java - retrieve more than one field from SQLite database and compare with these field -

i want compare user name , password database if exists success if not throws error use sqliteopenhelper don task can 1 field database how can retrieve multiple fields

 public userinfo get_user_by_id(string id) {         sqlitedatabase db = this.getreadabledatabase();         userinfo userinfo = null;          cursor cursor = db.query(table_name, new string[]{column_app_id}, column_app_id + "=?", new string[]{id + ""}, null, null, null);             while (cursor.movetonext()) {                //userinfo.setappid(cursor.getstring(cursor.getcolumnindex(column_app_id)));                userinfo = new userinfo(cursor.getstring(cursor.getcolumnindex(column_app_id)));            } 

please me in advance

return list of userinfo method get_user_by_id().

public arraylist<userinfo> get_user_by_id(string id) {     arraylist<userinfo> listuserinfo = new arraylist<userinfo>();     sqlitedatabase db = this.getreadabledatabase();     cursor cursor = db.query(table_name, new string[]{column_app_id}, column_app_id + "=?", new string[]{id + ""}, null, null, null);      if (cursor != null) {          while (cursor.movetonext()) {           userinfo userinfo = new userinfo();           userinfo.setappid(cursor.getstring(cursor.getcolumnindex(column_app_id)));           // here can multiple record , add list            listuserinfo.add(userinfo);         }     }  return listuserinfo; }