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Included is an example of using savepoints in a non-trivial example.

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Giving examples in the SQL command reference is hard because we don't
have conditionals at the SQL level.

Gavin Sherry
This commit is contained in:
Bruce Momjian
2004-08-08 01:48:31 +00:00
parent 51fa8b0120
commit ff8d68df5c
2 changed files with 18 additions and 2 deletions
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15
doc/src/sgml/ref/update.sgml
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@@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/update.sgml,v 1.29 2004/06/09 19:08:13 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/update.sgml,v 1.30 2004/08/08 01:48:31 momjian Exp $
PostgreSQL documentation
-->
@@ -187,6 +187,19 @@ UPDATE employees SET sales_count = sales_count + 1 FROM accounts
<programlisting>
UPDATE employees SET sales_count = sales_count + 1 WHERE id =
(SELECT sales_person FROM accounts WHERE name = 'Acme Corporation');
</programlisting>
Attempt to insert a new stock item along with the quantity of stock. If
the item exists, update the stock count of the existing item. To do this,
use savepoints.
<programlisting>
BEGIN;
SAVEPOINT sp1;
INSERT INTO wines VALUES('Chateau Lafite 2003', '24');
-- Check for unique violation on name
ROLLBACK TO sp1;
UPDATE wines SET stock = stock + 24 WHERE winename='Chateau Lafite 2003';
COMMIT;
</programlisting>
</para>
</refsect1>