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Support enum data types. Along the way, use macros for the values of

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pg_type.typtype whereever practical.  Tom Dunstan, with some kibitzing
from Tom Lane.
This commit is contained in:
Tom Lane
2007-04-02 03:49:42 +00:00
parent a482a3e58b
commit 57690c6803
74 changed files with 2398 additions and 332 deletions
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12
doc/src/sgml/plpgsql.sgml
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@@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.105 2007/02/01 00:28:17 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.106 2007/04/02 03:49:37 tgl Exp $ -->
<chapter id="plpgsql">
<title><application>PL/pgSQL</application> - <acronym>SQL</acronym> Procedural Language</title>
@@ -210,7 +210,8 @@ $$ LANGUAGE plpgsql;
<para>
<application>PL/pgSQL</> functions can also be declared to accept
and return the polymorphic types
<type>anyelement</type> and <type>anyarray</type>. The actual
<type>anyelement</type>, <type>anyarray</type>, and <type>anyenum</>.
The actual
data types handled by a polymorphic function can vary from call to
call, as discussed in <xref linkend="extend-types-polymorphic">.
An example is shown in <xref linkend="plpgsql-declaration-aliases">.
@@ -698,8 +699,9 @@ $$ LANGUAGE plpgsql;
<para>
When the return type of a <application>PL/pgSQL</application>
function is declared as a polymorphic type (<type>anyelement</type>
or <type>anyarray</type>), a special parameter <literal>$0</literal>
function is declared as a polymorphic type (<type>anyelement</type>,
<type>anyarray</type>, or <type>anyenum</>),
a special parameter <literal>$0</literal>
is created. Its data type is the actual return type of the function,
as deduced from the actual input types (see <xref
linkend="extend-types-polymorphic">).
@@ -726,7 +728,7 @@ $$ LANGUAGE plpgsql;
<para>
The same effect can be had by declaring one or more output parameters as
<type>anyelement</type> or <type>anyarray</type>. In this case the
polymorphic types. In this case the
special <literal>$0</literal> parameter is not used; the output
parameters themselves serve the same purpose. For example: