如何在SQL：：Abstract/DBIx：：sqlt_datatype设置类？

use SQL::Abstract;
use DBIx::Class;

my $sql = SQL::Abstract->new;
my $schema = DBIx::Class->connect('dbi:SQLite:dbname=test.db');

my ($stmt, @bind) = $sql->select('table', ['column1', 'column2'], \%where);

my $rs = $schema->resultset('table')->search_rs($stmt, @bind);

while (my $row = $rs->next) {
    # 处理查询结果
}

package MyApp::Schema::Result::Table;
use base 'DBIx::Class::Core';

__PACKAGE__->table('table');
__PACKAGE__->add_columns(
    'column1' => {
        data_type   => 'integer',
        is_nullable => 0,
    },
    'column2' => {
        data_type   => 'varchar',
        size        => 255,
        is_nullable => 1,
    },
);

1;