Hashtable like data structure
I am just trying to find out if anyone knows of a data structure that is similar to a hashtable, with the exception that I need to be able to access a KEY given a VALUE, as well as the standard access of a VALUE given a KEY.
Hashtable only allows lookup by KEY, not VALUE.
Thanks, Jason
And not only that, Hashtable allows more than one key to have the same value. The simplest solution (not algorithm) for your problem is an object that wraps two Hashtables, one to handle the A->B mapping and the other to handle the B->A mapping.
Unless your mappings are not 1-to-1, such as if you had A,B and C,D and E,B in which case your value-to-key mapping for value B would somehow have to return both A and E.
Similar Messages
-
I'm trying to develop an application where I require 2 or more store equivalent objects. Each object has an id (int) used as part of the hashCode() and equals() methods. I would like to store all objects in a data structure that would allow to store and easily retrieved the concepts based on either id. I have thought about using TreeMap or Hashtable but those only allow the retrieval of element using the key.
In description logic, we can express statements, such as A := C, meaning that A and C are equivalent (i.e. the same object). I would like to keep track of these objects to reduce the number of iteration carried by the algorithm. If I store these elements in a java.util.Hashtable<K,V> then I'm only allowed to retrieve objects using the key (i.e. Hashtable.get(Object key)). However, I need to be able to retrieve elements either by keys or values depending on the task. For example, if I find C in another statement I would like to replace it by A and sometimes I need to use A to retrieve C.
-
Updating a hierarchical data structure from an entry processor
I have a tree-like data structure that I am attempting to update from an AbstractProcessor.
Imagine that one value is a collection of child value keys, and I want to add a new child node in the tree. This requires updating the parent node (which contains the list of child nodes), and adding the child value which is a separate entry.
I would rather not combine all bits of data into one value (which could make for a large serialized object), as sometimes I prefer to access (read-only) the child values directly. The child and the parent values live in the same partition in the partitioned cache, though, so get access should be local.
However, I am attempting to call put() on the same cache to add a child value which is apparently disallowed. It makes sense that a blocking call is involved in this operation, as it needs to push out this data to the cluster member that has the backup value for the same operation, but is there a general problem with performing any kind of re-entrant work on Coherence caches from an entry processor for any value that is not the value you are processing? I get the assertion below.
I am fine with the context blocking (preventing reads or writes on the parent node value) until the child completes, presuming that I handle deadlock prevention myself due to the order in which values are accessed.
Is there any way to do this, either with entry processors or not? My code previously used lock, get and put to operate on the tree (which worked), but I am trying to convert this code to use entry processors to be more efficient.
2008-12-05 16:05:34.450 (ERROR)[Coherence/Logger@9219882 3.4/405]: Assertion failed: poll() is a blocking call and cannot be called on the Service thread
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.poll(Grid.CDB:4)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.poll(Grid.CDB:11)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$BinaryMap.put(DistributedCache.CDB:30)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$BinaryMap.put(DistributedCache.CDB:1)
at com.tangosol.util.ConverterCollections$ConverterCacheMap.put(ConverterCollections.java:2433)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$ViewMap.put(DistributedCache.CDB:1)
at com.tangosol.coherence.component.util.SafeNamedCache.put(SafeNamedCache.CDB:1)
at com.tangosol.net.cache.CachingMap.put(CachingMap.java:928)
at com.tangosol.net.cache.CachingMap.put(CachingMap.java:887)
at com.tangosol.net.cache.NearCache.put(NearCache.java:286)
at com.conduit.server.properties.CLDistributedPropertiesManager$UpdatePropertiesProcessor.process(CLDistributedPropertiesManager.java:249)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$Storage.invoke(DistributedCache.CDB:20)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache.onInvokeRequest(DistributedCache.CDB:50)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$InvokeRequest.run(DistributedCache.CDB:1)
at com.tangosol.coherence.component.net.message.requestMessage.DistributedCacheKeyRequest.onReceived(DistributedCacheKeyRequest.CDB:12)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onMessage(Grid.CDB:9)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onNotify(Grid.CDB:130)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache.onNotify(DistributedCache.CDB:3)
at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:37)
at java.lang.Thread.run(Thread.java:637)Hi,
reentrant calls to the same Coherence service is very much recommended against.
For more about it, please look at the following Wiki page:
http://wiki.tangosol.com/display/COH34UG/Constraints+on+Re-entrant+Calls
Best regards,
Robert -
OC4J: marshalling does not recreate the same data structure onthe client
Hi guys,
I am trying to use OC4J as an EJB container and have come across the following problem, which looks like a bug.
I have a value object method that returns an instance of ArrayList with references to other value objects of the same class. The value objects have references to other value objects. When this structure is marshalled across the network, we expect it to be recreated as is but that does not happen and instead objects get duplicated.
Suppose we have 2 value objects: ValueObject1 and ValueObject2. ValueObject1 references ValueObject2 via its private field and the ValueObject2 references ValueObject1. Both value objects are returned by our method in an ArrayList structure. Here is how it will look like (number after @ represents an address in memory):
Object[0] = com.cramer.test.SomeVO@1
Object[0].getValueObject[0] = com.cramer.test.SomeVO@2
Object[1] = com.cramer.test.SomeVO@2
Object[1].getValueObject[0] = com.cramer.test.SomeVO@1
We would expect to see the same (except exact addresses) after marshalling. Here is what we get instead:
Object[0] = com.cramer.test.SomeVO@1
Object[0].getValueObject[0] = com.cramer.test.SomeVO@2
Object[1] = com.cramer.test.SomeVO@3
Object[1].getValueObject[0] = com.cramer.test.SomeVO@4
It can be seen that objects get unnecessarily duplicated â“ the instance of the ValueObject1 referenced by the ValueObject2 is not the same now as the instance that is referenced by the ArrayList instance.
This does not only break referential integrity, structure and consistency of the data but dramatically increases the amount of information sent across the network. The problem was discovered when we found that a relatively small but complicated structure that gets serialized into a 142kb file requires about 20Mb of network communication. All this extra info is duplicated object instances.
