从Parse Table中删除一行

时间:2015-02-17 14:50:55

标签: android parse-platform

我有一个名为Favorite tags的表。它有字段 - 标签,用户(指针分配用户objectid).where用户可以存储标签,并将用户对象作为指针存储在用户字段中,用户从收藏夹中删除标签

存储/更新:工作正常。

           ParseObject favtagobject = new ParseObject("Favourite");
            favtagobject.put("Tag", "#" + keyword);
                favtagobject.put("User", ParseUser.getCurrentUser());
                favtagobject.saveInBackground();

从表中删除/删除标记:以下代码无效

           ParseObject favtagobject = new ParseObject("Favourite");
             favtagobject.put("Tag", "#" + keyword);
                favtagobject.put("User", ParseUser.getCurrentUser());
                favtagobject.deleteInBackground(new DeleteCallback() {

                    @Override
                    public void done(com.parse.ParseException arg0) {
                        // TODO Auto-generated method stub
                        System.out.println("deleted the tag succesfully");
                    }
                });

我想从表中删除一行,我知道要删除哪一行。请帮帮我。

2 个答案:

答案 0 :(得分:6)

基本上,当您使用新的ParseObject("收藏")时,'它将构造一个新的ParseObject。在您调用任何.save()变体之前,数据库中不存在此parseObject。因此当你这样做时

    ParseObject favtagobject = new ParseObject("Favourite");
         favtagobject.put("Tag", "#" + keyword);
            favtagobject.put("User", ParseUser.getCurrentUser());
            favtagobject.deleteInBackground(new DeleteCallback() {

                @Override
                public void done(com.parse.ParseException arg0) {
                    // TODO Auto-generated method stub
                    System.out.println("deleted the tag succesfully");
                }
            });

您所做的只是创建一个新对象,该对象在您的数据库中不存在然后尝试删除它?您正在寻找的是

    ParseQuery<ParseObject> query = ParseQuery.getQuery("Favourite");
    query.whereEqualTo("Tag", "#" + keyword);
    query.whereEqualTo("User", ParseUser.getCurrentUser());
    query.getFirstInBackground(new FindCallBack() {

            @Override
            public void done(ParseObject object, com.parse.ParseException arg0) {
               // TODO Auto-generated method stub
                   object.delete();
                   object.saveInBackground();
            }
        }););

这将首先从您的数据库中获取对象,然后从表中删除该行并保存对该对象所做的更改!

答案 1 :(得分:0)

感谢Bart de Ruijter。这对我也有用。

ParseQuery<ParseObject> query = ParseQuery.getQuery("Objects");
    query.getInBackground(objectID, new GetCallback<ParseObject>() {
        @Override
        public void done(ParseObject object, ParseException e) {

            try {
                object.delete();
                object.saveInBackground();

                Intent dashboard = new Intent(getApplicationContext(),DashboardActivity.class);
                Toast.makeText(getApplicationContext(), "Deleted Successuly.", Toast.LENGTH_SHORT).show();
                startActivity(dashboard);

            } catch (ParseException e1) {
                e1.printStackTrace();
            }


        }
    });