When to use XML Column method | IBM Version 5 guide

XML Column method

The XML Column method provides the facility to store the entire XML document as is in a table column. The XML documents are inserted into table columns that are enabled for XML and can be updated, retrieved, and searched. The XML document can also be kept on the local file system and only a pointer to the document be kept in the table column.

If you want to search the XML document based on certain element or attribute values, you can map the element and attribute data from an XML document to DB2 tables called side tables. We can build indexes on these side tables to support fast structural search. Figure 5-6 gives an overview of the column method.

When to use XML Column method

We recommend using the XML Column method under the following conditions:

The XML documents already exist.

There is a requirement to archive documents. For example, a news publishing company that serves articles over the Web may want to maintain an archive of published articles, which the users can search for.

Generally read-only documents

Stores documents externally, but use DB2 for management and search.

Requirement for range-based searches on document elements.

Documents with large text blocks (no larger than 2 GB, in which case the table column cannot accommodate the document and it has to be decomposed into more columns) which require structured searches using Text Extender.

Chapter 6. RDB and XML integration 133

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IBM Version 5 manual When to use XML Column method

Contents

XML Files Page International Technical Support Organization First Edition December Contents XML Collection Contents Part 4. Appendixes Abbreviations and acronyms Page Copyright License Cics Trademarks Team that wrote this redbook PrefacePage Comments welcome Become a published authorPage Part Page XML overview Background XML concepts Information sharing XML business benefits XML within an organization XML in new innovations Technical benefits of XMLVoice XML Scalable Vector Graphics Uniformity and conformity Acceptability of use for data transferSimplicity and openness Separation of data and display Industry acceptance XML historyExtensibility XML1.0 Xslt and Web applications Web Tier Web services and XML XML, W3C, and IBM Interaction of Web services Working drafts in development RecommendationsPage Technologies in XML Tree-based parsing XML Processor parser Event-based parsing DTD and XML SchemaPage Schema and style using CSS, XSLT, and XSL Cascading Style Sheet CSS Example 2-1 a namespace example XML namespaces Example 2-2 a namespace example using namespace prefix Link and jump using XLink, XPointer, and XML Base Example 2-3 a simple link Example 2-4 An extended link XML Base Example 2-5 An example of extended links using xbase XML Pointer XPointer paths and steps XPointer range functions XPointer string functions Example 2-6 An XPath example XPath Book Library XML digital Technologies in XML Example 2-8 Encrypted Information on passenger John Smith Examples of XML encryptionExample 2-7 Information on passenger John Smith Example 2-10 Encryption of the whole document Example of a XML digital signatureExample 2-9 Encrypting only the credit card number Example 2-12 Part encryption of an XML document TransformsExample 2-11 An XML digital signature Example 2-13 The final XML document after encryption XML query language Other security specifications Path expressions Element constructors Conditional expressions if then Else FLWRFOR, LET, Where and Return clauses expression Filtering Quantifiers Querying relational data Example schema for relational database and Xquery comparison Joins Grouping in XQuery Xslt interpreters Xslt compilers Xsltc For more details, visit Using XSLTCThe Apache XML Project at Cocoon Java Architecture for XML Binding Jaxb Serializer pipeline outputs Generators and reader pipeline inputsTransformers and actions processing steps Example 2-14 Sample sitemap for Cocoon Matchers and selectors conditional processingSitemap Example 2-15 Components of a sitemap XML file Part 2 XML technology in IBM WebSphere Page Processing XML XML applications Xalan model of operation Xalan Javax.xml.transforms interfaces operation SAX2 Example 