How to get row by row

Question

hai all,
1Q. let us assume that i am accessing a table.
let us assume its emp table with fields eno, ename, sal then by using result set i have to get the resultset as
1 bvrkii 4000
2 xxxxxx 5000
---- and so on
if i am accessing a dept table with fields deptno, deptnm then my resultset should be as
1 aaaaa
2 bbbbb
what i want to say is, let any number of rows or columns in the table. but i have to get them row by row till the end of the resultset. is it possible.
2Q. is there any command in java just as in vb
rs.recordcount()
where rs is a result set.
3Q. is there any way to find the field names of a table in java.
that is if i am using emp table means it has
to give the result as the fields are
eno
ename
sal
Thanks in advance.
by
bvrk.

Answer 1

1) Yes, you can keep looping through a ResultSet to retrieve all the rows. You can just place your rs.next() call inside a loop, since it returns false when there are no more rows.
while(rs.next())
   String no = rs.getString("eno");
   String name = rs.getString("ename");
   //etc...
}As far as how many columns are in the table, since you know what table you're pulling data from, you should know how many columns there are.
2) There is no method to give you the count of a ResultSet, mainly because of the nature of the ResultSet, which doesn't actually contain data itself, but is really just a cursor that moves along the data in the database. So it doesn't really know where the end is until it gets there. However, give me the reason you want the count of the rows, and i'll give you a reason why it's not necessary.
3) Retrieving table and column names is database independent, so you'll need to construct a SQL query with the correct syntax for whichever database you're using, retrieve the column names from that, and then use them to retrieve data from your other tables. Most databases provide a few system tables for this reason.