I have created a small test case to demonstrate the problem and let you reproduce it.
Here is RMITestBean.java:
package com.cramer.test;
import javax.ejb.EJBObject;
import java.util.*;
public interface RMITestBean extends EJBObject
public ArrayList getSomeData(int testSize) throws java.rmi.RemoteException;
public byte[] getSomeDataInBytes(int testSize) throws java.rmi.RemoteException;
Here is RMITestBeanBean.java:
package com.cramer.test;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import java.util.*;
public class RMITestBeanBean implements SessionBean
private SessionContext context;
SomeVO someVO;
public void ejbCreate()
someVO = new SomeVO(0);
public void ejbActivate()
public void ejbPassivate()
public void ejbRemove()
public void setSessionContext(SessionContext ctx)
this.context = ctx;
public byte[] getSomeDataInBytes(int testSize)
ArrayList someData = getSomeData(testSize);
try {
java.io.ByteArrayOutputStream byteOutputStream = new java.io.ByteArrayOutputStream();
java.io.ObjectOutputStream objectOutputStream = new java.io.ObjectOutputStream(byteOutputStream);
objectOutputStream.writeObject(someData);
objectOutputStream.flush();
System.out.println(" serialised output size: "+byteOutputStream.size());
byte[] bytes = byteOutputStream.toByteArray();
objectOutputStream.close();
byteOutputStream.close();
return bytes;
} catch (Exception e) {
System.out.println("Serialisation failed: "+e.getMessage());
return null;
public ArrayList getSomeData(int testSize)
// Create array of objects
ArrayList someData = new ArrayList();
for (int i=0; i<testSize; i++)
someData.add(new SomeVO(i));
// Interlink all the objects
for (int i=0; i<someData.size()-1; i++)
for (int j=i+1; j<someData.size(); j++)
((SomeVO)someData.get(i)).addValueObject((SomeVO)someData.get(j));
((SomeVO)someData.get(j)).addValueObject((SomeVO)someData.get(i));
// print out the data structure
System.out.println("Data:");
for (int i = 0; i<someData.size(); i++)
SomeVO tmp = (SomeVO)someData.get(i);
System.out.println("Object["+Integer.toString(i)+"] = "+tmp);
System.out.println("Object["+Integer.toString(i)+"]'s some number = "+tmp.getSomeNumber());
for (int j = 0; j<tmp.getValueObjectCount(); j++)
SomeVO tmp2 = tmp.getValueObject(j);
System.out.println(" getValueObject["+Integer.toString(j)+"] = "+tmp2);
System.out.println(" getValueObject["+Integer.toString(j)+"]'s some number = "+tmp2.getSomeNumber());
// Check the serialised size of the structure
try {
java.io.ByteArrayOutputStream byteOutputStream = new java.io.ByteArrayOutputStream();
java.io.ObjectOutputStream objectOutputStream = new java.io.ObjectOutputStream(byteOutputStream);
objectOutputStream.writeObject(someData);
objectOutputStream.flush();
System.out.println("Serialised output size: "+byteOutputStream.size());
objectOutputStream.close();
byteOutputStream.close();
} catch (Exception e) {
System.out.println("Serialisation failed: "+e.getMessage());
return someData;
Here is RMITestBeanHome:
package com.cramer.test;
import javax.ejb.EJBHome;
import java.rmi.RemoteException;
import javax.ejb.CreateException;
public interface RMITestBeanHome extends EJBHome
RMITestBean create() throws RemoteException, CreateException;
Here is ejb-jar.xml:
<?xml version = '1.0' encoding = 'windows-1252'?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd">
<ejb-jar>
<enterprise-beans>
<session>
<description>Session Bean ( Stateful )</description>
<display-name>RMITestBean</display-name>
<ejb-name>RMITestBean</ejb-name>
<home>com.cramer.test.RMITestBeanHome</home>
<remote>com.cramer.test.RMITestBean</remote>
<ejb-class>com.cramer.test.RMITestBeanBean</ejb-class>
<session-type>Stateful</session-type>
<transaction-type>Container</transaction-type>
</session>
</enterprise-beans>
</ejb-jar>
And finally the application that tests the bean:
package com.cramer.test;
import java.util.*;
import javax.rmi.*;
import javax.naming.*;
public class RMITestApplication
final static boolean HARDCODE_SERIALISATION = false;
final static int TEST_SIZE = 2;
public static void main(String[] args)
Hashtable props = new Hashtable();
props.put(Context.INITIAL_CONTEXT_FACTORY, "com.evermind.server.rmi.RMIInitialContextFactory");
props.put(Context.PROVIDER_URL, "ormi://lil8m:23792/alexei");
props.put(Context.SECURITY_PRINCIPAL, "admin");
props.put(Context.SECURITY_CREDENTIALS, "admin");
try {
// Get the JNDI initial context
InitialContext ctx = new InitialContext(props);
NamingEnumeration list = ctx.list("comp/env/ejb");
// Get a reference to the Home Object which we use to create the EJB Object
Object objJNDI = ctx.lookup("comp/env/ejb/RMITestBean");
// Now cast it to an InventoryHome object
RMITestBeanHome testBeanHome = (RMITestBeanHome)PortableRemoteObject.narrow(objJNDI,RMITestBeanHome.class);
// Create the Inventory remote interface
RMITestBean testBean = testBeanHome.create();
ArrayList someData = null;
if (!HARDCODE_SERIALISATION)
// ############################### Alternative 1 ##############################
// ## This relies on marshalling serialisation ##
someData = testBean.getSomeData(TEST_SIZE);
// ############################ End of Alternative 1 ##########################
} else
// ############################### Alternative 2 ##############################
// ## This gets a serialised byte stream and de-serialises it ##
byte[] bytes = testBean.getSomeDataInBytes(TEST_SIZE);
try {
java.io.ByteArrayInputStream byteInputStream = new java.io.ByteArrayInputStream(bytes);
java.io.ObjectInputStream objectInputStream = new java.io.ObjectInputStream(byteInputStream);
someData = (ArrayList)objectInputStream.readObject();
objectInputStream.close();
byteInputStream.close();
} catch (Exception e) {
System.out.println("Serialisation failed: "+e.getMessage());
// ############################ End of Alternative 2 ##########################
// Print out the data structure
System.out.println("Data:");
for (int i = 0; i<someData.size(); i++)
SomeVO tmp = (SomeVO)someData.get(i);
System.out.println("Object["+Integer.toString(i)+"] = "+tmp);
System.out.println("Object["+Integer.toString(i)+"]'s some number = "+tmp.getSomeNumber());
for (int j = 0; j<tmp.getValueObjectCount(); j++)
SomeVO tmp2 = tmp.getValueObject(j);
System.out.println(" getValueObject["+Integer.toString(j)+"] = "+tmp2);
System.out.println(" getValueObject["+Integer.toString(j)+"]'s some number = "+tmp2.getSomeNumber());
// Print out the size of the serialised structure
try {
java.io.ByteArrayOutputStream byteOutputStream = new java.io.ByteArrayOutputStream();
java.io.ObjectOutputStream objectOutputStream = new java.io.ObjectOutputStream(byteOutputStream);
objectOutputStream.writeObject(someData);
objectOutputStream.flush();
System.out.println("Serialised output size: "+byteOutputStream.size());
objectOutputStream.close();
byteOutputStream.close();
} catch (Exception e) {
System.out.println("Serialisation failed: "+e.getMessage());
catch(Exception ex){
ex.printStackTrace(System.out);
The parameters you might be interested in playing with are HARDCODE_SERIALISATION and TEST_SIZE defined at the beginning of RMITestApplication.java. The HARDCODE_SERIALISATION is a flag that specifies whether Java serialisation should be used to pass the data across or we should rely on OC4J marshalling. TEST_SIZE defines the size of the object graph and the ArrayList structure. The bigger this size is the more dramatic effect you get from data duplication.
The test case outputs the structure both on the server and on the client and prints out the size of the serialised structure. That gives us sufficient comparison, as both structure and its size should be the same on the client and on the server.
The test case also demonstrates that the problem is specific to OC4J. The standard Java serialisation does not suffer the same flaw. However using the standard serialisation the way I did in the test case code is generally unacceptable as it breaks the transparency benefit and complicates interfaces.
To run the test case:
1) Modify provider URL parameter value on line 15 of the RMITestApplication.java for your environment.
2) Deploy the bean to the server.
4) Run RMITestApplication on a client PC.
5) Compare the outputs on the server and on the client.
I hope someone can reproduce the problem and give their opinion, and possibly point to the solution if there is one at the moment.
Cheers,
AlexeiHi,
Eugene, wrong end user recovery. Alexey is referring to client desktop end user recovery which is entirely different.
Alexy - As noted in the previous post:
http://social.technet.microsoft.com/Forums/en-US/bc67c597-4379-4a8d-a5e0-cd4b26c85d91/dpm-2012-still-requires-put-end-users-into-local-admin-groups-for-the-purpose-of-end-user-data?forum=dataprotectionmanager
Each recovery point has users permisions tied to it, so it's not possible to retroacively give the users permissions. Implement the below and going forward all users can restore their own files.
This is a hands off solution to allow all users that use a machine to be able to restore their own files.
1) Make these two cmd files and save them in c:\temp
2) Using windows scheduler – schedule addperms.cmd to run daily – any new users that log onto the machine will automatically be able to restore their own files.
<addperms.cmd>
Cmd.exe /v /c c:\temp\addreg.cmd
<addreg.cmd>
set users=
echo Windows Registry Editor Version 5.00>c:\temp\perms.reg
echo [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Data Protection Manager\Agent\ClientProtection]>>c:\temp\perms.reg
FOR /F "Tokens=*" %%n IN ('dir c:\users\*. /b') do set users=!users!%Userdomain%\\%%n,
echo "ClientOwners"=^"%users%%Userdomain%\\bogususer^">>c:\temp\perms.reg
REG IMPORT c:\temp\perms.reg
Del c:\temp\perms.reg
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Regards, Mike J. [MSFT]
This posting is provided "AS IS" with no warranties, and confers no rights. -
What kind of data structure should I use?
I have a user input dialog basically like following which need user input the sample number to specifiy each file belongs to which sample:
user input the sample number in the following dialog:
file name sample
test 1 1
test2 2
test3 1
test4 2In another words, each sample could include multiple files, each file has a column of data. I tried to get
a data structure which specifies the sample and file relationship, to get an idea of what kind of files are in
one sample. I tried to use hashmap or hashtable, but they ask the key must be unique. What I need is to get the sample data structure for the later data processing.
thanks in advance!You could make a Sample object, which creates a List of file names. Then put SampleNumber and SampleObject into a Map...
class Sample {
java.util.List fileNames;
Sample()
{ fileNames = java.util.ArrayList(5); }
addFile(String fName)
{ fileNames.add(fName); }
String[] getFileNames()
String[] names = new String[fileNames.size()];
for (int a = 0; a < names.length; a++)
{ names[a] = fileNames.get(a).toString(); }
return names;
Map samples = new HashMap();
Sample samp1 = new Sample();
samp1.addFile("Test1"); samp1.addFile("Test3");
Sample samp2 = new Sample();
samp2.addFile("Test2"); samp2.addFile("Test4");
samples.add("1", samp1);
samples.add("2", samp2);
String selected = //String user selects...
