有两种描述符类型：一种通过 SQL ALLOCATE DESCRIPTOR 创建，另一种基于 SQLDA 结构定义。
There are two types of descriptors, one created via the SQL ALLOCATE DESCRIPTOR and the other is defined based on the SQLDA structure.
签名格式扩展了字段和方法描述符的概念，将泛型类型信息包含于其中。
The signature format extends the idea of field and method descriptors to include generic type information.
字段描述符指定类中定义的一个类的准确类型。
A field descriptor specifies the exact type of a field defined within a class.
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