XMLType and Constraints.

Hi,
I have created a table with XMLType column. This XMLType column holds data adhering to the XMP schema http://xmlns.oracle.com/ord/meta/xmp. XMLType column stores metadata for different entites which are differentiated by their entity type. These entities could have relationships also. What would be the best approach to define the relationships?
For example, the data could be as follows:
Row1--> id=1, type=1, xmpMeta={RDF document with properties for ClassA }
Row2--> id=1, type=2, xmpMeta={RDF document with properties for ClassB }
Relationships (1:1 or 1:M ) could exist between ObjectA and ObjectB. Eventhough the XMLType holds the RDF data, how do we maintain the the relationship? How can we retrieve data based on those relationships?
Sample data stored in XMLTYpe column is :
<xmpMetadata xmlns="http://xmlns.oracle.com/ord/meta/xmp"
xsi:schemaLocation="http://xmlns.oracle.com/ord/meta/xmp
http://xmlns.oracle.com/ord/meta/xmp"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description xmlns:dc="http://purl.org/dc/elements/1.1/">
<dc:title>Test1</dc:title>
<dc:something></dc:something>
</rdf:Description>
</rdf:RDF>
</xmpMetadata>
Regards
Raji

You should create a schema based XMLType object using createSchemaBasedXML(), then validate it with schemaValidate()
http://download-west.oracle.com/docs/cd/B10501_01/appdev.920/a96616/arxml24.htm#1014214
http://download-west.oracle.com/docs/cd/B10501_01/appdev.920/a96616/arxml24.htm#1014272
Also you may use XMLType's constructor to define a XSD, whether it must be validated and must be well formed.
There lots of ways for storing, managing and developing with XML in oracle. java, c, pl/sql or xml/sql.
Best Regards
Erturk

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Indices and constraints on XML Tables/Columns (with Schema)

Hi,
I've read a lot of documents by know, but the more I read the more I got confused. So I hope you can help me.
Frist my Oracle Server Version: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit
I've manages to create a table with a column with the type SYS.XMLTYPE and the storage modle "Object Relational" with an XML Schema.
I can insert data and I can execute XQuery statements.
I can also create an XMLTYPE table with my Schema, althoug the tool SQL Developer keeps telling me, that the one column wich is generated within the table is of the type CLOB instead of object realtional (which is what I defined).
The query for that is:
CREATE TABLE ENTRY_XML OF XMLTYPE
XMLTYPE STORE AS OBJECT RELATIONAL
XMLSCHEMA "BBMRI_Entry.xsd" ELEMENT "Entry";
That's where I am, now my questions:
1. What's the difference? I'm aware of the obviouse difference, that with the first way I can add relational columns as well, but apart from that? If I only want to store the xml data, is the second approach always better (especially in regard to my next question)?
2. My schema contains elements with attributes (which contain IDs), which have to be unique. So I tried to add a UNIQUE constraint, but failed. I found this (http://www.oracle.com/technology/sample_code/tech/java/codesnippet/xmldb/constraints/Specify_Constraints.html), but it just doesn't work.
Query: "ALTER TABLE ENTRY_XML CONSTRAINT ENTRY_XML_SUBID_UNQIUE UNIQUE (xmldata."SubId");"
Error: "ORA-01735: invalid ALTER TABLE option"
3. I didn't try yet, but I need to specifiy foreign keys within the XML as well (which is explained in the link at question 2). I guess the solution to question 2 will make this possible as well.
4. Since I can create a UNIQUE constaint for attributes (well, I can't yet, but I hope that this will change soon) I woundered if it would be possible to realize something like auto_increment. Although I see the problem with validating the xml input if the Ids are empty. Any suggestions on that problem? Do I have to query for the highest (free) id before I can insert the new documents?
Well, that's enough for today, I hope someone can help me!
Greetings, Florian

