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Oracle 10g Unloading BFILE datatypes

8 ELSE
9 DBMS_LOB.FILEGETNAME (bf, dir_alias, file_name);
10 RETURN file_name;
11 END IF;
12 END;
13 /
Function created.

  1. Next, add a row with a NULL value for the BFILE column in your source table as follows:

SQL> INSERT INTO PRINT_MEDIA (product_id, ad_id, ad_graphic)
2 VALUES (3515, 12001, NULL);

1 row created.

Now, use the newly created functions to populate the external table. The functions must be created to set the external columns ad_graphic_dir and ad_graphic_file to NULL when the BFILE column is NULL.

  1. Next, create an external table to contain the data from the print_media table. We will use the get_dir_name and get_file_name functions to retrieve the components from the BFILE column.

SQL> CREATE TABLE print_media_xt
2 ORGANIZATION EXTERNAL
3 (
4 TYPE oracle_datapump
5 DEFAULT DIRECTORY def_dir1
6 LOCATION ('pm_xt.dmp')
7 ) AS
8 SELECT product_id, ad_id,
9 get_dir_name (ad_graphic) ad_graphic_dir,
10 get_file_name(ad_graphic) ad_graphic_file
11 FROM print_media;
Table created.

  1. To reverse this process and load the BFILE, we must create a function to load a BFILE column from the data that we placed in the external table. This function must return NULL if the ad_graphic_dir column in the external table is NULL.

SQL> CREATE FUNCTION get_bfile (dir VARCHAR2, file VARCHAR2) RETURN
BFILE is
2 bf BFILE;
3 BEGIN
4 IF dir IS NULL
5 THEN
6 RETURN NULL;
7 ELSE


Get the complete story:

The above text is an excerpt from "Oracle Database 10g New Features: Reference for Advanced Tuning and Administration", by Rampant TechPress.  Written by top Oracle experts, this book has a complete online code deport with ready to use scripts. 

To get the code instantly, click here:

http://rampant-books.com/book_2003_2_oracle10g.htm


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