Sample sampNeeded = (Sample)samples.get(selected);
String[] files = sampNeeded.getFileNames(); -
*** PLEASE DO NOT REPLY TO THIS POSTING UNLESS
*** YOU KNOW EXACTLY WHAT I AM TALKING ABOUT
*** AND HAVE SOLUTION AT THE READY.
*** NO SWING TREE FYIs PLEASE...doesn't apply.
*** NO UI JAVASCRIPTS .. I HAVE THOSE.
I need a properly constructed multiway
(m-way, general, n-ary, etc.) data structure
implementation that uses non-ui
dependent/associated classes. This is know as the
first child/next sibling data structure used in
Filesystems (similiar to a BTree).
I am using many delimited strings, similiar to a
directory/file structure path but the string is a
software project hierarchy.
[a string is structured like this]
root|branch|...|branch|leaf
[Process]
1) the strings are fetched from DB by servlet.
2) servlet feeds strings into data structure
to eliminate duplicates and place in proper location.
3) servlet uses contents of data structure to
construct links that are coupled with the infamous
ui-tree script.
If you know your data structures and have an implementation
that won't take me 6 days to modify for it to work I would
appreciate your assistance. I am creating on my own as we
speak but one from a more experienced java programmer would
be better.
Thank You,
KevinSounds like one hell of a frustrated programmer over there - all those capitals an'all..
If I understand you correctly, I don't think you'd take six days to implement this; just split your string by the separator;
String[] split(String path, char sep, char esc) {
String[] result = new String[0];
int o = 0;
int i; for (i=0; i<path.length(); ++i) {
char c = path.charAt(i);
if (c == esc) {
++i;
continue;
if (c == sep) {
String substring = path.substring(o, i);
String[] newresult = new String[result.length+1];
System.arraycopy(result, 0, newresult, 0, result.length);
newresult[result.length] = substring;
result = newresult;
o = i+1;
}Then have a java.util.Hashtable as root, with all names in it pointers to either more Hashtables (nodes), or Strings (leaves). If it really does not get anymore complex than that (data associated with leaves, for example), you don't really have to use anything more complex than 'instanceof' here.
Then start looping over all your String[] split paths, retrieve all nodes, if it's a String and you have a child for it, then convert it to a Hashtable, it it's a Hashtable trod along, if it isn't there create a String (unless you know you have an extra child, in which case you create a Hashtable).
When you're ready to retrieve, just enumerate your root Hashtable, casting to String all the keys, examining all the values; if they are Hashtable, then recurse. If they're Strings, do your Thing (TM). -
Simple Transformation to deserialize an XML file into ABAP data structures?
I'm attempting to write my first simple transformation to deserialize
an XML file into ABAP data structures and I have a few questions.
My simple transformation contains code like the following
<tt:transform xmlns:tt="http://www.sap.com/transformation-templates"
xmlns:pp="http://www.sap.com/abapxml/types/defined" >
<tt:type name="REPORT" line-type="?">
<tt:node name="COMPANY_ID" type="C" length="10" />
<tt:node name="JOB_ID" type="C" length="20" />
<tt:node name="TYPE_CSV" type="C" length="1" />
<tt:node name="TYPE_XLS" type="C" length="1" />
<tt:node name="TYPE_PDF" type="C" length="1" />
<tt:node name="IS_NEW" type="C" length="1" />
</tt:type>
<tt:root name="ROOT2" type="pp:REPORT" />
<QueryResponse>
<tt:loop ref="ROOT2" name="line">
<QueryResponseRow>
<CompanyID>
<tt:value ref="$line.COMPANY_ID" />
</CompanyID>
<JobID>
<tt:value ref="$line.JOB_ID" />
</JobID>
<ExportTypes>
<tt:loop>
<ExportType>
I don't know what to do here (see item 3, below)
</ExportType>
</tt:loop>
</ExportTypes>
<IsNew>
<tt:value ref="$line.IS_NEW"
map="val(' ') = xml('false'), val('X') = xml('true')" />
</IsNew>
</QueryResponseRow>
</tt:loop>
</QueryResponse>
</tt:loop>
1. In a DTD, an element can be designated as occurring zero or one
time, zero or more times, or one or more times. How do I write the
simple transformation to accommodate these possibilities?
2. In trying to accommodate the "zero or more times" case, I am trying
to use the <tt:loop> instruction. It occurs several layers deep in the
XML hierarchy, but at the top level of the ABAP table. The internal
table has a structure defined in the ABAP program, not in the data
dictionary. In the simple transformation, I used <tt:type> and
<tt:node> to define the structure of the internal table and then
tried to use <tt:loop ref="ROOT2" name="line"> around the subtree that
can occur zero or more times. But every variation I try seems to get
different errors. Can anyone supply a working example of this?
3. Among the fields in the internal table, I've defined three
one-character fields named TYPE_CSV, TYPE_XLS, and TYPE_PDF. In the
XML file, I expect zero to three elements of the form
<ExportType exporttype='csv' />
<ExportType exporttype='xls' />
<ExportType exporttype='pdf' />
I want to set field TYPE_CSV = 'X' if I find an ExportType element
with its exporttype attribute set to 'csv'. I want to set field
TYPE_XLS = 'X' if I find an ExportType element with its exporttype
attribute set to 'xls'. I want to set field TYPE_PDF = 'X' if I find
an ExportType element with its exporttype attribute set to 'pdf'. How
can I do that?
4. For an element that has a value like
<ErrorCode>123</ErrorCode>
in the simple transformation, the sequence
<ErrorCode> <tt:value ref="ROOT1.CODE" /> </ErrorCode>
seems to work just fine.
I have other situations where the XML reads
<IsNew value='true' />
I wanted to write
<IsNew>
<tt:value ref="$line.IS_NEW"
map="val(' ') = xml('false'), val('X') = xml('true')" />
</IsNew>
but I'm afraid that the <tt:value> fails to deal with the fact that in
the XML file the value is being passed as the value of an attribute
(named "value"), rather than the value of the element itself. How do
you handle this?Try this code below:
data l_xml_table2 type table of xml_line with header line.
