Re: Perl, Oracle, and Xquery

[Moron]

Maybe I am misunderstanding this, but are you trying to prepare more than one SQL statement in one go? You have to split it up and get rid of any delimiters (statement-terminating semicolons?) that might be in some way special to Xquery as opposed to obeying the pure SQL syntax.

[jozxyqk]

Even if I just prepare the statement "xquery" on a line alone (which, at least in the SQLPlus program, is an indicator that xquery follows), I get the "no such SQL command" error.

DBD::Oracle::st execute failed: ORA-00900: invalid SQL statement (DBD ERROR: OCIStmtExecute) [for Statement "xquery"] at oracledbitest.pl line 62.

[varian]

"XQUERY" is a command to set a mode in the SQL interpreter SQL*Plus. So it is not send to the backend database engine.
Once you have set XQUERY mode then the following statement ('.....') will be embedded in a SELECT XQUERY statement by SQL*Plus before it is send to the database engine.

So if you would want to do something similar from within Perl you would need to enter in your prepare method a text like this:

SELECT XQUERY('......' RETURNING CONTENT) FROM dual;

NB: xquery SQL extensions are not supported by all databases

[jozxyqk]

Thank you, that was a much more helpful explanation than the one from Moron. I was not aware of this additional step.

[Moron]

It ain't lying. xquery is not an SQL command. As I already explained, you have to extract each PURE SQL statement from your XQuery script before submitting them individually via DBI.

[jozxyqk]

So I need to take the xquery and translate it back into SQL? There's no easier way to just parse xquery naturally in Perl? It doesn't have to be with DBI/DBD.