Обсуждение: reading last inserted record withoud any autoincrement field
<table border="0" cellpadding="0" cellspacing="0"><tr><td style="font: inherit;" valign="top">How can get last inserted recordin a table without any autoincrement filed?<br />I need to frequently fetch the last inserted record.<br />If I mustuse the "Cursor" please explain your solution.<br /></td></tr></table><br />
2009/10/4 mohammad qoreishy <m_qoreishy@yahoo.com> > > How can get last inserted record in a table without any autoincrement filed? > I need to frequently fetch the last inserted record. > If I must use the "Cursor" please explain your solution. > RETURNING clause? http://www.postgresql.org/docs/current/interactive/sql-insert.html Osvaldo
Osvaldo Kussama wrote: > 2009/10/4 mohammad qoreishy <m_qoreishy@yahoo.com> > >> How can get last inserted record in a table without any autoincrement filed? >> I need to frequently fetch the last inserted record. >> If I must use the "Cursor" please explain your solution. >> >> > > > RETURNING clause? > http://www.postgresql.org/docs/current/interactive/sql-insert.html > > Osvaldo > > It took the OP to mean last insert as in randomly in the past, not as part of current transaction. My fear is OP's schema has no way of identifying time-of-insert, nor a monotonically increasing record id and is hoping postgres has a some internal value that will return the most recently inserted record. Without a table definition it's hard to say.
On Sun, Oct 4, 2009 at 1:34 PM, Rob Sargent <robjsargent@gmail.com> wrote: > Osvaldo Kussama wrote: >> >> 2009/10/4 mohammad qoreishy <m_qoreishy@yahoo.com> >> >>> >>> How can get last inserted record in a table without any autoincrement >>> filed? >>> I need to frequently fetch the last inserted record. >>> If I must use the "Cursor" please explain your solution. >>> >>> >> >> >> RETURNING clause? >> http://www.postgresql.org/docs/current/interactive/sql-insert.html >> >> Osvaldo >> >> > > It took the OP to mean last insert as in randomly in the past, not as part > of current transaction. My fear is OP's schema has no way of identifying > time-of-insert, nor a monotonically increasing record id and is hoping > postgres has a some internal value that will return the most recently > inserted record. Without a table definition it's hard to say. Given that he's mentioning cursors, I'm guessing he's talking about during this session / transaction. So returning would be best. Note that returning returns a SET of results, so that if your insert inserts 10 rows, you'll get back 10 rows from returning.