Who to query and join nested elements

I have a table that contains a XMLTYPE Field. How do I query and join nested elements. For example I have a schema that has a PerstrenList element that holds one or more Perstren nodes. The Perstren node will contain a RemarksList node that can contain one or more Remarks nodes. My goal is to query all of the Remarks and join them with the information in it's parent node. Without the parent node information the remark is meaningless. Following is a example document and desire result set. I know how to query the Perstren or the Remarks I just can not figure out how to marry the two. The query should only return the remarks joined with the parent information.
<RasDataSet>
   <PerstrenList>
        <Perstren>
           <TPERS>A</TPERS>
           <DEPLY>B</DEPLY>
           <STRUC>5</STRUC>
           <RemarksList>
               <REMARK>
                    <LABEL>ABC</LABEL>
                    <GENTEXT>Hello world</GENTEXT>
               </REMARK>
               <REMARK>
                    <LABEL>XYZ</LABEL>
                    <GENTEXT>Oracle XML</GENTEXT>
               </REMARK>
           <RemarksList>
        </Perstren>
        <Perstren>
       <TPERS>C</TPERS>
       <DEPLY>D</DEPLY>
       <STRUC>4</STRUC>
       <RemarksList>
           <REMARK>
                <LABEL>EFG</LABEL>
                <GENTEXT>Database</GENTEXT>
           </REMARK>
       <RemarksList>
        </Perstren>
        <Perstren>
       <TPERS>E</TPERS>
       <DEPLY>F</DEPLY>
       <STRUC>3</STRUC>
        </Perstren>
   <PerstrenList>
</RasDataSet>
desired Results
TPERS DEPLY   LABEL GENTEXT
A       B       ABC   Hello World
A       B       XYZ   Oracle XML
C       D       EFG   Database
select uic,
        extractvalue(Column_value,'/Perstren/TPERS') as TPERS,
        extractvalue(Column_value,'/Perstren/DEPLY') as DEPLY,
        extractvalue(Column_value,'/Perstren/SECUR') as SECUR,
        extractvalue(Column_value,'/Perstren/STRUC') as STRUC,
        extractvalue(Column_value,'/Perstren/TIME') as TIME,
        extractvalue(Column_value,'/Perstren/AUTH') as AUTH,
        extractvalue(Column_value,'/Perstren/ASGD') as ASGD,
from test_ref doc,
    table(XMLSequence(extract(doc.XML_DOC,'/RasDataSet/PerstrenList/Perstren'))) per
[pre]

Sorry my Pre tag was in the wrong place Text reads:
I have a table that contains a XMLTYPE Field. How do I query and join nested elements. For example I have a schema that has a PerstrenList element that holds one or more Perstren nodes. The Perstren node will contain a RemarksList node that can contain one or more Remarks nodes. My goal is to query all of the Remarks and join them with the information in it's parent node. Without the parent node information the remark is meaningless. Following is a example document and desire result set. I know how to query the Perstren or the Remarks I just can not figure out how to marry the two. The query should only return the remarks joined with the parent information.
Sorry my Pre tag was in the wrong place

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|* 2 | TABLE ACCESS BY INDEX ROWID| table1 | 2415K| 460M| | 77975 (1)| | |
|* 3 | INDEX RANGE SCAN | table1_joining_ DATE | 2441K| | | 6463 (2)| | |
| 4 | PARTITION RANGE ALL | | 39M | 718M| | 64745 (2)| 1 | 4 |
| 5 | TABLE ACCESS FULL | table2 | 39M | 718M| | 64745 (2)| 1 | 4 |
table 2 has 40 million rows
Table2 structure
emp_id
ref_no
Project_id
Partitoned on Project_id, Project_id is nowhere used on the above query
Table1 Structure
emp_id
joining_date
other columns
Is indexed on joining_date, not partitioned
Please advise

The CBO has estimated that you have 2415K table1 rows where joining_date = 20090205. (By the way: is this really a number?!)
Is this estimate accurate?
Please add some more information:
- Which version do you use
- How long is "very long time"?
- How many does your query return
- information as described in this thread: When your query takes too long ...
Regards,
Rob.