W_filename - This is a Path.
if w_filename(02) = '
open dataset w_filename for output in binary mode.
if sy-subrc = 0.
l_xml_table2[] = l_xml_table[].
loop at l_xml_table2.
transfer l_xml_table2 to w_filename.
endloop.
endif.
close dataset w_filename.
else.
call method cl_gui_frontend_services=>gui_download
exporting
bin_filesize = l_xml_size
filename = w_filename
filetype = 'BIN'
changing
data_tab = l_xml_table
exceptions
others = 24.
if sy-subrc <> 0.
message id sy-msgid type sy-msgty number sy-msgno
with sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
endif. -
Can I automate the creation of a cluster in LabView using the data structure created in an auto generated .CSV, C header, or XML file? I'm trying to take the data structure defined in one or more of those files listed and have LabView automatically create a cluster with identical structure and data types. (Ideally, I would like to do this with a C header file only.) Basically, I'm trying to avoid having to create the cluster by hand, as the number of cluster elements could be very large. I've looked into EasyXML and contacted the rep for the add-on. Unfortunately, this capability has not been created yet. Has anyone done something like this before? Thanks in advance for the help.
Message Edited by PhilipJoeP on 04-29-2009 04:54 PM
Solved!
Go to Solution.smercurio_fc wrote:
Is this something you're trying to do at runtime? Clusters are fixed data structures so you can't change them programmatically. Or, are you just trying to create some typedef cluster controls so that you can use them for coding? What would your clusters basically look like? Perhaps another way of holding the information like an array of variants?
You can try LabVIEW scripting, though be aware that this is not supported by NI.
Wow! Thanks for the quick response! We would use this cluster as a fixed data structure. No need to change the structure during runtime. The cluster would be a cluster of clusters with multiple levels. There would be not pattern as to how deep these levels would go, or how many elements would be in each. Here is the application. I would like to be able to autocode a Simulink model file into a DLL. The model DLL would accept a Simulink bus object of a certain data structure (bus of buses), pick out which elements of the bus is needed for the model calculation, and then pass the bus object. I then will take the DLL file and use the DLL VI block to pass a cluster into the DLL block (with identical structure as the bus in Simulink). To save time, I would like to auto generate the C header file using Simulink to define the bus structure and then have LabView read that header file and create the cluster automatically. Right now I can do everything but the auto creation of the cluster. I can manually build the cluster to match the Simulink model bus structure and it runs fine. But this is only for an example model with a small structure. Need to make the cluster creation automated so it can handle large structures with minimal brute force. Thanks! -
What is the best data structure for loading an enterprise Power BI site?
Hi folks, I'd sure appreciate some help here!
I'm a kinda old-fashioned gal and a bit of a traditionalist, building enterprise data warehouses out of Analysis Service hypercubes with a whole raft of MDX for analytics. Those puppies would sit up and beg when you asked them to deliver up goodies
to SSRS or PowerView.
But Power BI is a whole new game for me.
Should I be exposing each dimension and fact table in the relational data warehouse as a single Odata feed?
Should I be running Data Management Gateway and exposing each table in my RDW individually?
Should I be flattening my stars and snowflakes and creating a very wide First Normal Form dataset with everything relating to each fact?
I guess my real question, folks, is what's the optimum way of exposing data to the Power BI cloud?
And my subsidiary question is this: am I right in saying that all the data management, validation, cleansing, and regular ETTL processes are still required
before the data is suitable to expose to Power BI?
Or, to put it another way, is it not the case that you need to have a clean and properly structured data warehouse
before the data is ready to be massaged and presented by Power BI?
I'd sure value your thoughts and opinions,
Cheers, Donna
Donna KellyDear All,
My original question was:
what's the optimum way of exposing data to the Power BI cloud?
Having spent the last month faffing about with Power BI – and reading about many people’s experiences using it – I think I can offer a few preliminary conclusions.
Before I do that, though, let me summarise a few points:
Melissa said “My initial thoughts: I would expose each dim & fact as a separate OData feed” and went on to say “one of the hardest things . . . is
the data modeling piece . . . I think we should try to expose the data in a way that'll help usability . . . which wouldn't be a wide, flat table ”.
Greg said “data modeling is not a good thing to expose end users to . . . we've had better luck with is building out the data model, and teaching the users
how to combine pre-built elements”
I had commented “. . . end users and data modelling don't mix . . . self-service so
far has been mostly a bust”.
Here at Redwing, we give out a short White Paper on Business Intelligence Reporting. It goes to clients and anyone else who wants one. The heart
of the Paper is the Reporting Pyramid, which states: Business intelligence is all about the creation and delivery of actionable intelligence to the right audience at the right time
For most of the audience, that means Corporate BI: pre-built reports delivered on a schedule.
For most of the remaining audience, that means parameterised, drillable, and sliceable reporting available via the web, running the gamut from the dashboard to the details, available on
demand.
For the relatively few business analysts, that means the ability for business users to create their own semi-customised visual reports when required, to serve
their audiences.
For the very few high-power users, that means the ability to interrogate the data warehouse directly, extract the required data, and construct data mining models, spreadsheets and other
intricate analyses as needed.
On the subject of self-service, the Redwing view says: Although many vendors want tot sell self-service reporting tools to the enterprise, the facts of the matter are these:
v
80%+ of all enterprise reporting requirement is satisfied by corporate BI . . . if it’s done right.
v Very few staff members have the time, skills, or inclination to learn and employ self-service business intelligence in the course of their activities.
I cannot just expose raw data and tell everyone to get on with it. That way lies madness!
I think that clean and well-structured data is a prerequisite for delivering business intelligence.
Assuming that data is properly integrated, historically accurate and non-volatile as well, then I've just described
a data warehouse, which is the physical expression of the dimensional model.
Therefore, exposing the presentation layer of the data warehouse is – in my opinion – the appropriate interface for self-service business intelligence.
Of course, we can choose to expose perspectives as well, which is functionally identical to building and exposing subject data marts.
That way, all calculations, KPIs, definitions, and even field names, and all consistent because they all come from the single source of the truth, and not from spreadmart hell.
