DBD::Mem(3pm) User Contributed Perl Documentation DBD::Mem(3pm)NAMEDBD::Mem - a DBI driver for Mem & MLMem files
SYNOPSIS
use DBI;
$dbh = DBI->connect('dbi:Mem:', undef, undef, {});
$dbh = DBI->connect('dbi:Mem:', undef, undef, {RaiseError => 1});
# or
$dbh = DBI->connect('dbi:Mem:');
$dbh = DBI->connect('DBI:Mem(RaiseError=1):');
and other variations on connect() as shown in the DBI docs and
<DBI::DBD::SqlEngine metadata|DBI::DBD::SqlEngine/Metadata>.
Use standard DBI prepare, execute, fetch, placeholders, etc., see
"QUICK START" for an example.
DESCRIPTIONDBD::Mem is a database management system that works right out of the
box. If you have a standard installation of Perl and DBI you can begin
creating, accessing, and modifying simple database tables without any
further modules. You can add other modules (e.g., SQL::Statement) for
improved functionality.
DBD::Mem doesn't store any data persistently - all data has the
lifetime of the instantiated $dbh. The main reason to use DBD::Mem is
to use extended features of SQL::Statement where temporary tables are
required. One can use DBD::Mem to simulate "VIEWS" or sub-queries.
Bundling "DBD::Mem" with DBI will allow us further compatibility checks
of DBI::DBD::SqlEngine beyond the capabilities of DBD::File and
DBD::DBM. This will ensure DBI provided basis for drivers like
DBD::AnyData2 or DBD::Amazon are better prepared and tested for not-
file based backends.
Metadata
There're no new meta data introduced by "DBD::Mem". See "Metadata" in
DBI::DBD::SqlEngine for full description.
GETTING HELP, MAKING SUGGESTIONS, AND REPORTING BUGS
If you need help installing or using DBD::Mem, please write to the DBI
users mailing list at <mailto:dbi-users@perl.org> or to the
comp.lang.perl.modules newsgroup on usenet. I cannot always answer
every question quickly but there are many on the mailing list or in the
newsgroup who can.
DBD developers for DBD's which rely on DBI::DBD::SqlEngine or DBD::Mem
or use one of them as an example are suggested to join the DBI
developers mailing list at <mailto:dbi-dev@perl.org> and strongly
encouraged to join our IRC channel at <irc://irc.perl.org/dbi>.
If you have suggestions, ideas for improvements, or bugs to report,
please report a bug as described in DBI. Do not mail any of the authors
directly, you might not get an answer.
When reporting bugs, please send the output of
"$dbh->mem_versions($table)" for a table that exhibits the bug and as
small a sample as you can make of the code that produces the bug. And
of course, patches are welcome, too :-).
If you need enhancements quickly, you can get commercial support as
described at <http://dbi.perl.org/support/> or you can contact Jens
Rehsack at rehsack@cpan.org for commercial support.
AUTHOR AND COPYRIGHT
This module is written by Jens Rehsack < rehsack AT cpan.org >.
Copyright (c) 2016- by Jens Rehsack, all rights reserved.
You may freely distribute and/or modify this module under the terms of
either the GNU General Public License (GPL) or the Artistic License, as
specified in the Perl README file.
SEE ALSO
DBI for the Database interface of the Perl Programming Language.
SQL::Statement and DBI::SQL::Nano for the available SQL engines.
SQL::Statement::RAM where the implementation is shamelessly stolen from
to allow DBI bundled Pure-Perl drivers increase the test coverage.
DBD::SQLite using "dbname=:memory:" for an incredible fast in-memory
database engine.
perl v5.26.1 2017-12-31 DBD::Mem(3pm)
