SQL & PL/SQL

Hi,

We have a requirment..TO create a dynamic external table.. Whenever the data or number of columns change in the CSV file the table should be replaced with current data and current number of columns...as we are naive experienced people in oracle please give us a clear solution.. We have tried with a code already ..But getting some errors. Code given below..
thank you
we have executed this code by changing the schema name and table name ..Remaining everything same ...


Assume the following:
- Oracle User and Schema name is ALLEXPERTS
- Database name is EXPERTS
- The directory object is file_dir
- CSV file directory is /export/home/log
- The csv file name is ALLEXPERTS_CSV.log
- The table name is all_experts_tbl


1. Create a directory object in Oracle. The directory will point to the directory where the file located.
conn sys/{password}@EXPERTS as sysdba;
CREATE OR REPLACE DIRECTORY file_dir AS '/export/home/log';

2. Grant the directory privilege to the user
GRANT READ ON DIRECTORY file_dir TO ALLEXPERTS;

3. Create the table
Connect as ALLEXPERTS user

create table ALLEXPERTS.all_experts_tbl
(txt_line varchar2(512))
organization external
(type ORACLE_LOADER
default directory file_dir
access parameters (records delimited by newline
fields
(txt_line char(512)))
location ('ALLEXPERTS_CSV.log')
);

This will create a table that links the data to a file. Now you can treat this file as a regular table where you can use SELECT statement to retrieve the data.

****************************************
PL/SQL to create the data (PSEUDO code)
****************************************
CREATE OR REPLACE PROCEDURE new_proc IS

-- Setup the cursor
CURSOR c_main IS SELECT *
FROM allexperts.all_experts_tbl;

CURSOR c_first_row IS ALLEXPERTS_CSV.logSELECT *
FROM allexperts.all_experts_tbl
WHERE ROWNUM = 1;

-- Declare Variable
l_delimiter_count NUMBER;
l_temp_counter NUMBER:=1;
l_current_row VARCHAR2(100);
l_create_statements VARCHAR2(1000);

BEGIN

-- Get the first row
-- Open the c_first_row and fetch the data into l_current_row
-- Count the number of delimiter l_current_row and set the l_delimiter_count
OPEN c_first_row;
FETCH c_first_row INTO l_current_row;
CLOSE c_first_row;

l_delimiter_count := number of delimiter in l_current_row;

-- Create the table with the right number of columns
l_create_statements := 'CREATE TABLE csv_table ( ';

WHILE l_temp_counter <= l_delimiter_count
LOOP

l_create_statement := l_create_statement || 'COL' || l_temp_counter || ' VARCHAR2(100)'

l_temp_counter := l_temp_counter + 1;

IF l_temp_counter <=l_delimiter_count THEN
l_create_statement := l_create_statement || ',';
END IF;


END;

l_create_statement := l_create_statement || ')';

EXECUTE IMMEDIATE l_create_statement;

-- Open the c_main to parse all the rows and insert into the table
WHILE rec IN c_main
LOOP

-- Loop thru all the records and parse them
...
...
...

-- Insert the data into the table created above
...
...
..

END LOOP;