KVO with nested arrays?

I'm working on an app with the typical UITableView displaying rows grouped into sections. I have an NSMutableArray of Section objects, each of which has an array of Entry objects. Manual KVO is working for adding and removing Section objects. I can use a key path of "sections" and everything works as expected.
I'd like to use KVO for operations on the entries array in each Section object so I can add/remove table rows as entries are added/removed in each Section. Using a key path of "sections.entries" doesn't work. I get an NSInvalidArgumentException with [<NSCFArray 0x104fbb0> addObserver:forKeyPath:options:context:] is not supported. Key path: entries in the console. After a bit of thought, the error makes sense: the sections property is an NSMutableArray, which of course doesn't have an entries property.
How do I do this? Is there a better way that I'm missing?

Well, after a bit of fiddling I found a solution. I'm not sure if it's the right solution, but it appears to work.
I had been assuming that the key path had to be somehow related to actual properties of objects. But, on a whim, I made up a key path that corresponded to nothing, and it worked. I can issue and observe events on my fake key path just fine.

Similar Messages

Complex query - improve performance with nested arrays, bulk insert....?

Hello, I have an extremely complicated query, that has a structure similar to:
Overall Query
---SubQueryA
-------SubQueryB
---SubQueryB
---SubQueryC
-------SubQueryA
The subqueries themselves are slow, and having to run them multiple times is much too slow! Ideally, I would be able to run each subquery once, and then use the results. I cannot use standard oracle tables, and i would need to keep the result of the subqueries in memory.
I was thinking I write a pl/sql script that did the subqueries at the beginning and stored the results in memory. Then in the overall query, I could loop through my results in memory, and join the results of the various subqueries to one another.
some questions:
-what is the best data structure to use? I've been looking around and there are nested arrays, and there's the bulk insert functionality, but I'm not sure what is the best to you
-the advantage of the method I'm suggesting is that I only have to do each subquery once. But, when I start joining the results of the subquery to one another, will I take a performance hit? will Oracle not be able to optimize the joins?
thanks in advance!
Coop

I cannot use standard oracle tablesWhat does this mean? If you have subqueries, i assume you have tables to drive them? You're in an Oracle forum, so i assume the tables are Oracle tables.
If so, you can look into the WITH clause, it can 'cache' the query results for you and reuse them multiple times, also helpful in making large queries with many subqueries more readable.

Performance Problems with intrinsic array multiplikation in Fortran with Su

Hello,
I found a serious performance problem in my application with intrinsic array multiplikation. Therefore I wrote a small test program to check if this a general problem or only exists in my code.
The test program (as seen below) was compiled with Sunstudio12 und Solaris 5.10 on an 64 bit Amd Opteron Machine. First with high optimization (f95 -fast -g), and the second time with out optimization (f95 -O0 -g). In both cases the intrinsic array mupltiplication had a lot of tlb and L2 cache misses (I made some test with the performance analyzer) which caused a huge increase in computation time compared to the explicit loop. In the ideal case the compiler should create the nested loops from the intrinsic statement and both functions should use exactly the same computing time.
I also tried compiling with Studio11, the problem also occurs there. Maybe its a compiler bug but I'm not sure.
Greetings
Michael Kroeger
program test
!Test zur Ausfuehrung einer einfachen array Multiplikation
implicit none
real,dimension(:,:,:),pointer::check1,check2
integer i,j,k,ni,nj,nk,status
ni=1000
nj=1000
nk=100
allocate(check1(0:ni,0:nj,0:nk),STAT=status)
write(*,*)status
allocate(check2(0:ni,0:nj,0:nk),STAT=status)
write(*,*)status
check1(i,j,k)=25
check2(i,j,k)=25
call intrinsic_f(check1)
call withloop(check2,i,j,k)
deallocate(check1,check2)
contains
subroutine intrinsic_f(check1)
real, dimension(:,:,:),pointer::check1
check1=check1*5
end subroutine intrinsic_f
subroutine withloop(check2,ni,nj,nk)
real, dimension(:,:,:),pointer::check2
integer i,j,k,nk,nj,ni
do k=0,nk
do j=0,nj
do i=0,ni
check2(i,j,k)=check2(i,j,k)*5
enddo
enddo
enddo
end subroutine withloop
end program

I will try the large pages, but what me puzzles is, that the intrinsic function has cache misses, but the loop function has not. All documentation says, that the compiler would expand the intrinsic function into 3 nested loops, so that both functions should be essential the same (and the compiler says it has created 3 loops from the intrinsic). Since they are not the same, this is a severe problem.
I have a fairly large code for high performance simulations, and this intrinsic functions are a significant bottle neck. If it is not a compiler bug, I would have to rewrite all intrinsic functions into loops.

Access nested array element using this.name - is it possible?

