Question

我正在解析xml，在解析了xml之后我将记录存储在DB中。我使用SQLite作为DB。我的数据采用xml中的幻灯片形式。当我在数据库中存储一些幻灯片时，我得到重复的条目。例如，如果我的xml包含3张幻灯片，则在DB 6中存储不同的项目ID，因此每张幻灯片都会保存2次。这就是我正在做的事情

ArrayList<SlideShowItem>slideItems=Utils.database.getSlideItemOfUrl(Constants.StoriesTable,tempSlideShow.getFullStoryUrl().substring(0, index - 1), type);

                            if (slideItems == null) {
                                Log.d("store in DB: ", " when SlideItems == null ");

                                Log.d("SlideShow Title:   ", tempSlideShow.getTitle());
                                Log.d("SlideShow pub Date:   ", tempSlideShow.getPubDate());
                                Utils.database.storeSlideItem(Constants.StoriesTable, myUrl, tempSlideShow.getSlideShow(), null);
                                //Utils.topStorySlidesArrayList = slideItems;

                            } else {
                                //Log.d("SlideShow Title:   ", tempSlideShow.getTitle());
                                Log.d("Already in DB ", " when SlideItems is not null ");
                                Utils.topStorySlidesArrayList = slideItems;

                            }

请感谢任何帮助。我想我错了一些检查。请帮助我。

Utils.database.storeSlideItem包含以下代码：

public synchronized void storeSlideItem(String tableName, String url, ArrayList<SlideShowItem> list, String type) {

    System.out.println("size of the Array list:   " + list.size());

    String newType = null;
    if (type == null) {
        newType = "List";
    }else{
        newType = type;
    }       

    try {
        for (int i = 0; i < list.size(); i++) {
            SlideShowItem item = list.get(i);
            String itemUrl = url + i;// Unique URL for the DB;
            String imgString = null;
            Drawable drawable = item.getImage();
            if (item.getBody() != null) {
                item.setBody(item.getBody().replace('\'', '`'));
                // replace as it create syntax error for storing data
            }
            if (item.getSubTitle() != null) {
                item.setSubTitle(item.getSubTitle().replace('\'', '`'));
            }

            if (drawable != null) {
                Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);

                byte[] b = baos.toByteArray();
                imgString = Base64.encodeBytes(b);
            }

            if (isOpen()) {
                myDB.execSQL("INSERT INTO " + tableName + "(" + column[1] + "," + column[2] + "," + column[3] + "," + column[4] + "," + column[6]
                        + "," + column[7] + ",type) VALUES('" + itemUrl + "','" + item.getSubTitle() + "','" + item.getBody() + "','"
                        + item.getImagePath() + "','" + item.getIndex() + "','" + imgString + "','" + newType + "Slide')");
                if (item.getBody() != null) {
                    item.setBody(item.getBody().replace('`', '\''));// " ' "
                    // replace as it create syntax error for storing data
                }
                if (item.getSubTitle() != null) {
                    item.setSubTitle(item.getSubTitle().replace('`', '\''));
                }

                if (tableName.equals(Constants.StoriesTable)) {
                    item.setItemId(getItemID(tableName, itemUrl));
                    Utils.hashListStoriesIds.put(itemUrl, item.getItemId());

                    if (imgString != null) {
                        Utils.hashListImages.put(item.getItemId(), new Boolean(true));
                    } else {
                        Utils.hashListImages.put(item.getItemId(), new Boolean(false));
                    }
                }
            }
        }
    } catch (Exception e) {
        Log.e("Error", "Exception: storeSlideItem type " + e.toString());
    } finally {
        closeConnection();
    }

}

Answer 1

您的商品中是否有唯一的ID字段？如果是这样，您可以将其作为数据库模式中的主键，这将强制所有条目不同或在添加重复时抛出异常，以便您可以追踪问题。

获取DB中的重复条目

1 个答案: