Imported from /srv/lorry/lorry-area/perl-dbi-tarball/DBI-1.622.tar.gz.HEADDBI-1.622master

1 files changed, 305 insertions, 0 deletions

diff --git a/lib/DBD/Sponge.pm b/lib/DBD/Sponge.pm
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+{
+    package DBD::Sponge;
+
+    require DBI;
+    require Carp;
+
+    our @EXPORT = qw(); # Do NOT @EXPORT anything.
+    our $VERSION = sprintf("12.%06d", q$Revision: 10002 $ =~ /(\d+)/o);
+
+
+#   $Id: Sponge.pm 10002 2007-09-26 21:03:25Z timbo $
+#
+#   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.
+
+    $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 ======
+    $imp_data_size = 0;
+    # we use default (dummy) connect method
+}
+
+
+{   package DBD::Sponge::db; # ====== DATABASE ======
+    $imp_data_size = 0;
+    use strict;
+
+    sub prepare {
+	my($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 ======
+    $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