I've read through all the literature (again) and found out, that I did most of the stuff right in the first place. I just missinterpreted the generated tables for the types and wondered why they only contained one column. Well, at least one mistery solved.
But know to make it easier just one question, which might solve all problems I have:
How can I create UNIQUE constraints and FOREIGN KEYS when I have a table or column of the type XmlType with a schema using the object relational storage method?
I found a solution http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14259/xdb05sto.htm#i1042421 (Example 5-12), but it just does not work for me.
I removed the FOREIGN KEY and tried it again and the UNIQUE Key works.
So basically the question is how to retrieve the "AId" Attribute. "XMLDATA"."AId", "XMLDATA"."Attribute"."AId" and "XMLDATA"."Subject"."Attribute"."AId" all do not work.
I've added my schema declarations at the bottom (which I've already successfully registred and used without foreign keys and constraints, so they work).
After I've registered the two schema files 3 types and 11 tables where created. One type for the attribute, one for the study type and one probably to link the attributes to the study types. The tables are one for the attribute, 4 for the content*-elements, 2 for the study type (I don't really know why two) and 4 with strange names starting with "SYS_NT" and then some random numbers and letters (looks alot like some base64 encoded string).
The Query I try to use to create the table is: (The table "Attribute" already exists and contains a field "ID", which is it's PK.)
CREATE TABLE STUDYTYPE_XML
OF XMLType (UNIQUE ("XMLDATA"."STId"),
FOREIGN KEY ("XMLDATA"."AId") REFERENCES ATTRIBUTE(ID))
XMLTYPE STORE AS OBJECT RELATIONAL
ELEMENT "StudyType.xsd#StudyType";
The error I get is:
Error starting at line 1 in command:
CREATE TABLE STUDYTYPE_XML
OF XMLType (UNIQUE ("XMLDATA"."STId"),
FOREIGN KEY ("XMLDATA"."AId") REFERENCES ATTRIBUTE(ID))
ELEMENT "StudyType.xsd#StudyType"
Error at Command Line:3 Column:37
Error report:
SQL Error: ORA-22809: nonexistent attribute
22809. 00000 - "nonexistent attribute"
Cause: An attempt was made to access a non-existent attribute of an
object type.
Action: Check the attribute reference to see if it is valid. Then retry
the operation.
Attribute-Schema (Attribute.xsd):
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
     <xs:attribute name="AId">
          <xs:simpleType>
               <xs:restriction base="xs:integer">
                    <xs:minInclusive value="0" />
               </xs:restriction>
          </xs:simpleType>
     </xs:attribute>
     <xs:attribute name="Name" type="xs:string" />
     <xs:element name="ContentString" type="xs:string" />
     <xs:element name="ContentInteger" type="xs:integer" />
     <xs:element name="ContentDouble" type="xs:decimal" />
     <xs:element name="ContentDate" type="xs:date" />
     <xs:element name="Attribute">
          <xs:complexType>
               <xs:choice minOccurs="0" maxOccurs="1">
                    <xs:element ref="ContentString" />
                    <xs:element ref="ContentInteger" />
                    <xs:element ref="ContentDouble" />
                    <xs:element ref="ContentDate" />
               </xs:choice>
               <xs:attribute ref="AId" use="required" />
               <xs:attribute ref="Name" use="optional" />
          </xs:complexType>
     </xs:element>
</xs:schema>
Study Type Schema (StudyType.xsd):
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
     <xs:include schemaLocation="Attribute.xsd" />
     <xs:attribute name="STId">
          <xs:simpleType>
               <xs:restriction base="xs:integer">
                    <xs:minInclusive value="0" />
               </xs:restriction>
          </xs:simpleType>
     </xs:attribute>
     <xs:element name="StudyType">
          <xs:complexType>
               <xs:sequence>
                    <xs:element ref="Attribute" minOccurs="1" maxOccurs="unbounded" />
                    <xs:element ref="StudyType" minOccurs="0" maxOccurs="unbounded" />
               </xs:sequence>
               <xs:attribute ref="STId" use="required"/>
          </xs:complexType>
     </xs:element>
</xs:schema>
Edited by: alwaysspam on Sep 8, 2010 5:35 PM

What are the differences between trigger and constraints?

what are the differences between trigger and constraints?

