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Update sequence docs.

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This commit is contained in:
Bruce Momjian 2005-10-03 02:46:43 +00:00
parent f20cad7870
commit f890004cc1
1 changed files with 15 additions and 15 deletions
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doc/src/sgml/release.sgml
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@ -1,5 +1,5 @@
<!--
$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:
@ -398,28 +398,28 @@ pg_[A-Za-z0-9_] <application>
</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) || '.' ||