package SAS::TRX::SQLite;
#
# Format TRX-learned structure and data into MySQL dialect
#
use strict;
use warnings;
use base qw(SAS::TRX);
use IO::File;
#
# Constructor
#
sub new
{
my $class = shift;
my %param = @_;
my $self = $class->SUPER::new(@_);
# Open destination files
foreach my $dst (qw(DATASET STRUCT)) {
if ($param{$dst}) {
$self->{$dst} = new IO::File $param{$dst}, 'w';
}
}
bless ($self,$class);
return $self;
}
#
# Create an INSERT line for a given dataset and list of data values
#
# Numeric data length and type is unreliable in TRX library,
# everything is assumed FLOAT.
#
# Gather some statistics for CREATE TABLE:
# - maximum value to compute desired column length
# - detect if the values are really floating point
#
sub data_row
{
my $self = shift;
my $dsname = shift;
my $row = shift;
for (my $i=0; $i<= $#{$row}; $i++) {
if (defined $$row[$i]) {
if ($self->{TRX}{$dsname}{CTYPES}[$i] == 2) { # Character data
$$row[$i] =~ s/'+/''/g; # Escape quotes. '
$$row[$i] = '\''.$$row[$i].'\'';
} else { # Numeric data
unless (defined ($self->{TRX}{$dsname}{VAR}[$i]{MAX}) &&
$self->{TRX}{$dsname}{VAR}[$i]{MAX}>= abs($$row[$i])) {
$self->{TRX}{$dsname}{VAR}[$i]{MAX} = abs($$row[$i])
}
$self->{TRX}{$dsname}{VAR}[$i]{FLOAT} = 1
if (index($$row[$i],'.') >= 0);
}
} else {
$$row[$i] = 'NULL';
}
}
print { $self->{DATASET} } "INSERT INTO $dsname (",
join(',', @{$self->{TRX}{$dsname}{CNAMES}}),
') VALUES ('. join(',', @{ $row }),"),\n";
}
#
# Make CREATE TABLE constructs
#
sub data_description
{
my $self = shift;
my @dd;
foreach my $tbl (keys %{$self->{TRX}}) {
print { $self->{STRUCT} } "CREATE TABLE $tbl (\n\t";
@dd = ();
foreach my $var (@{ $self->{TRX}{$tbl}{VAR} }) {
push @dd, $var->{NNAME} . length($var->{NNAME}) < 8 ? "\t\t" : "\t".
( $var->{NTYPE} == 2 ? 'CHAR(' . $var->{NLNG} .')' :
$var->{FLOAT} ? 'REAL' :
'INTEGER('.length($var->{MAX}).')'
)
}
print { $self->{STRUCT} } join(",\n\t", @dd), "\n);\n";
}
}
1;
__END__
=head1 NAME
SAS::TRX::SQLite - Format TRX-learned structure and data into SQLITE dialect.
=head1 SYNOPSIS
use SAS::TRX::SQLite;
my $trx = new SAS::TRX::SQLite DATASET=>'trx_insert.sql', STRUCT=>'trx_dd.sql';
$trx->load('source.trx');
=head1 DESCRIPTION
Parses 'source.trx' and splits onto DATASET and STRUCT files. Make sure you have
write access permission to the destination files. INSERT is in packed format like
INSERT INTO DATA_TABLE (COLUMN1, COLUMN2, ...) VALUES(VALUE1, VALUE2, ...);
INSERT INTO DATA_TABLE (COLUMN1, COLUMN2, ...) VALUES(VALUE1, VALUE2, ...);
...
INSERT INTO DATA_TABLE (COLUMN1, COLUMN2, ...) VALUES(VALUE1, VALUE2, ...);
=head1 SEE ALSO
SAS::TRX for the base class
=head1 AUTHOR
Alexander Kuznetsov, <acca (at) cpan.org>
=head1 COPYRIGHT AND LICENSE
Copyright (C) 2009 by Alexander Kuznetsov
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself, either Perl version 5.10.0 or,
at your option, any later version of Perl 5 you may have available.
=cut