Using prepareStatement with parameter in existsNode() function

Question

Hello,
I have an xml file like the following:
<MyDocRoot id="myId" xmlns="..." xmlns:xsi="..." xsi:schemaLocation="...">
</MyDocRoot>
I am retrieving my documents from an XMLType table with aquery like:
SELECT OBJECT_VALUE FROM MY_TABLE
WHERE existsNode(OBJECT_VALUE, '/MyDocRoot[@id="myId"]') = 1;
When I run it using oracle client everything works fine and great.
Now I would like to execute that query from a Java application, using prepared statement, so with a query now like:
SELECT OBJECT_VALUE FROM MY_TABLE
WHERE existsNode(OBJECT_VALUE, '/MyDocRoot[@id="?"]') = 1;
And passing the id value as the parameter at execution time.
The problem I am facing is that it seems that the prepare statement does not recognize the parameter at that place. I get an error specifying that one parameter was provided but none was expected.
I get the same problem when I try to update a document in the database. In this case I have the query is:
UPDATE MY_TABLE SET OBJECT_VALUE = XMLType(?)
WHERE existsNode(OBJECT_VALUE, '/MyDocRoot[@id="?"]') = 1
The error I receive specify that 2 parameters were provided but only one was expected (the parameter in the XMLType() is recognized but not the one in the XPATH expression)
Does anybody have an example on how to use prepare statement with parameters in XPATH expression like above?

Answer 1

Try this
package com.oracle.st.xmldb.pm.examples;
import com.oracle.st.xmldb.pm.common.baseApp.BaseApplication;
import oracle.jdbc.OraclePreparedStatement;
import oracle.jdbc.OracleResultSet;
import oracle.xdb.XMLType;
import oracle.xml.parser.v2.XMLDocument;
public class GetXMLType extends BaseApplication
   public void doSomething(String[] Args) throws Exception
     OraclePreparedStatement  statement = null;
     String statementText;
     statementText = "select object_value from PURCHASEORDER where existsNode(object_value,'/PurchaseOrder[Reference=\"' || :1 || '\"]') = 1";
     OracleResultSet resultSet = null;
     XMLDocument  doc = null;
     XMLType xml;
     statement = (OraclePreparedStatement) getConnection().prepareStatement(statementText);
     statement.setString(1,"AHUNOLD-20040817185414366GMT");
     resultSet = (OracleResultSet) statement.executeQuery();
     while (resultSet.next())
        xml = (XMLType) resultSet.getObject(1);
        doc = (XMLDocument) xml.getDocument();
        doc.print(System.out);
       resultSet.close();
       statement.close();
       getConnection().close();
  public static void main (String[] args)
    try
      GetXMLType example = new GetXMLType();
      example.initializeConnection();
      example.doSomething(args);
    catch (Exception e)
      e.printStackTrace();
}Gives
C:\TEMP>
C:\oracle\product\11.1.0\db_1\jdk\bin\javaw.exe -client -classpath C:\xdb\JDeveloper\Classes;C:\oracle\product\11.1.0\db_1\jdbc\lib\ojdbc5.jar;C:\oracle\product\11.1.0\db_1\LIB\xmlparserv2.jar;C:\oracle\product\11.1.0\db_1\RDBMS\jlib\xdb.jar;C:\oracle\JDeveloper\j2ee\home\oc4j.jar;C:\oracle\JDeveloper\j2ee\home\lib\servlet.jar -Dcom.oracle.st.xmldb.pm.ConnectionParameters=C:\\xdb\\jdeveloper\\SimpleExamples\\LocalConnection.xml -Dhttp.proxyHost=www-proxy.us.oracle.com -Dhttp.proxyPort=80 -Dhttp.nonProxyHosts=localhost|us.oracle.com|*.oracle.com -Dhttps.proxyHost=www-proxy.us.oracle.com -Dhttps.proxyPort=80 -Dhttps.nonProxyHosts=localhost|us.oracle.com|*.oracle.com com.oracle.st.xmldb.pm.examples.GetXMLType -mx2048M
Using connection Parameters from : C:\\xdb\\jdeveloper\\SimpleExamples\\LocalConnection.xml
ConnectionProvider.establishConnection(): Connecting as SQLLDR/SQLLDR@jdbc:oracle:oci8:@(description=(address=(host=localhost)(protocol=tcp)(port=1521))(connect_data=(service_name=ORA11GR1.xp.mark.drake.oracle.com)(server=DEDICATED)))
ConnectionProvider.establishConnection(): Database Connection Established
<PurchaseOrder xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://localhost:8080/home/SCOTT/poSource/xsd/purchaseOrder.xsd">
   <Reference>AHUNOLD-20040817185414366GMT</Reference>
   <Actions>
      <Action>
         <User>AHUNOLD</User>
      </Action>
   </Actions>
   <Reject/>
   <Requestor>Alexander Hunold</Requestor>
   <User>AHUNOLD</User>
   <CostCenter>A60</CostCenter>
   <ShippingInstructions>
      <name>Elizabeth Bates</name>
      <address>Magdalen Centre, The Oxford Science Park,
Oxford,
Oxford OX9 9ZB
United Kingdom</address>
      <telephone>980-985-4081</telephone>
   </ShippingInstructions>
   <SpecialInstructions>Next Day Air</SpecialInstructions>
   <LineItems>
      <LineItem ItemNumber="1">
         <Description>Farewell, My Concubine</Description>
         <Part Id="717951002723" UnitPrice="19.99" Quantity="3"/>
      </LineItem>
      <LineItem ItemNumber="2">
         <Description>Willy Wonka and the Chocolate Factory</Description>
         <Part Id="85392229123" UnitPrice="19.99" Quantity="4"/>
      </LineItem>
      <LineItem ItemNumber="3">
         <Description>Best In Show</Description>
         <Part Id="85391895121" UnitPrice="19.99" Quantity="3"/>
      </LineItem>
      <LineItem ItemNumber="4">
         <Description>The Reggae Movie</Description>
         <Part Id="13023004597" UnitPrice="19.99" Quantity="1"/>
      </LineItem>
   </LineItems>
</PurchaseOrder>
Process exited with exit code 0.