Обсуждение: OID use
Here is essentially what I am trying to do: I want to have a 'serial' type column, so that it provides a unique identifier for records. However, when I do the insert, I need the know what value was assigned to that so I can use it in another table for reference, by doing another insert. I looked at the C API and found a function 'PQoidValue' which returns an Oid. I tried to find a place to use the Oid type, but could not. Is there a more efficient way of getting record information than executing a 'select * where ... oid=...'? And what restrictions should I be aware of when working with Oids? Regards, Jeff Davis
On Thu, 5 Oct 2000, Jeff Davis wrote: > Here is essentially what I am trying to do: > > I want to have a 'serial' type column, so that it provides a unique > identifier for records. However, when I do the insert, I need the know > what value was assigned to that so I can use it in another table for > reference, by doing another insert. When you have used your SERIAL, the currval() function holds the last value inserted. It's the only way to guarantee getting the correct value, especially when there's multiple sessions going on. Peter -- Peter T Mount peter@retep.org.uk http://www.retep.org.uk PostgreSQL JDBC Driver http://www.retep.org.uk/postgres/ Java PDF Generator http://www.retep.org.uk/pdf/