phpman > perldoc > DBD::Mem

NAME
    DBD::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.

DESCRIPTION
    DBD::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 AT 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 AT 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 AT 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.