通过函数描述符表示导出的函数，由加载器对这些描述符进行修改，以使得 AMR 能够将服务更改为前端 导出服务。

Exported functions are represented by function descriptors that are modified by the loader to enable the AMR changing service to front-end exported services.

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这些函数以环境句柄、连接句柄、语句句柄或描述符句柄作为输入参数，返回与上一次使用该句柄作出的函数调用相关的诊断信息。

These functions take environment, connection, statement, or descriptor handles as input and return the diagnostic information related to the last function call made using that handle.

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之后，使用特殊函数property将这些方法转换为一种描述符。

After that, you use the special function property to turn those methods into a descriptor.

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