http://www.datanucleus.org (Forum: Excel Datastores)

Some general questions about using EXCEL as a data store

The manual describes how to store data in Excel sheets, but nothing is said about reading from Excel sheets. Is this now a one-way process, or can I acces information in existing Excel datastores? If so, is there a way of iterating over rows, and specifying columns symbolically? I have several spread sheets, where hundreds of rows are arranged in a table-like format and would like to read ...

Writing data to Excel from Java - the simple way

http://datanucleus.blogspot.com/2010/07/writing-data-to-excel-from-java-simple.html

Excel example

I've setup the samples and got it to work with mysql, but now I'm trying to get it to work with the Excel plugin and I can't get it to work. Do you know of a specific Excel datastore example? I might be interested in helping out on the project as well. Thanks, Jason

setResultClass not supported

It seems that this query [code]select anAttribute as anAlias into java.util.HashMap from SomeClass[/code] is supported by DN while the following [code]select count(this) as total into java.util.HashMap from SomeClass[/code] produces the following stack trace: [code] xception in thread "main" java.lang.NullPointerException at ...

Embedded objects

Are embedded objects supported by excel plugin ? Guido

DataNucleus JDO does not work with all standard SCO?

Hello there, I am a JDO newbie. I am learning to work with DataNucleus JDO using Excel file as datastore. It turns out that DN implementation does not work with all standard SCO types (as written in docs). For example, Long, Integer, int[], etc. does not work DN JDO using Excel as datastore. Do I need to provide anything like wrapper as specified ...

Nested Java Objects

Are nested objects supported for Excel reading and writing? If I had a Person object with with a List of Pet objects, is there anyway for the nested pet objects to be written to the same Excel row or on the next row? For example: Person {name=Jason, age=29, List (Pet1, Pet2)}, Pet1 {name = "Fido"}, Pet 2 {name ="Spot"} The ideal rows would be (i'll ...

DataNucleus Access Platform & Excel Getting Started fail

First of all, sorry for my bad English ;) I tried to use as datasource Excel file, i read tutorials and forum, but i have an error that i can`t understand. (my test project can be checked out from http://datanucleus-sandbox.googlecode.com/svn/trunk) --- My model is simple: [code]@PersistenceCapable(extensions=@Extension(vendorName="datanucleus", key="sheet", ...