it's not required by the DB, it's a requirement of CursorAdapter. You can
have a table without it.
It also does not have to be unique nor a primary key... it's just a value
the adapter needs for getItemId, so if you're not using getItemId you can
ignore those values (i always do.. not always the
As I understand it _id is a required field for SQLite database tables
accessed by Android. Didn't know this also applies to string collections.
In any case, since you control the UI of your application you can also
decide to not display the _id field data. You may still need to provide the
dat
This is a convention in the framework that the primary key be called "_id",
used by "simplified" adapter classes to make life easier for the developer.
--
Kostya Vasilyev -- http://kmansoft.wordpress.com
07.12.2010 1:33 пользователь "Ashish" написал:
> Well as per my understanding it is of ut
Well as per my understanding it is of utmost importance to have
_id column in android sqlite database.
This is the default way of making each record unique in its nature...
so, even if you don't use any primary key, ur records won't be
duplicate.
Regards,
Ashish
On Dec 3, 1:31 pm, "Jonas Pet
On 12/03/2010 09:04 AM, pramod.deore wrote:
When I tried this as
> [...]
Cursor c = sampleDB.rawQuery("SELECT RoomID as _id FROM
"
+ROOM_TABLE_NAME, null);
> [...]
new String[] {"RoomID"},
> [...]
java.lang.IllegalArgumentException: column
If I want to read one column from table and display these values
(RoomName)on list then how to do this? if that table doesn't have _id
field.
should I read the RoomName of each row and store them into array. and
then using arrayAdapter display the list?
On Dec 3, 1:04 pm, "pramod.deore" wrote:
>
When I tried this as
try
{
sampleDB = this.openOrCreateDatabase(SAMPLE_DBNAME,
MODE_PRIVATE, null);
Cursor c = sampleDB.rawQuery("SELECT RoomID as _id FROM
"
+ROOM_TABLE_NAME, null);
System.out.println ("Tota
Um, you might try something like "select RoomID as _id ..."
Best / Jonas
On 12/03/2010 08:40 AM, Kumar Bibek wrote:
You cannot in this case. This is a mandatory requirement.
"pramod.deore" wrote:
Hi Bibek, Thanks for reply. But my table RoomTable have only three
colu
oh. Thanks
On Dec 3, 12:40 pm, Kumar Bibek wrote:
> You cannot in this case. This is a mandatory requirement.
>
> "pramod.deore" wrote:
> >Hi Bibek, Thanks for reply. But my table RoomTable have only three
> >columns, RoomID, RoomName, and RoomSuffix. It doesn't have _id field.
> >Then how to u
You cannot in this case. This is a mandatory requirement.
"pramod.deore" wrote:
>Hi Bibek, Thanks for reply. But my table RoomTable have only three
>columns, RoomID, RoomName, and RoomSuffix. It doesn't have _id field.
>Then how to use Cursor Adapter here.
>
>On Dec 3, 11:55 am, Kumar Bibek wr
Hi Bibek, Thanks for reply. But my table RoomTable have only three
columns, RoomID, RoomName, and RoomSuffix. It doesn't have _id field.
Then how to use Cursor Adapter here.
On Dec 3, 11:55 am, Kumar Bibek wrote:
> Cursor Adapters require the table to have a _id field. Else, you would get
> this
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