Dynamic filed -column mapping

Hi,
I'm evaluating the latest Kodo JDO and am facing some problem mapping our
existing data model.
What we need is a dynamic field to table column mapping, i.e, I would like
to define a Map within my class that can hold an arbitrary number of
column names and values, and have these peristed and/read. I am not sure
how, if at all, if I can use the custom class/field mapping to achieve
this.
Just to make things more clear, I'm looking for a way to implment a
MyClass.getValue(fieldName), and MyClass.setValue(fieldName,fieldValue)
API, where the possible set of of field names can only be known at run
time.
Thanks for any help!!
Anoop

Thank you. I understand that if I define my own classmapping , override
the insert(), update(), delete and probably a few other functions to
determine the SQL queries, I hould be there. I probably need to define a
FieldMetaData too, right?
How could I go about implementing the lazy loading, or fetch groups,
though? As I see it, the custom class mappings only provide a way to load
the entire data of a JDO.
I realise this is stretching the limits of JDO, but I hope I'm right in
assuming that once the above is in place, it would be possible to leverage
the benefits of caching, clustering and transaction management provided by
the JDO implementation.
Thanks,
Anoop
Patrick Linskey wrote:
You probably could put together a custom field mapping to achieve this.
However, note that this is not a use case that Kodo is intended for.
It is likely that it would be possible to put together a custom field
mapping that would properly deal with queries, and maybe even one that
could handle lazy loading.
-Patrick
On Wed, 04 Jun 2003 15:05:23 +0000, Anoop wrote:
Hi,
I'm evaluating the latest Kodo JDO and am facing some problem mapping
our existing data model.
What we need is a dynamic field to table column mapping, i.e, I would
like to define a Map within my class that can hold an arbitrary number
of column names and values, and have these peristed and/read. I am not
sure how, if at all, if I can use the custom class/field mapping to
achieve this.
Just to make things more clear, I'm looking for a way to implment a
MyClass.getValue(fieldName), and MyClass.setValue(fieldName,fieldValue)
API, where the possible set of of field names can only be known at run
time.
Thanks for any help!!
Anoop
Patrick Linskey
SolarMetric Inc.

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Example of how to dynamically create DataGridColumns
A completely dynamic DataGrid example.
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<?xml version="1.0" encoding="utf-8"?>

<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="vertical"
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<mx:Script><![CDATA[
import mx.controls.dataGridClasses.DataGridColumn;
import mx.controls.DataGrid;
import mx.collections.XMLListCollection;
import mx.controls.Alert;
[Bindable]
private var _xlcCatalog:XMLListCollection; //the
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public function initApp():void
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buildDG(); //creates the dataGrid
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var dgc:DataGridColumn;
var aColumnsNew:Array = dg.columns
var iTotalDGWidth:int = 0;
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oColumnDef = aColumnDef
dgc = new DataGridColumn(); //instantiate a new
DataGridColumn
dgc.dataField = oColumnDef.dataField; //start setting the
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dgc.width = oColumnDef.width;
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dg.editable = true;
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}//buildDG
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private function getColumnDefArray():Array
//Alert.show("colcount:" + xmlCatalog.toXMLString());
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var node0:XML = xmlCatalog.product[0]; //get the first
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nodes (columns) as an XMLList
var xmlColumn:XML
var oColumnDef:Object;
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xmlColumn = xlColumns;
oColumnDef = new Object();
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case "name":
oColumnDef.width = 80;
oColumnDef.sortable = false;
oColumnDef.visible = true;
oColumnDef.editable = false;
oColumnDef.wordWrap = false;
break;
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oColumnDef.width = 200;
oColumnDef.sortable = false;
oColumnDef.visible = true;
oColumnDef.editable = false;
oColumnDef.wordWrap = true;
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oColumnDef.width = 40;
oColumnDef.sortable = true;
oColumnDef.visible = true;
oColumnDef.editable = true;
oColumnDef.wordWrap = false;
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oColumnDef.visible = false;
oColumnDef.editable = false;
oColumnDef.wordWrap = false;
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oColumnDef.sortable = true;
oColumnDef.visible = true;
oColumnDef.editable = false;
oColumnDef.wordWrap = false;
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}//getColumnDefArray
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<catalog>
<product productId="1">
<name>Nokia 6010</name>
<description>Easy to use without sacrificing style,
the Nokia 6010 phone offers functional voice communication
supported by text messaging, multimedia messaging, mobile internet,
games and more</description>
<price>99.99</price>
<image>assets/pic/Nokia_6010.gif</image>
<series>6000</series>
<triband>false</triband>
<camera>false</camera>
<video>false</video>
<highlight1>MMS</highlight1>
<highlight2>Large color display</highlight2>
</product>
<product productId="2">
<name>Nokia 3100 Blue</name>
<description>Light up the night with a
glow-in-the-dark cover - when it's charged with light you can
easily find your phone in the dark. When you get a call, the Nokia
3100 phone flashes in tune with your ringing tone. And when you
snap on a Nokia Xpress-on™ gaming cover*, you'll get
luminescent light effects in time to the gaming
action.</description>
<price>139</price>
<image>assets/pic/Nokia_3100_blue.gif</image>
<series>3000</series>
<triband>true</triband>
<camera>false</camera>
<video>false</video>
<highlight1>Glow-in-the-dark</highlight1>
<highlight2>Flashing lights</highlight2>
</product>
<product productId="3">
<name>Nokia 3100 Pink</name>
<description>Light up the night with a
glow-in-the-dark cover - when it's charged with light you can
easily find your phone in the dark. When you get a call, the Nokia
3100 phone flashes in tune with your ringing tone. And when you
snap on a Nokia Xpress-on™ gaming cover*, you'll get
luminescent light effects in time to the gaming
action.</description>
<price>139</price>
<image>assets/pic/Nokia_3100_pink.gif</image>
<series>3000</series>
<triband>true</triband>
<camera>false</camera>
<video>false</video>
<highlight1>Glow-in-the-dark</highlight1>
<highlight2>Flashing lights</highlight2>
</product>
<product productId="4">
<name>Nokia 3120</name>
<description>Designed for both business and pleasure,
the elegant Nokia 3120 phone offers a pleasing mix of features.
Enclosed within its chic, compact body, you will discover the
benefits of tri-band compatibility, a color screen, MMS, XHTML
browsing, cheerful screensavers, and much more.</description>
<price>159.99</price>
<image>assets/pic/Nokia_3120.gif</image>
<series>3000</series>
<triband>true</triband>
<camera>false</camera>
<video>false</video>
<highlight1>Multimedia messaging</highlight1>
<highlight2>Animated screensavers</highlight2>
</product>
<product productId="5">
<name>Nokia 3220</name>
<description>The Nokia 3220 phone is a fresh new cut
on some familiar ideas - animate your MMS messages with cute
characters, see the music with lights that flash in time with your
ringing tone, download wallpapers and screensavers with matching
color schemes for the interface.</description>
<price>159.99</price>
<image>assets/pic/Nokia_3220.gif</image>
<series>3000</series>
<triband>false</triband>
<camera>true</camera>
<video>false</video>
<highlight1>MIDI tones</highlight1>
<highlight2>Cut-out covers</highlight2>
</product>
</catalog>
</mx:XML>
</mx:Application>