Hi
I've got a nested array containing a series of 2 element arrays containing an object name, and text related to that object.
I've set it up like this:
public var names:Array = [["instance name 1", "text for first object"],["instance name 2", "text for second object"], ...]];
What I'm trying to do is to have the text related to the object appear in a text box when the object is moved.
This is all set up within a class containing code for the drag and drop functions.
If I set the text box to show a specific element, such as:
MovieClip(parent).text_box.text= names[2][1];
it works fine. But I can't get it to create the value for the first bracket from the this.name attribute.
I had it working for 2 arrays - one with the name and another with the text where the code was;
MovieClip(parent).text_box.text= texts[names.indexOf(this.name)]; (arrays named 'names' and 'texts', text box named 'text_box')
I'm hoping there's something similar that I can do for the nested array, but everything I try gives me the #1010 error - term undefined.
Is there an easy way to sort this out - or am I better sticking with the 2 array version?
(BTW this is my first go at using arrays)
Thanks

Why not use an Object for this, like:
var oTexts:Object = {
                              "clipname1":"text for clip 1",
                              "clipname2":"text for clip 2",
                              "clipname3":"text for clip 3",
and then jsut use sometihing like this
var txt:String = MovieClip(parent).oTexts[this.name];
etc. ..

Custom taglib with nested tag not working

Hi everybody,
I have a question concerning a custom taglib. I want to create a tag with nested child tags. The parent tag is some kind of iterator, the child elements shall do something with each iterated object. The parent tag extends BodyTagSupport, i have overriden the methods doInitBody and doAfterBody. doInitBody initializes the iterator and puts the first object in the pageContext to be used by the child tag. doAfterBody gets the next iterator object and puts that in the pageContext, if possible. It returns with BodyTag.EVAL_BODY_AGAIN when another object is available, otherwise BodyTag.SKIP_BODY.
The child tag extends SimpleTagSupport and does something with the given object, if it's there.
In the tld-file I have configured both tags with name, class and body-content (tagdependent for the parent, empty for the child).
The parent tag is being executed as I expected. But unfortunately the nested child tag does not get executed. If I define that one outside of its parent, it works fine (without object, of course).
Can somebody tell me what I might have missed? Do I have to do something special with a nested tag inside a custom tag?
Any help is greatly appreciated!
Thanks a lot in advance!
Greetings,
Peter

Hi again,
unfortunately this didn't work.
I prepared a simple example to show what isn't working. Perhaps it's easier then to show what my problem is:
I have the following two tag classes:
public class TestIterator extends BodyTagSupport {
    private Iterator testIteratorChild;
    @Override
    public void doInitBody() throws JspException {
        super.doInitBody();
        System.out.println("TestIterator: doInitBody");
        List list = Arrays.asList(new String[] { "one", "two", "three" });
        testIteratorChild = list.iterator();
    @Override
    public int doAfterBody() throws JspException {
        int result = BodyTag.SKIP_BODY;
        System.out.println("TestIterator: doAfterBody");
        if (testIteratorChild.hasNext()) {
            pageContext.setAttribute("child", testIteratorChild.next());
            result = BodyTag.EVAL_BODY_AGAIN;
        return result;
public class TestIteratorChild extends SimpleTagSupport {
    @Override
    public void doTag() throws JspException, IOException {
        super.doTag();
        System.out.println(getJspContext().getAttribute("child"));
        System.out.println("TestIteratorChild: doTag");
}The Iterator is the parent tag, the Child shall be shown in each iteration. My taglib.tld looks like the following:
<?xml version="1.0" encoding="UTF-8"?>
<taglib
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee web-jsptaglibrary_2_1.xsd"
     xmlns="http://java.sun.com/xml/ns/javaee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.1">
     <tlib-version>1.0</tlib-version>
     <short-name>cms-taglib</short-name>
     <uri>http://www.pgoetz.de/taglibs/cms</uri>
     <tag>
          <name>test-iterator</name>
          <tag-class>de.pgoetz.cms.taglib.TestIterator</tag-class>
          <body-content>tagdependent</body-content>
     </tag>
     <tag>
          <name>test-iterator-child</name>
          <tag-class>de.pgoetz.cms.taglib.TestIteratorChild</tag-class>
          <body-content>empty</body-content>
     </tag>
</taglib>And the snippet of my jsp is as follows:
     
     <cms:test-iterator>
          <cms:test-iterator-child />
     </cms:test-iterator>The result is that on my console I get the following output:
09:28:01,656 INFO [STDOUT] TestIterator: doInitBody
09:28:01,656 INFO [STDOUT] TestIterator: doAfterBody
09:28:01,656 INFO [STDOUT] TestIterator: doAfterBody
09:28:01,656 INFO [STDOUT] TestIterator: doAfterBody
09:28:01,656 INFO [STDOUT] TestIterator: doAfterBody
So the child is never executed.
It would be a great help if anybody could tell me what's going wrong here.
Thanks and greetings from germany!
Peter
Message was edited by:
Peter_Goetz

How to find and modify item in a nested array collection?

Hi,
would anybody know how to find and modify item in a nested
array collection:
private var ac:ArrayCollection = new ArrayCollection([
{id:1,name:"A",children:[{id:4,name:"AA",children:[{id:8,name:"AAA"}]},{id:5,name:"AB"}]} ,
{id:2,name:"B",children:[{id:6,name:"BA"},{id:7,name:"BB"}]},
{id:3,name:"C"}
Let's say I've got object {id:8, name:"X"} , how could I find
item in a collection with the correspoding id property, get handle
on it and update the name property of that object?
I'm trying to use this as a dataprovider for a tree populated
via CF and remoting....
Thanks a lot for help!

