I'm sorry, you are way off here in what this actually does.
mysql_affected_rows is only going to tell you how many rows were
affected by the execution of the last statement made on your current
connection. It is not an interface to a magic genie maintaining watch
over the state of your entire database.
The only ways you might accomplish anything even remotely like what
you have in mind are:
have your watcher thread thread make a snapshot of the entire
db and run a diff on every cycle which would be ridiculously expensive
in terms of execution time not to mention locking up database access
pretty good.
OR
have the external updating process record a log of changes to
a particular table, then you monitor thread can scan that table for
new entries.
- michael dykman
On Tue, Nov 17, 2009 at 7:06 AM, Gaurav Nigam (TMP-Japan)
<g.ni...@zensar.com> wrote:
> Can somebody please help!
>
> There are two queries -
> 1. How can I detect from my code whether a table has been updated in the
> Database manually (I am firing delete from testtable where SrNo>=9; on the
> Database server) and not from the code itself. I am running this code -
>
> conn = mysql_init(NULL);
>
> /* Connect to database */
> if (!mysql_real_connect(conn, server, user, password, database, 0,
> NULL, 0)) {
> fprintf(stderr, "%s\n", mysql_error(conn));
> exit(1);
> }
>
> my_ulonglong affect_fields;
> while(1)
> {
> affect_fields = mysql_affected_rows(conn);
> if ((long) affect_fields >=1)
> {
> printf("%ld products updated\n\n", (long)
> affect_fields);
> }
> }
>
> 2. And if the table is really updated/inserted/deleted for any record then
> how to check which that record was.
>
> Regards,
> Gaurav.
>
--
- michael dykman
- mdyk...@gmail.com
"May you live every day of your life."
Jonathan Swift
Larry's First Law of Language Redesign: Everyone wants the colon.
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