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SQL Functions - PostgreSQL

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Old 09-04-2010
SQL Functions - PostgreSQL
Hi guys.

I have some questions about SQL functions in postgresql:

1. Can a SQL function call another SQL function?
2. How about recursive calls?
3. Consider we have function that has a varchar argument.

CREATE FUNCTION func(varchar) RETURN void AS $$
some SQL queries.
$$ LANGUAGE SQL;

Should we define the argument, varchar or we should define the length too like varchar(20)? How about return values?
4. consider this example:
we have table named student and a function like this: it only gets a student row and add that row to the student table.

CREATE FUNCTION add_new(student) RETURNS void AS $$
INSERT INTO student VALUES ($1);
$$ LANGUAGE SQL;

is this function syntactically right?

Thank you very much.
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LEARN ABOUT DEBIAN

sql::translator::producer::sqlserver

SQL::Translator::Producer::SQLServer(3pm)		User Contributed Perl Documentation		 SQL::Translator::Producer::SQLServer(3pm)

NAME

       SQL::Translator::Producer::SQLServer - MS SQLServer producer for SQL::Translator

SYNOPSIS

	 use SQL::Translator;

	 my $t = SQL::Translator->new( parser => '...', producer => 'SQLServer' );
	 $t->translate;

DESCRIPTION

       This is currently a thin wrapper around the nextgen SQL::Translator::Generator::DDL::SQLServer DDL maker.

Extra Attributes
       field.list
	   List of values for an enum field.

TODO

	* !! Write some tests !!
	* Reserved words list needs updating to SQLServer.
	* Triggers, Procedures and Views DO NOT WORK

	   # Text of view is already a 'create view' statement so no need to
	   # be fancy
	   foreach ( $schema->get_views ) {
	       my $name = $_->name();
	       $output .= "

";
	       $output .= "--
-- View: $name
--

" unless $no_comments;
	       my $text = $_->sql();
	       $text =~ s/
//g;
	       $output .= "$text
GO
";
	   }

	   # Text of procedure already has the 'create procedure' stuff
	   # so there is no need to do anything fancy. However, we should
	   # think about doing fancy stuff with granting permissions and
	   # so on.
	   foreach ( $schema->get_procedures ) {
	       my $name = $_->name();
	       $output .= "

";
	       $output .= "--
-- Procedure: $name
--

" unless $no_comments;
	       my $text = $_->sql();
	     $text =~ s/
//g;
	       $output .= "$text
GO
";
	   }

SEE ALSO

       SQL::Translator

AUTHORS

       See the included AUTHORS file: http://search.cpan.org/dist/SQL-Translator/AUTHORS <http://search.cpan.org/dist/SQL-Translator/AUTHORS>

COPYRIGHT

       Copyright (c) 2012 the SQL::Translator "AUTHORS" as listed above.

LICENSE

       This code is free software and may be distributed under the same terms as Perl itself.

perl v5.14.2							    2012-05-10				 SQL::Translator::Producer::SQLServer(3pm)