XPath function orcl:query-database usage

Question

According to the limited documentation I can find for this XPath function, I should be able to return a nodeset enclosed in xml elements -
"Returns a node-set by executing the sql-query against the specified database. The second parameter rowset indicates if the rows should be enclosed in a element. The third parameter row indicates if each row should be enclosed in a element."
However, whatever second and third parameters I pass in to this function, it always returns a single string consisting of the selected fields and rows concatenated together.
Does anyone know how (or if) I can use this function to return a resultset as an XML nodeset? (All the examples I've been able to find for this function set the second & third parameters = false())

Answer 1

Try this example (it uses internal orabpel table):
orcl:get-content-as-string(orcl:query-database('select id, process_instance from bpel_variable_sensor_values where id < 30',true(),true(),'jdbc/BPELServerDataSourceWorkflow'))
it generates something like this (string):
<ROWSET> <ROW num="1"> <ID>23.0</ID> <PROCESS_INSTANCE>21.0</PROCESS_INSTANCE> </ROW> <ROW num="2"> <ID>25.0</ID> <PROCESS_INSTANCE>21.0</PROCESS_INSTANCE> </ROW> <ROW num="3"> <ID>27.0</ID> <PROCESS_INSTANCE>21.0</PROCESS_INSTANCE> </ROW> <ROW num="4"> <ID>29.0</ID> <PROCESS_INSTANCE>21.0</PROCESS_INSTANCE> </ROW> </ROWSET>
or define this element type in your wsdl file (or your xsd):
<element name="ROWSET">
<complexType>
<sequence>
<element name="ROW">
<complexType>
<sequence>
<element name="ID" type="string"/>
<element name="PROCESS_INSTANCE" type="string"/>
</sequence>
<attribute name="num"/>
</complexType>
</element>
</sequence>
</complexType>
</element>
and try to assign the output to variable of that type(without orcl:get-content-as-string). It should work.