How to count no of records returned from a query?

Question

Hello,
I need to find out how many records displayed from a query without writing any other queries.
i mean that.
I have a query such as:
query = "select * from users";
and the resultset for it is rs.
and i need to display how many records fetched from this query without using any other query such as "select count(user_id) from users" etc.
Is there any function ?

Answer 1

No, unfortunately there is no method or property that will tell you how many rows have been returned by a query.
People use many different techniques.
1.The simplest would be, keep incrementing a counter in while ( rs.next() ) and at the end you'll have the count. But only at the end, after the loop.
2. Run another query with count(*) just to fetch the count.
3. Run the same query twice, once for counting and then again for printing out. Very dumb idea though, might as well do 2. suggested above.
4. If you have a scrollable resultset, you could go to the lastRecord and then getRow number and hence know how many there are and then rewind the resultset. I don't know how advisable using scrollable resultsets is.
5. Create a slightly clumsy query like : select count(*) as "totalcount", emp_id, emp_name, emp_email, emp_phone from employees group by emp_id, emp_name, emp_email, emp_phone. You'll need to use the group by clause since count() is an aggregate function and you can't mix aggregate functions and columns unless you add the group by to all the columns you're fetching.