Converting ResultSet to Multi Dim Array
Can anyone tell me an easy way of converting a ResultSet to a Multi-Dimensional array
Thanks Gary
convert it to a vector of vectors
then convert the vector of vectors to a 2 dimensional array (array of arrays).
you should be able to get the code to convert a vector of
vectors into a 2 dim array from the web site.
Similar Messages
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How do I find the total number of elements in a multi dim array
How do I find the total number of elements in a single or multi dim array?
For example, a 2x3 array has 6 elements, and a 2x3x4 has 24. How do I compute this very easily - is there a single VI that does this?
David
Solved!
Go to Solution.Use "array size" (array palette) followed by "multiply array elements" (numeric palette)
(Works also equally well for 3D arrays and higher)
For a 1D array, just use "array size".
Message Edited by altenbach on 02-05-2009 05:57 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
NumberOfElements.png 3 KB -
Better way to sort multi dim int array
I'm tracking key value pairs of ints. I know that the keys will not repeat. I've decided to do this in an int[][] array
int[][] data = new int[2][many millions]This app crunches a lot of data so I'm shooting for the best memory handling. I push a bunch of key - value pairs into the array. I will likely populate many if not all data and not have to search until I'm done populating so I'm not sorting as I go.
I know that I can sort the single dim array data[0] but how can I keep the values array data[1] synchronized? I've tried a few things, all have been successful but I'm wondering if there's a better method. Currently I create copy arrays for the keys and values, sort the original keys, and loop through the copy keys. For each copy key I binary search the sorted keys and drop the value in the correct spot. I don't like having to allocate 2X the amount of memory for the swap arrays. Any thoughts?
Thanks
STJos, thanks for the reply. I tried this method but I don't get as much
storage since each internal array counts as an object.Yes I know; maybe I've got something for you, waidaminnit <dig-dig/>
<shuffle-shuffle/> Ah, got it. Suppose you wrap your two dim array in
a simple class that implements this interface:public interface Sortable {
public int length();
public int compare(int i, int j);
public void swap(int i, int j);
}I think the semantics of the methods are obvious. Given this interface
you can sort anything you like using this thingy:public class HeapSort {
private Sortable s;
private void heapify(int i, int n) {
for (int r, l= (i<<1)+1; l < n; i= l, l= (i<<1)+1) {
if ((r= l+1) < n && s.compare(l, r) < 0) l= r;
if (s.compare(i, l) < 0) s.swap(i, l);
private void phase1() {
for (int n= s.length(), i= n/2; i >= 0; i--)
heapify(i, n);
private void phase2() {
for (int n= s.length(); --n > 0; ) {
s.swap(0, n);
heapify(0, n);
public HeapSort(Sortable s) { this.s= s; }
public Sortable sort() {
phase1();
phase2();
return s;
}kind regards,
Jos -
Best practice in JSTL with multi-dimensional arrays
Hi,
I'm working in a project and I'm trying to convert some code into JSTL way, I have a first.jsp that calls addField(String, String) from fieldControl.jsp:
(first.jsp)
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@ include file="fieldControl.jsp" %>
<html>
<head><title>JSP Page</title></head>
<body>
<%! String[][] list1;
%>
<%
list1 = new String[2][2];
list1[0][0]="first_1";
list1[0][1]="first_2";
list1[1][0]="second_1";
list1[1][1]="second_2";
for (int i=0;i<list1.length;i++){
String html;
html = addField (list1[0], list1[i][1]);
out.println(html);
%>
</body>
</html>
(fieldControl.jsp)
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@ page language="java" %>
<%! public void addField(String name,String label)
return ...
