Re: [SQL] converting Oracle scripts to PostgreSQL

[Clint Stotesbery]

Hi Gary,
I went through a conversion from Oracle to PostgreSQL about 9 months ago.
There's a little bit of documentation in the PostgreSQL manual
http://www.postgresql.org/docs/7.4/interactive/plpgsql-porting.html
or
http://www.postgresql.org/docs/8.0/interactiveplpgsql-porting.html
I had ment to submit docs to the manual but never got around to it since 
they could definately be expanded. The biggest issues I had for my project 
was that there were no statement level triggers and you couldn't do instead 
of triggers on views if my memory serves correct. plpgsql is really similar 
to Oracle plsql and in many cases you don't need to even change syntax. I 
could even you send the work I did since it was for school if you are 
interested.

The reference manual for plpgsql can be found at:
http://www.postgresql.org/docs/7.4/interactive/plpgsql.html
or
http://www.postgresql.org/docs/8.0/interactive/plpgsql.html
Installing procedural languages:
http://www.postgresql.org/docs/7.4/interactive/xplang.html
or
http://www.postgresql.org/docs/8.0/interactive/xplang.html
triggers:
http://www.postgresql.org/docs/7.4/interactive/triggers.html
or
http://www.postgresql.org/docs/8.0/interactive/triggers.html
rules:
http://www.postgresql.org/docs/7.4/interactive/rules.html
or
http://www.postgresql.org/docs/8.0/interactive/rules.html
sql command syntax (for scripts):
http://www.postgresql.org/docs/7.4/interactive/sql-commands.html
or
http://www.postgresql.org/docs/8.0/interactive/sql-commands.html
Also try searching the mailing here:
http://archives.postgresql.org/pgsql-sql/
You will probably find many of my old posts when I was converting Oracle to 
PostgreSQL. Hope this helps you get started.
-Clint

Original Message Follows
From: "Gary Broadbent" <[EMAIL PROTECTED]>
Reply-To: <[EMAIL PROTECTED]>
To: 
Subject: [SQL] converting Oracle scripts to PostgreSQL
Date: Wed, 19 Jan 2005 12:37:48 -
Hi,
I have a database in Oracle that I want to convert to PostgreSQL.
I have exported the scripts used to create the tables, constraints and
sequences in Oracle and wish to convert these to postgreSQL scripts now.
Is there an easy way to do this?
Regards,
Gary.

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Re: [SQL] converting Oracle scripts to PostgreSQL

[Dennis Sacks]

Gary Broadbent wrote:
Hi,
I have a database in Oracle that I want to convert to PostgreSQL.
I have exported the scripts used to create the tables, constraints and
sequences in Oracle and wish to convert these to postgreSQL scripts now.
Is there an easy way to do this?
 

These aren't too hard (stored procedures are what can be a bit more 
tricky). Here are some hints I've gotten in my notes. I'm sure there is 
more:

data types -
number can be changed to decimal
date should be changed to timestamp (oracle's date has time, 
postgresql's doesn't)
varchar2 needs to be changed to varchar

There may be optimizer hints for oracle that are part of the table 
definitions - you'll need to remove those.

Sequences are pretty close. I think I had to get rid of "NOORDER" and 
change "NOCYCLE" to "NO CYCLE" and add "MINVALUE 0" since the Oracle 
sequence specified "START WITH 0" in this example:

Oracle:
CREATE SEQUENCE ABC_DEP_SEQ INCREMENT BY 1 START WITH 0 NOCYCLE CACHE 20 
NOORDER;

Postgresql:
CREATE SEQUENCE ABC_DEP_SEQ INCREMENT BY 1 START WITH 0 MINVALUE 0 NO 
CYCLE CACHE 20 ;

Queries:
Queries may need to be rewritten if they use the Oracle syntax for outer 
joins. Also the NVL function can be replaced with coalesce and DECODE 
will need to be rewritten with CASE.

SYSDATE can be replaced with NOW()
Also check out this doc for more hints:
http://www-2.cs.cmu.edu/~pmerson/docs/OracleToPostgres.pdf
Dennis Sacks
[EMAIL PROTECTED]

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[SQL] converting Oracle scripts to PostgreSQL

[Gary Broadbent]

Hi,

I have a database in Oracle that I want to convert to PostgreSQL.

I have exported the scripts used to create the tables, constraints and
sequences in Oracle and wish to convert these to postgreSQL scripts now.

Is there an easy way to do this?

Regards,
Gary.



This email (and any attachments) is private and confidential, and is intended
solely for the addressee. If you have received this communication in error
please remove it and inform us via telephone or email.

Although we take all possible steps to ensure mail and attachments are free
from malicious content, malware and virii, we cannot accept any responsibility
whatsoever for any changes to content outwith our administrative bounds.

The views represented within this mail are solely the view of the
author and do not reflect the views of Graham Technology as a whole.


Graham Technology plc   http://www.gtnet.com



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