Add a node programatically into database in Drupal 7

 $node = new stdClass();
 $node->title = "title"
 $node->type = "node_type_name";
 $node->language = LANGUAGE_NONE; // Or e.g. 'en' if locale is enabled
 $node->uid = $uid;
 $node->status = 1;
 $node->promote = 0; //(1 or 0): promoted to front page
 $node->comment = 1; // 0 = comments disabled, 1 = read only, 2 = read/write
 $node->created = strtotime("now");
 $node->changed = strtotime("now");
 $node->moderate = 0;
 $node->sticky = 0;
 $node->tnid = 0;
 $node->revision = 1;
 $node->translate = 0;
  // add CCK field data
 $node->field_enrollment_id[$node->language][0]['value'] = '111';
 $node->field_enrolled_on[$node->language][0]['value'] = strtotime("now");
 $node->field_enrollment_status[$node->language][0]['value'] = 'ns';        
 $node->field_user_id[$node->language][0]['uid'] = $uid;
 $node->field_class_id[$node->language][0]['nid'] = $nid;

 $node = node_submit($node); // Prepare node for saving
 node_save($node);