Problem while querying MS Acess DB through JAVA

Question

Hi,
I am using a query as follows:
strQuery = "select * from A where UID=?";
//have set the parameter
resultSet = ps.executeQuery();
sysout(resultSet);//printing resultSet Object
if(null != resultSet)
//have created object of class UsrDetails
UsrDetails u =new UsrDetails();
while(resultSet.next())
sysout(resultSet);//printing resultSet Object again
//set the values for UsrDetails.
I hve given uid which is not present in the table A. Now the first sysout is getting printed(not null) but the control is not going into while i.e second sysout is not getting printed.
I don't know why this is happening. I guess I shld get null if the rcrd is not present in the DB.

Answer 1

chasan wrote:
ResultSet is not null if the number of rows returned is zero.
Try replacing if(null != resultSet) with if(resultSet.next())
Wrong. The correct idiom is:
while (resultSet.next())
    // process the results in here.
}>
Then if it enters the if block invoke resultSet.previous() so that the first record is not lost.Nonsense. The first record isn't lost. This is poor advice from start to finish.
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