Query Prepared Statement Does NOT Return ANY Values !URGENT! PLEASE HELP...

Question

Hi,
Please help me in the following.I'm desperate...
I'm using PreparedStatement to do multiple queries in the same Table of a Database(ACCESS).
The rows of the Table look i.e like this :
(TABLE NAME == PERSONS)
PERSON_INDEX__TIME_PERIOD_________SPORT
1_______________1________________Basketball
1_______________2________________Football
1_______________3________________Tennis
2_______________1________________Something
I populate my PreparedStatement using something like :
java.sql.PreparedStatement st = con.createPreparedStatement("SELECT SPORT FROM PERSONS WHERE PERSON_INDEX=? AND TIME_PERIOD=?");
Now, when I do something like :
try
st.setInt(1,1);
st.setInt(2,1);
st.addBatch();
}catch(SQLException e){}
st.executeQuery();
ResultSet results = st.getResultSet();
while ( results.next() )
System.out.println("->"+results.getString("SPORT"));
I trully get as output :
->BasketBall
But when I populate it some more :
try
st.setInt(1,1);
st.setInt(2,1);
st.addBatch();
//***Query some more***
st.setInt(1,1);
st.setInt(2,2);
st.addBatch();
}catch(SQLException e){}
... and I execute I DON'T GET :
->BasketBall
->Football
but NOTHING!!! - the ResultSet HAS NO ROWS
This thing is driving me mad.
Can you please help me out?
Please post the code if neccessary...

Answer 1

There is something wrong in your understanding of batching the statements. Basically you will add either update or insert or delete statements to your batch.
If you add a select statement, it will throw 'java.sql.BatchUpdateException: invalid batch command'. And moreover 'st.executeBatch()' is the method you need to invoke.
If you don't execute the batch using 'executeBatch()' method then, it must throw the exception,
'java.sql.SQLException: error occurred during batching: batch must be either executed or cleared'.
You need to rework on your code, I believe.
Sudha