NAME

Genezzo::Row::RSExpr - Row Source Expression Evaluation

SYNOPSIS

use Genezzo::Row::RSExpr;

# see Genezzo::GenDBI usage

DESCRIPTION

RSExpr is a hierarchical pushhash (see Genezzo::PushHash::hph) class which evaluates and projects a set of expressions for each input row. The input rows are produced by RSTab (see Genezzo::Row::RSTab).

ARGUMENTS

row source (Required) - an input row source

dict (Required) - dictionary object from Genezzo::Dict

dbh (Required) - database handle object from Genezzo::GenDBI

select list (Optional) - a list of output expressions that is applied as a transform on the input row

FUNCTIONS

RSExpr support all standard hph hierarchical pushhash operations.

EXPORT

LIMITATIONS

various

TODO

SQLPrepare/SQLFetch: requires ALIAS argument, which doesn't make sense for rowsources like RSDual (see XEval). "Alias" is only necessary to disambiguate named columns.

AUTHOR

Jeffrey I. Cohen, jcohen@genezzo.com

SEE ALSO

perl(1).

Copyright (c) 2005, 2006 Jeffrey I Cohen. All rights reserved.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

Address bug reports and comments to: jcohen@genezzo.com

For more information, please visit the Genezzo homepage at http://www.genezzo.com