diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/ref/create_rule.sgml | 25 | ||||
| -rw-r--r-- | doc/src/sgml/ref/create_view.sgml | 21 | ||||
| -rw-r--r-- | doc/src/sgml/release.sgml | 3 |
3 files changed, 36 insertions, 13 deletions
diff --git a/doc/src/sgml/ref/create_rule.sgml b/doc/src/sgml/ref/create_rule.sgml index 86046359b4a..998d075a645 100644 --- a/doc/src/sgml/ref/create_rule.sgml +++ b/doc/src/sgml/ref/create_rule.sgml @@ -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> @@ -143,6 +142,14 @@ CREATE RULE </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 alternate action to be performed on inserts, updates, or deletions @@ -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> diff --git a/doc/src/sgml/ref/create_view.sgml b/doc/src/sgml/ref/create_view.sgml index aa7c869285f..1692f9f0f77 100644 --- a/doc/src/sgml/ref/create_view.sgml +++ b/doc/src/sgml/ref/create_view.sgml @@ -1,5 +1,5 @@ <!-- -$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_view.sgml,v 1.18 2002/05/18 15:44:47 petere Exp $ +$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_view.sgml,v 1.19 2002/09/02 20:04:39 tgl Exp $ PostgreSQL documentation --> @@ -21,7 +21,7 @@ PostgreSQL documentation <date>2000-03-25</date> </refsynopsisdivinfo> <synopsis> -CREATE VIEW <replaceable class="PARAMETER">view</replaceable> [ ( <replaceable +CREATE [ OR REPLACE ] VIEW <replaceable class="PARAMETER">view</replaceable> [ ( <replaceable class="PARAMETER">column name list</replaceable> ) ] AS SELECT <replaceable class="PARAMETER">query</replaceable> </synopsis> @@ -132,14 +132,22 @@ CREATE VIEW vista AS SELECT text 'Hello World' <title> Description </title> + <para> - <command>CREATE VIEW</command> will define a view of a query. + <command>CREATE VIEW</command> defines a view of a query. The view is not physically materialized. Instead, a query rewrite rule (an <literal>ON SELECT</> rule) is automatically generated to support SELECT operations on views. </para> <para> + <command>CREATE OR REPLACE VIEW</command> is similar, but if a view + of the same name already exists, it is replaced. You can only replace + a view with a new query that generates the identical set of columns + (i.e., same column names and data types). + </para> + + <para> If a schema name is given (for example, <literal>CREATE VIEW myschema.myview ...</>) then the view is created in the specified schema. Otherwise it is created in the current schema (the one @@ -206,6 +214,7 @@ SELECT * FROM kinds; <title> SQL92 </title> + <para> SQL92 specifies some additional capabilities for the <command>CREATE VIEW</command> statement: @@ -253,6 +262,12 @@ CREATE VIEW <replaceable class="parameter">view</replaceable> [ <replaceable cla </varlistentry> </variablelist> </para> + + <para> + <command>CREATE OR REPLACE VIEW</command> is a + <productname>PostgreSQL</productname> language extension. + </para> + </refsect2> </refsect1> </refentry> diff --git a/doc/src/sgml/release.sgml b/doc/src/sgml/release.sgml index 3ba21bc1ab7..d0fc445380c 100644 --- a/doc/src/sgml/release.sgml +++ b/doc/src/sgml/release.sgml @@ -1,5 +1,5 @@ <!-- -$Header: /cvsroot/pgsql/doc/src/sgml/release.sgml,v 1.156 2002/08/30 22:18:05 tgl Exp $ +$Header: /cvsroot/pgsql/doc/src/sgml/release.sgml,v 1.157 2002/09/02 20:04:39 tgl Exp $ --> <appendix id="release"> @@ -24,6 +24,7 @@ CDATA means the content is "SGML-free", so you can write without worries about funny characters. --> <literallayout><![CDATA[ +CREATE OR REPLACE VIEW, CREATE OR REPLACE RULE are available No-autocommit mode is available (set autocommit to off) Substantial improvements in functionality for functions returning sets Client libraries older than 6.3 no longer supported (version 0 protocol removed) |