Now for JSTL I've this example from "JSTL pratical guide for JSP programmers" Sue Spielman:
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<html>
<head>
<title>
Display Results
</title>
</head>
<body>
<%-- Create a HashMap so we can add some values to it --%>
<jsp:useBean id="hash" class="java.util.HashMap" />
<%-- Add some values, so that we can loop over them --%>
<%
hash.put("apples","pie");
hash.put("oranges","juice");
hash.put("plums","pudding");
hash.put("peaches","jam");
%>
<br>
<c:forEach var="item" items="${hash}">
I like to use <c:out value="${item.key}" /> to make <c:out value="${hash[item.key]}" />
<br>
<br>
</c:forEach>
</body>
</html>
and my problem is :
1st - how to use the multi-dimensional array in this way (<jsp:useBean id="hash" class="java.util.HashMap" />) ? because if I use it like this
<% String[][] list1;
list1 = new String[2][2];
list1[0][0]="first_1";
list1[0][1]="first_1";
list1[1][0]="second_1";
list1[1][1]="second_2";%>
<c:out value="${list1}" />
<c:out value="${list1.lenght}" />
I get nothing,
also tryed <c:set var="test" value="<%=list1.length%>" /> and got "According to TLD or attribute directive in tag file, attribute value does not accept any expressions"
2nd hot to make the call to the method addField?
Thanks for any help, I really want to make this project using JSTL, PVWhen you are using JSTL, it is best to not put data inside the JSP. Put it inside JavaBeans. Then make calles to the methods in those JavaBeans.
So you should get used to JavaBeans and their requirenments.
Access JavaBeans only through 2 types of methods: getters and setters.
Getters are used to "get" values (properties) from the bean, and always have the form
public Type getPropertyName(void)
That is, they are public, return some value, start with the exact string "get" end with the name of the property (first letter of the property name capitalized) and have a void (empty) argument list.
For example, this is a good signature to get HTML from a bean:
public String getHtml()
Setters are used to assign values to a bean. They always have the form
public void setPropertyName(Type value)
That is, they are public, do not return anything, start with the string "set", end with the name of the property (first letter capitalized), and take a SINGLE parameter.
public void setHtml(String value)
Also, JavaBeans must have a no argument constructor and need to be Serializable.
The way I would approach this would be to create a JavaBean that holds the two dim array for you, and has a getter that returns a list of all the formatted html.
package mypack;
import java.util.List;
import java.util.ArrayList;
public class DataFormatterBean implement java.io.Serializable {
private String[][] list;
public DataFormatterBean() {
list = new String[2][2];
list[0][0]="first_1";
list[0][1]="first_2";
list[1][0]="second_1";
list[1][1]="second_2";
public List getHtml() {
List outputHtml = new ArrayList(list.length);
for (int i = 0; i < list.length; i++) {
String html = addField(list[0], list[i][1]);
outputHtml.add(html);
return outputHtml;
private addField(String a, String b) { .. do work .. }
Then, the JSP would look like this:
<jsp:useBean id="dataFormatter" class="mypack.DataFormatterBean"/>
<c:forEach var="htmlString" items="${dataFormatter.html}">
<c:out value="${htmlString}"/>
</c:forEach>Once you start thinking in terms of having JavaBeans do your work for you JSTL is so much easier... and it gets even easier when you start to delve into custom tags. -
Populating ADF Table from Multi-Dimensional Array
Hello!
I'm trying to populate an ADF table from a multi-dimensional array.
Let's say that my array is
String [] [] myArr = new String [3][5].
On my page backing bean, I have a private attribute called tmpArr like this...
String [] [] tmpArr;
...which I will initialize later after I know the proper dimensions. The dimensions will come from a multimap that contains a key and and another array (for the key's value) containing values for the key. So once I know the dimensions I initialize my array with...
tmpArr = new String [x][y] where x and y are the dimensions (counters).
Now I have my multidimension array. On an jsp page I have an ADF table, and I'm setting the value for the table to the array (the table's value property is bound to the backing bean's tmpArr attribure).
Like so:
<af:panelForm id="availableOptions"
binding="#{myBackingBean.availableOptionsValues}">
<af:table emptyText="No items were found" rows="10"
value="#{myBackingBean.tmpArr}" var='myArr'>
Now I need to know how to do the following:
1) Set the table's columns based on the number of attributes on the array.
2) Set the table's rows based on the array's length.
3) Set each table cell value to values on the array's 2nd dimension. I'm assuming that ADF takes care iterating through the array, and that I should do something like...
<af:outputText value="#{myArr[][0]}"/>
<af:outputText value="#{myArr[][1]}"/>
etc...
However, this isn't working...
javax.faces.el.ReferenceSyntaxException: myArr[][0]
...bla bla bla...
Was expecting one of:
<INTEGER_LITERAL> ...
<FLOATING_POINT_LITERAL> ...
<STRING_LITERAL> ...
"true" ...
