Returning XMLType to JSP

Question

Hello, all.
I have a stored function that returns XMLType data to a JSP page, similar to the example in the Oracle XML DB Developer's Guide (13-4). My schema was developed with great help from this forum and is referenced here:Re: unique constraint defined in xsd
My problem is I am getting the following error when I try to access the returned data in the jsp page:
java.lang.ClassCastException: oracle.sql.OPAQUE
     at querymaps.jspService(querymaps.jsp:45)
I cannot quite figure out how to get to the returned data.
Here is the stored function and a sample of data the same select statement returns:
CREATE OR REPLACE FUNCTION getMaps(userName varchar2)
RETURN XMLTYPE
AS
xmlDoc XMLTYPE;
BEGIN
SELECT extract(OBJECT_VALUE, '/mapset/map') into xmlDoc
FROM mapsetxml
WHERE existsNode(OBJECT_VALUE,'/mapset['''|| username ||''']')=1;
RETURN xmlDoc;
END;
<map>
<mapname>Florida</mapname>
<layer>
<layername>Counties</layername>
<layerid>counties</layerid>
<service>base</service>
<visible>1</visible>
<ftype>polygon</ftype>
</layer>
<placemark>
<placename>Florida</placename>
<envelope>
<minx>-186185.234572</minx>
<miny>2709914.999735</miny>
<maxx>596332.812876</maxx>
<maxy>3464678.999670</maxy>
</envelope>
</placemark>
</map>
The JSP scriplet code is nearly right from the sample- I am using a dataSource connection, so I don't know if that is the problem, or not.
<%
Connection conn=null;
CallableStatement stmt = null;
String dSrcName="jdbc/localDS";
String userName="tester";
XMLType xmlRes = null;
InitialContext ctxt = new InitialContext();
DataSource ds = (DataSource) ctxt.lookup(dSrcName);
conn = ds.getConnection();
try {        
stmt=conn.prepareCall("{ ? = call getmaps(?)}");
stmt.registerOutParameter(1, OracleTypes.OPAQUE,"SYS.XMLTYPE");
stmt.setString(2, userName);
stmt.execute();
xmlRes = (XMLType) stmt.getObject(1);
if (xmlRes != null) {
String mapString = xmlRes.getStringVal();
out.println("The map xml for :"+userName+" is "+mapString);
} catch (SQLException se) {
out.println(se.getMessage());
} catch (Exception e) {
out.println(e.getMessage());
} finally {
stmt.close();
conn.close();
%>
Thanks again.

Answer 1

Given the follow
SQL> var schemaURL varchar2(256)
SQL> var schemaPath varchar2(256)
SQL> --
SQL> begin
  2    :schemaURL := 'http://localhost:8080/public/mapset.xsd';
  3    :schemaPath := '/public/mapset.xsd';
  4  end;
  5  /
PL/SQL procedure successfully completed.
SQL> call dbms_xmlSchema.deleteSchema(:schemaURL,4)
  2  /
Call completed.
