Re : Am I overseen ?

I think this is not the way I should go.

My application is a database prototype design tool that also is able to
run the design because the designer it self is a design.

So I did not only need a DDL to create the target application's
database, also I need to feed a model into the system database
that specifies the model at GUI level. (Data in general means)

Therefore I have choosen the XMI / XML / XSLT approach to get SQL
scripts at once.

When there is a way to optionally add columns to existing tables via
SQL I have very less development needs to get this working.
If I do read the XML model into a DOM tree or use extarnal tools I
probably have more to work on a solution.

But thanks, it may help somehow. I'll have a look.

Lothar

Am 18.10.2007 um 19:41 schrieb Laurent ROCHE:

Hi,

You might want to have a look at DdlUtils that does similar things
that you want to do: compare databases schemas using XML files and
synchronising the schemas.
Interesting tool ! !

http://db.apache.org/ddlutils/

 
Have fun,
L@u
The Computing Froggy

----- Message d'origine ----
De : Scott Marlowe <scott.marlowe@gmail.com>
À : Lothar Behrens <lothar.behrens@lollisoft.de>
Cc : pgsql-general@postgresql.org
Envoyé le : Jeudi, 18 Octobre 2007, 18h22mn 12s
Objet : Re: [GENERAL] Am I overseen ?

On 10/18/07, Lothar Behrens <lothar.behrens@lollisoft.de> wrote:

On 18 Okt., 17:17, br...@zijn-digital.com (brian) wrote:

Lothar Behrens wrote:

Hi,

Several groups I post most of them does not answer.
Did noone see my postings ?

Please at least give me one answer :-)

Thanks, Lothar

ping

What was your query?

I do convert an UML XMI model to a database script to create the
database schema.
To enable multiple iterations I need conditional alter table add
column like syntax.

For sample:

if not exsist column a in table b then
  alter table b add a char(100);

Is there any way to do this ?

What kind of tools are you familiar with?  I'm guessing you could
write something in perl or php to do it.  Or do you want to do it in
sql?  I'm sure you could do it in plpgsql or some other pl/language,
if you want it all in the db.

But I'm not that familiar with UML as to say what's the best approach.

Normally when you get thundering silence, you've asked a question no
one feels real qualified to answer, and rather than answer it halfway,
they just leave it for the next guy to get.

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Lothar Behrens | Rapid Prototyping ...
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73252 Lenningen | www.lollisoft.de

Lothar Behrens <lothar.behrens@lollisoft.de> writes:

When there is a way to optionally add columns to existing tables via
SQL I have very less development needs to get this working.

Why don't you just issue the ALTER ADD COLUMN and ignore the error
if it's duplicate column?

Or if you don't like that, it's not that hard to look into the system
catalogs and see if the column already exists. A program bright enough
to be issuing dynamic DDL commands ought to be able to do that ...

regards, tom lane