SQL SELECT in bind operation

Question

Hi,
Here is a snippet of some sample code. The commented
query works and I recieve my data. The setString sets
the string but the query fails. Am I missing something.
Bear in mind that the connection is fine etc. Just that
the commented select statement works. But the one
requiring the param does not!
try
//string request("select REF(MSNNr) from secure_data MSNNr where MSNNR_M='SSZ0000001'");
string request("select REF(MSNNr) from secure_data MSNNr where MSNNr_m = :idnumber");
OCCI_STD_NAMESPACE::string str("SSZ0000001");
query->setString( 1, str);
cout << query->getString(1) << endl;
cout << query->getSQL() << endl;
ResultSet *result = query->executeQuery();
if(result->next())
Ref<MSNNr> msnid = result->getRef(1);
cout << "found something" << endl;
catch(SQLException ex)
cout << "exception thrown : " << ex.what() << endl;
Many Thanks,
Raffaele

Answer 1

That is more straightforward, but DachshundThor's
suggestion (above) implicitly ties the tables
together in the same way.Would that not produce a cartesian join?Yes, it would start with the Cartesian product, but
then the WHERE-clauses would cut that down to what an
ordinary join would have produced. You are just describing the way ordinary relational databases do joins (conceptually): start with the full Cartesian product and whittle it down. That is just conceptual, of course, it would never work if you actually implemented that way.
The correct select statement (since authors are not assigned ISBNs) is probably something like
select * from author a, book b where b.authorid = a.id