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On Wed, 2002-05-29 at 01:41, Tom Lane wrote:

Browse Source 
>
> > Is it a good idea to provide an example (such as the above), or should I
> > just try and describe the behaviour?
>
> Examples are generally good things ...

OK, the attached documentation patch provides some simple examples of
use of tablename as a parameter, %ROWTYPE and %TYPE.

In the end I decided that the documentation is literally correct, but
hard to follow without any examples explicitly showing the use of a
table name as a parameter.

Andrew McMillan
This commit is contained in:
Bruce Momjian 2002-06-15 19:34:51 +00:00
parent 240de617fb
commit eeb1dd5068
1 changed files with 24 additions and 1 deletions
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25
doc/src/sgml/plsql.sgml
View File

@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/Attic/plsql.sgml,v 2.58 2002/05/03 04:11:07 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/Attic/plsql.sgml,v 2.59 2002/06/15 19:34:51 momjian Exp $
-->
<chapter id="plpgsql">
@ -371,6 +371,9 @@ END;
user_id INTEGER;
quantity NUMERIC(5);
url VARCHAR;
myrow tablename%ROWTYPE;
myfield tablename.fieldname%TYPE;
arow RECORD;
</programlisting>
</para>
@ -448,6 +451,15 @@ BEGIN
-- Some computations here
END;
' LANGUAGE 'plpgsql';
CREATE FUNCTION use_many_fields(tablename) RETURNS TEXT AS '
DECLARE
in_t ALIAS FOR $1;
BEGIN
RETURN in_t.f1 || in_t.f3 || in_t.f5 || in_t.f7;
END;
' LANGUAGE 'plpgsql';
</programlisting>
</para>
</sect2>
@ -491,6 +503,17 @@ END;
row could be from a view). The fields of the row type inherit the
table's field size or precision for data types such as
<type>char(n)</type>.
<programlisting>
CREATE FUNCTION use_two_tables(tablename) RETURNS TEXT AS '
DECLARE
in_t ALIAS FOR $1;
use_t table2name%ROWTYPE;
BEGIN
SELECT * INTO use_t FROM table2name WHERE ... ;
RETURN in_t.f1 || use_t.f3 || in_t.f5 || use_t.f7;
END;
' LANGUAGE 'plpgsql';
</programlisting>
</para>
</sect2>