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How to extract all keys (PK, FK) and constraints from the schema?

hi,
How to extract all keys (PK, FK) and constraints from the schema?Thanks!

I have no idea about any tool which only extract the DDL of constraints.
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www.databee.com

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Thanks for your reply but i want to create a script to load all the objects once, but split into diff tablespaces..
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but it doesn't work....
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Xmltype and payload_factory

Hello,
I hope someone can help. Thanks
I am trying to dequeue a XMLType msg.
I am not having any luck, not much support that i could find on the web.
I get the following error
oracle.jms.AQjmsException: JMS-137: Payload factory must be specified for destinations with ADT payloads
the erros accurs at the following line
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For a custom sqldata type I do the following:
I have a class that implemtns couple interface
CBMessageDat implements CustomDatum, CustomDatumFactory
then i do the following:
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This is what I needed to do
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XMLType and Oracle JMS compatibility

We need to receive messages from a Oracle-AQ queue with paylod_type XMLType,
and we would like manage this with JMS and MDB using OC4J 10.1.3.
Somebody know if is it possible to map such a queue as a JMS source or are there
limitations to the specific SYS.AQ$_JMS_MESSAGE paylod_type?
In the second case, what kind of workaround can we put in place? The XMLType is
a must in our environment, so we have to manage it in some way...
Thanks,
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We need to receive messages from a Oracle-AQ queue with paylod_type XMLType,
and we would like manage this with JMS and MDB using OC4J 10.1.3.
Somebody know if is it possible to map such a queue as a JMS source or are there
limitations to the specific SYS.AQ$_JMS_MESSAGE paylod_type?
In the second case, what kind of workaround can we put in place? The XMLType is
a must in our environment, so we have to manage it in some way...
Thanks,
Giorgio.

Xmltype and validarion with xsd.

Hi,
How can I create a relation between a column (xmltype) and a xml schema (file.xsd) ?
Thanks.

You should create a schema based XMLType object using createSchemaBasedXML(), then validate it with schemaValidate()
http://download-west.oracle.com/docs/cd/B10501_01/appdev.920/a96616/arxml24.htm#1014214
http://download-west.oracle.com/docs/cd/B10501_01/appdev.920/a96616/arxml24.htm#1014272
Also you may use XMLType's constructor to define a XSD, whether it must be validated and must be well formed.
There lots of ways for storing, managing and developing with XML in oracle. java, c, pl/sql or xml/sql.
Best Regards
Erturk

DM 3.0 Production: How to get only indexes and constraints to DDL?

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I'd like to have a DDL file that contains all of the indexes and constraints of my model. From DDL Generation Option I only check all PK and UK constraints and all indexes and leave everything else unchecked. The DDL that I get is empty...

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Table:
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CONSTRAINT TESTID_PK PRIMARY KEY(TESTID))
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ELEMENT "Metadata";
There seems to be no problem materializing data into a generated class:
orset = (OracleResultSet)stmt.executeQuery("select x.FILENAME, x.TESTDOC.xmldata from TEST_XML_TAB x");
Metadata meta = (Metadata)orset.getORAData(2, Metadata.getORADataFactory());
But I can't find an easy way to make an insert or update!
Any Help?
Thanks!

OK, I tried building an object view around the table:
CREATE TYPE TEST_XML_TAB_TYPE AS OBJECT (
     TESTID           NUMBER(10),
     FILENAME      CHAR(127),
     TESTDOC DD."Metadata_T"
CREATE VIEW TEST_XML_TAB_VIEW OF TEST_XML_TAB_TYPE
WITH OBJECT IDENTIFIER (TESTID) AS
SELECT e.TESTID, e.FILENAME, e.TESTDOC.xmldata
FROM TEST_XML_TAB e;
Then the following works fine:
opstmt = (OraclePreparedStatement) conn.prepareStatement(
"insert into TEST_XML_TAB_VIEW (TESTID, FILENAME, TESTDOC) values(?,?,?)");
opstmt.setORAData(3, meta);
Using SQL*Plus Worksheet the statement
SELECT TESTDOC FROM TEST_XML_TAB;
shows all inserted data sets.
But selecting the data sets by using Java and XMLType the inserted data sets couldn't be streamed out.
Which information is lost when inserting as described above?
Any Help?
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Primary keys and constraints are gone....

