Getting Started with IBM Data Studio for DB2

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282 Getting Started with IBM Data Studio for DB2 10.1 Data web services: The big picture Web services, in general, are standards that allow applications to share information through services on the web. There are a multitude of materials on the web about web services, and you can also refer to the ebook entitled Getting Started with Web 2.0 for more information. In summary, however, web services are designed to allow for communication between machines in a loosely coupled fashion. This can be accomplished by use of a Web Services Description Language (WSDL) XML document that provides the description required by the invoker to call the service (where is the service, what binding to use, etc) and to understand the messages (in XML) returned by the service. Data web services, in particular, refer to the ability to wrap web services around the logic provide by the database. For example, you might already have a SQL script or stored procedure that provides business logic for returning the current price of a particular item in inventory from the database. Using data web services, you are simply making it much easier for a web application (or other client) to start that capability, perhaps even as simple as putting the HTTP request in a web browser. This approach to creating a web service based on existing database operations/business logic is called “bottom up” as opposed to a to ”top down” approach in which the web services description is defined first and then logic is provided to map to that particular description. Data Studio (and Optim Development Studio) supports the development and deployment of data web services without you having to write a single line of code. Figure 10.1 provides an overview of data web services using Data Studio. Figure 10.1 - Developing data web services with Data Studio
Chapter 10 – Developing data web services 283 On the left side of Figure 10.1, you can see different database operations. For example, there is a query to return all information about an employee when an employee number is provided. There is an update statement to update the first name of an employee based on an employee number; there is a stored procedure that does some bonus calculations, and there is an XQuery that is retrieving information from an XML document. Using Data Studio, these operations can be converted to data web services without any coding on your part. A few clicks are all you need to have the data web service created for you. On the right side of the figure, you can see that Data Studio automatically creates the artifacts needed to deploy this web service, including the WSDL document, and the JAVA EE runtime artifacts such as a configuration file and the runtime package. 10.1.1 Web services development cycle Just like developing a JAVA EE application, the data web service development cycle consists of the following steps, as shown in Figure 10.2: 1. Create the service 2. Deploy the service to a JAVA EE application server 3. Test the service. Figure 10.2 – Development and deployment of a data web service As shown in Figure 10.2, after you drag and drop an operation to create a web service, Data Studio generates the corresponding web service definitions that make a data web service. The service runtime artifacts are packaged as a Java EE web application. The Java EE application is ready to be deployed into a Java EE application server. You can apply additional settings for security, monitoring, logging, and more during the deployment phase. 10.1.2 Summary of the data web services capabilities in Data Studio Here is a summary of data web services features provided by Data Studio:
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3 Notices This information was deve
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Table of contents 5 Table of conten
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3.3.1 Exporting data...............
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Preface 13 Keeping your skills curr
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around the world have participated
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17 About the authors Dimple Bhatia
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Contributors 19 The following peopl
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21 Acknowledgements The authors owe
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24 Getting Started with IBM Data St
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100 Getting Started with IBM Data S
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103 Chapter 3 - Maintaining the dat
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159 Chapter 5 - Creating SQL and XQ
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Chapter 5 - Creating SQL and XQuery
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193 Chapter 6 - Managing jobs Job m
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Chapter 6 - Managing jobs 195 6.3 J
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Chapter 6 - Managing jobs 209 6.6.2
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213 Chapter 7 - Tuning queries In t
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355 Appendix D - The Sample Outdoor
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Appendix E - Advanced topics for de
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E.5.4 Data web services artifacts A
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References 391 References [1] HAYES
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References 393 Books and articles 1
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396 Getting started with IBM Data S
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Getting Started with IBM Data Studio for DB2

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