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Web Services in Oracle Database 10 g and beyond PowerPoint Presentation
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Web Services in Oracle Database 10 g and beyond

Web Services in Oracle Database 10 g and beyond

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Web Services in Oracle Database 10 g and beyond

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  1. Session id: 40064 Web Services in Oracle Database 10g and beyond Ekkehard RohwedderManager, Web Services Oracle Corporation

  2. Content • Motivation • Web Services (An overview from 10,000 feet) • Consumed by the Database: Web Service call-outs • Installation • Java and PL/SQL clients • The Database Provides: Web Service call-ins • PL/SQL and Java • DML and Queries • Database Grid Services • Conclusion

  3. Motivation – Who are you? • Are you writing programs in the Database? Using SQL, PL/SQL, or Java? • Then you may want toconsume external Web Services • E.g. weather, stock prices, tax tables, products, genome data • E.g. as SQL query data sources=> Enterprise Information Integration:=> Can use table functions to virtualize Web Services as tables

  4. Motivation – Who are you? • Want to get to Resources in Database?By using Web Services? • Then you want toprovide Database Web Services • E.g. weather, stock prices, tax tables, products, genome data • E.g. PL/SQL packages and Java stored procedures; XML, MultiMedia; messaging capabilities

  5. Content • Motivation • Web Services (An overview from 10,000 feet) • Consumed by the Database: Web Service call-outs • Installation • Java and PL/SQL clients • The Database Provides: Web Service call-ins • PL/SQL and Java • DML and Queries • Database Grid Services • Conclusion

  6. Web Services– An Overview from 10,000 feet An application or component with Three Things: • a URI • interacts through XML via internet • interfaces/binding described in XML

  7. Web Services– An Overview from 10,000 feet Three Specifications • SOAP – the XML-based message protocol • WSDL – the service description • UDDI – the Web Service “phone directory”

  8. Web Services– An Overview from 10,000 feet • Service Consumer • connect Firewall http://www.myserver.com/a/b • Service Provider • package and deploy

  9. Web Services– An Overview from 10,000 feet • Service Consumer • connect • invoke service/methods <se:Envelope xmlns:se=“http://schemas.xmlsoap.org/soap/envelope/” se:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/”> <se:Body> <Add xmlns="urn:add-operation"> <arg1>20</arg1> <arg2>20</arg2> </Add></se:Body> </se:Envelope> Invoke: XMLSOAP message Firewall http://www.myserver.com/a/b • Service Provider • package and deploy • implement

  10. Web Services– An Overview from 10,000 feet Service Consumer UDDI Repository • connect • invoke service/methods <wsdl:definitions> <wsdl:types></wsdl:types> <wsdl:message></wsdl:message> <wsdl:portType></wsdl:portType> <wsdl:binding> <wsdl:operation></wsdl:operation> </wsdl:binding> <wsdl:service></wsdl:service> </wsdl:definitions> Publish WSDL • Service Provider • implement • package and deploy • describe and publish

  11. Web Services– An Overview from 10,000 feet • Service Consumer • find/locate • bind • connect • invoke service/methods UDDI Repository Get or Locate WSDL <wsdl:definitions> <wsdl:types></wsdl:types> <wsdl:message></wsdl:message> <wsdl:portType></wsdl:portType> <wsdl:binding> <wsdl:operation></wsdl:operation> </wsdl:binding> <wsdl:service></wsdl:service> </wsdl:definitions> • Service Provider • implement • package and deploy • describe and publish

  12. Web Services– An Overview from 10,000 feet • Service Consumer • find/locate • bind/connect • invoke service/methods UDDI Repository 2- Get or Locate WSDL, Bind “Shortcut” 3-Connect, Invoke SOAP 1-Publish WSDL • Service Provider • implement • package and deploy • describe and publish

  13. Content • Motivation • Web Services (An overview from 10,000 feet) • Consumed by the Database: Web Service call-outs • Installation • Java and PL/SQL clients • The Database Provides: Web Service call-ins • PL/SQL and Java • DML and Queries • Database Grid Services • Conclusion

  14. Consumed by the Database– Web Service call-outs OracleDatabase Get WSDL and bind • Service ConsumerJava and PL/SQL • bind • connect • invoke service/methods “access external Web Services from DB code: stock quotes, weather info, Web search, scientific data, enterprise data, etc.” • Service Provider • implement • package and deploy • describe and publish Connect, invoke SOAP