Hi Experts,
I had a schema SchemaD with all primary keys and referential constraints. And i am a TOAD user. I had one more source schema SchemaS.
In my destination schema all the tables has 2 extra columns for data warehouse purpose.
I disabled all the constraints and i used toad utility "Copy Data to Another Schema" and i selected all the tables from Source SchemaS.
After the completion of data copy i tried to enable all the constraints in SchemaD. But i found that there are no primary keys and referential integrates in that schema.
Please help me in this issue.
Thanks...
Ray

Check in the views "DBA_CONSTRAINTS" or ALL_CONSTRAINTS" with the condition owner='your_schema_name'
If you are using toad to view the constraints, chances are high that there is a filter in the toad view and it is filtering the constraints...
Edited by: Suchit on Feb 25, 2009 5:19 PM
Edited by: Suchit on Feb 25, 2009 5:20 PM

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SET PAGESIZE 150
SET FEEDBACK OFF
SET VERIFY OFF
COLUMN "COLUMN NAME" FORMAT A50
COLUMN "DATA TYPE" FORMAT A15
COLUMN "IS NULL" FORMAT A15
COLUMN CONSTRAINTS FORMAT A15
PROMPT Enter table name:
ACCEPT TABNAME
SET MARK HTML ON
SPOOL STRUCTURE.html
PROMPT &TABNAME
-- Query ---
SELECT TRIM(A.COLUMN_NAME) AS "COLUMN NAME",
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FROM USER_TAB_COLS A,
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A.TABLE_NAME = B.TABLE_NAME(+) AND
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Hi,
For Head Count you can use 0HR_PA_0 datasource and the other Employee details like start date and end date you can get them from employee master data and FTE can be calculated from the Emloyee Master Data and Head count data.
Hope this helps...
Thanks,

Problems with XMLType and namespace

Dear subscribers:
I have been using XMLType successfully with simple XMLs - without namespaces. Now I must handle messages with "xmlns" and it seems XMLType is failing.
I tested the following XML, extracted from w3c.org examples:
<?xml version="1.0"?>
<bk:book xmlns:bk=''urn:loc.gov:books''
xmlns:isbn=''urn:ISBN:0-395-36341-6''>
<bk:title>Cheaper by the Dozen</bk:title>
<isbn:number>1568491379</isbn:number>
</bk:book>
The result of xmlt.getRootElement() is book.
However, the use of xmlt.extract( 'book' ) returns an empty object:
xmlt1 := xmlt.extract( 'book' );
dbms_output.put_line( 'StringVal: ' || xmlt1.getStringVal() );
ORA-30625: method dispatch on NULL SELF argument is disallowed
The following usages also raise errors:
xmlt1 := xmlt.extract( 'bk:book' );
ORA-31011: XML parsing failed ORA-19202: Error occurred in XML processing LPX-00601: Invalid token in: 'bk:book' ORA-06512: at "SYS.XMLTYPE", line 111
xmlt1 := xmlt.extract( 'bk::book' );
ORA-31011: XML parsing failed ORA-19202: Error occurred in XML processing LPX-00601: Invalid token in: 'bk::book' ORA-06512: at "SYS.XMLTYPE", line 111
xmlt1 := xmlt.extract( 'book', 'bk' );
ORA-31013: Invalid XPATH expression ORA-06512: at "SYS.XMLTYPE", line 119
I am using Oracle version 10.2.0.1.0. Had someone also faced this problem?
The code I used to test is at the end of this message.
Thanks in advance
====================================
DECLARE
xml varchar2(32000);
xmlt XMLType;
xmlt1 XMLType;
root varchar2(3000);
BEGIN
--Example from w3c.org
xml := '<?xml version="1.0"?>
<bk:book xmlns:bk=''urn:loc.gov:books''
xmlns:isbn=''urn:ISBN:0-395-36341-6''>
<bk:title>Cheaper by the Dozen</bk:title>
<isbn:number>1568491379</isbn:number>
</bk:book>';
xmlt := XMLType( xml );
root := xmlt.getRootElement();
dbms_output.put_line( 'StringVal: ' || xmlt.getStringVal() ); -- The XML is ok
dbms_output.put_line( 'Namespace: ' || xmlt.getNameSpace() ); -- Returns NULL
dbms_output.put_line( 'Root element: ' || root ); -- Returns book
dbms_output.put_line( 'Exists: ' || xmlt.existsNode('book') ); -- Returns ZERO
xmlt1 := xmlt.extract( 'bk:book' ); Raises error (see above)
xmlt1 := xmlt.extract( 'bk::book' ); Raises error (see above)
xmlt1 := xmlt.extract( 'book', 'bk' ); Raises error (see above)
--xmlt1 := xmlt.extract( 'book' );
dbms_output.put_line( 'StringVal: ' || xmlt1.getStringVal() ); Raises error
END;
/

