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dbix::dbstag::constraint(3pm) [debian man page]

DBIx::DBStag::Constraint(3pm)				User Contributed Perl Documentation			     DBIx::DBStag::Constraint(3pm)

NAME

       DBIx::DBStag::Constraint - recursive structure for representing query constraints

SYNOPSIS

DESCRIPTION

       A constraint is a recursive structure for representing query constraints;

	 AND ---  x=1
	   
	    ---- OR   ---  y>2
		   
		    -----  boolfunc(z)

       A constraint is either a bool (AND, OR, NOT) with >0 children, or it can be a leaf node representing an atomic constraint

       the constraint corresponds to a SQLTemplate option block; eg

	 [ name LIKE &name& ]
	 [ name => &name& ]
	 [ start > &min_start& ]
	 [ start => &start& ]
	 [ somefunc(&x&) ]
	 [ somefunc(&x&, &y&) ]
	 [ somefunc(t.col, &x&, &y&) => &z& ]

       the constraint consists of an operator (represented by => in the option block). If no => is present, then it is a simple variable binding.

       A constraint can consist of multiple variable bindings

WEBSITE

       <http://stag.sourceforge.net>

AUTHOR

       Chris Mungall <cjm@fruitfly.org>

COPYRIGHT

       Copyright (c) 2003 Chris Mungall

       This module is free software.  You may distribute this module under the same terms as perl itself

perl v5.12.4							    2011-10-14					     DBIx::DBStag::Constraint(3pm)

Check Out this Related Man Page

HTML::FormFu::Constraint::CallbackOnce(3pm)		User Contributed Perl Documentation	       HTML::FormFu::Constraint::CallbackOnce(3pm)

NAME

       HTML::FormFu::Constraint::CallbackOnce - Code Callback Constraint

SYNOPSIS

	   $form->constraint({
	       type => 'CallbackOnce',
	       name => 'foo',
	       callback => &sfoo,
	   );

	   sub foo {
	       my ( $value, $params ) = @_;

	       # return true or false
	   }

DESCRIPTION

       Unlinke the HTML::FormFu::Constraint::Callback, this callback is only called once, regardless of how many values are submitted.

       The first argument passed to the callback is the submitted value for the associated field; this may be a single value or an arrayref of
       value.  The second argument passed to the callback is a hashref of name/value pairs for all input fields.

       This constraint doesn't honour the "not()" value.

METHODS

   callback
       Arguments: &sub_ref

SEE ALSO

       Is a sub-class of, and inherits methods from HTML::FormFu::Constraint

       HTML::FormFu

AUTHOR

       Carl Franks "cfranks@cpan.org"

LICENSE

       This library is free software, you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.14.2							    2012-01-23			       HTML::FormFu::Constraint::CallbackOnce(3pm)
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