Querying XML data in Object Relational tables

Question

Hi,
Can someone help me?
I have registered the purchaseorder.xsd in my database schema.
[ http://www.oracle.com/technology/oramag/oracle/03-jul/o43xml.html ]
declare
l_bfile bfile;
begin
l_bfile := bfilename(
'XMLSAMP', 'purchaseOrder.xsd');
dbms_lob.open(l_bfile);
dbms_xmlschema.registerschema('http://localhost:8080/purchaseOrder.xsd', l_bfile);
dbms_lob.close(l_bfile);
end;
This has created a table "PURCHASEORDER"
SYS_NC_ROWINFO$ SYS.XMLTYPE
It has also created object types.
select object_name from user_objects where object_type = 'TYPE' and object_name like 'XDBPO%'
XDBPO_ACTIONS_TYPE
XDBPO_ACTION_COLLECTION
XDBPO_ACTION_TYPE
XDBPO_LINEITEMS_TYPE
XDBPO_LINEITEM_TYPE
XDBPO_PART_TYPE
XDBPO_REJECTION_TYPE
XDBPO_SHIPINSTRUCTIONS_TYPE
XDBPO_TYPE
I have also inserted an xml into that table.
INSERT INTO "PURCHASEORDER"
VALUES
xmltype
getFileContent('ADAMS-20011127121040988PST.xml','XMLSAMP')
Now how do I retrieve the data from this table and the other object types?
Is extractvalue the only method? I have gone thru examples in the net but everything uses the element names in xml document and not the object type names.
For example to retreive the lineitem details, this query can be used
SELECT extractValue(value(d),'/Description')
FROM "PURCHASEORDER" p,
table (xmlsequence(extract(p.SYS_NC_ROWINFO$,'/PurchaseOrder/LineItems/LineItem/Description'))) d
But I want to retreive it from "XDBPO_LINEITEM_TYPE".
Is this possible?
Can someone help me please?
Thanks in advance.
Jay

Answer 1

#1. If you had taken the time to read some of the other posts in the forum all of the answers you needed were all there..
#2. As PM's we are not expected to spend a lot of time dealing with the forums. In general we are expected only to step in and answer the questions that are not easily answered by carefully reading existing posts or deal with cases were the wrong answer is supplied.
#3. I'm technically on vacation, and posted to that effect last week, so pushing for an answer is not at all appreciated...
#4. The problem is extremely simple, at least as stated in your simple example.
Given the schema.. Note It's been annotated
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xdb="http://xmlns.oracle.com/xdb" xdb:storeVarrayAsTable="true">
     <xs:element name="Bill">
          <xs:complexType>
               <xs:sequence>
                    <xs:element ref="InvCtlN"/>
                    <xs:element ref="MedBU"/>
                    <xs:element ref="Lineitem" maxOccurs="unbounded"/>
               </xs:sequence>
          </xs:complexType>
     </xs:element>
     <xs:element name="InvCtlN">
          <xs:simpleType>
               <xs:restriction base="xs:byte">
               </xs:restriction>
          </xs:simpleType>
     </xs:element>
     <xs:element name="LineCode">
          <xs:simpleType>
               <xs:restriction base="xs:int">
               </xs:restriction>
          </xs:simpleType>
     </xs:element>
     <xs:element name="Lineitem">
          <xs:complexType>
               <xs:sequence>
                    <xs:element ref="Type"/>
                    <xs:element ref="LineCode"/>
               </xs:sequence>
          </xs:complexType>
     </xs:element>
     <xs:element name="MedBU">
          <xs:simpleType>
               <xs:restriction base="xs:string">
               </xs:restriction>
          </xs:simpleType>
     </xs:element>
     <xs:element name="SampleFile" xdb:defaultTable="SAMPLE_FILE_TABLE">
          <xs:complexType>
               <xs:sequence>
                    <xs:element ref="Bill" maxOccurs="unbounded"/>
               </xs:sequence>
          </xs:complexType>
     </xs:element>
     <xs:element name="Type">
          <xs:simpleType>
               <xs:restriction base="xs:string">
               </xs:restriction>
          </xs:simpleType>
     </xs:element>
</xs:schema>and the following instance
<SampleFile xmlns:xdb="http://xmlns.oracle.com/xdb" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="testcase.xsd">
     <Bill>
          <InvCtlN>1</InvCtlN>
          <MedBU>ABC</MedBU>
          <Lineitem>
               <Type>P1</Type>
               <LineCode>99214</LineCode>
          </Lineitem>
     </Bill>
     <Bill>
          <InvCtlN>2</InvCtlN>
          <MedBU>DEF</MedBU>
          <Lineitem>
               <Type>P2</Type>
               <LineCode>99215</LineCode>
          </Lineitem>
          <Lineitem>
               <Type>P3</Type>
               <LineCode>99216</LineCode>
          </Lineitem>
     </Bill>
     <Bill>
          <InvCtlN>3</InvCtlN>
          <MedBU>HJK</MedBU>
          <Lineitem>
               <Type>P4</Type>
               <LineCode>99217</LineCode>
          </Lineitem>
     </Bill>
</SampleFile>The following appears to be what you are looking for
SQL*Plus: Release 10.2.0.2.0 - Production on Mon Feb 20 22:42:53 2006
Copyright (c) 1982, 2005, Oracle.  All Rights Reserved.
