How to get moodle course completion status

I want to get course completion states in a moodle i enable the completion for site and for course and activities and set conditions to it.i can get activities completion form `mdl_course_modules_completion` DB table now i want get course completion i look in `mdl_course_completions` and `mdl_course_completion_criteria` tables but no records found.,is there any moodle inbuilt function for this i tried follwing code also but did find a good result require_once("{$CFG->libdir}/completionlib.php"); $cinfo = new completion_info(51); $iscomplete = $cinfo->is_course_complete($USER->id); var_dump($iscomplete);