MySQL C ++连接器：如何获取线程/连接ID？

Question

I'm trying to find out how to obtain the MySQL Connection/thread id using Connector C++.

mysql_thread_id (MYSQL* ) seems to be available for just this, but I'm not sure how to get an instance of MYSQL from the Connector C++.

What I've tried:

  int threadId = mysql_thread_id(NULL);

But this just returns zero.

Any ideas?

Answer 1

The function mysql_thread_id() expects a pointer to a connection object created by the native MySQL C API's mysql_connect(...) function. Connector/C++ has buried that object very deep (I looked). The alternative suggested by MySQL's documentation here is to execute query SELECT CONNECTION_ID() and the returned result will be the ID you're looking for.