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List:       postgresql-sql
Subject:    Re: [SQL] Migrate to Postgres - Alias a Keyword?
From:       Torsten Zuehlsdorff <foo () meisterderspiele ! de>
Date:       2013-03-05 13:45:44
Message-ID: 5135F708.4070100 () meisterderspiele ! de
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Hi,

> We are migrating from Firebird to Postgres. We try to minimise changes
> required to the application code which has lots of SQLs in it. One of
> the incompatibilities between these two is the way to limit the number
> of rows returned by a SELECT query.
>
> In Postgres, /SELECT * FROM TestTable LIMIT 10/
> In Firebird, /SELECT * FROM TestTable ROWS 10/
>
> What I'm trying to do here is to get Postgres to accept ROWS as if it's
> LIMIT. Looks like this is possible by adding an alias
> in /src/include/parser/kwlist.h, although ROWS is already defined in it
> for other purpose.
>
> Does anyone has a suggestion on this? Can I achieve this without
> recompiling our own copy of Postgres?

i would hack the application, if there is database-layer in. For 
problems like this i created the DDDBL (PHP, documentation in german, 
sorry). It is a layer between application and database with full 
controll over the queries and their result.

This is exactly the point to manipulate the SQL. There are many pitfalls 
- like LIMIT as part of a relation, constant, etc - but it will work.

Greetings from Germany,
Torsten


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