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Don Burleson Blog 







Change long raw datatype to character column

Oracle Database Tips by Donald BurlesonDecember 14, 2015

Question:  I have a long raw column within a table and I need to change the column datatype from long raw to varchar2.  How can I alter a long raw datatype to a character datatype?

Answer:  There are many methods changing a long raw to character values, but here is a test script that demonstrates a method.  The code is tricky because a long raw datatype is hexadecimal.

The script below takes the long raw and moves it into a new column.  At the end, you can alter the table to rename the columns to match the original name, if desired and drop the long raw column from the table.

set feedback off
set long 32767

drop table testtab;

create table
(col_key varchar2(10),
col_raw long raw);

-- *****************************************
-- Insert a character into a long raw column
insert into testtab values ('row 1', utl_raw.cast_to_raw('hello world'));

insert into testtab values ('row 2', utl_raw.cast_to_raw('hello moon'));

-- *****************************************
-- Because long raw is in hex, you have to
-- loop through it a byte at a time
-- ****************************************
a varchar(255);
b long raw;
c varchar(255);

cursor c1 is select col_key, col_raw from testtab;
open c1;
   fetch c1 into a, b;
   exit when c1%notfound;
end loop;

-- ***********************************************
-- Here we add a new column for the rato to text conversion
-- ***********************************************
alter table testtab add col_char varchar2(2000);

-- ***********************************************
-- We must create the insert column statement here
-- ***********************************************

spool runme.sql

-- *****************************************
-- Here we loop through each row in the table
-- ****************************************
a varchar(255);
b long raw;
c varchar(255);
z varchar(255);

cursor c1 is select col_key, col_raw from testtab;
open c1;
   fetch c1 into a, b;
   exit when c1%notfound;
   dbms_output.put_line('update testtab set col_char = '''||z||''' where col_key = '''||a||''';');
end loop;

spool off;


-- ******************************************
-- Now select the current table value
-- ******************************************

select * from testtab;

alter table testtab drop column col_raw;
-- ************************************
--  Remember to rebuild any indexes/constraints that
--  might exist on the above table column
-- ***************************************

alter table testtab rename col_char to col_raw;

-- ******************************************
-- As a final step you may want to reorganize
-- the table to clean-up fragmentation
-- ******************************************

create table testtab_new as select * from testtab;

truncate table testtab;

insert into testtab (select * from testtab_new)


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