3-2 Sample event breakdown Example 3-1 Sample XML document SAX2 classes and interfaces Example 3-4 Sample namespace XML namespace supportExample 3-3 SAX2 callback methods DOM hierarchy DOM level2 Example 3-5 Sample XML document Sample generated DOM tree Jaxp Example 3-6 Sample XML to Html transformation code Using Jaxp Xslt support packages in Jaxp Stylesheet compilation Introduction to IBM WebSphere Application Developer WebSphere Studio family WebSphere Studio product family WebSphere Studio Application Developer WebSphere Studio Site Developer Advanced WebSphere Enterprise Developer WebSphere Studio Application Developer Integration Edition Web development tools Tools XML tools Relational database tools Java development tools Web services development tools Debugging tools EJB development toolsTeam collaboration Performance profiling tools Server tools for testing and deployment Plug-in project Plug-in development toolsFragment project Plug-in component Application Developer XML Tools Window-Open Perspective-XML XML perspective XML editor XML perspective editorsCreating an XML file from scratch Select the option Create XML file from scratch XML editor Editing an XML file Creating a DTD from scratch DTD editorValidating the XML file DTD Editor Using the Outline view to add DTD components Validating DTD Creating a schema from scratchXSD editor XML Schema Editor Using the Outline view to add schema components Making changes and referential integrity Pop-up on schema file in the Outline view Namespace Validating schema Creating an XSL file from scratch XSL editor Validating the XSL file Namespace supportEditing an XSL file Indicate all local elements to be qualified XPath Builder XPath support 10 XPath definition 11 XPath Operators 12 XPath functions 13 XPath Query Result screen XSL debugger 14 XSL Debugger Web service wizard Web services supportWeb Service Dadx group configuration wizard Application Developer XML Tools Page 101 RDB and XML integration Passenger List Select statement SQL to XML wizards SQL to XML wizard panel Example 6-1 XSL file for Show table columns as ‘Elements’ Show table column as optionXML and XSL files Html XML file generated with the Elements option Html file Html with the ‘Recurse through foreign keys’ unchecked Html generated for Foreign key as links option Aircraft Html generated for ‘Foreign key as links’ option XML Schema file RDB and XML integration 076/schema Sequence Example 6-4 XML Schema for Aircraft table DTD file Page Flight Cdata #REQUIRED Query template file Statement Options Example 6-9 Customer.xml XML to SQL wizard XML to SQL wizard Selecting the connection 10 XML to SQL wizard Selecting Schema and Action 11 XML to SQL wizard Selecting the column DDL to XML Schema wizard Example 6-10 XML Generated through the DDL to XML Schema 12 Generate XML Schema Restriction base=string length value=30 SimpleType Element Example 6-11 XML Schema for a single table using a Select DB2 XML Extender 13 shows an overview of the XML Extender XML Extender UDTs created Administrative support tables, UDTs, and UDFsAdministrative support tables created UDFs created Stored Procedures created DTD Repository Example 6-12 DTD representation of a book Document Access Definitions DADPage XML Column method When to use XML Column method XML Collection Elements/attributesAs is xml document 15 XML Collection Method overview When to use XML Collection method Example 6-14 Sample DTD Mapping schemes for XML collections SQL mapping Column name Data type Employee table in Sample database Empact Table in Sample database Example 6-16 The RDBnode RDBnode for the top elementnode Example 6-17 RDBnode mapping XML Extender administration toolsRDBnode for each attribute and textnode XML MQSeries enablement RDB and XML integration Page 145 Click Finish Select passengerList.dtd Right-clickGenerate-XML SchemaDTD XSD Create an XML file from a DTD file XML DTD/XSD Create an XML file from an XSD file Select Select file from Workspace option Create DTD/XSD files from XMLSelect passengerList.xsd Right-clickGenerate-XML File Example 7-1 Customer.xml Example 7-2 Customer DTD Select Customer.xml Right-clickGenerate-XML SchemaSelect customer.xml Right-clickGenerate-DTD Example 7-3 Customer.xsd Generate a Html from an XSDSelect passengerList.xsd