ORA-22275 Invalid lob locator when using CLOB from a view

Question

Hi,
I am having problems when passing a CLOB from a "Union all" view to a function. I get an ORA-22275 error when trying to construct an XmlType from the CLOB and
the CLOB originates from a view. If the CLOB originates from a table, eveyting works fine. Here is the code, that reproduces the problem
CREATE TABLE testclob
    (field1                         CLOB)
-- insert some data
insert into testclob values ('<a/>');
-- Define a clob view over some tables
create or replace view v_testclob
(field1)
as
select field1 from testclob
union all
select field1 from testclob; -- in reallity I use different tables
-- Creat a functions that proceses the CLOB
CREATE OR REPLACE
function MyFunction(v_myClob clob) return VARCHAR2
IS
   myXML XMLTYPE;
BEGIN
  select xmltype(v_myClob) into myxml from dual; -- the view crashes ** HERE **
  -- code ommited
  return 'some data';
END;
-- Try to use the function:
-- Selecting from a table works OK
select myfunction(field1) from testclob;
-- Selecting from the view crashes
select myfunction(field1) from v_testclob;
Error: ORA-22275: invalid LOB locator specified ORA-22275: invalid LOB locator specified ORA-06512: at "D_TEST.MYFUNCTION", line 6
-- I using the following version:
select * from v$version;
-- Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production      
-- PL/SQL Release 9.2.0.1.0 - Production                           
-- CORE     9.2.0.1.0     Production                                       
-- TNS for 32-bit Windows: Version 9.2.0.1.0 - Production          
-- NLSRTL Version 9.2.0.1.0 - Production The only workaround I have found is to use substr
  select xmltype(dbms_lob.substr(v_myClob)) into myxml from dual; -- workaround.. but this mght trucnate my data.
What am I doing wrong?
Matej

Answer 1

You need to apply the latest patchset for your version of the database on your version of the operating system:
SQL> CREATE TABLE testclob
  2      (field1                         CLOB)
  3
SQL> /
Table created.
SQL>
SQL> -- insert some data
SQL> insert into testclob values ('<Data>Testing</Data>')
  2  /
1 row created.
SQL>
SQL> -- Define a clob view over some tables
SQL>
SQL> create or replace view v_testclob
  2  (field1)
  3  as
  4  select field1 from testclob
  5  union all
  6  select field1 from testclob
  7  /
View created.
SQL>
SQL> -- Creat a functions that proceses the CLOB
SQL>
SQL> CREATE OR REPLACE
  2  function MyFunction(v_myClob clob) return VARCHAR2
  3  IS
  4     myXML XMLTYPE;
  5  BEGIN
  6
  7    select xmltype(v_myClob) into myxml from dual; -- the view crashes ** HERE **
  8    -- code ommited
  9    return 'some data';
10  END;
11
12  /
Function created.
SQL> -- Try to use the function:
SQL> -- Selecting from a table works OK
SQL> select myfunction(field1) from testclob;
MYFUNCTION(FIELD1)
some data
SQL>
SQL>
SQL> -- Selecting from the view crashes
SQL> select myfunction(field1) from v_testclob;
MYFUNCTION(FIELD1)
some data
some data
SQL> disconnect
Disconnected from Oracle9i Enterprise Edition Release 9.2.0.7.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.7.0 - Production
SQL>