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.
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。
This function handles the various communication state changes, such as when the call starts, when a connection is established, and when the response has been received.
此函数会处理各种通信状态更改(如调用启动时、建立连接时和接收到响应时)。
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