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我試圖讓我的數據庫上的所有項目,而第一步是我的數據庫是空的,之後,我從我的數據庫插入一些項目。我正確插入(dont有任何錯誤並且插入的num比0大)。 但插入後試圖從數據庫獲取所有項返回dbAdper.getAllTitles();在db.query上爲空而db爲空
這裏是我的代碼
public ArrayList<Object> getWantedItemsList(Context context,String item,String item2,String item3,String item4){
ArrayList<Object> ListRssLinkAndTitle=new ArrayList<Object>();
DBAdapter dbAdper=new DBAdapter(context);
Cursor CursorDb =null;
try
{
dbAdper.open();
dbAdper.drop();
dbAdper.createTable();
dbAdper.insertTitle(context,"Ynet", "http://www.ynet.co.il/Integration/StoryRss2.xml", "rtl",null);
dbAdper.insertTitle(context,"BBC", "http://feeds.bbci.co.uk/news/world/us_and_canada/rss.xml", "rtl",null);
CursorDb =dbAdper.getAllTitles();
CursorDb.moveToFirst();
if (CursorDb.getCount()>0)
do
{
ListRssLinkAndTitle.add(new rssLinkAndTitle(CursorDb.getString(CursorDb.getColumnIndex(item)),CursorDb.getString(CursorDb.getColumnIndex(item2)),CursorDb.getString(CursorDb.getColumnIndex(item3)),CursorDb.getBlob(CursorDb.getColumnIndex(item4))));
}
while(CursorDb.moveToNext());
}
finally{
if (CursorDb.equals("null"))
CursorDb.close();
dbAdper.close();
return ListRssLinkAndTitle;
}
}
並得到空的方法是
public Cursor getAllTitles() throws SQLException
{
return db.query(DATABASE_TABLE, new String[] {
KEY_ROWID,
link,
RssTitle,
Rtl,
image
},
null,
null,
null,
null,
null
);
}
添加更多代碼的DatabaseAdapter代碼,如構造函數部分 – TNR