Returns the error number from the last CUBRID function.
The cubrid_errno function is used to get the error code of the error that occurred during the API execution. Usually, it gets the error code when API returns false as its return value.
The CUBRID connection identifier. If the connection identifier is not specified, the last connection opened by cubrid_connect is assumed.
Returns the error number from the last CUBRID function, or 0 (zero) if no error occurred.