How to handle the layout of file in OWB?

Question

Hi all,
I am facing one problem..that is
If my file is coming monthly
i need to load into datamart.
But the problem is the layout is not same.
At the end of the file one field may add or one field may delete..
The procedure I am following to load data into datamart is "First I am creating External table and then from Eaternal table to Table."
How can I handle this type of file in OWB
Pls give me some inputs
Thanks in advance
Srinivas

Answer 1

hi,
Define the extenal table in the followin way,
CREATE TABLE sample_extbl
2 ( col1 NUMBER
3 , col2 NUMBER
4 , col3 NUMBER
5 )
6 ORGANIZATION EXTERNAL
7 (
8 TYPE ORACLE_LOADER
9 DEFAULT DIRECTORY LOG_DIR
10 ACCESS PARAMETERS
11 (
12 RECORDS DELIMITED BY NEWLINE
13 nobadfile
14 nologfile
15 FIELDS TERMINATED BY ',' LDRTRIM
16 MISSING FIELD VALUES ARE NULL
17 )
18 LOCATION (LOG_DIR:'a.csv')
19 )
20 REJECT LIMIT UNLIMITED;
case 1:
Now, for example if the file a.csv contains the data as follows.
col1,col2,col3,col4,col5
abc,28,xyz,mno,1000
abc2,38,xyz,mno,2000
abc3,28,xyz,mno,3000
Then, if we query the external table "sample_extbl"
select * from sample_extbl
Then you get the data as follows
col1 col2 col3
abc 28 xyz
abc2 38 xyz
abc3 28 xyz
Case 2:
Now, for example if the file a.csv contains the data as follows.
col1,col2,col3,col4,col5
abc,28,xyz,mno,1000
abc2,38
abc3,28,xyz,mno
Then, if we query the external table "sample_extbl"
select * from sample_extbl
Then you get the data as follows
col1 col2 col3
abc 28 xyz
abc2 38
abc3 28 xyz
Regards,
Gowtham Sen.