message. I do not see any errors. I checked the documentation and other examples for usage of APEX_APPLICATION and could not find any mistake.
All fXX columns are rightly displayed on the page and are mapped correctly in Insert and Update stmts of the below process.
Any suggestions to debug will help..
<Code here>
DECLARE
v_cp_id NUMBER;
v_cp_line NUMBER;
BEGIN
v_cp_id:=nv('P32_CP_ID');
for i in 1..apex_application.g_f02.count
loop
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SLA = apex_application.g_f06(i),
CSD_LINK = apex_application.g_f07(i)
where CAP_PLAN_ID = apex_application.g_f01(i) and LINE_NO = apex_application.g_f02(i);
ELSE
IF ( apex_application.g_f03(i) is NOT null) then
SELECT NVL(MAX(LINE_NO),0)+1 INTO v_cp_line FROM CP_OTHER_TRANSACTION_DETAILS;
insert into CP_OTHER_TRANSACTION_DETAILS
(CAP_PLAN_ID,
LINE_NO,
BUSINESS_TRANSACTION_NAME,
DESCRIPTION,
TRANSACTIONS_PER_PEAK_HOUR,
SLA,
CSD_LINK
values
(v_cp_id, v_cp_line,
apex_application.g_f03(i),
apex_application.g_f04(i),
apex_application.g_f05(i),
apex_application.g_f06(i),
apex_application.g_f07(i) );
end if;
end if;
end loop;
COMMIT;
END;
</Code here>
Thanks ..Having looked at your app, I would suggest you recreate this page using a Tabular Form based on a Table/View. This feature will automatically take care of adding new rows, updates etc., as well as those all important record lock mechanisms!
As for what you have at the moment, the problem lies in the hidden elements on the form - the PL/SQL process was never dropping into the loop because apex_application.g_f02.count is zero! This is because the columns are flagged as "not shown".
To include these items, modify the SQL in your report to concatenate the items together with the first displayable item on the page.
Therefore something like this:
select apex_item.hidden(1,CAP_PLAN_ID) ||
apex_item.hidden(2,LINE_NO) ||
apex_item.text(3,BUSINESS_TRANSACTION_NAME) BUSINESS_TRANSACTION_NAME,
apex_item.text(4,DESCRIPTION) DESCRIPTION
.NOTE - the first two fields are concatenated to the business_transaction_name column, but remain hidden when the page is displayed!
Hope that makes sense!
Edited by: FFS on 09-Mar-2010 08:51
Edited by: FFS on 09-Mar-2010 09:07
Edited by: FFS on 09-Mar-2010 09:12 -
Hi everybody,
I use the myDAQ to measure speed, ampere, and voltage of a battery driven motor. (For Current measurement, i use a Sensor which outputs a 0-10 V signal). I placed all DAQ-Assitants in a while loop with a [Wait until next ms multiple] clock and set a value of 100 ms. I thougt, Labview will now write into my text file 10 times a second all values. In fact, as you can see in the attached text file, Labview only writes in a unsteady interval of 1-2 seconds a value, which is too less.
The question: Did I do anything wrong, how can you create VI that writes you lets say 10 values a second into text file? Or is simply the DigitalMultimeter input of the myDAQ not able to sample a rate of 10 Hz? I couldn´t find any information in the specification handbook about the sample rate of the DMM?
If anyone can help me would be great! Thanx a lot, Markus
Attachments:
Measure Speed+Current+Voltage into Excel.vi 175 KB
Test7.txt 1 KBFile I/O is not very efficient. I recommend that you do you file logging in a parallel task. Have one task do your data acquision. This task would then pass the data to be logged to the logging task via a queue. That way your file operations do not impact your data acquision. Also, express VIs are not very efficient. You would be better off accessing that directly using the DAQ VIs. The express VIs contain lots of steps that do not need to be done every time you call it such as initializing the device.
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What I would like to do is have a data acquisition loop that samples a load cell at 500Hz and have another loop that runs much slower to run a state machine and display some data in real time. The reason I want to sample the load cell so fast is to filter out some noise. Making producer/consumer loops with a queue kind of makes sense but I don't really care about all of the samples, I just want to be able to read a real time filtered signal at certain times. I looked at having just two parallel loops, one to acquire the data and the other to run a test and retrieve a real-time signal when I want but not sure how to pass data between the loops without using a queue. You can do it with local variables but you are at risk of a race condition. I hope this make sense. I am sure this is a simple problem I just don't know what direction to go. Thanks
Good Evening secr1973,
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The step that I think you are missing is a Case Structure around the enqueue element VI. You likely have some event or specific pattern that you are looking for in the input signal. You can have the output from this algorithm (likely a boolean) determine which case of the Case Structure to execute (Case 1: enqueue the element or Case 2: Do not enqueue the element).
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If it is easy/fast, you can likely get away with doing this processing in the producer loop. My guess is that your program falls under the category of do-it-all-in-the-producer loop because you are only acquiring at 500 Hz.
If the application requires faster acquisition rates or if the logic is going to require some processing, you may want to implement a double layer producer/consumer architecture. In this setup, you would pass all of the data from the DAQ producer to a second loop (using queue #1) that determines what to do with the data (to enqueue or not to enqueue...) and, if appropriate, write to a queue (queue #2) that the third loop can read. The third loop would be where your state machine executes.
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<%
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Code
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see this code.
data: t_spfli type table of spfli with header line,
t_sflight type table of sflight with header line.
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select * from sflight into table t_sflight.
loop at t_spfli.
write:/ t_spfli-carrid,
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and connid eq t_spfli-connid.
write / t_sflight-fldate.
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endloop.
Plz Reward if useful,
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Message was edited by:
Maheswari Chegu -
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Hello All,
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FOR Q1 IN GET_SUM_EXP_QUANTITY LOOP .
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FORMS_DDL('COMMIT');
The fields in bold r required to be displayed for testing puposes..
this gives me numeric or value error in runtime..
Best regards,
Abdetu.. -
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Message Edited by Mark Yedinak on 10-06-2009 04:29 PM
Mark Yedinak
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