"false" ...
"null" ...
"not" ...
"empty" ...
<IDENTIFIER> ...
Is there a blog or resource (article, book, etc) that shows how this is done? Anyone has done this and would like to share how?
Thank you.This is in fact possible. I'm not sure about the "best practice" around doing this but there is a couple of ways to do this.
You can either create a managed bean then right click on it and use the wizard to create a data control or you can do it as per below
The a table will convert an array into a collection.
Once you have created an array and generated the accessors in a bean you can then reference the mutli-dimensional array from a table as per below.
<af:table value="#{pageFlowScope.PageBean.sessionArr}" var="row" rowBandingInterval="0" id="t1" varStatus="status">
<af:column sortable="false" headerText="col1" id="c1">
<af:outputText value="#{pageFlowScope.PageBean.sessionArr[status.index][0]}" id="ot1"/>
</af:column>
</af:table>
String [][] sessionArr = new String[5][2];
public void setSessionArr(String[][] sessionArr) {
this.sessionArr = sessionArr;
public String[][] getSessionArr() {
sessionArr[0][0]="rice";
sessionArr[1][0]="water";
return sessionArr;
EDIT: For either of the above methods the managed bean must have a scope of pageFlow or longer.
Cheers,
Aaron
Edited by: Aaron Rapp on Oct 6, 2011 3:28 PM -
How to convert ResultSet's value to String
Dear JDC's
plz tell me how to convert ResultSet's value to String.
kashifI want to read a whole array from a table into a String[]
and then send it to another servlet before I forward it all to anther servlet with request.setParameter.....
Any ideas how to solve it....that is how far I got so far:
rs=pgresult("select count (answer) from answers where qid="+idnum);
numberofquestions = rs.getInt("mynumber");
rs=pgresult("SELECT answer FROM answers WHERE qgroup="+qgroup);
allanswers = new String[numberofquestions];
allanswers = (String[])rs.getArray(1).getArray();
req.setParameter("allanswers",allanswers);
RequestDispatcher dispatcher = req.getRequestDispatcher("editanswers");
dispatcher.forward(req,res);
Tobi -
How can I (neatly) control mouse click events in a multi-dimensional array?
Hello everyone!
I have a question regarding the use of mouse clicks events in a multi-dimensional array (or a "2D" array as we refer to them in Java and C++).
Background
I have an array of objects each with a corresponding mouse click event. Each object is stored at a location ranging from [0][0] to [5][8] (hence a 9 x 6 grid) and has the specific column and row number associated with it as well (i.e. tile [2][4] has a row number of 2 and a column number of 4, even though it is on the third row, fifth column). Upon each mouse click, the tile that is selected is stored in a temporary array. The array is cleared if a tile is clicked that does not share a column or row value equal to, minus or plus 1 with the currently targeted tile (i.e. clicking tile [1][1] will clear the array if there aren't any tiles stored that have the row/column number
[0][0], [0][1], [0][2],
[1][0], [1][1], [1][2],
[2][0], [2][1], [2][2]
or any contiguous column/row with another tile stored in the array, meaning that the newly clicked tile only needs to be sharing a border with one of the tiles in the temp array but not necessarily with the last tile stored).
