database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-08-30 06:01:21 +03:00
Code Activity

Department of second thoughts: make checks for replacing a view slightly

Browse Source 
more flexible, and improve the error reporting.  Also, add documentation
for REPLACE RULE/VIEW.
This commit is contained in:
Tom Lane
2002-09-02 20:04:40 +00:00
parent b4d24d78a9
commit 8f60f43f2e
5 changed files with 84 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
doc/src/sgml/ref/create_rule.sgml
View File

@@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_rule.sgml,v 1.36 2002/05/18 15:44:47 petere Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_rule.sgml,v 1.37 2002/09/02 20:04:39 tgl Exp $
PostgreSQL documentation
-->
@@ -21,17 +21,15 @@ PostgreSQL documentation
<date>2001-01-05</date>
</refsynopsisdivinfo>
<synopsis>
CREATE RULE <replaceable class="parameter">name</replaceable> AS ON <replaceable class="parameter">event</replaceable>
CREATE [ OR REPLACE ] RULE <replaceable class="parameter">name</replaceable> AS ON <replaceable class="parameter">event</replaceable>
TO <replaceable class="parameter">table</replaceable> [ WHERE <replaceable class="parameter">condition</replaceable> ]
DO [ INSTEAD ] <replaceable class="parameter">action</replaceable>
where <replaceable class="PARAMETER">action</replaceable> can be:
NOTHING
|
<replaceable class="parameter">query</replaceable>
|
( <replaceable class="parameter">query</replaceable> ; <replaceable class="parameter">query</replaceable> ... )
| <replaceable class="parameter">query</replaceable>
| ( <replaceable class="parameter">query</replaceable> ; <replaceable class="parameter">query</replaceable> ... )
</synopsis>
<refsect2 id="R2-SQL-CREATERULE-1">
@@ -76,9 +74,10 @@ NOTHING
<term><replaceable class="parameter">condition</replaceable></term>
<listitem>
<para>
Any SQL conditional expression (returning <type>boolean</type>). The condition expression may not
Any SQL conditional expression (returning <type>boolean</type>).
The condition expression may not
refer to any tables except <literal>new</literal> and
<literal>old</literal>.
<literal>old</literal>, and may not contain aggregate functions.
</para>
</listitem>
</varlistentry>
@@ -142,6 +141,14 @@ CREATE RULE
Description
</title>
<para>
<command>CREATE RULE</command> defines a new rule applying to a specified
table or view.
<command>CREATE OR REPLACE RULE</command> will either create a
new rule, or replace an existing rule of the same name for the same
table.
</para>
<para>
The <productname>PostgreSQL</productname>
<firstterm>rule system</firstterm> allows one to define an
@@ -318,7 +325,7 @@ UPDATE mytable SET name = 'foo' WHERE id = 42;
</title>
<para>
<command>CREATE RULE</command> statement is a <productname>PostgreSQL</productname>
<command>CREATE RULE</command> is a <productname>PostgreSQL</productname>
language extension.
There is no <command>CREATE RULE</command> statement in <acronym>SQL92</acronym>.
</para>