plsql - How convert CLOB to BLOB in Oracle? -


firstly converted blob of image clob, , converted clob blob. cannot see reconverted image. how can solve problem?

blob_to_clob function:

create or replace function blob_to_clob (blob_in in blob) return clob   v_clob clob;   v_varchar varchar2(32767);   v_start pls_integer := 1;   v_buffer pls_integer := 32767; begin   dbms_lob.createtemporary(v_clob, true);   in 1..ceil(dbms_lob.getlength(blob_in) / v_buffer)   loop     v_varchar := utl_raw.cast_to_varchar2(dbms_lob.substr(blob_in, v_buffer, v_start));     dbms_lob.writeappend(v_clob, length(v_varchar), v_varchar);     v_start := v_start + v_buffer;   end loop;   return v_clob; end blob_to_clob;

clob_to_blob function: 

create or replace function clob_to_blob2(p_clob in clob) return blob   v_blob blob;   v_offset number default 1;   v_amount number default 4096;   v_offsetwrite number default 1;   v_amountwrite number;   v_buffer varchar2(4096 char); begin dbms_lob.createtemporary(v_blob, true);   begin     loop       dbms_lob.read (lob_loc => p_clob,         amount  => v_amount,         offset  => v_offset,         buffer  => v_buffer);        v_amountwrite := utl_raw.length (r => utl_raw.cast_to_raw(c => v_buffer));        dbms_lob.write (lob_loc => v_blob,         amount  => v_amountwrite,         offset  => v_offsetwrite,         buffer  => utl_raw.cast_to_raw(v_buffer));        v_offsetwrite := v_offsetwrite + v_amountwrite;        v_offset := v_offset + v_amount;       v_amount := 4096;     end loop;   exception     when no_data_found     null;   end;   return v_blob; end clob_to_blob2;

code perform minimal recoding:

create or replace function clob2blob(aclob clob) return blob   result blob;   o1 integer;   o2 integer;   c integer;   w integer; begin   o1 := 1;   o2 := 1;   c := 0;   w := 0;   dbms_lob.createtemporary(result, true);   dbms_lob.converttoblob(result, aclob, length(aclob), o1, o2, 0, c, w);   return(result); end clob2blob; /

but clob can not contain image data without encoding base64


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