How to load xml with large base64 element using sqlldr

Question

Hi,
I am trying to load xml data onto Oracle 10gR2. I want to use standard sqlldr tool if possible.
1) I have registered my schema with succes:
- Put the 6kbytes schema into a table
- and
DECLARE
schema_txt CLOB;
BEGIN
SELECT text INTO schema_txt FROM schemas;
DBMS_XMLSCHEMA.registerschema ('uddkort.xsd', schema_txt);
END;
- Succes: I can create table like:
CREATE TABLE XmlTest OF XMLTYPE
XMLSCHEMA "uddkort.xsd"
ELEMENT "profil"
- USER_XML_TABLES shows:
TABLE_NAME,XMLSCHEMA,SCHEMA_OWNER,ELEMENT_NAME,STORAGE_TYPE
"XMLTEST","uddkort.xsd","THISE","profil","OBJECT-RELATIONAL"
2) How can I load XML data into this?
- One element of the schema is <xs:element name="billede" type="xs:base64Binary" minOccurs="0"/>
- This field in data can be 10kbytes or more
I have tried many control files - searching the net, but no luck so far.
Any suggestions?
/Claus, DK

Answer 1

- One element of the schema is <xs:element name="billede" type="xs:base64Binary" minOccurs="0"/>
- This field in data can be 10kbytes or moreThe default mapping in Oracle for this type is RAW(2000), so not sufficient to hold 10kB+ of data.
You'll have to annotate the schema in order to specify a mapping to BLOB datatype.
Something along those lines :
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xdb="http://xmlns.oracle.com/xdb">
<xs:element name="image" xdb:defaultTable="IMAGES_TABLE">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="name" type="xs:string"/>
      <xs:element name="content" type="xs:base64Binary" xdb:SQLType="BLOB"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>
</xs:schema>http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14259/xdb05sto.htm#sthref831
Then :
SQL> begin
  2   dbms_xmlschema.registerSchema(
  3   schemaURL => 'image.xsd',
  4   schemaDoc => '<?xml version="1.0"?>
  5  <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xdb="http://xmlns.oracle.com/xdb">
  6  <xs:element name="image" xdb:defaultTable="IMAGES_TABLE">
  7    <xs:complexType>
  8      <xs:sequence>
  9        <xs:element name="name" type="xs:string"/>
10        <xs:element name="content" type="xs:base64Binary" xdb:SQLType="BLOB"/>
11      </xs:sequence>
12    </xs:complexType>
13  </xs:element>
14  </xs:schema>',
15   local => true,
16   genTypes => true,
17   genTables => true,
18   enableHierarchy => dbms_xmlschema.ENABLE_HIERARCHY_NONE
19   );
20  end;
21  /
PL/SQL procedure successfully completed
SQL> insert into images_table
  2  values(
  3    xmltype(bfilename('TEST_DIR', 'sample-b64.xml'), nls_charset_id('AL32UTF8'))
  4  );
1 row inserted
where "sample-b64.xml" looks like :
<?xml version="1.0" encoding="UTF-8"?>
<image>
<name>Collines.jpg</name>
<content>/9j/4AAQSkZJRgABAgEBLAEsAAD/7QlMUGhvdG9zaG9wIDMuMAA4QklNA+0KUmVzb2x1dGlvbgAA
AAAQASwAAAABAAEBLAAAAAEAAThCSU0EDRhGWCBHbG9iYWwgTGlnaHRpbmcgQW5nbGUAAAAABAAA
AHg4QklNBBkSRlggR2xvYmFsIEFsdGl0dWRlAAAAAAQAAAAeOEJJTQPzC1ByaW50IEZsYWdzAAAA
O9r8FHXdH4LDSSUHoImAmcIcQPwWAkkh3ogKI404WGkkkO8Po/EpmmCYWEkkru7z/FJg9sRqsFJJ
XR3iPZMJN1HmsFJJXT6u+3UQdJUJj7lhpJKHV32dh96i3Qx8lhJJK7u9w4jw7p+SCsBJJDukQ7Tu
VM6Ln0klHo7rjEeak0rASST0f//Z</content>
</image>BTW, open question to everyone...
XMLTable or XMLQuery don't seem to work to extract the data as BLOB :
SQL> select x.image
  2  from images_table t
  3     , xmltable('/image' passing t.object_value
  4         columns image blob path 'content'
  5       ) x
  6  ;
ERROR:
ORA-01486: size of array element is too large
no rows selectedhowever this is OK :
SQL> select extractvalue(t.object_value, '/image/content') from images_table t;
EXTRACTVALUE(T.OBJECT_VALUE,'/IMAGE/CONTENT')
FFD8FFE000104A46494600010201012C012C0000FFED094C50686F746F73686F7020332E30003842
494D03ED0A5265736F6C7574696F6E0000000010012C000000010001012C0000000100013842494DIs there a known restriction when dealing with LOB types?
Edited by: odie_63 on 17 nov. 2011 19:27