Populating an empty cluster in an object on the fly

Here is what I would like to do. I want to create a generic vi to handle database functions. I want it to be able to work with a variety of databases, different number of fields (columns) and each field can be either a string or a numeric. For example DB1 can contain a table with Name, Address, Phone (all strings). DB2 can contain a table with Name (str), Age (numeric), Country (str). I want to use a generic object to hold one recordset, and build an array of objects to hold all the data.
I created an object with an empty cluster. I can read the database and get all the column names and data types. How can I build the object so that it has the proper element type with its label being the column name. For instance, when I specify DB1, I want my object to be a cluster of 3 string elements, labeled Name, Address, Phone. If I specify DB2, I want my object to be a cluster of Name (a string), Age (a numeric), and Country (a string).
The database can contain any number of fields of either string or numeric types (I will treat dates as strings). So one database might contain 6 fields and another might contain 12 fields. I would like one generic set of vi's to be able to work with any database I choose without having to hard code the object cluster to match the table columns. Is this possible?
Thanx in advance to whoever can help.
- tbob
Inventor of the WORM Global

Tst's solution sounds good, but too complicated. I avoid overly complicated code as much as I can.
I've decided to keep things simple while also allowing for future expansion and changes. Instead of trying to match the actual data type in the database, I'm going to convert all datatypes to strings after reading the database. Then I can use just a 1D array for the column names and a 2D array for data in my object cluster. That way I can adapt to any database, no matter how many columns, and no matter what data types.
Of course I will have to convert numeric strings to numerics for numerical manipulations (the only thing I'm doing is to compare a measurement with upper and lower limits). Then I have to write back new data to the database. I'll have to convert strings back to the original data types. But I can use the information from the DB Tools List Column vi. It lists the name and datatype of each column.
The Variant idea from smercurio was valuable. It made me think that if I have to convert to variant and back, I might as well just use strings since most of the database fields will be strings anyway.
Thanx to all who tried to help.
Message Edited by tbob on 04-08-2010 09:55 AM
- tbob
Inventor of the WORM Global

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struct list* rest;
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Error: 0xC0047022 at Extract Sample Currency Data, SSIS.Pipeline: SSIS Error Code DTS_E_PROCESSINPUTFAILED.
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I actually have a DimCurrency table in my copy of AdventureWorksDW.
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--Here's how I configured for On Error
--Here is DimDate table in Design view
--Here is a sample of the original data contained in DimData
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--Here's my On Error configuraino
--and here is the FactCurrencyRate table
--and here is a sample of the data contained in FactCurrencyRate
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Conditional Split was just dummy task. Ignore it.
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at java.security.AccessController.doPrivileged(Native Method)
at com.sapportals.portal.prt.dispatcher.Dispatcher.service(Dispatcher.java:415)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.inqmy.services.servlets_jsp.server.InvokerServlet.service(InvokerServlet.java:126)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.inqmy.services.servlets_jsp.server.RunServlet.runSerlvet(RunServlet.java:149)
at com.inqmy.services.servlets_jsp.server.ServletsAndJspImpl.startServlet(ServletsAndJspImpl.java:832)
at com.inqmy.services.httpserver.server.RequestAnalizer.checkFilename(RequestAnalizer.java:666)
at com.inqmy.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:313)
at com.inqmy.services.httpserver.server.Response.handle(Response.java:173)
at com.inqmy.services.httpserver.server.HttpServerFrame.request(HttpServerFrame.java:1288)
at com.inqmy.core.service.context.container.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:36)
at com.inqmy.core.cluster.impl5.ParserRunner.run(ParserRunner.java:55)
at com.inqmy.core.thread.impl0.ActionObject.run(ActionObject.java:46)
at java.security.AccessController.doPrivileged(Native Method)
at com.inqmy.core.thread.impl0.SingleThread.run(SingleThread.java:148)