It should work the same way.
What problem are you having?
Tracy

Header description of dynamic data columns dynamically

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Harry

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Hi.
How to dynamically set column name in Answers, for example I want to put presentation variable in column header. Is this possible?
Regards,
Goran Ocko
http://108obiee.blogspot.com/

May be a rude way .. but it works.
Add narrative view and use Java script to change the column headings based on the variables.
<script language="javascript" type="text/javascript">
var a = document.getElementById('idResultsTableParent');
var rows= a.getElementsByTagName('tr');
rows[1].cells[1].innerText ="@{Presentation Variable}";
</script>
Editing the same post to remove irrelevant information.
- Girish

Column-map in weblogic-cmp-rdbms-jar.xml

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The relationship I specified is table1-has-many-table2. This is a 1 to m relation
and
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I specified the following column-map
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<key-column>id</key-column>
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But the server is throwing an exception that all the columns in table2 should
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Is this case handled in weblogic server implementation?.
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Hello Sathish,
Glad to help! Have a wonderful week.
Best regards,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
"Sathish Kandacharam" <[email protected]> wrote:
>
Hi Ryan,
Thanks alot. That example helped alot.
Thanks,
Sathish
"Ryan LeCompte" <[email protected]> wrote:
Hello Sathish,
Please refer to the sample code that comes packaged with BEA WebLogic
Server for
examples of how the weblogic-cmp-rdbms-jar.xml file should look forall
of the
various relationships. In particular, look at the Bands example.
Best regards,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
"Sathish Kandacharam" <[email protected]> wrote:
Hi,
How to specify column-map for the following database tables:
Table1: id,col2,col3. Primary key - id.
Table2: m_id,description,col4,col5. Primay key - (m_id,col4).
The relationship I specified is table1-has-many-table2. This is
a
1 to m relation
and
Table1.id = Table2.m_id.
I specified the following column-map
<column-map>
<foreign-key-column>m_id</foreign-key-column>
<key-column>id</key-column>
</column-map>
But the server is throwing an exception that all the columns intable2
should
me mapped.
But in this case, I can join the tables with just id only. Whatshould
I specify
for col4 map?.
I can just reverse the mapping, but I am trying to test the boundaries
of weblogic
server.
Is this case handled in weblogic server implementation?.
I am testing relationship-role-map for ejb2.0 on weblogic server8.1
beta version.
Thanks,
Sathish

Dynamic Lead Columns / Data Columns

Hi
I want to use dyanmic data columns restricted by a characteristic relationship of another variable.
When I use the characteristic as a lead column, it works perfect, I only see the rows for valid lines.
When I use the characteristic as a data column, I see all possible characteristic values of that characteristics. The ones that are not valid are not ready for input, the ones that are valid are ready for input.
I would like to use dynamic data columns but only display the columns with a valid characteristic relationships (just the way it works when I put the characteristic in the lead column)
Should that work?
Thanks

Enable Zero-Suppression on your column structure. Then in your Query properties, enable zero-suppresion for columns. That way only characteristic values with data will be shown and not all possible characteristic values present in the master data tables. I should note that there should be some data in the fact table which links the keyfigure to the characteristic value, otherwise it will be suppressed.

Dynamic filed -column mapping

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