SQL> spool registerSchema_&4..log
SQL> set trimspool on
SQL> connect &1/&2
Connected.
SQL> --
SQL> declare
  2    result boolean;
  3  begin
  4    result := dbms_xdb.createResource('/home/&1/xsd/&4',
  5                                      bfilename(USER,'&4'),nls_charset_id('AL32UTF8'));
  6  end;
  7  /
old   4:   result := dbms_xdb.createResource('/home/&1/xsd/&4',
new   4:   result := dbms_xdb.createResource('/home/OTNTEST/xsd/testcase.xsd',
old   5:                                    bfilename(USER,'&4'),nls_charset_id('AL32UTF8'));
new   5:                                    bfilename(USER,'testcase.xsd'),nls_charset_id('AL32UTF8'));
PL/SQL procedure successfully completed.
SQL> commit
  2  /
Commit complete.
SQL> alter session set events='31098 trace name context forever'
  2  /
Session altered.
SQL> begin
  2    dbms_xmlschema.registerSchema
  3    (
  4      schemaURL => '&3',
  5      schemaDoc => xdbURIType('/home/&1/xsd/&4').getClob(),
  6      local     => TRUE,
  7      genTypes  => TRUE,
  8      genBean   => FALSE,
  9      genTables => &5
10    );
11  end;
12  /
old   4:     schemaURL => '&3',
new   4:     schemaURL => 'testcase.xsd',
old   5:     schemaDoc => xdbURIType('/home/&1/xsd/&4').getClob(),
new   5:     schemaDoc => xdbURIType('/home/OTNTEST/xsd/testcase.xsd').getClob(),
old   9:     genTables => &5
new   9:     genTables => TRUE
PL/SQL procedure successfully completed.
SQL> quit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL*Plus: Release 10.2.0.2.0 - Production on Mon Feb 20 22:42:55 2006
Copyright (c) 1982, 2005, Oracle.  All Rights Reserved.
SQL> spool insertFile_&3..log
SQL> set trimspool on
SQL> connect &1/&2
Connected.
SQL> --
SQL> set timing on
SQL> set long 10000
SQL> --
SQL> insert into &4 values (xmltype(bfilename(USER,'&3'),nls_charset_id('AL32UTF8')))
  2  /
old   1: insert into &4 values (xmltype(bfilename(USER,'&3'),nls_charset_id('AL32UTF8')))
new   1: insert into SAMPLE_FILE_TABLE values (xmltype(bfilename(USER,'testcase.xml'),nls_charset_id('AL32UTF8')
1 row created.
Elapsed: 00:00:00.06
SQL> commit
  2  /
Commit complete.
Elapsed: 00:00:00.00
SQL> quit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL*Plus: Release 10.2.0.2.0 - Production on Mon Feb 20 22:42:55 2006
Copyright (c) 1982, 2005, Oracle.  All Rights Reserved.
SQL> spool testcase.log
SQL> --
SQL> connect &1/&2
Connected.
SQL> --
SQL> --
SQL> -- Testcase code here
SQL> --
SQL> set trimspool on
SQL> set autotrace on explain
SQL> set timing on
SQL> set pages 10 lines 160 long 100000
SQL> --
SQL> column INVCTLN format  9999
SQL> column MEDBU   format  A10
SQL> column TYPE    format  A10
SQL> column LINECODE format 999999999
SQL> create or replace view MASTER_TABLE_VIEW
  2  (
  3     INVCTLN,
  4     MEDBU
  5  )
  6  as
  7  select extractValue(value(bill),'/Bill/InvCtlN'),
  8         extractValue(value(bill),'/Bill/MedBU')
  9    from SAMPLE_FILE_TABLE t,
10         table(xmlsequence(extract(value(t),'/SampleFile/Bill'))) Bill
11  /
View created.