Thanks a lot for your help!
In the meantime I've come up with a recursive version of the
code.
This works and replaces the item on any level deep:
private function findInAC(ac:ArrayCollection):void{
var iMatchValue:uint=8;
for(var i:uint=0; i<ac.length; i++){
if(ac
.id == iMatchValue){
ac.name = "NEW NAME";
break;
if(ac
.children !=undefined){
findInAC( new ArrayCollection(ac.children));
However, if I use the array collection as a dataprovider for
a tree and change it, the tree doesn't update, unless I collapse
and reopen it.
Any ideas how to fix it ?

How Do You Populate A Spark List Control With An Array?

Hello, all,
Sorry to come accross so frustrated, but how in the name of God do you populate a Spark list control with the data in an array? You used to be able to do this with the mx:List control, but the guys developing Flex just had to make things more difficult than they need to be! I am more of a code purist and prefer doing things the way they have been done for decades, but apparently nothing can ever stay simple!
I simply want to populate a list control with an array and this shouldn't be rocket science! I found out that I must use a "collection" element, so I decided that an arrayCollection would be best. However, after searching Adobe's documentation about arrayCollections, I am lost in a black hole of data binding, extra lines of code just to add a new element, the need to sort it, etc...!
Here is my code:
var pendingArray:ArrayCollection = new ArrayCollection();
for ( var i:int = 0 ; i < queue.length ; i++ )
     var item:UserQueueItem = queue[i] as UserQueueItem ;
     if ( item.status == UserQueueItem.STATUS_PENDING )
     pendingArray.addItem({label:item.descriptor.displayName,descriptor:item.descriptor});
Here is the relevant MXML:
<s:VGroup>
     <s:List id="knockingList" width="110" height="100"/>
</s:VGroup>
I'm not getting any errors, but the list is not populating.
I have seen several examples where the arrayCollection is declared and populated in MXML:
        <mx:ArrayCollection id="myAC">
            
            <fx:Array id="myArray">
                <fx:Object label="MI" data="Lansing"/>
                <fx:Object label="MO" data="Jefferson City"/>
                <fx:Object label="MA" data="Boston"/>
                etc...
           </fx:Array>
        </mx:ArrayCollection>
That may be fine for an example, but I think this is a rare situation. Most of the time I would image that the arrayCollection would be created and populated on the fly in ActionScript! How can I do this?
Thanks in advance for any help or advice anyone can give!
Matt

In your post it seemed like you were trying to take care of many considerations at once: optimization, design, architecture. I would suggest you get something up and running and then worry about everything else.
If I use data binding, then I will probably have to declare the arrayCollection as a global variable and then I'll have to write 100 or so extra lines of code to addItem(), removeItem(), sort(), etc... It just seems like too much overhead.
I believe you may have some misconceptions about databinding in general. You won't have to make it a global variable and you certainly won't need an extra 100 lines of code. If you did this forum would be a very , very quiet place.
I don't want to use data binding because the original array is refreshed often and there is one function called by an event that re-declares the arrayCollection each time, populates it with the array, and then sets it as the list's dataprovider.
That is the beauty of the ArrayCollection, it can handle the updates to its source Array. I don't know if you need to redeclare the ArrayCollection, resetting the source to the new Array allows everyone involved to keep their references so you don't have to worry about any "spooky" stuff going on.

Help with parallel arrays of different data types

Hello all, I am having an issue with parallel arrays. My program requires me to read information from a text file into 4 parallel arrays (2 String and 2 double). My text file needs to look something like this:
John Johnson
0000004738294961
502.67
1000.000
Jane Smith
0000005296847913
284.51
1000.000
...and so on
Where the first thing is the name (obviously), an account number, the balance in the account, and the credit limit. I just cant figure out how to read everything into the arrays. We havent learned anything too heavy, and this seems a little too advanced for my class, but I guess we will manage. Any help will be appreciated. Thanks guys.
Casey

Man this is a dumb homework assignment. The requirements scream out for a class along the lines of
public class Account{
private String name, number;
private double balance,creditlimit;
// more code here
}and then to use a List of Account objects.
Anyway what's your actual problem. There's nothing very hard about it. A loop. So....
You should consider posting (formatted) code showing what you have done and where exactly you are stuck.

Issues with nested for loops - saving images from a camera

Hi all,
I've written a vi. to capture a specific number of images ('Image No') and save these images, outputted to a folder of my choice. Each image is identified sequentially. However, I wish to do a number of iterations ('Run') of this capture sequence, such that the filename of each image would be 'Filename (Run)_(Image No).png', e.g. run 5, image 10 would be 'Filename 5_10.png'. I have tried a nested for loop for this but I receive an error 'Asynchronous I/O operation in progress' (I've attached a printscreen).
Can anyone assist me in solving this problem? I preiously posted this in machine Vision but got no response (http://forums.ni.com/t5/Machine-Vision/Capturing-image-sequences-issues-with-nested-for-loops/m-p/19...). Please find attached my vi.
Kindest regards and thanks,
Miika
Solved!
Go to Solution.
Attachments:
Labview problem.jpg ‏3841 KB
Image sequence save to file.vi ‏48 KB

Miika,
the problem is not the filenam, but the name of the folder (AHHHHH!). You try to create the same folder in the outer for loop over and over again.... (it is the error message above the '======', not below )
Norbert
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.

