Assignment Question with a DB

Question

Hi
I have a mysql db.
After executinf a select query, with returned resultset
containing 2 columns, say date and x value,
- how do I assign each row using jdbc
to 2 independent arrays ?
- how do I find out the row sizes (ie # rows retrieved)
from the resultset ? cuz with that, then I could set
the array sizes that are assigned by resultSet.
Any help is appreciated.

Answer 1

There is no good way to detemine the size of a ResultSet without a fair bit of work (looping through the ResultSet can be time-consuming on larger result queries, and requerying the database is always time-intensive). Also, requerying the database could lead to problems... if someone else inserts a row between when you run your "COUNT" query and when you run your real query, you're gonna have an ArrayIndexOutOfBoundsException if you try to use the count variable to create the arrays ahead of time.
Using ArrayLists or Vectors, (or another datatype of that sort) usually works best for your situation. If you need to store multiple bits of information at each index, create another class that stores those variables (ie. name and date), and store those in the ArrayList.