GET String from databse

Hi All,
can any one help me on urgent basis for below
I am having database connection program having a query which generate a string for XML format.
after executing this program i am getting string as a null.
please have a look for below program
 sql.append("SELECT XMLRoot (XMLELEMENT ")
 .append(" (\"CC_Hierarchy\",xmlattributes ( '0' as \"id\" ),") // \" nothing but "" in sql editor
 .append(" (SELECT DBMS_XMLGEN.getxmltype")
 .append(" (DBMS_XMLGEN.newcontextfromhierarchy")
 .append(" ('SELECT LEVEL,")
 .append(" XMLELEMENT (\"item\",")
 .append(" xmlattributes (cc_nbr || '' - '' ||CC_NM||DECODE(CC_NBR,DIV_CC_NODE,'' ''||BU_NM||'' ''||DIV_NM||'' ''||CFO_NM||''''||FM_NM||'''','' '') AS \"text\",")
 .append(" cc_nbr AS \"id\",")
 .append(" DECODE (SUBSTR (cc_nbr, 0, 1),''S'', 1, 0 ) AS \"child\", ")
 .append(" DECODE (SUBSTR (cc_nbr, 0, 1),''S'', ''folderClosed.gif'', NULL) AS \"im0\", ")
 .append(" DECODE (SUBSTR (cc_nbr, 0, 1),''S'', ''folderOpen.gif'',NULL) AS \"im1\", ")
 .append(" DECODE (SUBSTR (cc_nbr, 0, 1),''S'', ''folderClosed.gif'', NULL) AS \"im2\" ")
 .append(" ), ")
 .append(" XMLELEMENT (\"userdata\", ")
 .append(" xmlattributes (''itemType'' as \"name\" ), ")
 .append(" DECODE ( SUBSTR (cC_NBR, 0, 1),''S'',''PNODE'',''LNODE'') ")
 .append(" ) ) ")
 .append(" FROM tableName ")
 .append(" START WITH LTRIM (TRIM (cc_nbr), ''0'') = LTRIM (TRIM (''S531306''), ''0'') ")
 .append(" CONNECT BY NOCYCLE parent_cc_nbr = PRIOR cc_nbr' ")
 .append(" )")
 .append(" )")
 .append(" FROM DUAL)")
 .append(" ), VERSION '1.0\" encoding=\"iso-8859-1') xmldoc ")
 .append(" FROM DUAL");
 System.out.println(sql.toString());
 pst = connection.prepareStatement(sql.toString());
 rs = pst.executeQuery();
 while(rs.next()){
 System.out.println(rs.getString("xmldoc")); //here getting null
 }

Hi,
you can do this as below:
This example shows the use of getObject to directly get the XMLType from the ResultSet. This code snippet is the easiest way to get the XMLType from the ResultSet.
import oracle.xdb.XMLType;
PreparedStatement stmt = conn.prepareStatement(
"select e.poDoc from po_xml_tab e");
ResultSet rset = stmt.executeQuery();
while(rset.next())
// get the XMLType
XMLType poxml = (XMLType)rset.getObject(1);
// get the XML as a string...
String poString = poxml.getStringVal();
}

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