How to return two XML result sets using the function

Question

Hi Experts,
Thanks.

Answer 1

So that I want to return two XML result sets if the query returns more than 50,000 records.
One XML result set with 50,000 and another XML result set with remaining records.
How to incorporate this in my function.
Have the function return a collection of CLOB then.
DBMS_XMLGEN can handle pagination so it's easy to adapt your existing code.
Here's an example fetching data in batches of max. 3 rows each, using a pipelined function :
SQL> create or replace type clob_array is table of clob;
  2  /
Type created
SQL>
SQL> create or replace function genXmlRowset (p_deptno in number) return clob_array pipelined
  2  is
  3    ctx    dbms_xmlgen.ctxHandle;
  4    doc    clob;
  5  begin
  6 
  7    ctx := dbms_xmlgen.newContext('SELECT empno, ename FROM scott.emp WHERE deptno = :1');
  8    dbms_xmlgen.setBindValue(ctx, '1', p_deptno);
  9    dbms_xmlgen.setMaxRows(ctx, 3);
10 
11    loop
12 
13      doc := dbms_xmlgen.getXML(ctx);
14      exit when dbms_xmlgen.getNumRowsProcessed(ctx) = 0;
15      pipe row (doc);
16 
17    end loop;
18 
19    dbms_xmlgen.closeContext(ctx);
20 
21    return;
22 
23  end;
24  /
Function created
SQL> set long 5000
SQL> select * from table(genXmlRowset(30));
COLUMN_VALUE
<?xml version="1.0"?>
<ROWSET>
<ROW>
  <EMPNO>7499</EMPNO>
  <ENAME>ALLEN</ENAME>
</ROW>
<ROW>
  <EMPNO>7521</EMPNO>
  <ENAME>WARD</ENAME>
</ROW>
<ROW>
  <EMPNO>7654</EMPNO>
  <ENAME>MARTIN</ENAME>
</ROW>
</ROWSET>
<?xml version="1.0"?>
<ROWSET>
<ROW>
  <EMPNO>7698</EMPNO>
  <ENAME>BLAKE</ENAME>
</ROW>
<ROW>
  <EMPNO>7844</EMPNO>
  <ENAME>TURNER</ENAME>
</ROW>
<ROW>
  <EMPNO>7900</EMPNO>
  <ENAME>JAMES</ENAME>
</ROW>
</ROWSET>
SQL>
(and don't forget to use bind variables in your query)