Hi all,
I am currently trying to estimate the effort required
to implement Oracle type stored procedure in
PostgreSQL. As I understood Oracle supports both
functions and procedures, but postgres only functions.
ALso there are no OUT parameter in postgres.
I got some info from http://www.compiere.org/technology/pg/porting.html
Please be careful taking information from other websites as given. The view described there is Oracle-centric, and doesn't necessarily reflect PostgreSQL's need.
After a quick glance, just one aspect:
PostgreSQL indeed does not have default values for function parameters, but there are overloaded functions.
so instead of
function foo(bar text, nextbar text='someDefault')
you have function foo(bar text, nextbar text) and function foo(bar text) as 'select function(bar, 'someDefault')
which gives the same result. That's why PostgreSQL doesn't need default values.
Stored procedures:
There actually is a way to return multiple values from a function, using a set. So procedure foo(bar int IN, result1 text OUT, result2 text OUT)
can be converted to a function foo(bar) RETURNS record
which can be retrieved as SELECT result1, result2 FROM foo(bar) AS prc(result1 text, result2 text)
This might be supportable by wrapping it syntactically.
Some weeks ago we had a discussion about Oracle syntax support (or "loadable personality" support). The thread is named "LinuxTag wrapup" and started July 3rd, you might want to review it.
Regards, Andreas
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