On Jul 25, 2008, at 11:46 AM, Francisco Reyes wrote:
Is this normal or are there something else I could do so I don't have
to check if it exists?
I would say that it is normal.
For the developers: a combined insert/update command would be nice
:-)
Mysql has such a beast along a some other non SQL compliant
extensions.
MERGE isn't trivial, but the developers are well aware of the desire
for it.
One possible approach to what you are trying to do would be:
update existing table with new values
delete from new table all records that already exist
insert remaining new records
Which can be done all in pure sql. No need to write a program.
Well... the race conditions may bite you there, if you have concurrent
access.
This - http://www.postgresql.org/docs/8.3/static/plpgsql-control-structures.html#PLPGSQL-UPSERT-EXAMPLE
- is the usual approach suggested for a concurrent-access safe
upsert/merge right now.
Cheers,
Steve
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