Transform provider error codes - It is possible that different service providers return service errors using different semantics.
转换提供者错误代码——不同的服务提供者会使用不同的语义来返回服务错误。
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。
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。
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