ExtractValue not returning the data after dbms_xmlschema.CopyEvolve

Question

Hi ,
I am facing the problem while selecting the value from the XMLTYPE table using extractValue.
Here address field is newly added to schema and evolved . But unable to get the address field value .
My procedures are like this
SQL> declare
2 res boolean;
3 xmlschema xmltype := xmltype(
4 '<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xdb="http://xmlns.oracle.com/xdb">
5 <xsd:complexType name="t_person" xdb:SQLType="PERSONDT_T">
6 <xsd:sequence>
7 <xsd:element name="persondetails" type="persondetailsType"/>
8 <xsd:element name="companyinfo" type="companyinfoType"/>
9 <xsd:element name="salaryinfo" type="salaryinfoType"/>
10 </xsd:sequence>
11 </xsd:complexType>
12 <xsd:complexType name="persondetailsType" xdb:SQLType="PERSONDETAILS_T">
13 <xsd:sequence>
14 <xsd:element name="personname" type="xsd:string" />
15 <xsd:element name="personexperience" type="xsd:decimal" />
16 </xsd:sequence>
17 </xsd:complexType>
18 <xsd:complexType name="companyinfoType" xdb:SQLType="COMPANYINFO_T">
19 <xsd:sequence>
20 <xsd:element name="companystartdate" type="xsd:date" />
21 <xsd:element name="companystandard" type="xsd:decimal" />
22 </xsd:sequence>
23 </xsd:complexType>
24 <xsd:complexType name="salaryinfoType" xdb:SQLType="SALARYINFO_T">
25 <xsd:sequence>
26 <xsd:element name="salary" type="xsd:decimal" />
27 <xsd:element name="paymonth" type="xsd:string" />
28 </xsd:sequence>
29 </xsd:complexType>
30 <xsd:element name="person" type="t_person" />
31 </xsd:schema>');
32 begin
33 if (dbms_xdb.existsResource('/public/personDetails.xsd')) then
34 dbms_xdb.deleteResource('/public/personDetails.xsd');
35 end if;
36 res := dbms_xdb.createResource('/public/personDetails.xsd',xmlschema);
37 end;
38 /
PL/SQL procedure successfully completed.
SQL> begin
2 dbms_xmlschema.registerSchema ('www.PersonInfoUrl.com',xdburitype('/public/personDetails.xsd'),TRUE,TRUE,FALSE,TRUE);
3 end;
4 /
PL/SQL procedure successfully completed.
SQL> CREATE TABLE PERSON_COMP_TABLE
2 (empId VARCHAR2(100) CONSTRAINT pk_PERSONCOMP PRIMARY KEY
3 ,comments VARCHAR2(20)
4 ,joindate DATE
5 ,personjoininfo xmltype)
6 XMLTYPE COLUMN personjoininfo XMLSCHEMA "www.PersonInfoUrl.com" element "person"
7 /
Table created.
SQL> insert into PERSON_COMP_TABLE (empId ,comments ,joindate ,personjoininfo )
2 values ('2006NEW312','RDDEPT','15-jan-2006',
3 sys.XMLType.createXML(
4 '<?xml version="1.0" encoding="UTF-8"?>
5 <person xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="www.PersonInfoUrl.com">
6 <persondetails>
7 <personname>Robert </personname>
8 <personexperience>4.5</personexperience>
9 </persondetails>
10 <companyinfo>
11 <companystartdate>2004-07-24</companystartdate>
12 <companystandard>3.9</companystandard>
13 </companyinfo>
14 <salaryinfo>
15 <salary>2444.3</salary>
16 <paymonth> june </paymonth>
17 </salaryinfo>
18 </person>'))
19 /
1 row created.
SQL> select count(*) from PERSON_COMP_TABLE;
COUNT(*)
1
SQL> declare
xmlschema xmltype := xdburitype('/public/personDetails.xsd').getXML();
res boolean;
begin
select insertChildXML(
xmlschema,
'/xsd:schema/xsd:complexType[@name="companyinfo"]/xsd:sequence',
'xsd:element',
xmltype('<xsd:element xmlns:xsd="http://www.w3.org/2001/XMLSchema" name="address" type="xsd:string"
'xmlns:xsd="http://www.w3.org/2001/XMLSchema"'
into xmlSchema
from dual;
if (dbms_xdb.existsResource('/public/personDetails.xsd')) then
dbms_xdb.deleteResource('/public/personDetails.xsd');
end if;
res := dbms_xdb.createResource('/public/newpersonDetails.xsd',xmlschema);
end;
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.74
SQL> commit;
Commit complete.
