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From stack <st...@duboce.net>
Subject Re: Announcing OHM a new Client Interface Tool for HBase
Date Fri, 16 Jan 2009 18:03:14 GMT
Thats excellent Charles.  Please be sure to add it to this page: 
http://wiki.apache.org/hadoop/SupportingProjects
St.Ack

P.S. Misspelling of hadoop on ohm home page.
P.P.S Perhaps remove the spaces in filenames and directories?


Charles Mason wrote:
> Hi All,
>
> I wanted to let everyone know about a new tool I have created for
> HBase. I mentioned it on this list a few months back, we have now
> released the first version. My company are going to be using HBase in
> an upcoming project and in the process we built an interface tool for
> HBase. We have dicided to open source it under the Apache 2.0 license
> in the hope it will be useful to others.
>
> OHM stands for the Object HBase Mapper. Its basically a lightweight
> weakly relational ORM for HBase. The developer sets out the structure
> of their DB tables in one or more OHM Spec files. These have straight
> forward C like syntax which describes the tables, column families and
> column data types.
>
> These OHM Spec files are fed into the OHM Compiler which then
> generates a Syntax Tree and from that it generates code in the
> programing language of choice. At present we only have code generation
> support for CSharp, although we will need to implement Java for this
> project as well, so Java support should be added soon.
>
> Its relatively simple to add support for other languages. The compiler
> is written in Java and each language generator simply walks the Syntax
> Tree creating useful bean like objects which are then added to a
> Velocity context and exposed to the Velocity template, which generates
> the code. We have used the Thrift API for interacting with HBase in
> the CSharp generated code.
>
> We have just launched a site for the project at the address below. The
> site also contains some tutorials which show the basics of using OHM
> and provide a good way to get a feel for that it does. We also have a
> public Git repo so people can track the project easily.
>
> http://belowdeck.kissintelligentsystems.com/ohm
>
> Currently OHM provides the below features:
>
> 	* Efficient CRUD operations on rows and their columns.
>
> 	* Type conversion in to the languages native
> 	  types e.g. float, int, string.
>
> 	* Indexing of additional Column Family Fields.
>
> 	* Scanners to access multiple rows.
>
>
> I would really like to get everyone thoughts and feedback. We would of
> course welcome any code contributions if anyone is interested.
>
> Charlie M
>   


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