Retrieving BLOBs via stored procedure

Question

Hi all,
I'm trying to retrieve bigger blobs (>1 MB) from a database using a stored procedure, but it didn't work. I can't figure out were the problem is.
My stored prcedure looks like:
CREATE OR REPLACE PROCEDURE get_blobs (blob_id IN NUMBER, v_enterid out NUMBER, v_enterdate_s out VARCHAR2, v_name out VARCHAR2, BUFFER_CHARS out LONG, v_blob_size out NUMBER) IS
v_enterdate DATE;
v_content BLOB;
BUFFER LONG RAW;
AMOUNT BINARY_INTEGER := 100;
POS INTEGER := 1;
COUNTER INTEGER :=0;
BEGIN
SELECT EntryID,EnterDate,Name,Content
INTO v_enterid,v_enterdate,v_name,v_content
FROM test_blob WHERE EntryID=blob_id;
v_enterdate_s := to_char(v_enterdate,'dd.mm.yyyy');
v_blob_size := DBMS_LOB.GETLENGTH(v_content);
AMOUNT := cast(v_blob_size as BINARY_INTEGER);
DBMS_LOB.READ (v_content, AMOUNT, POS, BUFFER);
BUFFER_CHARS := 'aaaaa';
CAST_TO_VARCHAR2(BUFFER);
BUFFER2 := BUFFER2 || BUFFER_CHARS;
RETURN;
END;
I think there are several mistakes in this code, as I tried and tried many days.
When I execute the code using a sql script, it works (the output is just removed for testing), but if I try it with an PHP script I get the following error:
Warning: Ora_Exec failed (ORA-21560: argument 2 is null, invalid, or out of range ORA-06512: at "SYS.DBMS_LOB", line 640 ORA-06512: at "JAN.GET_BLOBS", line 21 ORA-06512: at line 1 -- while processing OCI function OEXEC/OEXN) in d:\eclipse\crf tracker\modules\manage\new.inc.php on line 60
The PHP routine looks like:
$v_index_in = 1;
$cursor = ora_open($conn);
$query = "BEGIN GET_BLOBS(:v_index_in,:v_index,:v_enterdate,:v_name,:v_content,:v_size); END;";
$stmt = ora_parse($cursor,$query);
ora_bind ($cursor, "v_index_in", ":v_index_in", 10,1);
ora_bind ($cursor, "v_index", ":v_index", 10,2);
ora_bind ($cursor, "v_enterdate", ":v_enterdate", 20,2);
ora_bind ($cursor, "v_name", ":v_name", 100,2);
ora_bind ($cursor, "v_size", ":v_size", 10000, 2);
ora_bind ($cursor, "v_content", ":v_content",$v_size,2);
$v_index = '';
$v_enterdate = '';
$v_name = '';
$v_content = '';
$v_size = '';
ora_exec($cursor,$stmt);
Could please anybody helps me with that problem. I really see no chance to solve it on my own, because I'm just starting to work with Oracle, but I have to finish this in two weeks.
It doesn't matter, if the output of the content will be a blob or whatever else, because the processing in PHP will not be a big problem.
Thanks a lot in advance,
best regards,
Jan.

Answer 1

Hi
You can use ref cursor to return the results from your stored procedure. Here is how you define .
CREATE OR REPLACE PACKAGE trial AS
TYPE m_refcur IS REF CURSOR;
END trial;
Create or replace procedure example ( var1 out trial.m_refCur, var2 out trial.m_refCur)
as
open var1 for select * from emp;
open var2 for select * from dept;
end;
You can call this stored procedure in Java using Callable Statement. I you are using C++ or VB you can use OLEDB or
ADO API's to call same stored procedure.
Hope this helps
Chandar