Trouble with primitive arrays and casting, lesson 521

hi everyone!
there is a problem i discovered right now - after years with java where was no necessity to do this.....
and i'm shure this must have been the topic already, but i couldn't find any helpful resource :-/
right here we go:
1. an array is a (special) kind of object.
2. there are "primitive" arrays and such containing references to objects. of course - and i imagine why - they are treated differently by the VM.
3. then both are - somehow - subclasses of Object. whereas primitive types are not really, primitive-arrays are. this is hidden to the programmer....
4. any array can be "pointed" at via local Object variable, like this:
Object xyz = new int[6];
5. arrays of Objects (with different dimensions) can be casted, like this:
Object pointer = null;
Object[]   o = new SomeClass[42] ;
Object[][] oo = new OtherClass[23] [2] ;
Object[][][] ooo = new OtherClass[23] [2] [9] ;
o = oo = ooo;     // this is save to do,
                               //because "n-dimensional" object-arrays
                              // are just arrays of other arrays, down to simple array
pointer = o;         // ok, we are referencing o via Object "pointer"6. but, you cannot do this with primitive types:
int[] i1 = new int [99] ;
int[][] i2 = new int [1] [3] ;
i1 = i2                  // terror: impossible. this is awful, if you ask me.
                               // ok, one could talk about "special cases" and
                               // "the way the VM works", but this is not of interest to me as
                               // a programmer. i'm not happy with that array-mess!
pointer = i2;       // now this is completely legal. i2, i1 etc is an object!7. after the preparation, let's get into my main trouble (you have the answer, i know!) :
suppose i have a class, with methods that should process ANY kind of object given. and - i don't know which. i only get it at runtime from an unknown source.
let's say: public void BlackBox( Object x );
inside, i know that there might be regular objects or arrays, and for this case i have some special hidden method, just for arrays... now try to find it out:
public void BlackBox( Object x )
if ( x == null)
       return;
   Class c = x.getClass();
   if ( c.isArray() )
          // call the array method if it's an array.........
          BlackBoxes(     (Object [] ) x );         // wait: this is a cast! and it WILL throw an exception, eventually!
          return;
   else
           DoSpecialStuffWith( x );
}ok ? now, to process any kind of array, the special method you cannot reach from outside:
private void BlackBoxes( Object[] xs )
   if ( xs != null )
        for ( Object x : xs )
             BlackBox( x );
// this will end up in some kind of recursion with more than one array-dimension, or when an Object[] has any other array as element!this approach is perfectly save when processing any (real) Object, array or "multi-dimensional" arrays of Objects.
but, you cannot use this with primitive type arrays.
using generics wouldn't help, because internally it is all downcasted to Object.
BlackBox( new Integer(3) ) ---- does work, using a wrapper class
BlackBox( new Integer[3] ) ----- yep!
BlackBox( 3 ) ---- even this!
BlackBox( new int[42] ) ---- bang! ClassCastException, Object[] != int[]
i'm stuck. i see no way to do this smoothly. i could write thousands of methods for each primitive array - BlackBox( int[] is ) etc. - but this wouldn't help. because i can't cast an int[][] to int[], i would also have to write countless methods for each dimension. and guess, how much there are?
suppose, i ultimately wrote thousands of possible primitive-type methods. it would be easy to undergo any of it, writing this:
BlackBox( (Object) new int[9] [9] );
the method-signature would again only fit to my first method, so the whole work is useless. i CAN cast an int[] to Object, but there seems no convenient way to get the real array out of Object - in a generic way.
i wonder, how do you write a serialisation-engine? and NO, i can't rely on "right usage" of my classes, i must assume the worst case...
any help appreciated!

