Getting Problem after Deleting a record from Record Store

Question

I am trying to create a simple application for mobile device. This application storing some records. I used RMS for this. These records i show in a list. But i tried to show list of records after deleting any record then list shows only prior records of deleted records n then shows exception as
Recordsjavax.microedition.rms.InvalidRecordIDException
The code i written as follows
For storing data
public void storeExercise(String EName, String Etime)
try
//System.out.println("AAAA");
recordstore = RecordStore.openRecordStore("Test3",true);
catch (Exception error)
//System.out.println("EEEE");
System.out.println("Exception"+error);
try
byte[] outputRecord;
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
DataOutputStream outputdataStream = new DataOutputStream(outputStream);
outputdataStream.writeUTF(EName);
outputdataStream.writeUTF(Etime);
outputdataStream.flush();
outputRecord = outputStream.toByteArray();
recordstore.addRecord(outputRecord, 0, outputRecord.length);
outputStream.reset();
outputStream.close();
outputdataStream.close();
zlist.append(EName+Etime, null);
display.setCurrent(zlist);
catch (Exception error)
System.out.println("Exception in writing Records"+error);
for getting records
public void getExercise(ZimList zlist)
this.zlist = zlist;
try
//System.out.println("AAAA");
recordstore = RecordStore.openRecordStore("Test3",true);
//recordstore.closeRecordStore();
catch (Exception error)
//System.out.println("EEEE");
System.out.println("Exception"+error);
try
//System.out.println("Hello");
String Ename = null;
String Etime = null;
byte[] byteInputData = new byte[100];
ByteArrayInputStream inputStream = new ByteArrayInputStream(byteInputData);
DataInputStream inputDataStream = new DataInputStream(inputStream);
for (int x=1; x<= recordstore.getNumRecords() ; x++ )
System.out.println("Record Id ="+x);
//if (x != InvalidRecordID)
recordstore.getRecord(x, byteInputData, 0);
Ename = inputDataStream.readUTF();
Etime = inputDataStream.readUTF();
inputStream.reset();
Final = Ename + Etime;
System.out.println("Insert" + Final);
zlist.insert(x-1,Final,null);
inputStream.close();
inputDataStream.close();
//recordstore.closeRecordStore();
catch (Exception error)
System.out.println("Exception in Reading Records"+error);
/*if (recordstore.listRecordStores() != null)
try
recordstore.deleteRecordStore("My Record Store");
catch (Exception error)
System.out.println("Exception"+error);
And for deleting records I write
public void deleteExercise(int index)
try
//System.out.println("AAAA");
recordstore = RecordStore.openRecordStore("Test3",true);
//recordstore.closeRecordStore();
catch (Exception error)
//System.out.println("EEEE");
System.out.println("Exception"+error);
if (recordstore.listRecordStores() != null)
try
byte[] byteInputData = new byte[100];
ByteArrayInputStream inputStream = new ByteArrayInputStream(byteInputData);
DataInputStream inputDataStream = new DataInputStream(inputStream);
for (int x=1; x<= recordstore.getNumRecords() ; x++ )
recordstore.getRecord(x, byteInputData, 0);
if (x == index)
recordstore.deleteRecord(index);
//x--;
inputStream.reset();
break;
inputStream.close();
inputDataStream.close();
catch (Exception error)
System.out.println("Exception in Deleting Records"+error);
Please Help me bcz i am new in j2me development n having no experience

Answer 1

Ok ...
When you add records in you store, the J2ME implementation create an ID.
In the database, there is a list like that with ID <--> ]byte[ ]
You can get back a record with a this ID.
When you delete a record, it deletes the row. Lets say you have stored 3 records and that the ID are 1, 2, 3 ... if you delete the second one, then you have still in the database IDs 1 and 3.
That's why you have this exception : you are iterating with an ID 1, 2, 3, 4, 5 ... if one is delete there is no reorganization. (If you add an other record, it could be stored with ID 2).
To read all the records, you should get a list of existing IDs. Take a look at the API. Here is a piece of code, that you work but I have not tested :
RecordStore rs;
RecordEnumeration re = rs.enumerateRecords(null, null, false);
while (re.hasNextElement()) {
  String str = new String(re.nextRecord());
  System.out.println("Record: " + str);         
} Hope it will help you.
Regards