If you put your XML into a namespace then you also need to extract from that namespace.... e.g.
No namespace...
SQL> select t.xml.extract('myroot')
2 from (select XMLTYPE('<myroot><mychild>test</mychild></myroot>') as xml from dual) t
3 ;
T.XML.EXTRACT('MYROOT')
<myroot>
<mychild>test</mychild>
</myroot>Put XML in namespace and now the extract returns nothing...
SQL> ed
Wrote file afiedt.buf
1 select t.xml.extract('myroot')
2* from (select XMLTYPE('<myroot xmlns="fred"><mychild>test</mychild></myroot>') as xml from dual) t
3 /
T.XML.EXTRACT('MYROOT')
--------------------------------------------------------------------------------------------------------Extract, specifying the namespace to extract from and now returns the result...
SQL> ed
Wrote file afiedt.buf
1 select t.xml.extract('myroot', 'xmlns="fred"')
2* from (select XMLTYPE('<myroot xmlns="fred"><mychild>test</mychild></myroot>') as xml from dual) t
SQL> /
T.XML.EXTRACT('MYROOT','XMLNS="FRED"')
<myroot xmlns="fred">
<mychild>test</mychild>
</myroot>
SQL>;)

XMLTYPE and International Characters

Database: Oracle9i
Characterset: US7ASCII
I am trying to insert a very small xml document into an XMLTYPE column in a table.
My xml document, however, contains international characters like French and Spanish letters with their accompanying accent marks.
I have tried setting various encoding schemes in the encoding attribute on the xml document but none of them work.
The parser stops at the first international character and complains that it is invalid.
Is there anything I can do to insert these characters into my XMLTYPE column without complaint?
Thanks.

Please post this message at:
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Nested Tables and Constraints??

Hi all
I have created objects like this
create or replace type type_one
as object
(col_a number(3),
col_b number(2),
col_c varchar2(3 char));
create or replace type type_one_tb as table of type_one;
create or replace type type_two
as object
(col_aa number(2),
col_bb varchar2(3 char),
col_nt type_one_tb);
create or replace type type_two_tb as table of type_two;
create or replace type type_three
as object
(col_cc number(4),
col_ntab type_two_tb)
create table nest_table of type_three
nested table col_ntab store as col_ntab_tbl
(nested table col_nt store as col_nt_tbl);
alter table nest_table
add constraint PK_nest_table
primary key(col_cc);
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col_a the one in type_one type
and col_aa in type_two type
and col_cc in nest_table table
how to do that ?
Thanks

search in Oracle documentation because I sure that nested table can be created. but as you say in end you want to create as many as relation between the child tables , so for this purpose I think use of procedure is best which will really usefull in this situation.

XMLType and Constraints.

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