Elapsed: 00:00:00.56
SQL> begin
dbms_xmlschema.CopyEvolve
xdb$string_list_t('www.PersonInfoUrl.com'),
XMLSequenceType(xdburitype('/public/newpersonDetails.xsd').getXML()),
null
end;
PL/SQL procedure successfully completed.
Elapsed: 00:00:08.49
SQL> commit;
Commit complete.
Elapsed: 00:00:00.52
SQL> select count(*) from PERSON_COMP_TABLE;
COUNT(*)
1
SQL> insert into PERSON_COMP_TABLE (empId ,comments ,joindate ,personjoininfo )
values ('1234PTR','DTSDDEPT','12-jan-2006',
sys.XMLType.createXML(
'<?xml version="1.0" encoding="UTF-8"?>
<person xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="www.PersonInfoUrl.com">
<persondetails>
<personname>Julie </personname>
<personexperience>3.5</personexperience>
</persondetails>
<companyinfo>
<companystartdate>2005-11-21</companystartdate>
<companystandard>3.9</companystandard>
<address>santaclara</address>
</companyinfo>
<salaryinfo>
<salary>2444.3</salary>
<paymonth> june </paymonth>
</salaryinfo>
</person>'))
1 row created.
SQL> select count(*) from PERSON_COMP_TABLE;
COUNT(*)
2
SQL> SELECT empid, extractValue(personjoininfo,'/person/companyinfo/address') FROM PERSON_COMP_TABLE
2 /
empid
E
1234PTR
Here "address " is not returned. it has return the value "santaclara".
How to solve this ?. Please advise
Thanks
Govinda

Answer 1

After chasing down couple of silly mistakes I was able to get your example to work
SQL> call dbms_xmlschema.deleteSchema ('www.PersonInfoUrl.com',4)
  2  /
Call completed.
SQL> declare
  2    res boolean;
  3    xmlschema xmltype := xmltype(
  4  '<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xdb="http://xmlns.oracle.com/xdb">
  5     <xsd:complexType name="t_person" xdb:SQLType="PERSONDT_T">
  6             <xsd:sequence>
  7                     <xsd:element name="persondetails" type="persondetailsType"/>
  8                     <xsd:element name="companyinfo" type="companyinfoType"/>
  9                     <xsd:element name="salaryinfo" type="salaryinfoType"/>
10             </xsd:sequence>
11     </xsd:complexType>
12     <xsd:complexType name="persondetailsType" xdb:SQLType="PERSONDETAILS_T">
13             <xsd:sequence>
14                     <xsd:element name="personname" type="xsd:string"/>
15                     <xsd:element name="personexperience" type="xsd:decimal"/>
16             </xsd:sequence>
17     </xsd:complexType>
18     <xsd:complexType name="companyinfoType" xdb:SQLType="COMPANYINFO_T">
19             <xsd:sequence>
20                     <xsd:element name="companystartdate" type="xsd:date"/>
21                     <xsd:element name="companystandard" type="xsd:decimal"/>
22             </xsd:sequence>
23     </xsd:complexType>
24     <xsd:complexType name="salaryinfoType" xdb:SQLType="SALARYINFO_T">
25             <xsd:sequence>
26                     <xsd:element name="salary" type="xsd:decimal"/>
27                     <xsd:element name="paymonth" type="xsd:string"/>
28             </xsd:sequence>
29     </xsd:complexType>
30     <xsd:element name="person" type="t_person"/>
31  </xsd:schema>');
32  begin
33    if (dbms_xdb.existsResource('/public/personDetails.xsd')) then
34      dbms_xdb.deleteResource('/public/personDetails.xsd');
35    end if;
36    res := dbms_xdb.createResource('/public/personDetails.xsd',xmlschema);
37  end;
38  /
PL/SQL procedure successfully completed.
SQL> begin
  2    dbms_xmlschema.registerSchema ('www.PersonInfoUrl.com',xdburitype('/public/personDetails.xsd'),TRUE,TRUE,FALSE,TRUE);
  3  end;
  4  /
PL/SQL procedure successfully completed.
SQL> DROP TABLE PERSON_COMP_TABLE
  2  /
Table dropped.
SQL> CREATE TABLE PERSON_COMP_TABLE
  2  (
  3    empId VARCHAR2(100) CONSTRAINT pk_PERSONCOMP PRIMARY KEY
  4    ,comments VARCHAR2(20)
  5    ,joindate DATE
  6    ,personjoininfo xmltype
  7  )
  8  XMLTYPE COLUMN personjoininfo XMLSCHEMA "www.PersonInfoUrl.com" element "person"
  9  /
Table created.
