Android 按id检索记录不起作用？

我试图根据用户id显示记录，但仅显示上次更新的记录无法根据id显示整个记录我如何实现这一点让我发布代码：

下面是我根据id检索记录的代码：

  public List<Model_Task_List> getTaskListById(String id) {
        SQLiteDatabase db = this.getReadableDatabase();
        Model_Task_List model_task_list=new Model_Task_List();
        String selectQuery =  " SELECT  " +
                Model_Task_List.KEY_id + "," +
                Model_Task_List.KEY_username + "," +
                Model_Task_List.KEY_subject + "," +
                Model_Task_List.KEY_task + "," +
                Model_Task_List.KEY_taskid  +"," +
                Model_Task_List.KEY_owner+
                " FROM " + Model_Task_List.KEY_table + " WHERE "   +  Model_Task_List.KEY_owner + "= " + id  + "";
        List<Model_Task_List>listobj=new ArrayList<Model_Task_List>();
        Model_Task_List modelobj=new Model_Task_List();
        Cursor cursor = db.rawQuery(selectQuery, null);

        if (cursor.moveToFirst()) {
           do {
               modelobj.setId(Integer.parseInt(cursor.getString(cursor.getColumnIndex(Model_Task_List.KEY_id))));
               modelobj.setUserName(cursor.getString(cursor.getColumnIndex(Model_Task_List.KEY_username)));
               modelobj.setSubject(cursor.getString(cursor.getColumnIndex(Model_Task_List.KEY_subject)));
               modelobj.setTaskStatus(cursor.getString(cursor.getColumnIndex(Model_Task_List.KEY_task)));
               modelobj.setTaskID(cursor.getShort(cursor.getColumnIndex(Model_Task_List.KEY_taskid)));
               modelobj.setUserid(cursor.getString(cursor.getColumnIndex(Model_Task_List.KEY_owner)));
               listobj.add(modelobj);
            }while (cursor.moveToNext());
        }

        return listobj;

    }

---

我如何对这个问题进行排序？无论我是否正确处理这个问题

这个问题仅限于您的模型类，您只创建了一个模型类对象。 如果检索所有数据库记录，则每次获取记录时都创建一个新对象

    if (cursor.moveToFirst()) {
       do {
modelobj=new Model_Task_List();            modelobj.setId(Integer.parseInt(cursor.getString(cursor.getColumnIndex(Model_Task_List.KEY_id))));
           modelobj.setUserName(cursor.getString(cursor.getColumnIndex(Model_Task_List.KEY_username)));
           modelobj.setSubject(cursor.getString(cursor.getColumnIndex(Model_Task_List.KEY_subject)));
           modelobj.setTaskStatus(cursor.getString(cursor.getColumnIndex(Model_Task_List.KEY_task)));
           modelobj.setTaskID(cursor.getShort(cursor.getColumnIndex(Model_Task_List.KEY_taskid)));
           modelobj.setUserid(cursor.getString(cursor.getColumnIndex(Model_Task_List.KEY_owner)));
           listobj.add(modelobj);
        }while (cursor.moveToNext());
    }

---

该问题仅限于您的模型类，您只能创建一个模型类对象一次。 如果检索所有数据库记录，则每次获取记录时都创建一个新对象

    if (cursor.moveToFirst()) {
       do {
modelobj=new Model_Task_List();            modelobj.setId(Integer.parseInt(cursor.getString(cursor.getColumnIndex(Model_Task_List.KEY_id))));
           modelobj.setUserName(cursor.getString(cursor.getColumnIndex(Model_Task_List.KEY_username)));
           modelobj.setSubject(cursor.getString(cursor.getColumnIndex(Model_Task_List.KEY_subject)));
           modelobj.setTaskStatus(cursor.getString(cursor.getColumnIndex(Model_Task_List.KEY_task)));
           modelobj.setTaskID(cursor.getShort(cursor.getColumnIndex(Model_Task_List.KEY_taskid)));
           modelobj.setUserid(cursor.getString(cursor.getColumnIndex(Model_Task_List.KEY_owner)));
           listobj.add(modelobj);
        }while (cursor.moveToNext());
    }

---

如果你的

id

是字符串格式，你需要用引号括起来。如果你的

id

是字符串格式，你需要用引号括起来。非常感谢节省了我的时间非常感谢节省了我的时间