file Right-clickGenerate-HTML Doc Select J2EE Web Application Project. Click Next JavaBeans from DTD/XSDClick File-New-Project Select passengerList.xsd Right-clickGenerate-JavaBeans Generate XML/XSL from JavaBeansSelect Generate sample test program. Click Finish Example 7-4 passenger.javaPage Input XML Form screen Click File-New-Java Bean XML Client Click File-New-Other Generate XML/XSL from Html Adding annotation tags Preparing the Html file for generation Example 7-5 cus-template.xhtml Example 7-6 Customer.xml Select cus-template.xhtml Right-clickGenerate-XSL FileSelect Customer.xhtml. Click Next Page 161 Part 3 XML application developmentPage 163 WebSphere and XML approaches XML in Application development Web services Passenger List application Solution Outline Servlet Web ServicesXML in this application Client Web Tier Development and running of the Passenger List application Technical implementation overviewPage Discussion Advantages of using the database Enterprise JavaBeans Interprise Application Server Customer Registration application Technical overview Page 177 Developing XML Web services Servlet Creating the Web tier Name Type Create the Airline simple project Create the Travel Web project Design the XML SchemaSelect File-New-XML Schema PassengerList DOM Tree Select root node Creating XML Schema XML Schema Example 9-1 PassengerList.xsd Design an output Generate XML fileHtml and mapping approach Example 9-2 Static XML file Example 9-4 html.xml source Select required and optional content, click FinishExample 9-3 html.dtd XML to Html mapping Generate an XSL file Source Target Mapping XML to Html Generating XSL from Xhtml Create an XSL from scratch Developing the servlet Testing the XSL Example 9-5 GetPassengerList Server doGet method Javax.xml.transform.Source Compiling XSL Test the passenger list applicationJavax.xml.transform.TranfrormerFactory Javax.xml.transform.Transformer 11 XML Web service Creating a Web service Click Window-Open Perspective-Data Create the database tierRight-clickNew Connection Right-clickImport to folder PassengerList.xsd-Generate-DTD Figure Generate DTD file 13 Generated DTD File Loading DTD into XML Extender Select RDB Table to XML Mapping, click Next Creating DAD file using RDB to XML mappingMembership 15 Edit Join Conditions Click Mapping-Edit Join Conditions 16 RDB to XML mapping Select passengerList.rmx DAD Extension Create the Web Service from Dadx file Dadx Group Web services and DB2 XML Extender Group.properties File Next Generating the Dadx 18 Dadx Generation Dadx operations RetrieveXML StoreXML Deploying the Web serviceExample 9-6 Updated Dadx file Example 9-7 namspacetable mapping entry 19 Web Service settings 20 Testing Web Service Test the Web Service Mapping DTDIDs to XSD namespaces and locations Modify passenger list application to use the Web Service Example 9-8 Namespaces Modifying the XSL fileExample 9-9 Changing root element Example 9-10 passengerList.xslPage Center Creating Html input form 22 Input form GetPassengerList.html Using Java proxy 23 passengerList result ConclusionPage 215 Development of XML-based Enterprise applications XML based Enterprise application architecture Multi-tier solution architecture Customer registration Solution outline for customer registration sample Customer registration scenario outline Retrieving customer information Retrieving customer data scenario outline Developing the customer registration sample JavaBean to XML client wizard Preparing to create the Web tier Creating the Web tier Customer JavaBean class specification JavaBean XML/XSL client wizard JavaBean XML/XSL client JavaBean selection JavaBean XML/XSL client methods and properties selection JavaBean XML/XSL client input form design 10 JavaBean XML/XSL client results form design Investigating the Web-tier generated files 11 JavaBean XML/XSL client prefix specificationPage Org.w3c.dom.Document ProduceDOM DocumentJava Bean XML Data Example 10-2 Source code for CustomerXSLServlet init method Development of XML-based Enterprise applications Xslt Processor Stylesheet Transformer ProduceDOMDocumentXML Document Example 10-4 Source code for the servlet doPost method Form action=/Registration/CustomerXSLServlet method=post Membership Example 10-10 Sample of CustomerResult stylesheet