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Convert Oracle BLOB to XML Type

Oracle Database Tips by Donald BurlesonMarch 7, 2015

Question:  I need to Convert Data stored [ Blob Type ] column to [ XML TYPE ] column in a Table and extract the XML data from the XML TYPE column.  How do I convert a BLOB (CLOB) to an XML type?

Answer:  The two methods below to convert BLOB into XML types reply on the utl_raw.cast_to_varchar2 to make the conversion from a BLOB to an XML type:

 
declare
v_clob    CLOB;
v_varchar VARCHAR2(32767);
v_start   PLS_INTEGER := 1;
v_buffer  PLS_INTEGER := 32767;
blob_in   blob;
x         xmltype;
BEGIN
DBMS_LOB.CREATETEMPORARY(v_clob, TRUE);
 
 select col into blob_in from blob_xml where id = 1;
 
 FOR i 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;
 
 x := xmltype.createxml(v_clob);
 dbms_output.put_line(x.getclobval());
 
end;

Convert CLOB to XML:

If you first convert BLOB to CLOB you can use the following PL/SQL to convert a CLOB to an XML type.

The following PL/SQL stored procedure will accept a blob column as input and return an XML data type.  Here is yet another way to convert a CLOB to an XML string:

CREATE OR REPLACE FUNCTION blob_to_xmltype (blob_in IN BLOB)
RETURN XMLTYPE
AS
v_clob CLOB;
v_varchar VARCHAR2(32767);
v_start PLS_INTEGER := 1;
v_buffer PLS_INTEGER := 32767;
BEGIN
DBMS_LOB.CREATETEMPORARY(v_clob, TRUE);

FOR i 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 XMLTYPE(v_clob);
END blob_to_xmltype;
;

You can invoke this function as follows:

SELECT extract(blob_to_xmltype(my_column_name), '/tmp/xxx') FROM table_name;

You can also try this way to convert a BLOB to an XML type:

select
XMLType( blob_datatype_column,
         1 /* this is your character set ID. where 1 = USASCII */
       ) as XML
from my_table;

   
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