Loop through nested elements and insert via PL/SQL

INSERT INTO Orders(id, OrderXML) VALUES
(S_Orders.Nextval,
'<?xml version="1.0" encoding="utf-8" ?>
<Order xmlns="urn:foo" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:foo foo-1.xsd">
<OrderRef>BBB</OrderRef>
<OrderDate>2005-03-29</OrderDate>
<CustomerID>1051</CustomerID>
<Items>
<Item>
<ProductID>7</ProductID>
<Price>45.6</Price>
<Quantity>2</Quantity>
</Item>
<Item>
<ProductID>19</ProductID>
<Price>73.5</Price>
<Quantity>10</Quantity>
</Item>
</Items>
</Order>'
I some questions regarding index search of nested elements like,Items in the above example.
I would like to know how I can LOOP through the Items like 1..2 LOOP
and insert those elements(item) into one table. Order information should go in to another table.
Can this be done with xpath and PL/SQL.
Regards
Ulf

Hi Marco!
Here's some more information:
CREATE TABLE ITEM (ProductID NUMBER,
Price NUMBER(8,2)
Quantity 10 NUMBER);
CREATE TABLE ORDER (OrderRef VARCHAR2(10),
ORDER_DATE VARCHAR2(10),
CUSTOMERID NUMBER);
The main problem that I have is to create an solution that can be dynamic so that I can have for instance one order and four items in one XML.
The second XML can have one order and 10 items.
First I want to insert the order elements in the order table and then the items records in the item table.
To complicate things futher my real XML have namespaces in the XML, but this I think I can handle.
Summary: So for each order row(element) I want to traverse the Item elements and insert them to the Item table.
Regards
/Ulf

DB Adapter Query - Polling using nested select

When polling a table to initiate a BPEL process, can I use a nested select in the expression.

