Problem with character set UTF-16 LE

Question

Hello.
There were difficulties with character set change, using function convert ()
The matter is that in the list v$nls_valid_values the character set AL16UTF16LE does not appear, during too time the inquiry is successfully carried out
convert ([some-national-characters], ' CL8MSWIN1251 ', ' AL16UTF16LE ').
But at giving on an input of the data stored in CLOB, there is an error "a character set is not supported"
What are possible ways of the decision of a problem?

Answer 1

You can try to use DBMS_LOB. SUBSTR to access LOB data like in the following example:
SQL> select * from v$version;
BANNER
Oracle Database 10g Express Edition Release 10.2.0.1.0 - Product
PL/SQL Release 10.2.0.1.0 - Production
CORE    10.2.0.1.0      Production
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
SQL>
SQL> declare
  2  v_i clob;
  3  v_o clob;
  4  begin
  5  v_i := 'a';
  6  v_o:=convert(dbms_lob.substr(v_i,1,1),'AL16UTF16LE', 'CL8MSWIN1251');
  7  end;
  8  /
PL/SQL procedure successfully completed.