Question
What is a clean, tidy way of programming this in AS3? Here are a couple portions of my code (although the mouse click event isn't finished/working correctly):
public function tileClick(e:MouseEvent):void
var tile:Object = e.currentTarget;
tileSelect.push(uint(tile.currentFrameLabel));
selectArr.push(tile);
if (tile.select.visible == false)
tile.select.visible = true;
else
tile.select.visible = false;
for (var i:uint = 0; i < selectArr.length; i++)
if ((tile.rowN == selectArr[i].rowN - 1) ||
(tile.rowN == selectArr[i].rowN) ||
(tile.rowN == selectArr[i].rowN + 1))
if ((tile.colN == selectArr[i].colN - 1) ||
(tile.colN == selectArr[i].colN) ||
(tile.colN == selectArr[i].colN + 1))
trace("jackpot!" + i);
else
for (var ii:uint = 0; ii < 1; ii++)
for (var iii:uint = 0; iii < selectArr.length; iii++)
selectArr[iii].select.visible = false;
selectArr = [];
trace("Err!");Andrei1,
So are you saying that if I, rather than assigning a uint to the column and row number for each tile, just assigned a string to each one in the form "#_#" then I could actually just assign the "adjacent" array directly to it instead of using a generic object to hold those values? In this case, my click event would simply check the indexes, one at a time, of all tiles currently stored in my "selectArr" array against the column/row string in the currently selected tile. Am I correct so far? If I am then let's say that "selectArr" is currently holding five tile coordinates (the user has clicked on five adjacent tiles thus far) and a sixth one is being evaluated now:
Current "selectArr" values:
1_0
1_1, 2_1, 3_1
2_2
New tile clicked:
1_0
1_1, 2_1, 3_1
2_2
2_3
Coordinate search:
1_-1
0_0, 1_0, 2_0, 3_0
0_1, 1_1, 2_1, 3_1, 4_1
1_2, 2_2, 3_2
2_3
Essentially what is happening here is that the new tile is checking all four coordinates/indexes belonging to each of the five tiles stored in the "selectArr" array as it tries to find a match for one of its own (which it does for the tile at coordinate 2_2). Thus the new tile at coordinate 2_3 would be marked as valid and added to the "selectArr" array as we wait for the next tile to be clicked and validated. Is this correct? -
Assigning values to 2D Multi-Dimensional arrays ??
How do I assign a value to a Multi-dimensional 2D Array,
that has the righter array size omitted as it changes�.
Code�
SomeObj foobar = new SomeObj (first, second);
SomeObj [ ] [ ] d2D = new SomeObj [10] [ ];
d2D [0][0] = foobar; //Causes a null pointer exception�
NB: seems if I initiate �d2D = new SomeObj [10] [10];� with the righter array size initiated then the error doesn�t occur, but because of the nature of the data the size of each secondary array varies�
Thx. Kharsimapparently not...
from what i read up on Multi-Dimensional arrays, you only have to give a value to the leftest bracket...
e.g.
int [ 5 ] [ ] [ ] <~ Acceptable in Java
int [ 5 ] [ 6 ] [ ] <~ Acceptable in Java
int [ 5 ] [ 6 ] [ 24 ] <~ Acceptable in Java
int [ 5 ] [ ] [ 24 ] <~ Not acceptable in Java
so using arrays it should be possible to assign a value in either of the acceptable cases, but couldnt find a source that had such an example... -
How to populate multi-cluster arrays using matlab code?
Hi,
I have an array of clusters containing two 'Double' elements in each cluster. I am looking for a method to populate this array using MATLAB code. I need around 1000 clusters in the array, so populating it using the front panel is not practical. There is also some calculation involved in deciding the value in each element. If there is an example or a method to do this, please point me in the right direction.
Thanksaltenbach wrote:
Can you attach a typical file so we know that the structure is? It is easy to convert from any data structure to any other data structure. You could even read it as a 1D string array and parse each line into a cluster, for example. It all depends on how the fil is arranged. You could also read the file as a flat string and chop it up into the desired structure later.
I have attached the .vi file. I need to convert the spreadsheet to an array of clusters, thats where I'm getting stuck. (The vi is an example from help libraries)
That is the part where I need to change so that I can use a spreadsheet.
Attachments:
Buffered counter.vi 52 KB -
Hi, I would like to know how can i break the value for a row and column once i have converted the image to the array. I wanted to make some modification on the element of the array at a certain position. how can i do that?
At the moment (as per attachhment), the value of the new row and column will be inserted by the user. But now, I want to do some coding that will automatically insert the new value of the row and the column ( I will use the formula node for the programming). But the question now, I don't know how to split the row and the column. Is it the value of i in the 'for loop'? I've tried to link the 'i' to the input of the 'replace subset array icon' , but i'm unable to do it as i got some error.
Please help me!
For your information, I'm using LABView 7.0.Hi,
Thanks for your reply.Sorry for the confusion.
I manage to change the array element by changing the row and column value. But, what i want is to allow the program to change the array element at a specified row and column value, where the new value is generated automatically by the program.
Atatched is the diagram. I've detailed out the program . you may refer to the comments in the formula node. There are 2 arrays going into the loop. If a >3, then the program will switch to b, where if b =0, then the program will check on the value of the next element which is in the same row with b but in the next column. But if b =45, another set of checking will be done at a dufferent value of row and column.
