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|
package SQL::Translator::Parser::Excel;
=head1 NAME
SQL::Translator::Parser::Excel - parser for Excel
=head1 SYNOPSIS
use SQL::Translator;
my $translator = SQL::Translator->new;
$translator->parser('Excel');
=head1 DESCRIPTION
Parses an Excel spreadsheet file using Spreadsheet::ParseExcel.
=head1 OPTIONS
=over
=item * scan_fields
Indicates that the columns should be scanned to determine data types
and field sizes. True by default.
=back
=cut
use strict;
use warnings;
our ($DEBUG, @EXPORT_OK);
$DEBUG = 0 unless defined $DEBUG;
our $VERSION = '1.59';
use Spreadsheet::ParseExcel;
use Exporter;
use SQL::Translator::Utils qw(debug normalize_name);
use base qw(Exporter);
@EXPORT_OK = qw(parse);
my %ET_to_ST = (
'Text' => 'VARCHAR',
'Date' => 'DATETIME',
'Numeric' => 'DOUBLE',
);
# -------------------------------------------------------------------
# parse($tr, $data)
#
# Note that $data, in the case of this parser, is unuseful.
# Spreadsheet::ParseExcel works on files, not data streams.
# -------------------------------------------------------------------
sub parse {
my ($tr, $data) = @_;
my $args = $tr->parser_args;
my $filename = $tr->filename || return;
my $wb = Spreadsheet::ParseExcel::Workbook->Parse( $filename );
my $schema = $tr->schema;
my $table_no = 0;
my $wb_count = $wb->{'SheetCount'} || 0;
for my $num ( 0 .. $wb_count - 1 ) {
$table_no++;
my $ws = $wb->Worksheet( $num );
my $table_name = normalize_name( $ws->{'Name'} || "Table$table_no" );
my @cols = $ws->ColRange;
next unless $cols[1] > 0;
my $table = $schema->add_table( name => $table_name );
my @field_names = ();
for my $col ( $cols[0] .. $cols[1] ) {
my $cell = $ws->Cell(0, $col);
my $col_name = normalize_name( $cell->{'Val'} );
my $data_type = ET_to_ST( $cell->{'Type'} );
push @field_names, $col_name;
my $field = $table->add_field(
name => $col_name,
data_type => $data_type,
default_value => '',
size => 255,
is_nullable => 1,
is_auto_increment => undef,
) or die $table->error;
if ( $col == 0 ) {
$table->primary_key( $field->name );
$field->is_primary_key(1);
}
}
#
# If directed, look at every field's values to guess size and type.
#
unless (
defined $args->{'scan_fields'} &&
$args->{'scan_fields'} == 0
) {
my %field_info = map { $_, {} } @field_names;
for(
my $iR = $ws->{'MinRow'} == 0 ? 1 : $ws->{'MinRow'};
defined $ws->{'MaxRow'} && $iR <= $ws->{'MaxRow'};
$iR++
) {
for (
my $iC = $ws->{'MinCol'};
defined $ws->{'MaxCol'} && $iC <= $ws->{'MaxCol'};
$iC++
) {
my $field = $field_names[ $iC ];
my $data = $ws->{'Cells'}[ $iR ][ $iC ]->{'_Value'};
next if !defined $data || $data eq '';
my $size = [ length $data ];
my $type;
if ( $data =~ /^-?\d+$/ ) {
$type = 'integer';
}
elsif (
$data =~ /^-?[,\d]+\.[\d+]?$/
||
$data =~ /^-?[,\d]+?\.\d+$/
||
$data =~ /^-?\.\d+$/
) {
$type = 'float';
my ( $w, $d ) =
map { s/,//g; length $_ || 1 }
split( /\./, $data )
;
$size = [ $w + $d, $d ];
}
else {
$type = 'char';
}
for my $i ( 0, 1 ) {
next unless defined $size->[ $i ];
my $fsize = $field_info{ $field }{'size'}[ $i ] || 0;
if ( $size->[ $i ] > $fsize ) {
$field_info{ $field }{'size'}[ $i ] = $size->[ $i ];
}
}
$field_info{ $field }{ $type }++;
}
}
for my $field ( keys %field_info ) {
my $size = $field_info{ $field }{'size'} || [ 1 ];
my $data_type =
$field_info{ $field }{'char'} ? 'char' :
$field_info{ $field }{'float'} ? 'float' :
$field_info{ $field }{'integer'} ? 'integer' : 'char';
if ( $data_type eq 'char' && scalar @$size == 2 ) {
$size = [ $size->[0] + $size->[1] ];
}
my $field = $table->get_field( $field );
$field->size( $size ) if $size;
$field->data_type( $data_type );
}
}
}
return 1;
}
sub ET_to_ST {
my $et = shift;
$ET_to_ST{$et} || $ET_to_ST{'Text'};
}
1;
# -------------------------------------------------------------------
# Education is an admirable thing,
# but it is as well to remember that
# nothing that is worth knowing can be taught.
# Oscar Wilde
# -------------------------------------------------------------------
=pod
=head1 AUTHORS
Mike Mellilo <mmelillo@users.sourceforge.net>,
darren chamberlain E<lt>dlc@users.sourceforge.netE<gt>,
Ken Y. Clark E<lt>kclark@cpan.orgE<gt>.
=head1 SEE ALSO
Spreadsheet::ParseExcel, SQL::Translator.
=cut
|