  15. Web Service Call-Outs Oracle Database SQLEngine Dyn Inv Itf Java WS Client Stack PL/SQL Wrapper Java Client Proxy TableFunction Connect, invoke SOAP • Service Provider • implement • package and deploy • describe and publish

  16. Web Service Call-Outs - Installation • Preloaded in Oracle 10g Database JVM • initdbws.sql script (under [OH]/sqlj) • loads utl_dbws_jserver, sqljutl JAR files • creates SYS.UTL_DBWS package • JAX-RPC client stack for Web Services in JavaVM • grant java.net.SocketPermission to users of WS client library

  17. Web Service Call-Outs – Java Clients • Using Dynamic Invocation Interface:Service s = factory.createService(serviceQname); // Note: can also consume a WSDL documentCall call = service.createCall(portQname);call.setTargetEndpointAddress(endpoint); call.setProperty(…,…); …call.setReturnType(returnTypeQname);call.setOperationName(opQname); call.addParameter(pname, ptype, pmode);Object[] params = { … };Object result = call.invoke(params);

  18. Web Service Call-Outs – Java Clients • Generate static client proxy with JPublisher jpub -proxywsdl=WSDL-location -user=user/pwd • Creates static JAX-RPC client-proxy code • Loads Java code into the database • Invoke via client interface CInterf itf = new Client_Impl().getCInterfPort());((Stub)itf). _setProperty(…,…); …StringHolder p_inout = new StringHolder(“…”);Integer result = itf.operation(p_inout, p_in);…

  19. Web Service Call-Outs – PL/SQL clients • Dynamic PL/SQL clients use UTL_DBWS packagesvc := UTL_DBWS.createService(WSDLLocation);call := UTL_DBWS.createCall(svc, operation);retval := UTL_DBWS.invoke(call, args);outargs := UTL_DBWS.get_output_values(call); • uses ANYDATA to represent argument values (primitive types only) • all names are qualified • explicitly close services and calls when done

  20. Web Service Call-Outs – PL/SQL clients • Static PL/SQL clients (packages) are automatically created by JPublisher • generation of Java “glue” to expose static Java methods • generation of PL/SQL package call-specs • generation of SQL object types for complex arguments • installation of Java and PL/SQL code into database • Can be invoked from SQL and from PL/SQL code • SELECT WS_PACK.WS_OP(...) FROM ... • BEGIN ... x := WS_PACK.WS_OP(...); END;

  21. Content • Motivation • Web Services (An overview from 10,000 feet) • Consumed by the Database: Web Service call-outs • Installation • Java and PL/SQL clients • The Database Provides: Web Service call-ins • PL/SQL and Java • DML and Queries • Database Grid Services • Conclusion

  22. The Database Provides- Web Service Call-Ins • Database Capabilities • PL/SQL and Java Stored Procedures • SQL queries and DML • XML capabilities (XDB) • Advanced Queueing (AQ) and Streams • Access from JDBC=> now through Web Services

  23. The Database Provides- Application Server Hosts Web Service • Service Consumer • find/locate • bind/connect • invoke service/methods Get WSDL and bind OracleDatabase OracleApplication Server Connect, invoke SOAP • Hosted as J2EEWeb Service • delegate • package and deploy • describe and publish Service Implementation(PL/SQL, SQL, Java, XML, AQ, …) JDBC

  24. Web Service Call-Ins • Oracle Application Server framework • J2EE-based, JAX-RPC Web Services=> deployment, security, management • Tools • JDeveloper, Enterprise Manager • Web Services Assembler (JPublisher), DCM Control

  25. Web Service Call-Ins • Web Services Assembler configuration • PL/SQL package, Java class, or SQL statement that is to be exposed; data source at runtime • connection information for Java code generation • name and package of generated Java class • Web context • EAR deployment, securing, UDDI publishing • Enterprise Manager or DCM Control • Use JDeveloper wizard to automate task • browse connection, right click over package and publish as Web Service