I hope that I have made the problem clear. Sorry if it is still confusing.
Hope you can help me. Thank you!!!!
Attachments:
arrayrowncolumn2.JPG 64 KB -
Can I convert 3D image to an array of pixels in LabVIEW?
Hi all;
I am still new with labview. I has 1 question, can I convert 3D image to an array of pixels using labview?
Most of the examples I found they only convert 2D image. Hope anyone can give me some hint.
Thank Youlook at this thread.
It has links to other threads where the 3D graphs were used.
You should also search for "gif reader" to find threads where images are read from gif files.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction -
Converting ResultSet to XML by OracleXMLQuery
Hello,
I'm newbie in XML and I have following problem:
I'm using OracleXMLQuery to convert ResultSet from oracle db to XML document. I'm using getXMLDOM()(from oracle package) to convert this OracleXMLQuery into DOM representation. I can extract node names but all values of the nodes are null's (if I convert the document to string and put it on the screen, the values are connect). Here's my code:
QracleXMLQuery qry;
ResultSet rset = (ResultSet)stmt.getObject(1);
qry = new OracleXMLQuery(conn,rset);
qry.setRaiseNoRowsException(true);
qry.setRaiseException(true);
qry.keepObjectOpen(true);
qry.useNullAttributeIndicator(true);
Document d=(Document)qry.getXMLDOM();
//---to this point all seems to be correct
// -OracleXMLQuery object stores correct xml document and
// qry.getXMLDOM() return good Document object
NodeList nl=d.getElementsByTagName("some_tag_name");
for(int i=0;i<nl.getLength();i++){
Node temp=nl.item(i);
System.out.println(temp.getNodeValue()); //null's
System.out.println(temp.getNodeName()); //correct name of the string
}Maybe i'm missing something, as I wrote earlier I'm newbie in XML - I would be very grateful for any help. Thanks in advance!Thanks for your reply - it really helped. I have another problem,maybe some of you may help me: I have two DOM documents and I want to join then like this
Documant a:
<?xml version = '1.0'?>
<ROWSET>
<ROW num="1">
<attr1>sometext1</attr1>
<attr2>sometext2</attr2>
<attr3>sometext3</attr3>
</ROW>
<ROW num="2">
</ROW>
<ROW num="3">
</ROW>
</ROWSET>Doc b
<?xml version = '1.0'?>
<attrib>
<ROW num="1">
<atr1>sometext1</atr1>
<text>othertext1</text>
</ROW>
<ROW num="2">
<atr2>sometext2</atr2>
<text>othertext1</text>
</ROW>
<ROW num="3">
<atr3>sometext3</atr3>
<text>othertext1</text>
</ROW>
</attrib>Now I want to insert the whole <attrib>...</attrib> section from document b as a node to document a in for example <ROW num="1">...</ROW> section. I've tried to create Node element form document b (<attrib></attrib>) and use insertBefore() method on Node <ROW num="1"></ROW> but I have a nullpointer exception - well it probably wasn't good idea.I hope my description is clear, I vould be happy for any advice. Thanks in advance -
Converting XML String to MessageElement array
Hi,
I am trying to call a .NET web service from my Java client. I used WSDL2Java to generate the java classes for calling the .NET web service. The generated classes to call the service expects an array of org.apache.axis.message.MessageElement objects. I have a string representing an XML document which looks like this:
String xmlString = "<Results><Adjustments><Adjustment><RebuildAdjustmentID>16</RebuildAdjustmentID><IsBasicAdjustment>true</IsBasicAdjustment><AdjustmentType>stone/AdjustmentType><Title>External walls</Title></Adjustment></Adjustments></Results>"
I have tried converting the string into an array of MessageElement objects by the following way:
MessageElement[] m = new MessageElement[1];
Document XMLDoc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new InputSource(new StringReader(result2.toString())));
m[0] = XMLDoc.getDocumentElement();
However I keep getting the following message returned from the service:
"Object reference not set to an instance of an object"
I have tried a handful of ways but keep getting this same error. I have searched the web for hours looking for a solution to this problem without success so any help/ideas much appreciated,
Thanks.
PaulAny updates on this?
I am facing a similar problem. -
Use of multi-dimensional arrays in forms - forms debugger crash
Hello All readers,
have an issue with use of multi-dimensional arrays in forms when debugging and/or calling another form post array-population.
