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This patch adds support for %TYPE in CREATE FUNCTION argument and return

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types.  This version has an elog() to remind the user the type
resolution is not dynamic.

Ian Lance Taylor
This commit is contained in:
Bruce Momjian
2001-06-04 23:27:23 +00:00
parent 0a93285d88
commit 28d2420eef
9 changed files with 170 additions and 13 deletions
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18
doc/src/sgml/ref/create_function.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_function.sgml,v 1.23 2001/05/19 09:01:10 petere Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_function.sgml,v 1.24 2001/06/04 23:27:23 momjian Exp $
-->
<refentry id="SQL-CREATEFUNCTION">
@ -55,10 +55,16 @@ CREATE FUNCTION <replaceable class="parameter">name</replaceable> ( [ <replaceab
<listitem>
<para>
The data type(s) of the function's arguments, if any. The
input types may be base or complex types, or
<literal>opaque</literal>. <literal>Opaque</literal> indicates
input types may be base or complex types,
<literal>opaque</literal>, or the same as the type of an
existing column. <literal>Opaque</literal> indicates
that the function accepts arguments of a non-SQL type such as
<type>char *</type>.
The type of a column is indicated using <replaceable
class="parameter">tablename</replaceable>.<replaceable
class="parameter">columnname</replaceable><literal>%TYPE</literal>;
using this can sometimes help make a function independent from
changes to the definition of a table.
</para>
</listitem>
</varlistentry>
@ -69,8 +75,10 @@ CREATE FUNCTION <replaceable class="parameter">name</replaceable> ( [ <replaceab
<listitem>
<para>
The return data type. The output type may be specified as a
base type, complex type, <literal>setof</literal> type, or
<literal>opaque</literal>. The <literal>setof</literal>
base type, complex type, <literal>setof</literal> type,
<literal>opaque</literal>, or the same as the type of an
existing column.
The <literal>setof</literal>
modifier indicates that the function will return a set of
items, rather than a single item. Functions with a declared
return type of <literal>opaque</literal> do not return a value.