  26. Web Service Call-Ins– Web Services Assembler configuration <db-port> <uri>/statelessSP</uri><schema>scott/tiger</schema> <!-- db schema --><db-conn>jdbc:oracle:thin:@host:5521:sqlj</db-conn> <!-- db connection --> <datasource-location>jdbc/ds</datasource-location>   <!– runtime datasource --><port-name>Company</port-name> <!-- Java interface --> <prefix>acme</prefix> <!-- Java package -->… the database resource that is published as a Web Service … </db-port> • Invocation: java -jar wsa.jar -config config.xml

  27. Web Service Call-Ins– PL/SQL packages • … the database resource that is published … == <plsql-package><!-- db package to be exposed --> <name>Company</name><!– optional: methods to expose --> <method>method1</method> <method>method2</method> </plsql-package>

  28. Web Service Call-Ins– Java classes in the DB • … the database resource that is published … == <db-java><!– server-side Java class to be exposed --> <name>foo.bar.Baz</name><!– optional: methods to expose --> <method>method1</method><method>method2</method> </db-java> • Will expose public static methods with serializable arguments.

  29. Web Service Call-Ins– PL/SQL packages and Java classes • Automatic support for PL/SQL types: BOOLEAN, record, and table types.Generation of SQL object types as necessary • Native Java calls use Java serialization over JDBC • OUT and IN OUT arguments supported in generated Java code • holder classes in 10g JAX-RPC • JavaBeans in 9.0.4 stack • JPublisher generates Java wrapper classes – this is useful by itself outside of DB Web Services

  30. Web Service Call-Ins– SQL Queries and DML statements • … the database resource that is published … == <sql-statement><operation> <!-- a SQL Query --> <name>getEmp </name> <statement>select ename from emp where ename=:{myname VARCHAR} </statement></operation> <operation> <name>updateEmp</name> <!-- SQL DML --> <statement>update emp SET sal=sal+500 where ename=:{theName VARCHAR}</statement></operation> </sql-statement>>

  31. Web Service Call-Ins– SQL Queries and DML statements • :{myname VARCHAR} is a SQL host variable • DML statements automatically committed / rolled back. Provide a batch (array) API as well • SQL queries / REF CURSOR arguments mapped to • structured data (JavaBean format), or • WebRowset or SQL/XML formats • SYS.XMLTYPE mapped to XML subtrees

  32. Content • Motivation • Web Services (An overview from 10,000 feet) • Consumed by the Database: Web Service call-outs • Installation • Java and PL/SQL clients • The Database Provides: Web Service call-ins • PL/SQL and Java • DML and Queries • Database Grid Services • Conclusion

  33. Database Grid Services • GRID = efficient utilization of resources • GRID infrastructure defined by GGF (Global Grid Forum) is based on Web Services technologies • DAIS Working Group in GGF(Database Access and Integration Services WG): • databases become GRID resources • generic access mechanism: “XML version of JDBC” • distribution of results

  34. Database Grid Services • DAIS Specification – generic access=> standard way for accessing the DB via XML=> distribution mechanism – leveraging DB capabilities of Advanced Queueing, Streaming • server-side XML support further integrated with DBWS • support for asynchronous invocation and notification mechanisms for DBWS • full JDeveloper support (today: PL/SQL call-in)

  35. Content • Motivation • Web Services (An overview from 10,000 feet) • Consumed by the Database: Web Service call-outs • Installation • Java and PL/SQL clients • The Database Provides: Web Service call-ins • PL/SQL and Java • DML and Queries • Database Grid Services • Conclusion

  36. Conclusion Database Web Services is • invoking database APIs such as SQL, PL/SQL, and Java through Web Services • re-use PL/SQL and Java stored procedures • utilize SQL queries and DML statements • handle result sets, XML documents, Relational, Text, Spatial, Binary and Multi Media data • accessing external Web Services as SQL data sources from Java and PL/SQL database code

  37. Conclusion • JAX-RPC client in Oracle JavaVM for call-outs • Oracle Application Server for DB call-ins • create, deploy, secure, and publish Web Services • JDeveloper IDE • Oracle Enterprise Manager • command line: Web Service Assembler (with JPublisher), DCM Control

  38. Conclusion – What Next… • Visit the Oracle Database Web Services demo on the DEMOgrounds • Visit the Web Services pages on OTNhttp://otn.oracle.com • Download the 10g Oracle Application Server preview with JAX-RPC Web Services

  39. Q & Q U E S T I O N S A N S W E R S A