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use strict; { package DBD::Sponge; require DBI; require Carp; our @EXPORT = qw(); # Do NOT @EXPORT anything. our $VERSION = "12.010003"; # $Id: Sponge.pm 10002 2007-09-26 21:03:25Z Tim $ # # Copyright (c) 1994-2003 Tim Bunce Ireland # # You may distribute under the terms of either the GNU General Public # License or the Artistic License, as specified in the Perl README file. our $drh = undef; # holds driver handle once initialised my $methods_already_installed; sub driver{ return $drh if $drh; DBD::Sponge::db->install_method("sponge_test_installed_method") unless $methods_already_installed++; my($class, $attr) = @_; $class .= "::dr"; ($drh) = DBI::_new_drh($class, { 'Name' => 'Sponge', 'Version' => $VERSION, 'Attribution' => "DBD::Sponge $VERSION (fake cursor driver) by Tim Bunce", }); $drh; } sub CLONE { undef $drh; } } { package DBD::Sponge::dr; # ====== DRIVER ====== our $imp_data_size = 0; # we use default (dummy) connect method } { package DBD::Sponge::db; # ====== DATABASE ====== our $imp_data_size = 0; use strict; sub prepare { my($dbh, $statement, $attribs) = @_; my $rows = delete $attribs->{'rows'} or return $dbh->set_err($DBI::stderr,"No rows attribute supplied to prepare"); my ($outer, $sth) = DBI::_new_sth($dbh, { 'Statement' => $statement, 'rows' => $rows, (map { exists $attribs->{$_} ? ($_=>$attribs->{$_}) : () } qw(execute_hook) ), }); if (my $behave_like = $attribs->{behave_like}) { $outer->{$_} = $behave_like->{$_} foreach (qw(RaiseError PrintError HandleError ShowErrorStatement)); } if ($statement =~ /^\s*insert\b/) { # very basic, just for testing execute_array() $sth->{is_insert} = 1; my $NUM_OF_PARAMS = $attribs->{NUM_OF_PARAMS} or return $dbh->set_err($DBI::stderr,"NUM_OF_PARAMS not specified for INSERT statement"); $sth->STORE('NUM_OF_PARAMS' => $attribs->{NUM_OF_PARAMS} ); } else { #assume select # we need to set NUM_OF_FIELDS my $numFields; if ($attribs->{'NUM_OF_FIELDS'}) { $numFields = $attribs->{'NUM_OF_FIELDS'}; } elsif ($attribs->{'NAME'}) { $numFields = @{$attribs->{NAME}}; } elsif ($attribs->{'TYPE'}) { $numFields = @{$attribs->{TYPE}}; } elsif (my $firstrow = $rows->[0]) { $numFields = scalar @$firstrow; } else { return $dbh->set_err($DBI::stderr, 'Cannot determine NUM_OF_FIELDS'); } $sth->STORE('NUM_OF_FIELDS' => $numFields); $sth->{NAME} = $attribs->{NAME} || [ map { "col$_" } 1..$numFields ]; $sth->{TYPE} = $attribs->{TYPE} || [ (DBI::SQL_VARCHAR()) x $numFields ]; $sth->{PRECISION} = $attribs->{PRECISION} || [ map { length($sth->{NAME}->[$_]) } 0..$numFields -1 ]; $sth->{SCALE} = $attribs->{SCALE} || [ (0) x $numFields ]; $sth->{NULLABLE} = $attribs->{NULLABLE} || [ (2) x $numFields ]; } $outer; } sub type_info_all { my ($dbh) = @_; my $ti = [ { TYPE_NAME => 0, DATA_TYPE => 1, PRECISION => 2, LITERAL_PREFIX => 3, LITERAL_SUFFIX => 4, CREATE_PARAMS => 5, NULLABLE => 6, CASE_SENSITIVE => 7, SEARCHABLE => 8, UNSIGNED_ATTRIBUTE=> 9, MONEY => 10, AUTO_INCREMENT => 11, LOCAL_TYPE_NAME => 12, MINIMUM_SCALE => 13, MAXIMUM_SCALE => 14, }, [ 'VARCHAR', DBI::SQL_VARCHAR(), undef, "'","'", undef, 0, 1, 1, 0, 0,0,undef,0,0 ], ]; return $ti; } sub FETCH { my ($dbh, $attrib) = @_; # In reality this would interrogate the database engine to # either return dynamic values that cannot be precomputed # or fetch and cache attribute values too expensive to prefetch. return 1 if $attrib eq 'AutoCommit'; # else pass up to DBI to handle return $dbh->SUPER::FETCH($attrib); } sub STORE { my ($dbh, $attrib, $value) = @_; # would normally validate and only store known attributes # else pass