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Add a bunch of pseudo-types to replace the behavior formerly associated

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with OPAQUE, as per recent pghackers discussion.  I still want to do some
more work on the 'cstring' pseudo-type, but I'm going to commit the bulk
of the changes now before the tree starts shifting under me ...
This commit is contained in:
Tom Lane
2002-08-22 00:01:51 +00:00
parent 606c9b9d4f
commit b663f3443b
126 changed files with 2005 additions and 1205 deletions
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25
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 1.41 2002/07/24 19:11:07 petere Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_function.sgml,v 1.42 2002/08/22 00:01:40 tgl Exp $
-->
<refentry id="SQL-CREATEFUNCTION">
@ -67,16 +67,17 @@ CREATE [ OR REPLACE ] FUNCTION <replaceable class="parameter">name</replaceable>
<listitem>
<para>
The data type(s) of the function's arguments, if any. The
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
input types may be base, complex, or domain types,
or the same as the type of an existing column.
The type of a column is referenced by writing <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.
Depending on the implementation language it may also be allowed
to specify <quote>pseudo-types</> such as <type>cstring</>.
Pseudo-types indicate that the actual argument type is either
incompletely specified, or outside the set of ordinary SQL datatypes.
</para>
</listitem>
</varlistentry>
@ -87,15 +88,13 @@ CREATE [ OR REPLACE ] FUNCTION <replaceable class="parameter">name</replaceable>
<listitem>
<para>
The return data type. The return type may be specified as a
base type, complex type, <literal>setof</literal> type,
<literal>opaque</literal>, or the same as the type of an
base, complex, or domain type, or the same as the type of an
existing column.
Depending on the implementation language it may also be allowed
to specify <quote>pseudo-types</> such as <type>cstring</>.
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.
These cannot be called directly; trigger functions make use of
this feature.
items, rather than a single item.
</para>
</listitem>
</varlistentry>