sqlite query not working android -

these methods of spinners

 mspinnermodel.setonitemselectedlistener(new adapterview.onitemselectedlistener() {                 @override                 public void onitemselected(adapterview<?> parent, view view, int position, long id) {                     selectedmodel = parent.getitematposition(position).tostring();                       toast.maketext(parent.getcontext(), "selected model: " + selectedmodel, toast.length_long).show();                      string sp1 = string.valueof(mspinnermodel.getselecteditem());                     if (sp1.contentequals("college1")) {                         list<string> list = new arraylist<string>();                         list.add("maharani university ");                         //list.add("manipal ");                       //  list.add("itm university ");                        // list.add("university1");                         // list.add("maharani universty");                           arrayadapter<string> dataadapter = new arrayadapter<string>(mainactivity.this, android.r.layout.simple_spinner_item, list);                         dataadapter.setdropdownviewresource(android.r.layout.simple_spinner_dropdown_item);                         dataadapter.notifydatasetchanged();                           // selectedmake = parent.getitematposition(position).tostring();                          mspinnermake.setadapter(dataadapter);                     }                      if (sp1.contentequals("college2")) {                         list<string> list1 = new arraylist<string>();                         list1.add("itm university");                         //list1.add("university2");                        // list1.add("university3");                        //  selectedmake = parent.getitematposition(position).tostring();                           arrayadapter<string> dataadapter2 = new arrayadapter<string>(mainactivity.this, android.r.layout.simple_spinner_dropdown_item, list1);                         dataadapter2.setdropdownviewresource(android.r.layout.simple_spinner_dropdown_item);                         dataadapter2.notifydatasetchanged();                         mspinnermake.setadapter(dataadapter2);                     }                       if (sp1.contentequals("college3")) {                         list<string> list = new arraylist<string>();                         list.add("manipal ");                         //list.add("university4");                         //list.add("university5");                           arrayadapter<string> dataadapter3 = new arrayadapter<string>(mainactivity.this, android.r.layout.simple_spinner_dropdown_item, list);                         dataadapter3.setdropdownviewresource(android.r.layout.simple_spinner_dropdown_item);                         dataadapter3.notifydatasetchanged();                         mspinnermake.setadapter(dataadapter3);                        // selectedmake = parent.getitematposition(position).tostring();                     }                   }                  @override                 public void onnothingselected(adapterview<?> parent) {                  }             });      mspinnermake.setonitemselectedlistener(new adapterview.onitemselectedlistener(){          @override         public void onitemselected(adapterview<?> parent, view view, int position, long id) {             selectedmake = parent.getitematposition(position).tostring();          }          @override         public void onnothingselected(adapterview<?> adapterview) {          }     });              mspinneryear.setonitemselectedlistener(new adapterview.onitemselectedlistener() {                 @override                 public void onitemselected(adapterview<?> parent, view view, int position, long id) {                     selectedyear = parent.getitematposition(position).tostring();                     // showing selected spinner item                     toast.maketext(parent.getcontext(), "selected year: " + selectedyear, toast.length_long).show();                 }                  @override                 public void onnothingselected(adapterview<?> parent) {                  }             });              mbuttonshow.setonclicklistener(new view.onclicklistener() {                 @override                 public void onclick(view v) {                      string eligiblebattery=fetcheligiblebattery(msqlitedatabase);                     mtextviewresult.settext(eligiblebattery);                 }             });          } 

and method data , query fetching data not working. when select data in spinners shows in logcat not fetching data query right below not working please help.

 private string fetcheligiblebattery(sqlitedatabase db) {          string battery="";         string select_battery_query = "select "+ databaseconstants.key_battery+" " + databaseconstants.table_car_details + " " + databaseconstants.key_car_make + " ='" +selectedmake +                 "' , "+ databaseconstants.key_car_model +" = '"+ selectedmodel+ "' , "+ databaseconstants.key_car_year+"= '"+selectedyear +"' ;";         log.d("database", "battery select query : " + select_battery_query);         cursor cursor = db.rawquery(select_battery_query, null);         try {             if (cursor.movetofirst()) {                 battery=cursor.getstring(cursor.getcolumnindex(databaseconstants.key_battery));             }         } catch (exception e) {             log.d("database", "error while trying icons database");         } {             if (cursor != null && !cursor.isclosed()) {                 cursor.close();             }         }         return battery;     }      public void fetchdatafromdbforspinners(sqlitedatabase db) {           string select_models_query = "select * " + databaseconstants.table_car_details + ";";          string model, make, year;         cursor cursor = db.rawquery(select_models_query, null);         try {             if (cursor.movetofirst()) {                 {                     model = cursor.getstring(cursor.getcolumnindex(databaseconstants.key_car_model));                     make = cursor.getstring(cursor.getcolumnindex(databaseconstants.key_car_make));                     year = cursor.getstring(cursor.getcolumnindex(databaseconstants.key_car_year));                      models.add(model);                      makes.add(make);                     years.add(year);                  } while (cursor.movetonext());             }         } catch (exception e) {             log.d("database", "error while trying events database");         } {             if (cursor != null && !cursor.isclosed()) {                 cursor.close();             }         } 

this query wrong please check fixed code

string select_battery_query = "select "+ databaseconstants.key_battery+" " + databaseconstants.table_car_details + " " + databaseconstants.key_car_make + " = " +selectedmake +" , "+ databaseconstants.key_car_model +" = "+ selectedmodel+ " , "+ databaseconstants.key_car_year+"= "+selectedyear ";