up to DBI to handle if ($attrib eq 'AutoCommit') { return 1 if $value; # is already set Carp::croak("Can't disable AutoCommit"); } return $dbh->SUPER::STORE($attrib, $value); } sub sponge_test_installed_method { my ($dbh, @args) = @_; return $dbh->set_err(42, "not enough parameters") unless @args >= 2; return \@args; } } { package DBD::Sponge::st; # ====== STATEMENT ====== our $imp_data_size = 0; use strict; sub execute { my $sth = shift; # hack to support ParamValues (when not using bind_param) $sth->{ParamValues} = (@_) ? { map { $_ => $_[$_-1] } 1..@_ } : undef; if (my $hook = $sth->{execute_hook}) { &$hook($sth, @_) or return; } if ($sth->{is_insert}) { my $row; $row = (@_) ? [ @_ ] : die "bind_param not supported yet" ; my $NUM_OF_PARAMS = $sth->{NUM_OF_PARAMS}; return $sth->set_err($DBI::stderr, @$row." values bound (@$row) but $NUM_OF_PARAMS expected") if @$row != $NUM_OF_PARAMS; { local $^W; $sth->trace_msg("inserting (@$row)\n"); } push @{ $sth->{rows} }, $row; } else { # mark select sth as Active $sth->STORE(Active => 1); } # else do nothing for select as data is already in $sth->{rows} return 1; } sub fetch { my ($sth) = @_; my $row = shift @{$sth->{'rows'}}; unless ($row) { $sth->STORE(Active => 0); return undef; } return $sth->_set_fbav($row); } *fetchrow_arrayref = \&fetch; sub FETCH { my ($sth, $attrib) = @_; # would normally validate and only fetch known attributes # else pass up to DBI to handle return $sth->SUPER::FETCH($attrib); } sub STORE { my ($sth, $attrib, $value) = @_; # would normally validate and only store known attributes # else pass up to DBI to handle return $sth->SUPER::STORE($attrib, $value); } } 1; __END__ =pod =head1 NAME DBD::Sponge - Create a DBI statement handle from Perl data =head1 SYNOPSIS my $sponge = DBI->connect("dbi:Sponge:","","",{ RaiseError => 1 }); my $sth = $sponge->prepare($statement, { rows => $data, NAME => $names, %attr } ); =head1 DESCRIPTION DBD::Sponge is useful for making a Perl data structure accessible through a standard DBI statement handle. This may be useful to DBD module authors who need to transform data in this way. =head1 METHODS =head2 connect() my $sponge = DBI->connect("dbi:Sponge:","","",{ RaiseError => 1 }); Here's a sample syntax for creating a database handle for the Sponge driver. No username and password are needed. =head2 prepare() my $sth = $sponge->prepare($statement, { rows => $data, NAME => $names, %attr } ); =over 4 =item * The C<$statement> here is an arbitrary statement or name you want to provide as identity of your data. If you're using DBI::Profile it will appear in the profile data. Generally it's expected that you are preparing a statement handle as if a C<select> statement happened. =item * C<$data> is a reference to the data you are providing, given as an array of arrays. =item * C<$names> is a reference an array of column names for the C<$data> you are providing. The number and order should match the number and ordering of the C<$data> columns. =item * C<%attr> is a hash of other standard DBI attributes that you might pass to a prepare statement. Currently only NAME, TYPE, and PRECISION are supported. =back =head1 BUGS Using this module to prepare INSERT-like statements is not currently documented. =head1 AUTHOR AND COPYRIGHT This module is Copyright (c) 2003 Tim Bunce Documentation initially written by Mark Stosberg The DBD::Sponge module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. In particular permission is granted to Tim Bunce for distributing this as a part of the DBI. =head1 SEE ALSO L<DBI> =cut
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