About Lob Locators

Question

Could any body of u help me to understand the functions done by LOB LOCATORS and how it is used to return the Actual value of LOB Columns, as i am unable to visualize even after reading the Documentation.
Thanks in advance
Rajan .

Answer 1

You can use a PL/SQL table of raw(32767) to transfer blob data to a remote site. Simply write a proc which reads blob into this table and pass it to remote proc which converts it back to blob.
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type vc_ary is table of raw(32767) index by binary_integer;
function lob_to_ary (loc in blob) return vc_ary
is
ary vc_ary;
pos integer := 1;
len integer := DBMS_LOB.getlength (loc);
begin
loop
ary(ary.count) := DBMS_LOB.substr (loc, 2000, pos);
pos := pos + 2000;
exit when pos > len;
end loop;
return ary;
end;
procedure ary_to_lob (loc in out nocopy blob, ary in vc_ary) is
begin
if ary.count > 0 then
for j in ary.first..ary.last loop
DBMS_LOB.writeappend (loc, length (ary(j)), ary(j));
end loop;
end if;
end;
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