DBMS_LOB

Examples

-- Obtain the length of the character string.
SELECT DBMS_LOB.GETLENGTH('12345678');

DECLARE
myraw  RAW(100);
amount INTEGER :=2;
buffer INTEGER :=1;
begin
DBMS_LOB.READ('123456789012345',amount,buffer,myraw);
dbms_output.put_line(myraw);
end;
/

CREATE TABLE blob_Table (t1 blob) DISTRIBUTE BY REPLICATION;
CREATE TABLE blob_Table_bak (t2 blob) DISTRIBUTE BY REPLICATION;
INSERT INTO blob_Table VALUES('abcdef');
INSERT INTO blob_Table_bak VALUES('22222');

DECLARE
str varchar2(100) := 'abcdef';
source raw(100);
dest blob;
copyto blob;
amount int;
PSV_SQL varchar2(100);
PSV_SQL1 varchar2(100);
a int :=1;
len int;
BEGIN
source := utl_raw.cast_to_raw(str);
amount := utl_raw.length(source);

PSV_SQL :='select * from blob_Table for update';
PSV_SQL1 := 'select * from blob_Table_bak for update';

EXECUTE IMMEDIATE PSV_SQL into dest;
EXECUTE IMMEDIATE PSV_SQL1 into copyto;

DBMS_LOB.WRITE(dest, amount, 1, source);
DBMS_LOB.WRITEAPPEND(dest, amount, source);

DBMS_LOB.ERASE(dest, a, 1);
DBMS_OUTPUT.PUT_LINE(a);
DBMS_LOB.COPY(copyto, dest, amount, 10, 1);
DBMS_LOB.CLOSE(dest);
RETURN;
END;
/

--Delete the table.
DROP TABLE blob_Table;
DROP TABLE blob_Table_bak;
last updated: 2024-12-11 14:09 UTC - commit: 68b0697a99ca2a4acec84bb31c0962598d3b4a14