SQL> declare
  2    res boolean;
  3    xmlSchema xmlType := xmlType(
  4  '<?xml version="1.0" encoding="UTF-8" ?>
  5  <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
  6             xmlns:xdb="http://xmlns.oracle.com/xdb"
  7             version="1.0" xdb:storeVarrayAsTable="true">
  8    <!-- definition of simple types -->
  9    <xs:simpleType name="nameType">
10      <xs:restriction base="xs:string">
11        <xs:minLength value="1"/>
12        <xs:maxLength value="50"/>
13      </xs:restriction>
14    </xs:simpleType>
15    <xs:simpleType name="boolType">
16      <xs:restriction base="xs:unsignedByte">
17        <xs:minInclusive value="0"/>
18        <xs:maxInclusive value="1"/>
19      </xs:restriction>
20    </xs:simpleType>
21     <xs:simpleType name="minxType">
22      <xs:restriction base="xs:string">
23      </xs:restriction>
24    </xs:simpleType>
25     <xs:simpleType name="minyType">
26      <xs:restriction base="xs:string">
27      </xs:restriction>
28    </xs:simpleType>
29     <xs:simpleType name="maxxType">
30      <xs:restriction base="xs:string">
31      </xs:restriction>
32    </xs:simpleType>
33     <xs:simpleType name="maxyType">
34      <xs:restriction base="xs:string">
35      </xs:restriction>
36    </xs:simpleType>
37    <xs:simpleType name="usernameType">
38      <xs:restriction base="xs:string">
39        <xs:minLength value="7"/>
40        <xs:maxLength value="8"/>
41      </xs:restriction>
42    </xs:simpleType>
43    <xs:simpleType name="emailType">
44      <xs:restriction base="xs:string">
45        <xs:minLength value="19"/>
46        <xs:maxLength value="63"/>
47      </xs:restriction>
48    </xs:simpleType>
49     <!-- definition of complex types -->
50  <xs:complexType name="envType">
51      <xs:sequence>
52        <xs:element name="minx"  type="minxType" minOccurs="1" xdb:SQLName="MINX" />
53        <xs:element name="miny" type="minyType" minOccurs="1" xdb:SQLName="MINY"/>
54        <xs:element name="maxx"  type="maxxType" minOccurs="1" xdb:SQLName="MAXX" />
55        <xs:element name="maxy" type="maxyType" minOccurs="1" xdb:SQLName="MAXY"/>
56      </xs:sequence>
57    </xs:complexType>
58   <xs:complexType name="placemarkType">
59      <xs:sequence>
60        <xs:element name="placename"  type="nameType" minOccurs="1" xdb:SQLName="PLACENAME"/>
61        <xs:element name="envelope" type="envType" minOccurs="1" xdb:SQLName="ENVELOPE"/>
62      </xs:sequence>
63    </xs:complexType>
64    <xs:complexType name="layerType">
65      <xs:sequence>
66        <xs:element name="layername"  type="nameType" minOccurs="1" xdb:SQLName="LAYERNAME" />
67        <xs:element name="layerid"  type="nameType" minOccurs="1" xdb:SQLName="LAYERID" />
68        <xs:element name="service" type="nameType" minOccurs="1" xdb:SQLName="SERVICE"/>
69        <xs:element name="visible" type="boolType" xdb:SQLName="VISIBLE"/>
70        <xs:element name="ftype" type="nameType" xdb:SQLName="FTYPE" minOccurs="1" maxOccurs="1"/>
71      </xs:sequence>
72    </xs:complexType>
73     <xs:complexType name="mapType">
74      <xs:sequence>
75        <xs:element name="mapname"  type="nameType" minOccurs="1" xdb:SQLName="MAPNAME"/>
76        <xs:element name="layer"  type="layerType" minOccurs="1" maxOccurs="unbounded" xdb:SQLName="LAYER" />
77        <xs:element name="placemark" type="placemarkType" minOccurs="1" maxOccurs="unbounded"  xdb:SQLName="PLACEMARK"/>
78      </xs:sequence>
79    </xs:complexType>
80    <xs:complexType name="mapsetType" xdb:SQLType="mapset_t">
81      <xs:sequence>
82        <xs:element name="username"  type="usernameType" minOccurs="1" xdb:SQLName="USERNAME" />
83       <xs:element name="map" type="mapType" minOccurs="1" maxOccurs="unbounded"  xdb:SQLName="MAP" xdb:SQLCollType="MAP_V"/>
84       <xs:element name="startmap" type="nameType" minOccurs="1" maxOccurs="1" xdb:SQLName="STARTMAP"/>
85       <xs:element name="startplace" type="nameType" minOccurs="1" maxOccurs="1" xdb:SQLName="STARTPLACE"/>
86      </xs:sequence>
87    </xs:complexType>
88   <!--definition of main element -->
89    <xs:element name="mapset" type="mapsetType" xdb:defaultTable="MAPSETXML">
90      <xs:unique name="mapNameKey">
91         <xs:selector xpath=".//map"/>
92         <xs:field xpath="mapname"/>
93      </xs:unique>
94    </xs:element>
95    </xs:schema>');
96  begin
97    if (dbms_xdb.existsResource(:schemaPath)) then
98      dbms_xdb.deleteResource(:schemaPath);
99    end if;
100    res := dbms_xdb.createResource(:schemaPath,xmlSchema);
101  end;
102  /
PL/SQL procedure successfully completed.
