Tag Archives: blob

Oracle

Load File into Database as Blob

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You can find lots of procedure or steps to load file from filesystem to database.
one of the easy method is to make a function.
Sample of function:-
CREATE OR REPLACE FUNCTION FN_FILE_BLOB(V_FILENAME VARCHAR2, V_DIRECTORY VARCHAR2) RETURN BLOB
IS
src_loc BFILE;
dest_loc BLOB:=empty_blob();
BEGIN
SRC_LOC := BFILENAME(V_DIRECTORY, V_FILENAME);
DBMS_LOB.OPEN(src_loc, DBMS_LOB.LOB_READONLY);
DBMS_LOB.CREATETEMPORARY(lob_loc => dest_loc, cache => true , dur => dbms_lob.session);
DBMS_LOB.OPEN(dest_loc, DBMS_LOB.LOB_READWRITE);
DBMS_LOB.LOADFROMFILE(dest_lob => dest_loc, src_lob => src_loc , amount => DBMS_LOB.getLength(src_loc));
DBMS_LOB.CLOSE(src_loc);
DBMS_LOB.CLOSE(dest_loc);
RETURN dest_loc;
EXCEPTION
WHEN Others THEN
Dbms_Output.Put_Line(SQLERRM);
RETURN NULL;
END;
/

Usage: SELECT FN_FILE_BLOB('image1.jpg','DUMP_DIR') FROM DUAL;

Oracle

Convert Blob into Insert Statment

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There are many ways to copy Blob column from one server to Another like,

1. Generate file from blob in source server, and import file into destination server using Tools like SQL developer, TOAD.

2. Using DBLink,
INSERT INTO BLOB_TEST SELECT BLOB_COL1 FROM TEST_BLOB@SOURCEDB;
3.  I have recently discovered, you can make dynamic insert statement and run as normal insert statement in destination server.

Example here: sample_blob

Scripts to make dynamic script can be written as

Set serveroutput on
DECLARE
M BLOB;
n NUMBER:=1;
c blob;
l_limit NUMBER:=4000;
vm RAW(32767);
BEGIN
Dbms_Output.Put_Line('DECLARE
c BLOB;
BEGIN
dbms_lob.createtemporary(c,true);');
SELECT  BLOB_COL INTO M FROM TEST_BLOB;
--Dbms_Output.Put_Line(Length(M));
while (n+l_limit<=length(m)) loop
     vm:=(dbms_lob.substr(M,l_limit,n));
     Dbms_Output.Put_Line('dbms_lob.writeappend(c,'||Length(vm)/2||','''||VM||''');');
     n:=n+l_limit;
END LOOP;
vm:=(dbms_lob.substr(M,length(m)-n+999,n));
Dbms_Output.Put_Line('dbms_lob.writeappend(c,'||Length(vm)/2||','''||VM||''');');
Dbms_Output.Put_Line('INSERT INTO blob_test VALUES (c,9);
END;
/');
END;
/

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