如何从FluentNHibernate生成hbm.xml文件

using FluentNHibernate.Cfg;
using FluentNHibernate.Cfg.Db;
using FluentNHibernate.Mapping;
using NHibernate;
using NHibernate.Cfg;

// 定义实体类
public class Product
{
    public virtual int Id { get; set; }
    public virtual string Name { get; set; }
    public virtual decimal Price { get; set; }
}

// 配置映射
public class ProductMap : ClassMap<Product>
{
    public ProductMap()
    {
        Table("Products");
        Id(x => x.Id);
        Map(x => x.Name);
        Map(x => x.Price);
    }
}

// 创建映射器
public class NHibernateHelper
{
    public static ISessionFactory CreateSessionFactory()
    {
        return Fluently.Configure()
            .Database(MsSqlConfiguration.MsSql2012.ConnectionString("your_connection_string"))
            .Mappings(m => m.FluentMappings.AddFromAssemblyOf<ProductMap>())
            .BuildSessionFactory();
    }
}

// 导出hbm.xml文件
public class HbmXmlExporter
{
    public static void ExportMappings(Configuration config, string outputPath)
    {
        var exporter = new NHibernate.Tool.hbm2ddl.SchemaExport(config);
        exporter.SetOutputFile(outputPath);
        exporter.Create(true, false);
    }
}

// 使用示例
public class Program
{
    public static void Main(string[] args)
    {
        var sessionFactory = NHibernateHelper.CreateSessionFactory();
        var configuration = sessionFactory.GetClassMetadata(typeof(Product)).MappedClass;
        var outputPath = "path_to_output_hbm.xml";

        HbmXmlExporter.ExportMappings(configuration, outputPath);
    }
}