for loop in a procedure stored

I have Windows XP with 10g 10.2.0.1.0
I got errors that I executed the following codes. Can I use select in exception inside the loop, if not, I have another other way to solve the problem? Help, please.

LINE/COL ERROR
-------- -----------------------------------------------------------------
249/3 PLS-00103: encountered the symbol "EXCEPTION" when expected
of the following:
begin case declare end exit for goto if loop mod null pragma
raise return select update while < ID >
< between double quote delimited identifiers of > < a variable binding > < <
Close current delete fetch locking insert open rollback
SAVEPOINT SQLExecute set pipe fusion commit forall

247/17 PLS-00403: expression "V_COUNT" cannot be used as a target-INTO
a SELECT/FETCH statement



v_count NUMBER (1): = 0;
for v_count in 1.cols.count)
loop
SELECT 1 IN v_count FROM USER_TAB_COLUMNS WHERE table_name = nom_table_p
AND column_name = cols (v_count);
EXCEPTION
WHEN NO_DATA_FOUND THEN
raise_application_error (-20001, passes (v_count) |) 'does not exist');
while others then
raise_application_error (-20011, sqlerrm);
end loop;

Hello

Of course, you can have an EXPECTION article inside a loop. Ensure that correspondents starements BEGIN and END are inside the loop, too, like this:

...     v_count NUMBER(1) := 0;
BEGIN
     FOR  v_count IN 1..cols.count()
     LOOP
          BEGIN
               SELECT  1
               INTO      v_count
               FROM      USER_TAB_COLUMNS
               WHERE      table_name      = p_table_name
               AND     column_name       = cols (v_count);

               ...
          EXCEPTION
               WHEN NO_DATA_FOUND THEN
                       RAISE_APPLICATION_ERROR ( -20001
                                   , cols (v_count) || ' does not exist'
                                   );
               WHEN OTHERS THEN
                       RAISE_APPLICATION_ERROR ( -20011
                                   , SQLERRM
                                   );
          END;
     end loop;
END;

This is one of the many situations in which withdrawal correctly your code can avoid mistakes.
Notice how it is easy, given the statements BEGIN, EXCEPTION, END or LOOP, to see where the corresponding END, EXCEPTION, BEGIN or LOOP statement is and what the scope of this block.

Do you really need (or even want) to trigger the error-20011? Why not raise the original instead error? Why do something with these errors: why not let the default Oracle error handling to catch them?

On the other hand, tyou have two separate variables, called v_count.
That reported on the first line above (before the BEGIN statement) is not used anywhere.
It is set in the HEART... Declaration of the LOOP and is used inside this loop, including the EXCEPTION section withion that loop.

Do you really need to do a select... INTO in the loop? If possible, it would be less evil and more effective, for the results of the SELECTION... AT the same time, you get the other data.

Published by: Frank Kulash, August 10, 2010 13:35
Deleting duplicate EXCEPTION statement.

Tags: Database

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  • parallel for loops does not

    Hello.

    I'm learning the multi - thread programming. To start, I use "parallel for loops" and I was surprised that it does not work. One - thread loop work a few times faster (depending on settings) that multi - thread. I don't know why, and it is my request to correct my Vi to work properly.

    Lenovo, G580, Windows 7, 64-bit computer

    Intel Core i7 3632QM
    Ivy Bridge
    Specification Intel (r) Core i7-3632QM CPU @ 2.20 GHz
    Package (platform ID) Socket 988 B rPGA (0x4)
    Number of hearts 4
    Number of threads 8

    LabView 2011.

    Altenbach says:

    Gibbon wrote:

    What was 'strange' behavior?  In "linia dluga" when inside the loop is on '1' of the "spreed up' between one and multi-fil is about 3 times, when I put it in '20' this grow to 6.2. It was strange form me, becourse I expect a similar value.

    A parallel FOR loop has an overhead for parallelization (split the problem, then go back the results, etc.). If the code is very fast, the overhead is proportionally larger. If the Subvi takes a long time to complete, the overhead of parallelization is insignificant. It is often not worthwhile to parallelize the loops with a very simple and fast code.

    Gibbon wrote:

    Altenbach - I have another question if you can help me - how did you "seconds relative high resolution." VI "? -I want to say how did you know that there is this 'vi '. And thanks a lot for your modyfications.

    You can find it in vi.lib\utilities. It is well known.

    Maybe not well known enough!  the 'Hidden gems' package adds to your palattes.  It has also been considered by a nugget of the community

  • For loop runs with the value of N unwired

    In this case will be a loop run connected to the loop N worthless? I have seen a few examples of the loop for run without a certain number of times set to be ran wired or for example a size of table or something like that.

    PauldePaor wrote:

    Here's a program I am and as you can see the image that the program runs without the loop N being wired. The program will run without problem

    As everyone else has said, you don't have to plug something on N.  If you wire up a table for loop for input "auto-index", the loop for will run automatically the smaller table size.

    Perhaps an example will help:

    This makes a loop on my table size (in this case, long of 5 elements).  On the edge of the loop for which resembles [] brackets, indicates that it is auto-indexé.  The loop should go through each item one at a time (1, then 2, then 3, then 4, then 5).

  • Préallouée VI environment in paralleled for loop

    Hello

    I searched a bit and couldn't find that everything about this specific issue.

    If I have a Subvi in a parallelized for loop and the Subvi is set upon reentrant preallouee clone, the Subvi register also several characteristics of memory depending on the number of loop iteration For? My specific application is a Subvi containingvibration Analytisis screw using the previous data in their spread and filters.

    Thank you!


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