thanks, brigand!
your code looks weird to me g and i think there's at least one false assumption: .length of a multidimensional array returns only the number of "top-level" subarrays. that means, every length of every subarray may vary. ;)
well i guess i figured it out, in some way:
an int is no Object;
int[ ] is an Object
the ComponentType of int [ ] is int
so, the ComponentType of an Object int[ ] is no Object, thus it cannot be casted to Object.
but the ComponentType of int [ ] [ ] IS Object, because it is int [ ] !
so every method which expects Object[], will work fine with int[ ] [ ] !!
now, you only need special treatment for 1-dimensional primitive arrays:
i wrote some code, which prints me everything of everything:
    //this method generates tabs for indentation
    static String Pre( int depth)
         StringBuilder pre = new StringBuilder();
         for ( int i = 0; i < depth; i++)
              pre.append( "\t" );
         return pre.toString();
    //top-level acces for any Object
    static void Print( Object t)
         Print ( t, 0);
    //the same, but with indentation depth
    static void Print( Object t, int depth)
        if ( t != null )
             //be shure it is treated exactly as the class it represents, not any downcast
             t = t.getClass().cast( t );
            if ( t.getClass().isArray() )
                 //special treatment for int[]
                 if ( t instanceof int[])
                      Print( (int[]) t, depth);
                 // everything else can be Object[] !
                 else
                      Print( (Object[]) t, depth );
                 return;
            else
                System.out.println( Pre(depth) + " [ single object:] " + t.toString() );
        else
            System.out.println( Pre(depth) + "[null!]");
    // now top-level print for any array of Objects
    static void Print( Object [] o)
         Print( o, 0 );
    // the same with indentation
    static void Print( Object [] o, int depth)
        System.out.println( Pre(depth) + "array object " + o.toString() );
        for ( Object so : o )
                Print( so, depth + 1 );
    //the last 2 methods are only for int[] !
    static void Print( int[] is)
         Print( is, 0 );
    static void Print( int[] is, int depth)
        System.out.println( Pre(depth) + "primitive array object " + is.toString() );
        // use the same one-Object method as every other Object!
        for ( int i : is)
             Print ( i, depth + 1 );
        System.out.println( "-----------------------------" );
    }now, calling it with
Print ( (int) 4 );
Print ( new int[] {1,2,3} );
Print( new int[][] {{1,2,3}, {4,5,6}} );
Print( new int[][][] {{{1,2,3}, {4,5,6}} , {{7,8,9}, {10,11,12}}, {{13,14,15}, {16,17,18}} } );
Print( (Object) (new int[][][][] {{{{99}}}} ) );
produces this fine array-tree:
[ single object:] 4
primitive array object [I@9cab16
      [ single object:] 1
      [ single object:] 2
      [ single object:] 3
array object [[I@1a46e30
     primitive array object [I@3e25a5
           [ single object:] 1
           [ single object:] 2
           [ single object:] 3
     primitive array object [I@19821f
           [ single object:] 4
           [ single object:] 5
           [ single object:] 6
array object [[[I@addbf1
     array object [[I@42e816
          primitive array object [I@9304b1
                [ single object:] 1
                [ single object:] 2
                [ single object:] 3
          primitive array object [I@190d11
                [ single object:] 4
                [ single object:] 5
                [ single object:] 6
     array object [[I@a90653
          primitive array object [I@de6ced
                [ single object:] 7
                [ single object:] 8
                [ single object:] 9
          primitive array object [I@c17164
                [ single object:] 10
                [ single object:] 11
                [ single object:] 12
     array object [[I@1fb8ee3
          primitive array object [I@61de33
                [ single object:] 13
                [ single object:] 14
                [ single object:] 15
          primitive array object [I@14318bb
                [ single object:] 16
                [ single object:] 17
                [ single object:] 18
array object [[[[I@ca0b6
     array object [[[I@10b30a7
          array object [[I@1a758cb
               primitive array object [I@1b67f74
                     [ single object:] 99
-----------------------------and i'll have to write 8 methods or so for every primitive[ ] type !
sounds like a manageable effort... ;-)

How to set the screen size with nested Iview screen

Can someone show me how to set the screen size with nested IView screen.
at the moment i only try it with trial and error untill it looks somewhat close. Is there a property in VC to set the size for Height and width.
The same question is for the form. the form elements inside the form is easy but the actual form is still a challenge.

Hi,
Yes you are correct ,Still the Form and iview are not able to change thier Layout Structure using a Propery.
it is available with VC7.1
Govindu

UnmarshalException with nested EOFException on Naming.lookup()

I have an RMI server object that creates its own RMI registry and binds, like this:
     Registry registry = LocateRegistry.createRegistry(1099);
     registry.bind("JournalReceiver", this);I run this from the command line to get it started. Everything looks good.
My client is running as a webapp in Tomcat (on the same machine), and it executes this call:
        receiver = (RmiJournalReceiverInterface) Naming.lookup("JournalReceiver");and gets this error
java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
     java.io.EOFException
     at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
     at java.rmi.Naming.lookup(Naming.java:84)It is clear that I'm reaching the registry, and if I modify the code to intentionally lookup the wrong name I get a "not bound error", so I'm pretty confident that my server object is indeed bound to that name. Beyond that, I'm lost.
Any thoughts?
jb

OK - the problem was an incorrect codebase.
My server object creates its own registry with
       Registry registry = LocateRegistry.createRegistry(1099);
     registry.bind("JournalReceiver", this);and I get the UnmarshalException with nested EOFException, as shown above.
However, if I set up an outside registry with 'rmiregistry', and use
        Naming.rebind("JournalReceiver", this)then I get the UnmarshalException with nested ClassNotFoundException, which has shown up in several threads.
So, following the advice given in those threads, I fix the codebase like this:
java -Djava.rmi.server.codebase=file:/var/local/jb/RmiReceiver.jar \
   org.nsdl.RmiJournalReceiverand it works as advertised, even when I go back to my original lines of binding code.
Thanks again for the help.
jb

Import tables with nested table : ORA-00600

In Oracle 9.2
Create object, type as table, and table with nested table (store as syms_ntab) are successfully.
Also its export.
In process of import on another server (also 9.2, 'fromuser=one touser=two') shows errors:
. . importing table "SYMS_NTAB"
IMP-00058: ORACLE error 600 encountered
ORA-00600: internal error code, arguments: [kokeeafi1], [2], [2], [], [], [], [], []
IMP-00075: Warning: The nested table may contain partial rows or duplicate rows
But for all that table is created and error occur on phase inserting strings.
What is this?
In Oracle 8.0.5 i perform similar operation without error.