USING VERSIONS: oracle forms 9.0.4, Jinitiator 1.3.1.17, oracle db 10.1
the following code snippet works from a when-button-pressed trigger when called without the debugger. when called with the debugger it crashes when any element of the multi-dimensional associative array is accessed/populated/read. In addition, if i populate the multi-dimensional array then call a form (a msgbox form to display the arrays content as a string) it crashes too.
declare
type datasource_rec is record (field varchar2(32), val varchar2(3999));
type datasource_arr is table of datasource_rec index by binary_integer;
type datasource_arr_arr is table of datasource_arr index by binary_integer;
l_arr datasource_arr_arr;
procedure poparr(i_arr out datasource_arr_arr) is
idx binary_integer := 1;
iidx binary_integer := 1;
begin
while (idx <= 10) loop
iidx := 1;
while (iidx <= 10) loop
i_arr(idx)(iidx).field := 'field'||to_char(iidx)||':'||to_char(idx); --# debugger crashes here with JVM aborting... message (which crashes forms builder too)
i_arr(idx)(iidx).val := 'test value';
iidx := iidx+1;
end loop;
idx := idx+1;
end loop;
end;
procedure printarr is
idx binary_integer := l_arr.first;
iidx binary_integer;
l_msg varchar2(4000);
l_response pls_integer;
begin
while (idx is NOT null) loop
iidx := l_arr(idx).first;
while (iidx is NOT null) loop
l_msg := l_msg||chr(10)||l_arr(iidx)(idx).field||' = '||l_arr(iidx)(idx).val;
iidx := l_arr(idx).next(iidx);
end loop;
idx := l_arr.next(idx);
end loop;
alerts.info('see console for full printout: '||chr(10)||l_msg);
--l_response := msgbox.show(l_msg); --calls another modal form to display a long message, which crashes the runtime with a java console message*
r$debug.print(l_msg);
end;
begin
poparr(l_arr);
printarr;
end;
The java console does not print anything useful when both forms builder and the runtime crash/hangs as a result of the debugger being attached (except displaying a "JVM aborting" message) but when the runtime alone crashes as a result of calling another form after popping the MD array it prints:
oracle.forms.net.ConnectionException: Forms session <28> aborted: unable to communicate with runtime process.
at oracle.forms.net.ConnectionException.createConnectionException(Unknown Source)
at oracle.forms.net.HTTPNStream.getResponse(Unknown Source)
at oracle.forms.net.HTTPNStream.doFlush(Unknown Source)
at oracle.forms.net.HTTPNStream.flush(Unknown Source)
at java.io.DataOutputStream.flush(Unknown Source)
at oracle.forms.net.StreamMessageWriter.run(Unknown Source)
has anyone else encountered this problem and found a solution/workaround? is their some sort of memory limitation for forms-side handling of (multi-dimensional) arrays?+
many thanks
ps: i get similar problems when a) populating the array from a server/db-side packaged procedure (crashes with java console message as above even when not debugging) b) using server/db-side packaged types for the array.Hello All readers,
have an issue with use of multi-dimensional arrays in forms when debugging and/or calling another form post array-population.
USING VERSIONS: oracle forms 9.0.4, Jinitiator 1.3.1.17, oracle db 10.1
the following code snippet works from a when-button-pressed trigger when called without the debugger. when called with the debugger it crashes when any element of the multi-dimensional associative array is accessed/populated/read. In addition, if i populate the multi-dimensional array then call a form (a msgbox form to display the arrays content as a string) it crashes too.