Elapsed: 00:00:00.04
SQL> create or replace view DETAIL_TABLE_VIEW
  2  (
  3     INVCTLN,
  4     TYPE,
  5     LINECODE
  6  )
  7  as
  8  select extractValue(value(bill),'/Bill/InvCtlN'),
  9         extractValue(value(LineItem),'/Lineitem/Type'),
10         extractValue(value(LineItem),'/Lineitem/LineCode')
11    from SAMPLE_FILE_TABLE t,
12         table(xmlsequence(extract(value(t),'/SampleFile/Bill'))) Bill,
13         table(xmlsequence(extract(value(bill),'/Bill/Lineitem'))) LineItem
14  /
View created.
Elapsed: 00:00:00.05
SQL> set autotrace on explain
SQL> --
SQL> select * from MASTER_TABLE_VIEW
  2  /
INVCTLN MEDBU
      1 ABC
      2 DEF
      3 HJK
Elapsed: 00:00:00.05
Execution Plan
Plan hash value: 2362844891
| Id  | Operation          | Name               | Rows  | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT   |                    |     3 |  6165 |   805   (1)| 00:00:10 |
|   1 |  NESTED LOOPS      |                    |     3 |  6165 |   805   (1)| 00:00:10 |
|*  2 |   TABLE ACCESS FULL| SAMPLE_FILE_TABLE  |     1 |    30 |     3   (0)| 00:00:01 |
|*  3 |   INDEX RANGE SCAN | SYS_IOT_TOP_159053 |     3 |  6075 |     1   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   2 - filter(SYS_CHECKACL("ACLOID","OWNERID",xmltype('<privilege
              xmlns="http://xmlns.oracle.com/xdb/acl.xsd"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="http://xmlns.oracle.com/xdb/acl.xsd
              http://xmlns.oracle.com/xdb/acl.xsd DAV:http://xmlns.oracle.com/xdb/dav.xsd"><rea
              d-properties/><read-contents/></privilege>'))=1)
   3 - access("NESTED_TABLE_ID"="SAMPLE_FILE_TABLE"."SYS_NC0000800009$")
Note
   - dynamic sampling used for this statement
SQL> select * from DETAIL_TABLE_VIEW
  2  /
INVCTLN TYPE         LINECODE
      1 P1              99214
      3 P4              99217
      2 P2              99215
      2 P3              99216
Elapsed: 00:00:00.07
Execution Plan
Plan hash value: 971642473
| Id  | Operation               | Name               | Rows  | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT        |                    |     4 |  8352 |   813   (0)| 00:00:10 |
|   1 |  NESTED LOOPS           |                    |     4 |  8352 |   813   (0)| 00:00:10 |
|   2 |   MERGE JOIN CARTESIAN  |                    |     4 |  8220 |   805   (0)| 00:00:10 |
|*  3 |    TABLE ACCESS FULL    | SAMPLE_FILE_TABLE  |     1 |    30 |     3   (0)| 00:00:01 |
|   4 |    BUFFER SORT          |                    |     4 |  8100 |   802   (0)| 00:00:10 |
|   5 |     INDEX FAST FULL SCAN| SYS_IOT_TOP_159055 |     4 |  8100 |   802   (0)| 00:00:10 |
|*  6 |   INDEX UNIQUE SCAN     | SYS_IOT_TOP_159053 |     1 |    33 |     2   (0)| 00:00:01 |
|*  7 |    INDEX RANGE SCAN     | SYS_C0022871       |     1 |       |     0   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   3 - filter(SYS_CHECKACL("ACLOID","OWNERID",xmltype('<privilege
              xmlns="http://xmlns.oracle.com/xdb/acl.xsd"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="http://xmlns.oracle.com/xdb/acl.xsd
              http://xmlns.oracle.com/xdb/acl.xsd DAV:http://xmlns.oracle.com/xdb/dav.xsd"><read-pro
              perties/><read-contents/></privilege>'))=1)
   6 - access("NESTED_TABLE_ID"="SYS_NTh/v83GzKQ1evte63P5QRog=="."SYS_NC0000700008$")
       filter("NESTED_TABLE_ID"="SAMPLE_FILE_TABLE"."SYS_NC0000800009$")
   7 - access("NESTED_TABLE_ID"="SYS_NTh/v83GzKQ1evte63P5QRog=="."SYS_NC0000700008$")
Note
   - dynamic sampling used for this statement
SQL> quit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options
C:\xdb\otn\362337>