This factory is specific to a Service Registry that accepts an identity object (Service Query) and returns an appropriate DbCommand, which is able to return Service result set.
这个工厂针对一个服务注册中心，它接收一个identity对象(服务查询Service Query)并返回一个对应的DbCommand，该DbCommand返回服务结果集。
The identity object encapsulates information about the user or entity being validated.
标识对象封装有关正在验证的用户或实体的信息。
The identity object encapsulates information about the user or entity being validated.
标识对象封装有关正在验证的用户或实体的信息。
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