How to store xml data fragments, that will not be queried?

Question

Hello,
Delphi Client application communicates with Java Server application via XML messages. Client sends XML message over HTTP Post method. Java Servlet gets XML message, parses it, performs requested action (select/insert/update/delete), generates resulting response and sends it back to the Client.
I use Oracle DB XE 10.2.
For example: Client sends a request to the server, to append certain Order with new Product info:
Request:
<?xml version="1.0" encoding="UTF-8" ?>
- <Request OrderID="123123123" Action="NewProduct">
- <Product TempProdID="2" ProdName="L01" VisualID="1" Amount="1" TechClass="1" TechSubject="1" TechVersion="0" TechName="TestTech" ElemOk="0">
<Modified UserID="XXX" UserGroup="XXX" GroupLevel="0" />
- <QuickInfo>
<ProdIcon Format="PNG"
Encoding="Base64">iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAIAAAA
lC+aJAAAAA3RSTlP////6yOLMAAAAvElEQVR42u3aQQ6EIAwAQP7/afe0
mo1mBVur0emJgwGmRDFNWwvH9I153OpjyoisefqXW3afm4WypP+MgomvT
z8AAAAAAAAAAAAAAMAzAClzAWQAdvexfqATEKmA/Fm0rYs5ozvoAWyWj4
ZqJ9efQKR8BJAHOPEdKAAc/lLdAhC/K68EBG+JWwAixfABgF8Jf6MAAAA
AAAAAAAAAAAAALwRUGgAAAAAAsgGJ3cfVrcfFl2jiIZzV+V7Zd/8BOtNi
0MnJ58oAAAAASUVORK5CYII=
</ProdIcon>
<Parameters />
</QuickInfo>
- <TechProduct CurVer="1" MinVer="1" TotalItems="330" ItemNodeSize="55074">
- <SubItem Class="TPlGraph" BindID="00B9C004">
<PropList />
- <SubItem Ident="Profiles" Class="TProfileList" Child="1" BindID="0188598C">
<PropList />
- <SubItem Class="TPlProfile" Child="1" BindID="018CA6CC">
- <PropList>
<Property PropIdent="ProfBaze0X" ValText="0" />
<Property PropIdent="ProfBaze0Y" ValText="990" />
<Property PropIdent="ProfBaze1X" ValText="990" />
<Property PropIdent="ProfHier0" ValText="0" />
- <Property PropIdent="InBorder" ValIdent="None" ValText="N&#279;ra">
<ExtValue ColIdent="ItemCode" Value="None" />
<ExtValue ColIdent="Type" Value="" />
<ExtValue ColIdent="Filter" Value="" />
<ExtValue ColIdent="Width" Value="0" />
<ExtValue ColIdent="TechCall" Value="" />
</Property>
</PropList>
</SubItem>
</SubItem>
</SubItem>
</TechProduct>
</Product>
</Request>
I use DOM parsers to parse the received requests, extract certain info and insert it into relational tables using standart SQL queries.
My question is: what is the best way to store XML data fragments, that are not required to be saved relationally? I need to save the content of node <TechProduct> from the above example to relational table's column. There will be no need to query this column, no need to use relational views. I will use it only when Client application will request to modify certain order's product. Then I will have to send back the same <TechProduct> node via XML response.
So what column type do I have to use? CLOB? XMLType? Is it better to use object types? Do I have to register XML Schema for better performance? The size of the fragment can be ~2MB.
Thanks for your help
Message was edited by:
Kichas

Answer 1

Thank you for reply,
As you suggested, I will use XMLType storage as CLOB (without XML Schema).
As I mentioned before, I use Java Servlet, deployed on Tomcat WebServer, to receive XML messages from Client application via HTTP POST method.
I use these libs to get the XML payload and parse it into a Document:
import org.w3c.dom.*;
import org.xml.sax.InputSource;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
And here is the code:
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
// get the XML payload and parse it into a Document
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
Document dom;
InputSource input = new InputSource(request.getInputStream());
dom = docBuilder.parse(input);
catch(Exception ex) {
System.out.println("Exception thrown in XmlService");
ex.printStackTrace();
throw new ServletException(ex);
I create a relational table, that contains XMLType column:
CREATE TABLE xwarehouses (
warehouse_id NUMBER,
warehouse_spec XMLTYPE)
XMLTYPE warehouse_spec STORE AS CLOB;
Now I want to insert all DOM Document into XMLType column. So I do like this:
import oracle.xdb.XMLType;
String SQLTEXT = "INSERT INTO XWAREHOUSES (WAREHOUSE_ID, WAREHOUSE_SPEC) VALUES (?, ?)";
XMLType xml = XMLType.createXML(con,dom);
PreparedStatement sqlStatement = con.prepareStatement(SQLTEXT);
sqlStatement.setInt(1,2);
sqlStatement.setObject(2,xml);
sqlStatement.execute();
sqlStatement.close();
dom is the Document, that I got from HTTP Request input stream.
My servlet throws an exception:
java.lang.NoClassDefFoundError: oracle/xml/parser/v2/XMLParseException
at XmlService.GetMatListServiceHandler.processRequest(GetMatListServiceHandler.java:111)
at XmlService.XmlServiceHandler.handleRequest(XmlServiceHandler.java:43)
at XmlService.XmlServiceServlet.doPost(XmlServiceServlet.java:69)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:716)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
why does he needs oracle.xml.parser.v2.XMLParseException? I don't use Oracle parser? Does this code line throws the exception (I am not able to debug my code, because I have not configured JDeveloper to be able to use Remote Debuging):
XMLType xml = XMLType.createXML(con,dom);
Does it reparses the given dom Document or what?. When I deploy xmlparserv2.jar to Tomcat, everything is ok, application inserts XML data into XMLType column.
Is there another way to insert the whole org.w3c.dom Document or Document fragment (that is already parsed) into XMLType column. Can you provide any sample code?
The Document may contain national symbols, so they should be correctly stored and then later retrieved.
Many thanks.