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[英]How to link two classes and then output class using DB4O as Database and C# as language?
[英]db4o: How to retrieve objects from DB without having the original class in c#?
我有一些應用程序創建的db4o
文件(我沒有源文件),我需要從該文件中獲取所有數據。
在教程中看到的所有示例中,都有用於檢索對象的類,但是如果我沒有這些類怎么辦?
您可以使用LINQPad和我的驅動程序進行嘗試: http ://www.gamlor.info/wordpress/2011/03/db4o-driver-for-linqpad/
否則,您可以探索db4o反射API:
假設您沒有課程,只想看一切。 這樣的事情(不記得確切的API):
IQuery query = container.Query();
IEnumerable allObjects = query.Execute();
foreach(Object item : allObjects){
GenericObject dbObject = (GenericObject)item; // Note: If db4o finds actuall class, it will be the right class, otherwise GenericObject. You may need to do some checks and casts
dbObject.GetGenericClass().GetDeclaredFields(); // Find out fields
object fieldData = dbObject.Get(0); // Get the field at index 0. The GetDeclaredFields() tells you which field is at which index
}
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