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Loading LOB (BLOB) data into tables

Oracle Database Tips by Donald Burleson

QUESTION:  I want to load some LOB data types (BLOBs) into an Oracle table.  What are my table definitions and data loading options?


To load external LOB data into internal LOB storage using PL/SQL alone you must first use a table containing BFILE locators for the files to allow Oracle to access them.

create table
  bfile_id     number,
  bfile_desc   varchar2(30),
  bfile_loc    bfile,
  bfile_type   varchar2(4)
  (initial 1m next 1m pctincrease 0);

Notice in the above code that no LOB storage clause is specified. This is because all that is stored in the database is a locator value for the BFILE consisting of an internal DIRECTORY specification and a file name. The BFILE locators are loaded into the table using the BFILENAME function and a standard insert statement.

An example of this process is shown here:

SQL> INSERT INTO graphics_table
  2  VALUES(4,'April Book of Days Woodcut',bfilename('GIF_FILES','APRIL.JPG'),'JPEG');
1 row created.
SQL> INSERT INTO graphics_table
  2  VALUES(8,'August Book of Days Woodcut',bfilename('GIF_FILES','AUGUST.JPG'),'JPEG');
1 row created.
SQL> INSERT INTO graphics_table
  2  VALUES(13,'Benzene Molecule',bfilename('GIF_FILES','BENZNE.GIF'),'GIF');
1 row created.

My other notes on loading LOB data includes:

LOB Types and REF Cursors with Oracle Perl DBI



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