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.\" ========================================================================
.\"
.IX Title "DBD::Mem 3"
.TH DBD::Mem 3 "2017-12-28" "perl v5.26.3" "User Contributed Perl Documentation"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.SH "NAME"
DBD::Mem \- a DBI driver for Mem & MLMem files
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\& use DBI;
\& $dbh = DBI\->connect(\*(Aqdbi:Mem:\*(Aq, undef, undef, {});
\& $dbh = DBI\->connect(\*(Aqdbi:Mem:\*(Aq, undef, undef, {RaiseError => 1});
\&
\& # or
\& $dbh = DBI\->connect(\*(Aqdbi:Mem:\*(Aq);
\& $dbh = DBI\->connect(\*(AqDBI:Mem(RaiseError=1):\*(Aq);
.Ve
.PP
and other variations on \fBconnect()\fR as shown in the \s-1DBI\s0 docs and
<DBI::DBD::SqlEngine metadata|DBI::DBD::SqlEngine/Metadata>.
.PP
Use standard \s-1DBI\s0 prepare, execute, fetch, placeholders, etc.,
see \*(L"\s-1QUICK START\*(R"\s0 for an example.
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
DBD::Mem is a database management system that works right out of the box.
If you have a standard installation of Perl and \s-1DBI\s0 you can begin creating,
accessing, and modifying simple database tables without any further modules.
You can add other modules (e.g., SQL::Statement) for improved functionality.
.PP
DBD::Mem doesn't store any data persistently \- all data has the lifetime of
the instantiated \f(CW$dbh\fR. 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 \f(CW\*(C`VIEWS\*(C'\fR or sub-queries.
.PP
Bundling \f(CW\*(C`DBD::Mem\*(C'\fR with \s-1DBI\s0 will allow us further compatibility checks
of DBI::DBD::SqlEngine beyond the capabilities of DBD::File and
\&\s-1DBD::DBM\s0. This will ensure \s-1DBI\s0 provided basis for drivers like
DBD::AnyData2 or DBD::Amazon are better prepared and tested for
not-file based backends.
.SS "Metadata"
.IX Subsection "Metadata"
There're no new meta data introduced by \f(CW\*(C`DBD::Mem\*(C'\fR. See
\&\*(L"Metadata\*(R" in DBI::DBD::SqlEngine for full description.
.SH "GETTING HELP, MAKING SUGGESTIONS, AND REPORTING BUGS"
.IX Header "GETTING HELP, MAKING SUGGESTIONS, AND REPORTING BUGS"
If you need help installing or using DBD::Mem, please write to the \s-1DBI\s0
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.
.PP
\&\s-1DBD\s0 developers for \s-1DBD\s0's which rely on DBI::DBD::SqlEngine or DBD::Mem or
use one of them as an example are suggested to join the \s-1DBI\s0 developers
mailing list at <mailto:dbi\-dev@perl.org> and strongly encouraged to join our
\&\s-1IRC\s0 channel at <irc://irc.perl.org/dbi>.
.PP
If you have suggestions, ideas for improvements, or bugs to report, please
report a bug as described in \s-1DBI.\s0 Do not mail any of the authors directly,
you might not get an answer.
.PP
When reporting bugs, please send the output of \f(CW\*(C`$dbh\->mem_versions($table)\*(C'\fR
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
:\-).
.PP
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.
.SH "AUTHOR AND COPYRIGHT"
.IX Header "AUTHOR AND COPYRIGHT"
This module is written by Jens Rehsack < rehsack \s-1AT\s0 cpan.org >.
.PP
.Vb 1
\& Copyright (c) 2016\- by Jens Rehsack, all rights reserved.
.Ve
.PP
You may freely distribute and/or modify this module under the terms of
either the \s-1GNU\s0 General Public License (\s-1GPL\s0) or the Artistic License, as
specified in the Perl \s-1README\s0 file.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\s-1DBI\s0 for the Database interface of the Perl Programming Language.
.PP
SQL::Statement and DBI::SQL::Nano for the available \s-1SQL\s0 engines.
.PP
SQL::Statement::RAM where the implementation is shamelessly stolen from
to allow \s-1DBI\s0 bundled Pure-Perl drivers increase the test coverage.
.PP
DBD::SQLite using \f(CW\*(C`dbname=:memory:\*(C'\fR for an incredible fast in-memory database engine.