删除单个SQLite行 [英] Deleting a single SQLite row
问题描述
我正在尝试使用列表项的 onLongClick
删除一行,但有时它会删除该行,有时不会删除该行.也许我给它传递了错误的ID,但我没有得到真正的问题.
I am trying to delete a single row using onLongClick
of list item but sometime it deletes the row and sometimes doesn't. Maybe I am passing the wrong id to it I don't getting what actually problem is.
我尝试了一些代码,但从最近两天开始尝试,但是无法解决.
I have tried some code and I am trying from last 2 days but unable to resolve this.
下面是我的代码.
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, final long id) {
AlertDialog.Builder alert = new AlertDialog.Builder(FavouriteListActivity.this);
alert.setMessage("Do you want to unfavorite selected item ?");
alert.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Log.i("===========", "Position === " + position);
Log.i("===========", "long id === " + id);
deleteMethod(id);
showFavouriteList();
dialog.cancel();
}
});
alert.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
alert.show();
return true;
}
和deleteMethod
And deleteMethod
private void deleteMethod(long Id) {
try {
long shId = Id + 1;
SQLiteDatabase db = OpenHelper.getDataHelper(getApplicationContext());
String query = "DELETE FROM " + LocalDatabase.FAVORITE_LIST.TABLE_FAVOURITE_LIST + " WHERE " + LocalDatabase.FAVORITE_LIST.FAVOURITE_LIST_ID + " = " + shId;
Log.i("QUERY", "" + query);
db.execSQL(query);
db.close();
} catch (Exception e) {
e.printStackTrace();
}
}
虽然我没有收到任何错误,但是它没有从数据库或列表视图中删除项目
I am not getting any error, though, but it is not deleting item from database or from listview
推荐答案
首先在模型类中创建一个id变量,并为此生成getter和setter:
First make a id variable in your model class and generate getter and setter for that:
public static final String PRIMARY_ID="_id";
现在将primary_id设置为从光标建模:
Now set the primeary_id to model from the cursor:
if (cursor.moveToFirst()) {
do {
model = new FavouriteListVo(lngID, strName);
model.setStrName(cursor.getString(cursor.getColumnIndex(LocalDatabase.FAVORITE_LIST.FAVOURITE_LIST_NAME)));
model.setPrimId(cursor.getString(cursor.getColumnIndex(LocalDatabase.FAVORITE_LIST.PRIMARY_ID)));
arrayListFav.add(model);
} while (cursor.moveToNext());
}
现在要删除该行,请使用以下主键:
Now for deleting that row use this primary key:
public void onClick(DialogInterface dialog, int which) {
String id=model.getPrimId();
deleteMethod(id);
showFavouriteList();
dialog.cancel();
}
删除功能与您的删除功能完全相同,正如我在评论中提到的那样,问题出在id而不是您的删除功能:
The delete function is exactlu same as yours, as I mentioned in comment that the problem is with id not your delete function:
private void deleteMethod(long Id) {
try {
long shId = Id + 1;
SQLiteDatabase db = OpenHelper.getDataHelper(getApplicationContext());
String query = "DELETE FROM " + LocalDatabase.FAVORITE_LIST.TABLE_FAVOURITE_LIST + " WHERE " + LocalDatabase.FAVORITE_LIST.FAVOURITE_LIST_ID + " = " + shId;
Log.i("QUERY", "" + query);
db.execSQL(query);
db.close();
} catch (Exception e) {
e.printStackTrace();
}
}
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