declare
type datasource_rec is record (field varchar2(32), val varchar2(3999));
type datasource_arr is table of datasource_rec index by binary_integer;
type datasource_arr_arr is table of datasource_arr index by binary_integer;
l_arr datasource_arr_arr;
procedure poparr(i_arr out datasource_arr_arr) is
idx binary_integer := 1;
iidx binary_integer := 1;
begin
while (idx <= 10) loop
iidx := 1;
while (iidx <= 10) loop
i_arr(idx)(iidx).field := 'field'||to_char(iidx)||':'||to_char(idx); --# debugger crashes here with JVM aborting... message (which crashes forms builder too)
i_arr(idx)(iidx).val := 'test value';
iidx := iidx+1;
end loop;
idx := idx+1;
end loop;
end;
procedure printarr is
idx binary_integer := l_arr.first;
iidx binary_integer;
l_msg varchar2(4000);
l_response pls_integer;
begin
while (idx is NOT null) loop
iidx := l_arr(idx).first;
while (iidx is NOT null) loop
l_msg := l_msg||chr(10)||l_arr(iidx)(idx).field||' = '||l_arr(iidx)(idx).val;
iidx := l_arr(idx).next(iidx);
end loop;
idx := l_arr.next(idx);
end loop;
alerts.info('see console for full printout: '||chr(10)||l_msg);
--l_response := msgbox.show(l_msg); --calls another modal form to display a long message, which crashes the runtime with a java console message*
r$debug.print(l_msg);
end;
begin
poparr(l_arr);
printarr;
end;
The java console does not print anything useful when both forms builder and the runtime crash/hangs as a result of the debugger being attached (except displaying a "JVM aborting" message) but when the runtime alone crashes as a result of calling another form after popping the MD array it prints:
oracle.forms.net.ConnectionException: Forms session <28> aborted: unable to communicate with runtime process.
at oracle.forms.net.ConnectionException.createConnectionException(Unknown Source)
at oracle.forms.net.HTTPNStream.getResponse(Unknown Source)
at oracle.forms.net.HTTPNStream.doFlush(Unknown Source)
at oracle.forms.net.HTTPNStream.flush(Unknown Source)
at java.io.DataOutputStream.flush(Unknown Source)
at oracle.forms.net.StreamMessageWriter.run(Unknown Source)
has anyone else encountered this problem and found a solution/workaround? is their some sort of memory limitation for forms-side handling of (multi-dimensional) arrays?+
many thanks
ps: i get similar problems when a) populating the array from a server/db-side packaged procedure (crashes with java console message as above even when not debugging) b) using server/db-side packaged types for the array. -
Setting up a multi dimensional array of objects
Hey ya'll. How would i setup a multi dimensional array with this structure?
TypeSave(Title, material(name, quantity))
TypeSave[1](Lego Shop, material[1](Lego Blocks, 100))
material[2](Roof, 1))
TypeSave[2](Lego Car, material[1](Door, 2))
material[2](Gravy, 3, ounces))
TypeSave will be saved as a serialised object to a file so i can load everything within it and keep the structures integrity.
I'll have an add button that will add the name and quantity to the next empty position of "material" array. This will then be listed in a list box and allow me to save all the materials with a title to the TypeSave list in the next empty position.
I'm getting mightily confused how to set up the classes and the array structure :(
Any help would be greatly appreciated!private TypeSave t = new TypeSave();
private void btnSaveItemActionPerformed(java.awt.event.ActionEvent evt) {
t.addItem(txtItemTitle.getText(), new Material(txtMaterialName.getText(),txtQuantity.getText()));
t.saveToFile();
* @param args the command line arguments
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new MainForm().setVisible(true);
class Material implements Serializable {
String name = null;
String quantity = null;
//To restrict default constructor
private Material() {
public Material(String name, String quantity) {
this.name = name;
this.quantity = quantity;
public String getName() {
return this.name;
public String getQuantity() {
return this.quantity;
public String toString() {
return "Name : " + this.name + "Quantity : " + this.quantity;
class TypeSave implements Serializable {
private Hashtable items = null;
public TypeSave() {
items = new Hashtable();
public void addItem(String title,Material material) {
ArrayList materials = (ArrayList) items.get(title);
if(materials == null) {
materials = new ArrayList();
items.put(title,materials);
materials.add(material);
public Hashtable getItems() {
return this.items;
public ArrayList getItem(String title) {
return (ArrayList)this.items.get(title);
void saveToFile() {
ObjectOutputStream oos = null;
try
oos = new ObjectOutputStream(new FileOutputStream("item.ser"));
catch (IOException i)
System.out.println( "Error opening file");
try
oos.writeObject(items);
catch (IOException o)
System.out.println("Error writing file");
try
if(oos != null)
oos.close();
catch (IOException x)
System.out.println("Error closing file");
}My save class was working, but i tried to merge it to test this code structure and now it's failing with excepion:
"Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException"
any ideas?
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