NHibernate：级联删除时的c＃动作

Question

我实现了级联删除的一对多代码映射。我有与子实体关联的文件。我想在子级联删除时自动删除文件。 如何实施？

Answer 1

我发现NHibernate支持配置级别的监听器。它并不完美，但总比没有好。简化示例：

private Hashtable<Object,Object> htObjClass;
private String evalReflectionFunction(String varMethodName, String varClassName,Table objTable)
{
    String strReturnValue = "";
    try
    {
        LinkedHashMap<String, String> hashtable = new LinkedHashMap<String, String>();
        .
        .
        // NOTE : below given jar path is same for all threads
        File seleniumJarFile = new File(jarpath);
        URLClassLoader myClassLoader =  new URLClassLoader(new URL[]{seleniumJarFile.toURI().toURL()},Thread.currentThread().getContextClassLoader());
        if(!this.htObjClass.containsKey(varClassName))
        {
            Class<?> dynamicClass = (Class<?>) myClassLoader.loadClass("packageName."+varClassName);
            Constructor<?> cons = dynamicClass.getConstructor(RunEnvironment.class);
            htObjClass.put(varClassName,cons.newInstance(this.objRunEnvClass));
        }
        Object obj2 = this.htObjClass.get(varClassName);
        Method method = obj2.getClass().getDeclaredMethod(varMethodName, LinkedHashMap.class);
        if(method != null)
            Object retVal = method.invoke(obj2, hashtable);
        else
            strReturnValue = "Error-text";
    }
    catch(Exception ex)
    {
        ......
    }
    return strReturnValue;
}