Hi Michael,
here my comments to your questions:
0.:[Michael says:]
"So basically you're saying that under SP10 its not possible to store objects on the PCD ... ?"
I want to clarify this:
It is possible to store objects in the PCD in lower releases than SP10 (e.g. SP2). But due to the fact that PCD API is not public before SP10 you should not develop a SP2 iView that programmatically uses the PCD API and complain afterwards because some "tiny" things of it are not working in SP10. It might be that you have to adjust some parts of this SP2 iView.
The kind of object that can be stored in the PCD depends on the fact if the objects have a corresponding object provider or not. If you want to store iViews, roles or one of the other commonly known portal objects you can do it because corresponding object provider (iViewservice, roleservice, etc.) are always available in a running portal.
If you want to store objects (like your BeanWrapper class) then you should write a corresponding object provider (what I explained in my first reply).
1.:[Michael asked:]
Why does list and listBindings fail ? surely that should just
list the existing bound objects ???
Nothing was bound!
Your code line
applicationContext.rebind("PCD_LOOKUP_KEY", d);
throws a NamingException because no object provider for class of object d was found.
So I gess you did a lookup on applicationContext.lookup( "PCD_LOOKUP_KEY" ) before you did the list/listBindings and because this
context does not exist the corresponding "Name not found" exception was thrown?
A list/listBinding on the applicationContext itself should work even if nothing was bound.
2.:[Michael asked:]
Is there not some kind of default object/object provider pair
that can be used to store base types like Strings/Integers etc ?
No. There are no default object providers for java string/integers. But for this case "persisting a string or integer value at any PCD context" the PCD offers another way to do it: Just create an additional attribute (of type STRING or INT) and persist the corresponding value in this attribute (of type IPcdAttribute - an extension of javax.naming.directory.Attribute )
The code for creating a pcd attribute looks e.g. like this:
IPcdObjectFactory pcdObjFactory = ((IPcdGlService) PortalRuntime
                                               .getRuntimeResources()
                                               .getService(IPcdGlService.KEY))
                                               .getPcdObjectFactory();
IPcdAttribute newPcdAttr = pcdObjFactory.createPcdAttribute(     PcdAttributeValueType.STRING,
                                        "new_attrId" );
newPcdAttr.set(     0,
          "new_AttrValue" );
ModificationItem mods[] = new ModificationItem[1];
mods[0] = new ModificationItem(      DirContext.REPLACE_ATTRIBUTE,
                           (Attribute)newPcdAttr );
pcdCtx.modifyAttributes(     "",
                    mods );
Hope, that helps you!
Regards,
Jens

How to store java objects in the database

Hi,
I am trying to store HttpSession state across Application Servers. Basically I am trying to build a sort of application cluster server on my own. I thought the best way to do this was to periodically store the HttpSession object from an application server in a database.
I created a table in Oracle 8i with a blob column. I use a PreparedStatement.setObject() method to store the HttpSession object in the database. My problem is, I don't know how to get the object back from the database.
Since ResultSet.getBlob returns the Blob locator, I need to read the BinaryInputStream to get all my data back. This tells me that getBlob basically works only for things like files, and cannot be used for Java objects.
Is there any way around this? Your input would be much appreciated.
Regards,
Somaiah.

Thanks for the quick reply vramakanth.
Do I have to use a type map if I do this? Also does such a type map exist for the HttpSession class?
Thanks,
Somaiah.