SQL> begin
  2    dbms_xmlschema.registerSchema
  3    (
  4      :schemaURL,
  5      xdbURIType(:schemaPath).getClob(),
  6      TRUE,TRUE,FALSE,TRUE
  7    );
  8  end;
  9  /
PL/SQL procedure successfully completed.
SQL> declare
  2    nested_table_name varchar2(32);
  3  begin
  4    select table_name
  5      into nested_table_name
  6      from user_nested_tables
  7     where table_type_name = 'MAP_V'
  8       and parent_table_name = 'MAPSETXML';
  9
10     execute immediate 'rename "'|| nested_table_name ||'" to MAP_TABLE';
11
12  end;
13  /
PL/SQL procedure successfully completed.
SQL> desc MAPSETXML
Name                                      Null?    Type
TABLE of SYS.XMLTYPE(XMLSchema "http://localhost:8080/public/mapset.xsd" Element "mapset") STORAGE Object-relational TYPE "mapset_t"
SQL> --
SQL> desc MAP_TABLE
Name                                      Null?    Type
SYS_XDBPD$                                         XDB.XDB$RAW_LIST_T
MAPNAME                                            VARCHAR2(50 CHAR)
LAYER                                              LAYER7525_COLL
PLACEMARK                                          PLACEMARK7528_COLL
SQL> --
SQL> --
SQL> create or replace trigger VALIDATE_MAPSET
  2  before insert or update on MAPSETXML
  3  for each row
  4  begin
  5     :new.object_value.schemaValidate();
  6  end;
  7  /
Trigger created.
SQL> insert into MAPSETXML values ( xmltype('<mapset>
  2  <username>tester1</username>
  3  <map>
  4  <mapname>Florida</mapname>
  5  <layer>
  6  <layername>Counties</layername>
  7  <layerid>counties</layerid>
  8  <service>base</service>
  9  <visible>1</visible>
10  <ftype>polygon</ftype>
11  </layer>
12  <placemark>
13  <placename>Florida</placename>
14  <envelope>
15  <minx>-186185.234572</minx>
16  <miny>2709914.999735</miny>
17  <maxx>596332.812876</maxx>
18  <maxy>3464678.999670</maxy>
19  </envelope>
20  </placemark>
21  </map>
22  <startmap>test</startmap>
23  <startplace>Tallahassee</startplace>
24  </mapset>
25  ').createSchemaBasedXML('http://localhost:8080/public/mapset.xsd'))
26  /
1 row created.
SQL> commit
  2  /
Commit complete.
SQL> set long 100000
SQL> --
SQL> select * from MAPSETXML
  2  /
SYS_NC_ROWINFO$
<mapset>
  <username>tester1</username>
  <map>
    <mapname>Florida</mapname>
    <layer>
      <layername>Counties</layername>
      <layerid>counties</layerid>
      <service>base</service>
      <visible>1</visible>
      <ftype>polygon</ftype>
    </layer>
SYS_NC_ROWINFO$
    <placemark>
      <placename>Florida</placename>
      <envelope>
        <minx>-186185.234572</minx>
        <miny>2709914.999735</miny>
        <maxx>596332.812876</maxx>
        <maxy>3464678.999670</maxy>
      </envelope>
    </placemark>
  </map>
  <startmap>test</startmap>
SYS_NC_ROWINFO$
  <startplace>Tallahassee</startplace>
</mapset>
SQL> CREATE OR REPLACE FUNCTION getMaps(userName varchar2)
  2  RETURN XMLTYPE
  3  AS
  4  xmlDoc XMLTYPE;
  5  BEGIN
  6    SELECT extract(OBJECT_VALUE, '/mapset/map') into xmlDoc
  7    FROM mapsetxml
  8    WHERE existsNode(OBJECT_VALUE,'/mapset['''|| username ||''']')=1;
  9    RETURN xmlDoc;
10  END;
11  /
Function created.