From Oracle error messages and codes manual:
ORA-00600 internal error code, arguments: [string], [string], [string], [string], [string], [string], [string], [string]
Cause: This is the generic internal error number for Oracle program exceptions. It indicates that a process has encountered a low-level, unexpected condition. Causes of this message include:
* timeouts
* file corruption
* failed data checks in memory
* hardware, memory, or I/O errors
* incorrectly restored files
The first argument is the internal message number. Other arguments are various numbers, names, and character strings. The numbers may change meanings between different versions of Oracle.
Action: Report this error to Oracle Support Services after gathering the following information:
* events that led up to the error
* the operations that were attempted that led to the error
* the conditions of the operating system and databases at the time of the error
* any unusual circumstances that occurred before receiving the ORA-00600 message
* contents of any trace files generated by the error
* the relevant portions of the Alter files
Note: The cause of this message may manifest itself as different errors at different times. Be aware of the history of errors that occurred before this internal error.

Change properties of a cluster element withing an array of clusters

Hello all,
I have an array of cluster that is shaped as a line with different display elements.
A list or a tree wouldn't have made it, so I had to use a cluster and make a table.
The problem is that I want to change not only the text but also the text color.
Individually.
I found this :
http://www.ni.com/example/30904/en/
But it change the property in all the clusters in the array, not just the one I need.
Some people have the same problem :
http://forums.ni.com/t5/LabVIEW/Reference-to-Array-of-Clusters-with-an-array-element/td-p/1006427
http://forums.ni.com/t5/LabVIEW/Different-set-of-values-for-two-rings-in-an-array-of-clusters/m-p/10...
http://forums.ni.com/t5/LabVIEW/array-of-clusters-get-references-to-all-the-clusters/td-p/1079456
http://forums.ni.com/t5/LabVIEW/How-can-I-reference-the-properties-of-a-control-in-a-cluster-in/m-p/...
http://forums.ni.com/t5/LabVIEW/Writing-only-to-certain-cluster-elements-in-an-array-by/m-p/2200728
http://forums.ni.com/t5/LabVIEW/Update-Properties-Of-One-Control-In-An-Array/m-p/3015501
http://forums.ni.com/t5/LabVIEW/Array-of-clusters-and-in-the-cluster-is-a-bar-meter-how-can-I/m-p/15...
http://forums.ni.com/t5/LabVIEW/Property-node-of-a-control-inside-of-cluster-inside-an-array/m-p/946...
Obviously, while in a list/table or tree you can change the property of an individual
cell (font, color) you cannot do it within an array of cluster, by some sort of magic,
the property of a cluster element (font, color) are all linked together, hence rendering
the use of an array worthless.
A possible hack is proprosed by using control masking, setting one visible and the
other invisble, swapping their position, whatever. It's a hack you have to perform,
hence add another code to maintain.
Is that still the case or is there now a more official way to handle individual cluster
properties, not just its data ? After all that's a common real-life example that should
be handled by Labview. In my opinion.
David Koch
Solved!
Go to Solution.

altenbach wrote:
One of the elements could be a 2D picture indicator of about the same size. You can write text in any color using picture functions.
Here's what I had in mind. Seems to work just fine (I would fine-tune the font, picture border, etc. but this should get you started).
LabVIEW Champion . Do more with less code and in less time .
Attachments:
ColorText.png ‏13 KB
ColorText.vi ‏9 KB