So my conclusion is that exposing the presentation layer of the properly modelled data warehouse is – in general - the way to expose data for self-service.
That’s fine for the general case, but what about Power BI? Well, it’s important to distinguish between new capabilities in Excel, and the ones in Office 365.
I think that to all intents and purposes, we’re talking about exposing data through the Data Management Gateway and reading it via Power Query.
The question boils down to what data structures should go down that pipe.
According to
Create a Data Source and Enable OData Feed in Power BI Admin Center, the possibilities are tables and views. I guess I could have repeating data in there, so it could be a flattened structure of the kind Melissa doesn’t like (and neither do I).
I could expose all the dims and all the facts . . . but that would mean essentially re-building the DW in the PowerPivot DM, and that would be just plain stoopid. I mean, not a toy system, but a real one with scores of facts and maybe hundreds of dimensions?
Fact is, I cannot for the life of me see what advantages DMG/PQ
has over just telling corporate users to go directly to the Cube Perspective they want, that has already all the right calcs, KPIs, security, analytics, field names . . . and most importantly, is already modelled correctly!
If I’m a real Power User, then I can use PQ on my desktop to pull mashup data from the world, along with all my on-prem data through my exposed Cube presentation layer, and PowerPivot the
heck out of that to produce all the reporting I’d ever want. It'd be a zillion times faster reading the data directly from the Cube instead of via the DMG, as well (I think Power BI performance sucks, actually).
Of course, your enterprise might not
have a DW, just a heterogeneous mass of dirty unstructured data. If that’s the case,
choosing Power BI data structures is the least of your problems! :-)
Cheers, Donna
Donna Kelly -
Urgent! Need help in deciding data structure to use
Hi all,
I need to implement a restaurant system by which a customer can make a reservation.
I was wondering whether vector would be able to be store such an object, The thing is I don't want a complex data structure. just sumthin simple cos i hardly have anytime left to my submission. sighz...
The thing is I need to able to search based on 2 properties of an object. Eg. I need to search for a reservation based on the customer name and the date he reserved a table.
But I am totally clueless how to search thru a vector based on 2 properties of the object... Would really appreciate some help. Like an example how to so so based on my program. Feelin so lost...This is all I have so far:
class AddReservation
static BufferedReader stdin = new BufferedReader (new InputStreamReader(System.in));
//Main Method
public static void main (String[]args)throws IOException
String custName, comments;
int covers, date, startTime, endTime;
int count = 0;
//User can only add one reservation at a time
do
//Create a new reservation
Reservation oneReservation=new Reservation();
System.out.println("Please enter customer's name:");
System.out.flush();
custName = stdin.readLine();
oneReservation.setcustName(custName);
System.out.println("Please enter number of covers:");
System.out.flush();
covers = Integer.parseInt(stdin.readLine());
oneReservation.setCovers(covers);
System.out.println("Please enter date:");
System.out.flush();
date = Integer.parseInt(stdin.readLine());
oneReservation.setDate(date);
System.out.println("Please enter start time:");
System.out.flush();
startTime = Integer.parseInt(stdin.readLine());
oneReservation.setstartTime(startTime);
System.out.println("Please enter end time:");
System.out.flush();
endTime = Integer.parseInt(stdin.readLine());
oneReservation.setendTime(endTime);
System.out.println("Please enter comments, if any:");
System.out.flush();
comments = stdin.readLine();
oneReservation.setComments(comments);
count++;
while (count<1);
class Reservation
private Reservation oneReservation;
private String custName, comments;
private int covers, startTime, endTime, date;
//Default constructor
public Reservation()
public Reservation(String custName, int covers, int date, int startTime, int endTime, String comments)
this.custName=custName;
this.covers=covers;
this.date=date;
this.startTime=startTime;
this.endTime=endTime;
this.comments=comments;
//Setter methods
public void setcustName(String custName)
this.custName=custName;
public void setCovers(int covers)
this.covers=covers;;
public void setDate(int date)
this.date=date;
public void setstartTime(int startTime)
this.startTime=startTime;
public void setendTime(int endTime)
this.endTime=endTime;
public void setComments(String comments)
this.comments=comments;
//Getter methods
public String getcustName()
return custName;
public int getCovers()
return covers;
public int getDate()
return date;
public int getstartTime()
return startTime;
public int getendTime()
return endTime;
public String getComments()
return comments;
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
class searchBooking
static BufferedReader stdin = new BufferedReader (new InputStreamReader(System.in));
public static void main (String[]args)throws IOException
int choice, date, startTime;
String custName;
//Search Menu
System.out.println("Search By: ");
System.out.println("1. Date");
System.out.println("2. Name of Customer");
System.out.println("3. Date & Name of Customer");
System.out.println("4. Date & Start time of reservation");
System.out.println("5. Date, Name of customer & Start time of reservation");
System.out.println("Please make a selection: ");
//User keys in choice
System.out.flush();
choice = Integer.parseInt(stdin.readLine());
if (choice==1)
System.out.println("Please key in Date (DDMMYY):");
System.out.flush();
date = Integer.parseInt(stdin.readLine());
else if (choice==2)
System.out.println("Please key in Name of Customer:");
System.out.flush();
custName = stdin.readLine();
else if (choice==3)
System.out.println("Please key in Date (DDMMYY):");
System.out.flush();
date = Integer.parseInt(stdin.readLine());
System.out.println("Please key in Name of Customer:");
System.out.flush();
custName = stdin.readLine();
else if (choice==4)
System.out.println("Please key in Date (DDMMYY):");
System.out.flush();
date = Integer.parseInt(stdin.readLine());
System.out.println("Please key in Start time:");
System.out.flush();
startTime = Integer.parseInt(stdin.readLine());
else if (choice==5)
System.out.println("Please key in Date (DDMMYY):");
System.out.flush();
date = Integer.parseInt(stdin.readLine());
System.out.println("Please key in Name of Customer:");
System.out.flush();
custName = stdin.readLine();
System.out.println("Please key in Start time:");
System.out.flush();
startTime = Integer.parseInt(stdin.readLine());
}Please stop calling your questions urgent. Everybody's question is urgent to them. Nobody's are urgent to the people who are going to answer them. Calling your questions urgent suggests that you think they are more important than others' (They're not.) and will only serve to irritate those who would help you. It won't get your questions answered any sooner.
