<!--
-$PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.383 2005/10/03 02:21:16 momjian Exp $
+$PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.384 2005/10/03 02:46:43 momjian Exp $
Typical markup:
</para>
<para>
In previous releases, <function>nextval()</>,
- <function>currval</>, and <function>setval()</> recorded
- sequence names as simple text strings, meaning that renaming or
- dropping a sequence used in a <command>DEFAULT</> made the
- clause invalid. This release stores all newly-created sequence
- function arguments using internal OIDs, allowing them to handle
- sequence renaming, and adding dependency information that
- prevents improper sequence removal. It also makes
- <command>DEFAULT</> clauses immune to schema search
- path changes.
+ <function>currval</>, and <function>setval()</> recorded sequence
+ names as simple text strings, meaning that renaming or dropping a
+ sequence used in a <command>DEFAULT</> clause made the clause
+ invalid. This release stores all newly-created sequence function
+ arguments as internal OIDs, allowing them to handle sequence
+ renaming, and adding dependency information that prevents
+ improper sequence removal. It also makes <command>DEFAULT</>
+ clauses immune to schema search path changes, and allows schema
+ renaming.
</para>
<para>
Some applications might rely on the old text-based behavior of
- run-time lookup of the sequence name. This can still be done by
+ run-time lookup for sequence names. This can still be done by
casting the argument to <type>text</>, for example
<literal>nextval('myseq'::text)</>.
</para>
<para>
Pre-8.1 schemas loaded into 8.1 will use the previous, text-based
- representation and therefore will not have these protections.
- However, it is possible to upgrade a database to the newer
- OID-based arguments. First, save this query into a file, such as
- <filename>fixseq.sql</>:
+ representation and therefore will not have the features of
+ OID-stored arguments. However, it is possible to upgrade a
+ database loaded with pre-8.1 schemas. First, save this query into
+ a file, such as <filename>fixseq.sql</>:
<programlisting>
SELECT 'ALTER TABLE ' ||
pg_catalog.quote_ident(n.nspname) || '.' ||