Query rewrites with Nested materialized views with different aggregations

Platform used : Oracle 11g.
Here is a simple fact table (with measures m1,m2) and dimensions (a) Location (b) Calendar and (c) Product. The business problem is that aggregation operator for measure m1,m2 are different along location dimension and Calendar dimension. The intention is to preaggregate the measures for a product along the calendar dimension and Location dimension and store it as materialized views.
The direct option is to define a materialized view with Inline queries (Because of the different aggrergation operator, it is not possible to write a query without Inline query). http://download-uk.oracle.com/docs/cd/B28359_01/server.111/b28313/qradv.htm#BABEAJBF documents the limitations that it works only for 'Text match' and 'Equivalent queries' and that is too limiting.
So decided to have nested materialized view, with first view having just joins(my_dim_mvw_joins), the second view having aggregations along Calendar dimension (my_dim_mvw_calendar) and third view having aggregations along the Location dimension(my_dim_mvw_location). Obviously I do not want the query I fire to know about materialized views and I fire it against the fact table. I see that for the fired query (Which needs aggregations along both Calendar and Location), is rewritten with just second materialized view but not the third. (Had set QUERY_REWRITE_INTEGRITY as TRUSTED) .
Wanted to know whether there are limitations on Query Writes with nested materialized views? Thanks
(Have given a simple testable example below. Pls ignore the values given in 'CALENDAR_IDs', 'PRODUCT_IDs' etc as they are the same for all the queries)
-- Calendar hierarchy table
CREATE TABLE CALENDAR_HIERARCHY_TREE
(     "CALENDAR_ID" NUMBER(5,0) NOT NULL ENABLE,
"HIERARCHY1_ID" NUMBER(5,0),
"HIERARCHY2_ID" NUMBER(5,0),
"HIERARCHY3_ID" NUMBER(5,0),
"HIERARCHY4_ID" NUMBER(5,0),
CONSTRAINT "CALENDAR_HIERARCHY_TREE_PK" PRIMARY KEY ("CALENDAR_ID")
-- Location hierarchy table
CREATE TABLE LOCATION_HIERARCHY_TREE
(     "LOCATION_ID" NUMBER(3,0) NOT NULL ENABLE,
"HIERARCHY1_ID" NUMBER(3,0),
"HIERARCHY2_ID" NUMBER(3,0),
"HIERARCHY3_ID" NUMBER(3,0),
"HIERARCHY4_ID" NUMBER(3,0),
CONSTRAINT "LOCATION_HIERARCHY_TREE_PK" PRIMARY KEY ("LOCATION_ID")
-- Product hierarchy table
CREATE TABLE PRODUCT_HIERARCHY_TREE
(     "PRODUCT_ID" NUMBER(3,0) NOT NULL ENABLE,
     "HIERARCHY1_ID" NUMBER(3,0),
     "HIERARCHY2_ID" NUMBER(3,0),
     "HIERARCHY3_ID" NUMBER(3,0),
     "HIERARCHY4_ID" NUMBER(3,0),
     "HIERARCHY5_ID" NUMBER(3,0),
     "HIERARCHY6_ID" NUMBER(3,0),
     CONSTRAINT "PRODUCT_HIERARCHY_TREE_PK" PRIMARY KEY ("PRODUCT_ID")
-- Fact table
CREATE TABLE RETAILER_SALES_TBL
(     "PRODUCT_ID" NUMBER,
"PRODUCT_KEY" VARCHAR2(50 BYTE),
"PLAN_ID" NUMBER,
"PLAN_PERIOD_ID" NUMBER,
"PERIOD_ID" NUMBER(5,0),
"M1" NUMBER,
"M2" NUMBER,
"M3" NUMBER,
"M4" NUMBER,
"M5" NUMBER,
"M6" NUMBER,
"M7" NUMBER,
"M8" NUMBER,
"LOCATION_ID" NUMBER(3,0),
"M9" NUMBER,
CONSTRAINT "RETAILER_SALES_TBL_LOCATI_FK1" FOREIGN KEY ("LOCATION_ID")
REFERENCES LOCATION_HIERARCHY_TREE ("LOCATION_ID") ENABLE,
CONSTRAINT "RETAILER_SALES_TBL_PRODUC_FK1" FOREIGN KEY ("PRODUCT_ID")
REFERENCES PRODUCT_HIERARCHY_TREE ("PRODUCT_ID") ENABLE,
CONSTRAINT "RETAILER_SALES_TBL_CALEND_FK1" FOREIGN KEY ("PERIOD_ID")
REFERENCES CALENDAR_HIERARCHY_TREE ("CALENDAR_ID") ENABLE
-- Location dimension definition to promote query rewrite
create DIMENSION LOCATION_DIM
LEVEL CHAIN IS LOCATION_HIERARCHY_TREE.HIERARCHY1_ID
LEVEL CONSUMER_SEGMENT IS LOCATION_HIERARCHY_TREE.HIERARCHY3_ID
LEVEL STORE IS LOCATION_HIERARCHY_TREE.LOCATION_ID
LEVEL TRADING_AREA IS LOCATION_HIERARCHY_TREE.HIERARCHY2_ID
HIERARCHY PROD_ROLLUP (
STORE CHILD OF
CONSUMER_SEGMENT CHILD OF
TRADING_AREA CHILD OF
CHAIN
-- Calendar dimension definition
create DIMENSION CALENDAR_DIM
LEVEL MONTH IS CALENDAR_HIERARCHY_TREE.HIERARCHY3_ID
LEVEL QUARTER IS CALENDAR_HIERARCHY_TREE.HIERARCHY2_ID
LEVEL WEEK IS CALENDAR_HIERARCHY_TREE.CALENDAR_ID
LEVEL YEAR IS CALENDAR_HIERARCHY_TREE.HIERARCHY1_ID
HIERARCHY CALENDAR_ROLLUP (
WEEK CHILD OF
MONTH CHILD OF
QUARTER CHILD OF
YEAR
-- Materialized view with just joins needed for other views
CREATE MATERIALIZED VIEW my_dim_mvw_joins build immediate refresh complete enable query rewrite as
select product_id, lht.HIERARCHY1_ID, lht.HIERARCHY2_ID, lht.HIERARCHY3_ID, lht.location_id, cht.HIERARCHY1_ID year,
cht.HIERARCHY2_ID quarter, cht.HIERARCHY3_ID month, cht.calendar_id week, m1, m3, m7, m9
from retailer_sales_tbl RS, calendar_hierarchy_tree cht, location_hierarchy_tree lht