SQL> select getMaps('Florida') from dual;
GETMAPS('FLORIDA')
<map>
  <mapname>Florida</mapname>
  <layer>
    <layername>Counties</layername>
    <layerid>counties</layerid>
    <service>base</service>
    <visible>1</visible>
    <ftype>polygon</ftype>
  </layer>
  <placemark>
    <placename>Florida</placename>
GETMAPS('FLORIDA')
    <envelope>
      <minx>-186185.234572</minx>
      <miny>2709914.999735</miny>
      <maxx>596332.812876</maxx>
      <maxy>3464678.999670</maxy>
    </envelope>
  </placemark>
</map>
SQL>The following Java code
package com.oracle.st.xmldb.otn;
import com.oracle.st.xmldb.pm.common.baseApp.BaseApplication;
import com.oracle.st.xmldb.pm.examples.GetResourceByResourceID;
import oracle.jdbc.OracleCallableStatement;
import oracle.jdbc.OracleTypes;
import oracle.sql.RAW;
import oracle.xdb.XMLType;
import oracle.xdb.dom.XDBDocument;
public class T415572 extends BaseApplication {
    public T415572() {
    public void doSomething(String[] Args) throws Exception
      OracleCallableStatement  statement = null;
      boolean result;
      statement = (OracleCallableStatement) getConnection().prepareCall("{ ? = call getmaps(?)}");
      statement.registerOutParameter(1,OracleTypes.OPAQUE,"SYS.XMLTYPE");
      statement.setString(2,"Florida");
      result = statement.execute();
      XMLType xml = (XMLType) statement.getObject(1);
      statement.close();
      XDBDocument doc = (XDBDocument) xml.getDOM();
      doc.writeToOutputStream(System.out);
      doc.close();
      getConnection().close();
    public static void main (String[] args)
     try
       BaseApplication example = new T415572();
       example.initializeConnection();
       example.doSomething(args);
     catch (Exception e)
       e.printStackTrace();
}results in
C:\TEMP>
C:\Oracle\JDeveloper\jdk\bin\javaw.exe -client -classpath C:\xdb\JDeveloper\Classes;C:\Oracle\product\10.2.0\db_1\jdbc\lib\ojdbc14.jar;C:\Oracle\product\10.2.0\db_1\LIB\xmlparserv2.jar;C:\Oracle\product\10.2.0\db_1\RDBMS\jlib\xdb.jar;C:\xdb\JDeveloper\jakarta-slide-webdavclient-bin-2.1\lib\jakarta-slide-webdavlib-2.1.jar;C:\xdb\JDeveloper\jakarta-slide-webdavclient-bin-2.1\lib\commons-httpclient.jar;C:\xdb\JDeveloper\jakarta-slide-webdavclient-bin-2.1\lib\commons-logging.jar;C:\xdb\JDeveloper\jakarta-slide-webdavclient-bin-2.1\lib\jdom-1.0.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=192.168.0.77|localhost|192.168.1.1|*.oracle.com|*.us.oracle.com -Dhttps.proxyHost=www-proxy.us.oracle.com -Dhttps.proxyPort=80 -Dhttps.nonProxyHosts=192.168.0.77|localhost|192.168.1.1|*.oracle.com|*.us.oracle.com com.oracle.st.xmldb.otn.T415572 -mx2048M
ConnectionProvider.establishConnection(): Connecting as SCOTT/TIGER@jdbc:oracle:oci8:@(description=(address=(host=localhost)(protocol=tcp)(port=1521))(connect_data=(service_name=ORA10GR2.xp.mark.drake.oracle.com)(server=DEDICATED)))
ConnectionProvider.establishConnection(): Database Connection Established
<map>
  <mapname>Florida</mapname>
  <layer>
    <layername>Counties</layername>
    <layerid>counties</layerid>
    <service>base</service>
    <visible>1</visible>
    <ftype>polygon</ftype>
  </layer>
  <placemark>
    <placename>Florida</placename>
    <envelope>
      <minx>-186185.234572</minx>
      <miny>2709914.999735</miny>
      <maxx>596332.812876</maxx>
      <maxy>3464678.999670</maxy>
    </envelope>
  </placemark>
</map>
Process exited with exit code 0.The code also works fine when modified to work with the thin driver...
Message was edited by:
mdrake