SQL> insert into PERSON_COMP_TABLE (empId ,comments ,joindate ,personjoininfo )
  2  values ('2006NEW312','RDDEPT','15-jan-2006',
  3  XMLType(
  4  '<?xml version="1.0" encoding="UTF-8"?>
  5  <person xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="www.PersonInfoUrl.com">
  6     <persondetails>
  7             <personname>Robert </personname>
  8             <personexperience>4.5</personexperience>
  9     </persondetails>
10     <companyinfo>
11             <companystartdate>2004-07-24</companystartdate>
12             <companystandard>3.9</companystandard>
13     </companyinfo>
14     <salaryinfo>
15             <salary>2444.3</salary>
16             <paymonth> june </paymonth>
17     </salaryinfo>
18  </person>'))
19  /
1 row created.
SQL> select count(*) from PERSON_COMP_TABLE
  2  /
  COUNT(*)
         1
SQL> declare
  2    xmlschema xmltype := xdburitype('/public/personDetails.xsd').getXML();
  3    res boolean;
  4  begin
  5    select insertChildXML
  6           (
  7             xmlschema,
  8             '/xsd:schema/xsd:complexType[@name="companyinfoType"]/xsd:sequence',
  9             'xsd:element',
10             xmltype('<xsd:element xmlns:xsd="http://www.w3.org/2001/XMLSchema" name="address" type="xsd:string"/>'),
11             'xmlns:xsd="http://www.w3.org/2001/XMLSchema"'
12           )
13      into xmlSchema
14      from dual;
15
16    if (dbms_xdb.existsResource('/public/newPersonDetails.xsd')) then
17      dbms_xdb.deleteResource('/public/newPersonDetails.xsd');
18    end if;
19
20    res := dbms_xdb.createResource('/public/newPersonDetails.xsd',xmlschema);
21  end;
22  /
PL/SQL procedure successfully completed.
SQL> commit
  2  /
Commit complete.
SQL> begin
  2    dbms_xmlschema.CopyEvolve
  3    (
  4       xdb$string_list_t('www.PersonInfoUrl.com'),
  5       XMLSequenceType(xdburitype('/public/newPersonDetails.xsd').getXML()),
  6       null
  7     );
  8  end;
  9  /
PL/SQL procedure successfully completed.
SQL> select count(*) from PERSON_COMP_TABLE
  2  /
  COUNT(*)
         1
SQL> insert into PERSON_COMP_TABLE (empId ,comments ,joindate ,personjoininfo )
  2  values ('1234PTR','DTSDDEPT','12-jan-2006',
  3  XMLType(
  4  '<?xml version="1.0" encoding="UTF-8"?>
  5  <person xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="www.PersonInfoUrl.com">
  6     <persondetails>
  7             <personname>Julie </personname>
  8             <personexperience>3.5</personexperience>
  9     </persondetails>
10     <companyinfo>
11             <companystartdate>2005-11-21</companystartdate>
12             <companystandard>3.9</companystandard>
13             <address>santaclara</address>
14     </companyinfo>
15     <salaryinfo>
16             <salary>2444.3</salary>
17             <paymonth> june </paymonth>
18     </salaryinfo>
19  </person>'))
20  /
1 row created.
SQL> commit
  2  /
Commit complete.
SQL> select count(*) from PERSON_COMP_TABLE
  2  /
  COUNT(*)
         2
SQL> SELECT empid, extractValue(personjoininfo,'/person/companyinfo/address') FROM PERSON_COMP_TABLE
  2  /
EMPID
EXTRACTVALUE(PERSONJOININFO,'/PERSON/COMPANYINFO/ADDRESS')
2006NEW312
1234PTR
santaclara
SQL>The mistakes included the XPath used to insert the new element into the XML Schema
You had
'/xsd:schema/xsd:complexType[@name="companyinfo"]/xsd:sequence',
where as the correct XPath is
'/xsd:schema/xsd:complexType[@name="companyinfoType"]/xsd:sequence',
and then you had
if (dbms_xdb.existsResource('/public/personDetails.xsd')) then
dbms_xdb.deleteResource('/public/personDetails.xsd');
end if;
res := dbms_xdb.createResource('/public/newpersonDetails.xsd',xmlschema);
end;
which means that once the document newpersonDetails.xsd had been created once a subsequent execution of the testcase would fail as the document would already exist.
I'm also a little confused... Your testcase implies that you were able to insert the second document, but the number of rows in the table is still shown as 1 after the insert apparently succeeded. Since you did not correctly update the XML Schema before the calling copyEvolve I do not understand how your output shows that the second insert succeeded.