XML not generating when null data present in the table

Question

Lets consider employee and dept tables and say one employee works in multiple departments,
Dept table data:
case1:
emp_id     dept_name      dept_id
1     Oracle     55
1     Datawarehouse     56
case 2:
emp_id     dept_name      dept_id
2     Oracle     55
2     Datawarehouse     56
2     Clearing House     
2     Java     
In Production environment, the below code generates xml for case 1 but not for case 2. In test environment , xml is getting generated for both the cases. It looks like null handling issue but why the same code behaves differently in qa and prod. dbms_xmlgen.getXML is not generating any exceptions. Any help would be appreciated.
DECLARE
ctx dbms_xmlgen.ctxHandle;
xml CLOB;
emp_no NUMBER := 7369;
i PLS_INTEGER;
BEGIN
ctx := dbms_xmlgen.newContext('SELECT emp_id,name,salary, cursor(select emp_id, dept_name,dept_id from dept b where a.emp_id=b.emp_id) FROM emp a WHERE a.empno = '|| emp_no);
xml := dbms_xmlgen.getXML(ctx);
i := dbms_xmlgen.getNumRowsProcessed(ctx);
dbms_output.put_line(TO_CHAR(i));
END;
Edited by: user512219 on May 22, 2012 12:52 PM

Answer 1

Give the database version anyway, it could be a known bug.
Are the NULL column(s) part of the join predicate?
It's difficult to help in this situation, nobody but you has the real test case, so try to give as much details as possible.
Wild guess : does this make a difference?
dbms_xmlgen.setNullHandling(ctx, dbms_xmlgen.EMPTY_TAG);Edited by: odie_63 on 22 mai 2012 23:40