driver/sqltrace/sqltrace.go
func SetOn(on bool) {
	tracer.mu.Lock()
	tracer.on = on
	tracer.mu.Unlock()
}
func SetOn(on bool) {
	tracer.mu.Lock()
	tracer.on = on
	tracer.mu.Unlock()
}
// SetOn sets tracing methods output active or inactive.