You have not fetched any data yet.
I would suggest reading the DBI/DBD docs, and some
working programs.
Aamer Rauf wrote:
In my perl script I do the following:
my $sth = $dbh->prepare("SELECT MAX(Id) FROM sometable");
my $id = $sth->execute();
print "id: $id\n";
It prints 1 which I guess is the number of rows selected. I was expecting that
it would give me the highest id in that table. How can I get that? Thanks for
the help.
Petre Agenbag wrote:
also makes sense to me to be able to have a get_last_entry() function,
or a total_rows_in table() (well, I guess you can do that with a select
I'm sure I've said it personally a dozen times (and the archives
probably show many other people saying it too); you're not thinking in
SQL; what's wrong with SELECT MAX(ID)?
How about doing what I always do:
CREATE TABLE x (
ID int unsigned not null auto_increment primary key,
MTime timestamp not null,
....
);
Then for the 'most recently affected' row, just do SELECT MAX(MTime) and
for the last inserted row ID, do SELECT MAX(ID). These things are all
accounted for by adding the data to your tables themselves, not by
getting MySQL to track them for you (since if you don't need them, you
can speed up your tables by not having them).
PS, for cross-join tables, I always use a format like:
CREATE TABLE x-y (
xID int unsigned not null,
yID int unsigned not null,
MTime timestamp not null,
...,
PRIMARY KEY(xID, yID)
);
I have a feeling I'm going to put these up on my coding site one of
these days.
--
Michael T. Babcock
C.T.O., FibreSpeed Ltd.
http://www.fibrespeed.net/~mbabcock
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__________________
Aamer Wali Rauf
__________________
TC16/123
Jefferson Lab
Newport News VA 23606
ph: (757) 269 7346
fax: (757) 269 6273
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