form Validating the Web tier Example 10-12 Schema file for the XML data 15 Customer registration form Building the entity EJB and the database schema EJB mapping approaches review Project configurationPreparing to create the entity EJB Creating the entity EJB 17 Create an Enterprise Bean wizard 18 Enterprise bean details Creating the database mapping and tables 19 EJB to RBD Mapping wizard for CustomerInfo module 20 Target database specification 21 EJB to RDB mapping editor 22 Database connection definition Access beans Creating an access bean for the entity bean Creating a Jdbc data source 23 Access Bean creation wizard 24 Data source definition for a server configuration 25 Jdbc data source definition Binding the EJB to a Jdbc data source Modifying CustomerXML Integrating the entity EJB with the Web tier Example 10-13 create source code 27 CustomerInfoWeb project properties Example 10-14 CustomerXSLServlet doPost source code Modifying CustomerXSLServlet Retrieval function Application deployment and testingExample 10-15 Retrieval function Example 10-16 Confirming the creation 28 Generating the deployed code for the EJB Testing the registration application 29 Customer Registration form Page 257 Light weight XML-based Enterprise Application SQL to/from XML libraries SQL-XML solution architecture Customer registration Light weight XML-based Enterprise Application Retrieving customer information XSL Servlet XML Document format Adding the libraries to the project Converting an XML Document XMLToSQL architecture XMLToSQL Modifying CustomerXSLServletInitializing the XMLToSQL class Example 11-1 initSQLProperties method Creating an XML DocumentModifying the produceDOMDocument method Example 11-2 ProduceDOMDocumentforTools We need to change to Example 11-3 CustomerXSLServlet doRegister method Executing the XMLToSQL class Example 11-5 The xslif tag Modifying the doPost methodExample 11-4 CustomerXSLServlet doPost method Example 11-6 Customer.XSL firstname template Adding the error case JdbcDriver Retrieving a customerStatement Format Example 11-7 initQueryProperties method Initializing the SQLToXML classSQLToXML Example 11-8 CustomerXSLServlet doQuery method Executing the SQLToXML class Example 11-10 showPage method Modifying the showPage methodExample 11-9 CustomerXSLServlet doPost method for query Example 11-12 Customer.XSL membership template Modifying the doGet methodExample 11-11 showPage method Example 11-13 Result XSL Page Customer Registration form Using datasource with SQLToXML and XMLToSQL class Getting the datasource Class definition Example 11-15 setDatasourceMethods ConstructorsExample 11-14 setDatasourceMethods Execute methods 11 Core data is an XML ConclusionPage 283 Deploying your Web application Exporting your project from Application Developer Manual deployment Starting the WebSphere AEs Admin Console Installing the EAR file on WebSphere AEs Select Enterprise Applications Installing the EAR Testing the application Creating a remote server instance Publishing to a remote server AEs Creating a remote server instance WebSphere Studio Application Developer Programming Guide Remote server instance settings Remote file transfer option Remote copy options WebSphere Studio Application Developer Programming Guide Publishing to remote server WebSphere Studio Application Developer Programming Guide 297 Part 4 AppendixesPage 299 Installing Application Developer Things to do before installation WebSphere Studio Application Developer installation Select options Selecting your workspace Programs-IBM WebSphere Studio Application Developer-IBM Verifying the installation WebSphere Studio Application Developer Programming Guide 305 Create groups and users Hardware and software prerequisites Stop the Web server processes Install WebSphere Application ServerCheck that IP ports are unused 10 Installation options 11 Security options 12 Snoop servlet accessed through embedded Web server 311 Using the Web materialLocating the Web material System requirements for downloading the Web material How to use the Web material 313 Abbreviations and acronyms OTS Referenced Web sites IBM RedbooksOther resources 315 IBM Redbooks collections How to get IBM Redbooks 317 Index Jaxp Wsaa Xacml Xsltc 48 Spine 475-0.875 250 459 pages Page Page XML Files