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Commitff8d68d

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Included is an example of using savepoints in a non-trivial example.
Giving examples in the SQL command reference is hard because we don'thave conditionals at the SQL level.Gavin Sherry
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‎doc/src/sgml/ref/begin.sgml

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<!--
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$PostgreSQL: pgsql/doc/src/sgml/ref/begin.sgml,v 1.31 2004/08/01 17:32:13 tgl Exp $
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$PostgreSQL: pgsql/doc/src/sgml/ref/begin.sgml,v 1.32 2004/08/08 01:48:31 momjian Exp $
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PostgreSQL documentation
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-->
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@@ -100,6 +100,9 @@ BEGIN [ WORK | TRANSACTION ]
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<para>
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Issuing <command>BEGIN</> when already inside a transaction block will
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provoke a warning message. The state of the transaction is not affected.
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To nest transactions within a transaction block, use savepoints
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(See <xref linkend="sql-start-transaction" endterm="sql-start-transaction-title">
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for more information).
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</para>
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</refsect1>
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‎doc/src/sgml/ref/update.sgml

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

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