The visual expression builder does not currently support this so you need to specify the raw sql directly.
If you use the DeletePollingStrategy there is a way you can specify the exact sql string for both the 'select' and the after read 'delete'. So if you write the where clause yourself it can contain nested selects.
This is the readme from the new PureSQLSelect database adapter sample. Also you may want to look at the PureSQLPolling sample.
This sample shows you how you can bypass the designer's visual where clause builder to specify arbitrarily complex sql strings for your selects.
Like the other samples, this sample uses the basic Movies schema.
The Steps:
Create a basic select. Made sure it has the same name and number of input parameters as you will need for your sql string. In this case create a single input parameter and call it 'genre_param'.
Create a trivial where clause in the wizard expression builder using genre_param. I.e. genre.like(genre_param)
Ideally run the sample once just to make sure everything else works and to get a template SQL. The select ... FROM ... part will be the same.
Open the toplink_mappings.xml file. Look for an element called <database-query>. There will likely only be one. A sample is presented here:
<query-manager>
<descriptor-query-manager>
<existence-check>Check cache</existence-check>
<descriptor-named-queries>
<database-query>
<query-name>selectByGenreSelect</query-name>
<query-should-maintain-cache>true</query-should-maintain-cache>
<cascade-policy>1</cascade-policy>
<should-bind-all-parameters>undefined</should-bind-all-parameters>
<should-cache-statement>undefined</should-cache-statement>
<should-use-wrapper-policy>true</should-use-wrapper-policy>
<query-timeout>0</query-timeout>
<query-arguments>
<string>genre_param</string>
</query-arguments>
<query-argument-types>
<values>java.lang.String</values>
</query-argument-types>
<reference-class>PureSQLSelect.Movies</reference-class>
<refresh-identity-map>false</refresh-identity-map>
<cache-usage>2</cache-usage>
<lock-mode>0</lock-mode>
<distinct-state>0</distinct-state>
<query-indirection>
<in-memory-query-indirection>
<policy>0</policy>
</in-memory-query-indirection>
</query-indirection>
<main-expression>
<expression>
<operator-type>AND</operator-type>
<expression-list>
<expression>
<operator-type>Like</operator-type>
<first-argument>
<argument>
<query-key-name>genre</query-key-name>
<outer-join>false</outer-join>
<to-many>false</to-many>
<argument-class>oracle.toplink.tools.workbench.expressions.QueryableArgumentRepresentation</argument-class>
</argument>
</first-argument>
<second-argument>
<argument>
<parameter-name>genre_param</parameter-name>
<argument-class>oracle.toplink.tools.workbench.expressions.ParameterArgumentRepresentation</argument-class>
</argument>
</second-argument>
<expression-class>oracle.toplink.tools.workbench.expressions.BinaryExpressionRepresentation</expression-class>
</expression>
</expression-list>
<expression-class>oracle.toplink.tools.workbench.expressions.CompoundExpressionRepresentation</expression-class>
</expression>
</main-expression>
<type>oracle.toplink.queryframework.ReadAllQuery</type>
</database-query>
</descriptor-named-queries>
</descriptor-query-manager>
</query-manager>
We want to switch this query from using a high-level expression to a pure sql string. You will remove the <main-expression> element and replace it with a <sql-string> element of your own devising.
Your replacement should look something like this:
<query-manager>
<descriptor-query-manager>
<existence-check>Check cache</existence-check>
<descriptor-named-queries>
<database-query>
<query-name>selectByGenreSelect</query-name>
<query-should-maintain-cache>true</query-should-maintain-cache>
<cascade-policy>1</cascade-policy>
<should-bind-all-parameters>undefined</should-bind-all-parameters>
<should-cache-statement>undefined</should-cache-statement>
<should-use-wrapper-policy>true</should-use-wrapper-policy>
<query-timeout>0</query-timeout>
<sql-string>SELECT DELETED, DIRECTOR, GENRE, LAST_UPDATED, RATED, RATING, RELEASE_DATE, RUN_TIME, SEQUENCENO, STARRING, STATUS, SYNOPSIS, TITLE, TOTAL_GROSS, VIEWER_RATING FROM MOVIES WHERE (upper(GENRE) LIKE upper(concat(concat('%', #genre_param), '%'))) ORDER BY TOTAL_GROSS desc</sql-string>
<query-arguments>
<string>genre_param</string>
</query-arguments>
<query-argument-types>
<values>java.lang.String</values>
</query-argument-types>
<reference-class>PureSQLSelect.Movies</reference-class>
<refresh-identity-map>false</refresh-identity-map>
<cache-usage>2</cache-usage>
<lock-mode>0</lock-mode>
<distinct-state>0</distinct-state>
<query-indirection>
<in-memory-query-indirection>
<policy>0</policy>
</in-memory-query-indirection>
</query-indirection>
<type>oracle.toplink.queryframework.ReadAllQuery</type>
</database-query>
</descriptor-named-queries>
</descriptor-query-manager>
</query-manager>
Gotchas:
The tempation to start writing pure sql may be terrible to some, but it was intentionally left out of the wizard for good reasons. Please be wary of the following when specifying pure sql:
-There is a way to set the pure sql string in the Mapping Workbench, but when you edit the partnerlink to refresh the toplink_mappings.xml you may get an exception due to the query being in a pure sql format. For this reason you need to manually edit the toplink_mappings.xml, and again every time your run the wizard and hit finish after that.
-The #genre_param is a TopLink convention for writing a sql string which still takes parameters. At runtime if you enter 'Action' in the bpel console, you will see this sql:
SELECT DELETED, DIRECTOR, GENRE, LAST_UPDATED, RATED, RATING, RELEASE_DATE, RUN_TIME, SEQUENCENO, STARRING, STATUS, SYNOPSIS, TITLE, TOTAL_GROSS, VIEWER_RATING FROM SYSTEM.MOVIES WHERE (GENRE LIKE ?)
bind => [Action]
The #genre_param gets replaced with the value of the input parameter genre_param.
-When specifying pure sql you should be aware of the following:
-maintenance issues
-loss of database platform independence
-The sql needs to conform with the way TopLink works. It is recommended that you do not change the SELECT ... FROM ... part of the query. TopLink's design is to read from one table at a time. If an Employee has an Address, then the Address is read with a hidden relationship query. There are two advanced TopLink features which optimize reading from multiple tables, called joinedAttribute and batchAttribute reading, but the combination of these features with raw sql was not explored here. So to avoid danger you can only really affect the top level query, and only rewrite the where clause.
-The pure sql route does not interact with most TopLink features, especially batch reading (on by default), and can not be combined with the following:
-LogicalDeletePollingStrategy
-SequencingPollingStrategy (LastUpdated, LastReadId, File)
These features extend the selection criteria at runtime.

Who to query and join nested elements

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