Martin Dubuc wrote:
> if (q) {
> ... no problems in using query object
[snip]
> However, if I construct a Query that contains a syntax error and invoke the
> store method, the query object does not return null, as I would have
> expected.
Do you have exceptions enabled? (They are enabled by default.) If so,
the bad query is throwing an exception, so it never gets to the 'if'.
I modified examples/simple1.cpp to demonstrate this feature:
> Index: examples/simple1.cpp
> ===================================================================
> --- examples/simple1.cpp (revision 2517)
> +++ examples/simple1.cpp (working copy)
> @@ -50,8 +50,9 @@
> cmdline.user(), cmdline.pass())) {
> // Retrieve a subset of the sample stock table set up by resetdb
> // and display it.
> - mysqlpp::Query query = conn.query("select item from stock");
> - if (mysqlpp::StoreQueryResult res = query.store()) {
> + mysqlpp::Query query = conn.query("select item from stocxk");
> + mysqlpp::StoreQueryResult res = query.store();
> + if (query) {
> cout << "We have:" << endl;
> mysqlpp::StoreQueryResult::const_iterator it;
> for (it = res.begin(); it != res.end(); ++it) {
It works fine.
The last changes to this feature were made in 3.0.2, so if you're using
3.0.0 or 3.0.1, you should upgrade.
