I added the following to the top of your program to get a trackback dump: 
use Carp;
$SIG{__DIE__} = \&Carp::confess;

[download]
This indicated that DBD::AnyData is dying on the following line of code in the ad_data method: 
      my $sth = $dbh->prepare("SELECT 1 FROM $table_name") or die DBI-
+>errstr;

[download]
I then wrote the following test program to exercise SQL::Statement directly: 
use common::sense;
use SQL::Statement;
my $sql1    = "SELECT 1+0 FROM some_table";
my $sql2    = "SELECT 1 FROM some_table";
my $parser = SQL::Parser->new();

for ($sql1, $sql2) {
    warn "trying: $_";
    my $stmt = SQL::Statement->new($_,$parser);
}

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This produces: 
trying: SELECT 1+0 FROM some_table at sql.pl line 10.
trying: SELECT 1 FROM some_table at sql.pl line 10.
Bad table or column name: '1' starts with non-alphabetic character! at
+ /usr/local/share/perl/5.10.0/SQL/Parser.pm line 2894.

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So "SELECT 1+0 from some_table" parses ok, but "SELECT 1 from some_table" doesn't!

I started with SQL::Statement 1.20. The problem persisted after upgrading to 1.23.

Looks to me like a bug in SQL::Statement. Its not recognising the literal value '1' as a simple expression. My guess is that this has stopped working in the last few releases of SQL::Statement, but DBD::AnyData relies on it.

Update: I've created an rt ticket.

In reply to Re: Saving data to XML file using DBD::AnyData by snoopy
in thread Saving data to XML file using DBD::AnyData by warsting

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