-
What's the easiest way to move app data and data structures to a server?
Hi guys,
I've been developing my app locally with Apex 4.2 and Oracle 11g XE on Windows 7. It's getting close to the time to move the app to an Oracle Apex server. I imagine Export/Import is the way to move the app. But what about the app tables and data (those tables/data like "customer" and "account" created specifically for the app)? I've been using a data modeling tool, so I can run a DDL script to create the data structures on the server. What is the easiest way to move the app data to the server? Is there a way to move both structures and data in one process?
Thanks,
KimThere's probably another way to get here, but, in SQL Developer, on the tree navigation, expand the objects down to your table, right click, then click EXPORT.. there you will see all the options. This is a tedious process and it sucks IMO, but yeah, it works. It sucks mostly because 1) it's one table at a time, 2) if your data model is robust and has constraints, and sequences and triggers, then you'll have to disable them all for the insert, and hope that you can re-enable constraints, etc without a glitch (good luck, unless you have only a handful of tables)
I prefer using the oracle command line EXP to export an entire schema, then on the target server I use IMP to import the schema. That way, it's near exact. This makes life messy if you develop more than one application in a single schema, and I've felt that pain -- however -- it's a whole lot easier to drop tables and other objects than it is to create them! (thus, even if the process of EXP/IMP moved more than you wanted to "move".. just blow away what you don't want on the target after the fact..)
You could use oracle's datapump method too.
Alternatively, what can be done, IF you have access to both servers from your SQL developer instance (or if you can tnsping them both already from the command line, you can use SQL*PLUS), is run a script that will identify your apex apps' objects (usually by prefix to object names, like EBA_PROJ_%, etc) and do all the manual work for you. I've created a script that does exactly this so that I can move data from dev to prod servers over a dblink. It's tricky because of the order that must be executed to disable constraints and then re-enable them, and of course, trickier if you don't consistently prefix ALL of your "application objects"... (tables, views, triggers, sequences, functions, procs, indexes, etc) -
A robust data structure for a histogram of events over time.
Hi all,
I've been thinking for days, I am still lost on how to solve the following:
Let's say that we have a list of events that occur over a certain time interval. Each event has a start timestamp and a finish timestamp. The events occur in no particular order and expand over various length of periods.
With respect to the histogram, we mark the time period of an event occuring with a frequency of one. When events overlap over a time period, we mark that time period with a frequency of number of overlapping events.
Given this raw data, we want to examine the data's frequency under various granularity such as second, minutes, hours, days, weeks, month and years for 60sec, 60min, 24 hrs, 7 days, 4 wks ranges respectively.
So, what is a good intermediate (general) data structure that can store all the various events such that they can be easily transformed to a specific granularity. My goal here is to read the event list once, and histogram of events data with respect to various timeframe can be calculated.
Does a timeline like data strucuture that stores aggregated frequencies solve my problem? With a fine granuarlity say seconds and a long time range, the data structure will bound to overflow.
Any help is greatly appreciated!
BrianYou data structure would be in terms of Classes. You need a class Anevent{
String eventName;
Date startTime;
Date endTime;
In your main program have a Vector object which can store unllimited objects and which would not overflow. Store your event objects as they happen in this Vector. After your time interval of events is completed and you have the final Vector, you can pass the vector object to various methods in your main program to be simple or pass it to specailized graph drawing classes you would have to write to draw various Histograms. -
Looking for suitable and robust data structure?
I have an application where i have to give user an option to correlate the
response returned by a method call with other methods arguments.
I have provided a jtree struture where user can see methods and their
responses and can correlate them by selecting appropriate arguments
where these values could be used.
I used a data structure to store such relations like
A hashmap where every key is a unique number representing method number
and value ia a matrix.
In each matrix, the first element of every row would be the Response object and
all remaining elments in the row would be Argument objects. :)
Now maybe someone would ask, for every method there is always only one return type
then why such a matrix with Reponse object as first element of each row.
The reason is that i gave user an option to not only relate response as a whole Object to
different arguments of different methods but user can select a field of this response object if this
is a complex type or user can select any element if the response is a Collection object to relate
with arguments.
I am not sure whether this structure is more appropriate or i can use more robust
and memory efficient structure.
Please give me your useful suggestions.J2EER wrote:
I have an application where i have to give user an option to correlate the
response returned by a method call with other methods arguments.I really don't understand you.
I have provided a jtree struture where user can see methods and their
responses and can correlate them by selecting appropriate arguments
where these values could be used.Huh?
I used a data structure to store such relations likeErr, what happened to the rest of your sentence? Or is the next part the rest of it?
A hashmap where every key is a unique number representing method number
and value ia a matrix.Where does this matrix come from? In my book, a matrix is a 2 dimensional structure. What do you mean by it?
In each matrix, the first element of every row would be the Response object and
all remaining elments in the row would be Argument objects. :)
Now maybe someone would ask, for every method there is always only one return type
then why such a matrix with Reponse object as first element of each row.You're still talking about methods? If so, don't all methods have just one return type?
The reason is that i gave user an option to not only relate response as a whole Object to
different arguments of different methods but user can select a field of this response object if this
is a complex type or user can select any element if the response is a Collection object to relate
with arguments.
I am not sure whether this structure is more appropriate or i can use more robust
and memory efficient structure.
Please give me your useful suggestions.Perhaps you could give a more detailed explanation and more importantly, provide some examples of what you mean. -
Hello! This is my first time in this discussion group. The question posed is the subject line itself:
What is the smallest data structure record in a .TXT file record to be recognized as an Apple Address Book "Data Card"?
