Lock against Inserts

From: Bill Buchan <wbuchan_at_uk.intasys.com>
Date: Thu, 25 Jul 2002 10:08:47 -0800
Message-ID: <F001.004A2930.20020725100847@fatcity.com>

I have a transaction which issues LOCK TABLE <TABLE> IN EXCLUSIVE MODE. This is to prevent INSERTs during processing.

However this is way too restrictive - we only need to restrict certain types of insert, eg. where col1 = 123.

I can do something like SELECT * FROM TABLE WHERE col1 = 123 FOR UPDATE to prevent updates of existing rows of this type, but this will not block further inserts.

I could set up an insert trigger to prevent these inserts, but I don't want to error: just wait until the transaction ends. This would appear to make the trigger code too complex - surely there is a way to do this just with simple locks?

Any ideas much appreciated!

Thanks
- Bill.

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Author: Bill Buchan
  INET: wbuchan_at_uk.intasys.com

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