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From "Patrick Linskey" <plins...@bea.com>
Subject RE: schema generation, OpenJPA vs. Toplink
Date Mon, 19 Mar 2007 02:22:09 GMT
Jeff,

Just to clarify, OpenJPA does support directly creating a DDL file or
altering a schema from the information that you provide in annotations.

-Patrick

-- 
Patrick Linskey
BEA Systems, Inc. 

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> -----Original Message-----
> From: Marc Prud'hommeaux [mailto:mprudhomapache@gmail.com] On 
> Behalf Of Marc Prud'hommeaux
> Sent: Friday, March 16, 2007 10:48 AM
> To: open-jpa-dev@incubator.apache.org
> Subject: Re: schema generation, OpenJPA vs. Toplink
> 
> Jeff-
> 
> OpenJPA provides the ability to generate a schema to an intermediate  
> XML file, but it doesn't require it. You can also create the schema  
> directly against the database.
> 
> Using the intermediate XML file can be useful if you want to 
> generate  
> the schema, but then make additional modifications to it 
> (like adding  
> indexes) before actually building the schema against the 
> database. It  
> can also be useful to capture the schema locally, since OpenJPA can  
> be configured to validate mappings against the schema file rather  
> than validating it against database metadata (which can sometimes be  
> slow).
> 
> For example scenarios for using the mappingtool, see:
> 
>    http://incubator.apache.org/openjpa/docs/latest/manual/ 
> manual.html#ref_guide_mapping_mappingtool_examples
> 
> 
> 
> On Mar 16, 2007, at 10:43 AM, jeff wrote:
> 
> > i'm new here, so please excuse if this is a stupid question ...
> >
> > from my cursory look at OpenJPA, it seems that it takes a 
> different  
> > approach to schema generation than TopLink.
> >
> > Toplink generates a schema from annotations, where OpenJPA 
> requires  
> > one to provide a DB-neutral XML schema file. do i have that right?
> >
> > i am trying to understand the advantages of OpenJPA's approach.  
> > from my naive standpoint right now, it seems less than optimal. if  
> > the metadata is already captured in annotations, why require it to  
> > be defined in the schema XML file?
> >
> > am i missing something?
> > thanks.
> >
> >
> >
> >
> > ---------------------------------
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