Requirements to put my own value object into the context

Hello,
are there any requirements to put my own value object into the context?
I got following exception
An error has occurred:
"Failed to process the request."
Please contact your system administrator.
Hide details
Web Dynpro product information:
Product: null, Vendor: SAP AG, Version: null, Build ID: 6.3006.00.0000.20040617153350.0000, Build Date: Mon Aug 16 09:18:37 CEST 2004
Error stacktrace:
java.lang.ClassCastException
     at com.sap.tc.webdynpro.progmodel.context.Paths.getAttributeInfoFor(Paths.java:186)
     at com.sap.tc.webdynpro.clientimpl.html.uielib.standard.uradapter.DropDownByKeyAdapter.setViewAndNodeElement(DropDownByKeyAdapter.java:230)
     at com.sap.tc.webdynpro.clientimpl.html.uielements.adaptmgr.URAdapterManager.getAdapterFor(URAdapterManager.java:230)
     at com.sap.tc.webdynpro.clientimpl.html.uielements.adaptmgr.URAdapterManager.getAdapterFor(URAdapterManager.java:63)
     at com.sap.tc.webdynpro.clientimpl.html.uielib.standard.uradapter.TableAdapter$ContentCell.getContent(TableAdapter.java:1295)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.SapTableCellRenderer.render(SapTableCellRenderer.java:57)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.SapTableRowRenderer.renderSapTableRowFragment(SapTableRowRenderer.java:67)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.SapTableRowRenderer.render(SapTableRowRenderer.java:33)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.SapTableDefaultBodyRenderer.renderSapTableDefaultBodyFragment(SapTableDefaultBodyRenderer.java:96)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.SapTableDefaultBodyRenderer.render(SapTableDefaultBodyRenderer.java:29)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.SapTableRenderer.renderSapTableFragment(SapTableRenderer.java:394)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.SapTableRenderer.render(SapTableRenderer.java:49)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.GridLayoutRenderer.renderGridLayoutCellFragment(GridLayoutRenderer.java:609)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.GridLayoutRenderer.renderGridLayoutRowFragment(GridLayoutRenderer.java:312)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.GridLayoutRenderer.renderGridLayoutFragment(GridLayoutRenderer.java:250)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.GridLayoutRenderer.render(GridLayoutRenderer.java:57)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.ScrollContainerRenderer.renderScrollContainerFragment(ScrollContainerRenderer.java:235)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.ScrollContainerRenderer.render(ScrollContainerRenderer.java:41)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.ViewContainerRenderer.renderViewContainerFragment(ViewContainerRenderer.java:93)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.ViewContainerRenderer.render(ViewContainerRenderer.java:33)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.GridLayoutRenderer.renderGridLayoutCellFragment(GridLayoutRenderer.java:609)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.GridLayoutRenderer.renderGridLayoutRowFragment(GridLayoutRenderer.java:312)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.GridLayoutRenderer.renderGridLayoutFragment(GridLayoutRenderer.java:250)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.GridLayoutRenderer.render(GridLayoutRenderer.java:57)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.ScrollContainerRenderer.renderScrollContainerFragment(ScrollContainerRenderer.java:235)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.ScrollContainerRenderer.render(ScrollContainerRenderer.java:41)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.ViewContainerRenderer.renderViewContainerFragment(ViewContainerRenderer.java:93)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.ViewContainerRenderer.render(ViewContainerRenderer.java:33)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.UiWindowRenderer.render(UiWindowRenderer.java:32)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
     at com.sap.tc.webdynpro.clientimpl.html.client.HtmlClient.sendHtml(HtmlClient.java:454)
     at com.sap.tc.webdynpro.clientimpl.html.client.HtmlClient.sendResponse(HtmlClient.java:286)
     at com.sap.tc.webdynpro.clientimpl.html.client.HtmlClient.sendResponse(HtmlClient.java:178)
     at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.execute(WebDynproMainTask.java:632)
     at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:57)
     at com.sap.tc.webdynpro.clientserver.cal.ClientManager.doProcessing(ClientManager.java:249)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doWebDynproProcessing(DispatcherServlet.java:139)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:101)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doPost(DispatcherServlet.java:45)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:383)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:263)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:333)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:311)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:811)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:235)
     at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)
     at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:147)
     at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37)
     at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71)
     at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:94)
     at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:144)

Hi Jurgen,
Can you please explain what you are trying to do in detail. Do you want to create a Node dynamically in the context or, you want to populate a Node in a Context???
The stack trace, does not reveal what you want to do with the value object!
Thanks and Regards,
Vishnu Prasad Hegde

Populating an empty cluster in an object on the fly

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