WHERE RS.period_id = cht.CALENDAR_ID
and RS.location_id = lht.location_id
and cht.CALENDAR_ID in (10,236,237,238,239,608,609,610,611,612,613,614,615,616,617,618,619,1426,1427,1428,1429,1430,1431,1432,1433,1434,1435,1436,1437,1438,1439,1440,1441,1442,1443,1444,1445,1446,1447,1448,1449,1450,1451,1452,1453,1454,1455,1456,1457,1458,1459,1460,1461,1462,1463,1464,1465,1466,1467,1468,1469,1470,1471,1472,1473,1474,1475,1476,1477)
AND product_id IN (5, 6, 7, 8, 11, 12, 13, 14, 17, 18, 19, 20)
AND lht.location_id IN (2, 3, 11, 12, 13, 14, 15, 4, 16, 17, 18, 19, 20)
-- Materialized view which aggregate along calendar dimension
CREATE MATERIALIZED VIEW my_dim_mvw_calendar build immediate refresh complete enable query rewrite as
select product_id, HIERARCHY1_ID , HIERARCHY2_ID , HIERARCHY3_ID ,location_id, year, quarter, month, week,
sum(m1) m1_total, sum(m3) m3_total, sum(m7) m7_total, sum(m9) m9_total,
GROUPING_ID(product_id, location_id, year, quarter, month, week) dim_mvw_gid
from my_dim_mvw_joins
GROUP BY product_id, HIERARCHY1_ID , HIERARCHY2_ID , HIERARCHY3_ID , location_id,
rollup (year, quarter, month, week);
-- Materialized view which aggregate along Location dimension
CREATE MATERIALIZED VIEW my_dim_mvw_location build immediate refresh complete enable query rewrite as
select product_id, year, quarter, month, week, HIERARCHY1_ID, HIERARCHY2_ID, HIERARCHY3_ID, location_id,
sum(m1_total) m1_total_1, sum(m3_total) m3_total_1, sum(m7_total) m7_total_1, sum(m9_total) m9_total_1,
GROUPING_ID(product_id, HIERARCHY1_ID, HIERARCHY2_ID, HIERARCHY3_ID, location_id, year, quarter, month, week) dim_mvw_gid
from my_dim_mvw_calendar
GROUP BY product_id, year, quarter, month, week,
rollup (HIERARCHY1_ID, HIERARCHY2_ID, HIERARCHY3_ID, location_id)
-- SQL Query Fired (for simplicity have used SUM as aggregation operator for both, but they will be different)
select product_id, year, HIERARCHY1_ID, HIERARCHY2_ID,
sum(m1_total) m1_total_1, sum(m3_total) m3_total_1, sum(m7_total) m7_total_1, sum(m9_total) m9_total_1
from
select product_id, HIERARCHY1_ID , HIERARCHY2_ID , year,
sum(m1) m1_total, sum(m3) m3_total, sum(m7) m7_total, sum(m9) m9_total
from
select product_id, lht.HIERARCHY1_ID , lht.HIERARCHY2_ID , lht.HIERARCHY3_ID ,lht.location_id, cht.HIERARCHY1_ID year, cht.HIERARCHY2_ID quarter, cht.HIERARCHY3_ID month, cht.calendar_id week,m1,m3,m7,m9
from
retailer_sales_tbl RS, calendar_hierarchy_tree cht, location_hierarchy_tree lht
WHERE RS.period_id = cht.CALENDAR_ID
and RS.location_id = lht.location_id
and cht.CALENDAR_ID in (10,236,237,238,239,608,609,610,611,612,613,614,615,616,617,618,619,1426,1427,1428,1429,1430,1431,1432,1433,1434,1435,1436,1437,1438,1439,1440,1441,1442,1443,1444,1445,1446,1447,1448,1449,1450,1451,1452,1453,1454,1455,1456,1457,1458,1459,1460,1461,1462,1463,1464,1465,1466,1467,1468,1469,1470,1471,1472,1473,1474,1475,1476,1477)
AND product_id IN (5, 6, 7, 8, 11, 12, 13, 14, 17, 18, 19, 20)
AND lht.location_id IN (2, 3, 11, 12, 13, 14, 15, 4, 16, 17, 18, 19, 20)
GROUP BY product_id, HIERARCHY1_ID , HIERARCHY2_ID , HIERARCHY3_ID , location_id, year
) sales_time
GROUP BY product_id, year,HIERARCHY1_ID, HIERARCHY2_ID
This Query rewrites only with my_dim_mvw_calendar. (as saw in Query Plan and EXPLAIN_MVIEW). But we would like it to use my_dim_mvw_location as that has aggregations for both dimensions.

blackhole001 wrote:
Hi all,
I'm trying to make my programmer's life easier by creating a database view for them to query the data, so they don't have to worry about joining tables. This sounds like a pretty horrible idea. I say this because you will eventually end up with programmers that know nothing about your data model and how to properly interact with it.
Additionally, what you will get is a developer that takes one of your views and see's that of the 20 columns in it, it has 4 that he needs. If all those 4 columns comes from a simple 2 table join, but the view has 8 tables, you're wasting a tonne of resources by using the view (and heaven forbid they have to join that view to another view to get 4 of the 20 columns from that other view as well).
Ideally you'd write stored routines that satisfy exactly what is required (if you are the database resource and these other programmers are java, .net, etc... based) and the front end developers would call those routines customized for an exact purpose.
Creating views is not bad, but it's by no means a proper solution to having developers not learn or understand SQL and/or the data model.

KVO with nested arrays?

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