I'm lazy! As a math instructor with 40+ students per class per semester (pCpS), I would rather not have to create 40 data cards pCpS by hand, only to expunge that info at semester's end. My college's IS department can easily supply me with First name, Last name, and eMail address info, along with a myriad of other fields. I can manipulate those data on my end to create the necessary .TXT file, but I don't know the essential structure of that file.
Can you help me?
Thank you in advance.
BillHello Bill, & welcome aboard!
No idea what pCpS is, sorry.
To import a text file into Address Book, it needs to be a comma delimited .csv file, like...
Customer Name,Company,Address1,Address2,City,State,Zip
Customer 1,Company 1,2233 W Seventh Street,Unit 543,Seattle,WA,99099
Customer 2,Company 2,1 Park Avenue,,New York,NY,10001
Customer 3,Company 3,65 Loma Linda Parkway,,San Jose,CA,94321
Customer 4,Company 4,89988 E 23rd Street,B720,Oakland,CA,99899
Customer 5,Company 5,432 1st Avenue,,Seattle,WA,99876
Customer 6,Company 6,76765 NE 92nd Street,,Seattle,WA,98009
Customer 7,Company 7,8976 Poplar Street,,Coupeville,WA,98976
Customer 8,Company 8,7677 4th Ave North,,Seattle,WA ,89876
Customer 9,Company 9,4556 Fauntleroy Avenue,,West Seattle,WA,98987
Customer 10,Company 10,4 Bell Street,,Cincinnati,OH,89987
Customer 11,Company 11,4001 Beacon Ave North,,Seattle,WA,90887
Customer 12,Company 12,63 Dehli Street,,Noida,India,898877-8879
Customer 13,Company 13,63 Dehli Street,,Noida,India,898877-8879
Customer 14,Company 14,63 Dehli Street,,Noida,India,898877-8879
Customer 15,Company 15,4847 Spirit Lake Drive,,Bellevue,WA,98006
Customer 16,Company 16,444 Clark Avenue,,West Seattle,WA,88989
Customer 17,Company 17,6601 E Stallion,,Scottsdale,AZ,85254
Customer 18,Company 18,801 N 34th Street,,Seattle,WA,98103
Customer 19,Company 19,15925 SE 92nd,,Newcastle,WA,99898
Customer 20,Company 20,3335 NW 220th,2nd Floor,Edmonds,WA,99890
Customer 21,Company 21,444 E Greenway,,Scottsdale,AZ,85654
Customer 22,Company 22,4 Railroad Drive,,Moclips,WA,98988
Customer 23,Company 23,89887 E 64th,,Scottsdale,AZ,87877
Customer 24,Company 24,15620 SE 43rd Street,,Bellevue,WA,98006
Customer 25,Company 25,123 Smalltown,,Redmond,WA,98998
Try Address Book Importer...
http://www.sillybit.com/abee/ -
Open ended data structure for retrieving SQL data
I have a flex project that reads data from a database and
sends it to my flex app to display in a chart. I need to do this in
Actionscript since I have to dynamically create different charts
based on the database definitions. Up til now, I have inserted the
data for each series into a separate
ArrayList(java)/ArrayCollection(flex) in this way:
BindingUtils.bindProperty(lineSeries, "dataProvider", series,
"pointList");
lineSeries.xField="point1";
lineSeries.yField="point2";
The series variable is a custom Actionscript/Java object
which contains an ArrayCollection called pointList. And the array
is made up of custom DataObjects with two fields, point1 &
point2.
But in the new paradigm, I'd basically like to create a big
array of arrays similar to a database table and then just point the
xField to one column, and the yField to another column. Anyway, it
seems like the problem is that my point1 and point2 in the current
implementation are variable names, but with this new dynamic
structure, I won't be able to create variables on the fly. So how
do I let flex know to look at column 3, for example for the yField?
The attached code is from the Flex documentation and is an example
of what I'd like to emulate (except I need to do it in
actionscript). I'd like to be able to select "month" or "amount",
etc. But coming from the Java side, there is no way for me to name
the array contained in each column.I guess I wasn't clear enough. I am actually serializing a
java object and mapping it to an actionscript object via blazeDS. I
know about how the objects translate, for example for
ArrayCollections in flex, I use ArrayLists in java. The problem is
that I'm not sure how to get the associative aspects of the arrays
in flex into my java data structures in a way that will translate
to the way flex can define arrays, such as Month:"January".
It seems that in flex, you can create an Array and assign it
an element like {month:"January", amount:"450"} and it will create
an Object with variables for month and amount. But I don't know how
to do this on the fly in Java (or in Actionscript for that matter)
when I have no way of knowing beforehand how many variables my
object will need. Each series will need an x and y, though usually
the x will be dates which are the same for each series. So if I had
10 series sharing an axis, I'd need 11 variables in my object-
date, series1, series 2...series 10.
Maybe you are looking for
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I am in need of the basic Sony PEGNX70-V Download disc for a computer. How do I get one? Thanks
I am in need of ther basic Sony PEGNX70-V software download disc for a computer. How do I get one? Thank You.
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Hi i am designing UI using Java swings. I am populating a table with 3 columns col 1:strings col2:check box col3:radio button. The requirement(1) is whenever user clicks on the string column then only he should be able to check/uncheck the corr radio
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Compatibility Oracle 9i and Solaris 10.5
Hi, I found the following article somewhere that : Oracle 9i can not install on the solaris sparc 10.5 Art: **Certify - Product Version and Other Selections: Oracle Database - Enterprise Edition On Solaris Operating System x86** **General Notes For O
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Hello, anyone can suggest me a way to check table partition filling by use of pre-insert trigger on partitioned table: when inserting row, I check with a sequence if this row is in what partition, and if it reachs partition bound, before inserting ne
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I am having problems with the Mail search engine.
Here is what is happening. When I attempt to search my Mac Mail sent folders using the Mac Mail's search function, the message window simply goes blank after I enter the second letter into the space next to the magnifying glass icon. This only happen