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