Introduction of Oracle XML
Cheatsheet Oracle posesses a variety of powerful XML features. A tremendous amount of documentation exists regarding Oracle's XML features. This resource is intended to be a cheatsheet for those of us who don't have time to wade through the hundreds of pages of documentation, but instead wish to quickly understand how to create simple XML output and input XML into a database.
Gets the XML document by fetching the maximum number of rows specified. It appends the XML document to the CLOB passed in. Use this version of GETXML Functions to avoid any extra CLOB copies and to reuse the same CLOB for subsequent calls. Because of the CLOB reuse, this GETXML Functions call is potentially more efficient.
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SQL SQL is used to communicate with a database. According to American National Standards
Institute (ANSI), it is the standard language for relational database management systems. SQL statements are used to perform tasks such as update data on a database, or retrieve data from a database. Some common relational database management systems that use SQL are: Oracle, Sybase, Microsoft SQL Server, Access, Ingres, etc. Although most database systems use SQL, most of them also have their own additional proprietary extensions that are usually only used on their system. However, the standard SQL commands such as "Select", "Insert", "Update", "Delete", "Create", and "Drop" can be used to accomplish almost everything that one needs to do with a database.
Oracle XML DB and J2EE features Security Implementation
The XMLNews application has adopted Form-based-authorization to customize the user authentication interface. In form-based authentication, you can customize the login screen and error pages that are presented to the end user by an HTTP browser. Also, the content of the user dialog box is sent as plain text, and the target server is not authenticated.
In XMLNews application, authentication is only for the UI (JSPs) i.e Views layer and not for the underlying EJBs. From the security perspective, there are two types of web pages in the application; authenticated and non-authenticated pages. To access the authenticated pages, end-users have to be authenticated. In the current sample application, user validation for username/password is done against Oracle database table using custom UserManager class. Apart from the username/password validation, role validation is also done. With this, the application is implemented in such a way that content of the authenticated page will also depend on the role of the user.
The oracle XML DB and J2EE features
Web services are a set of emerging standards that describe service-oriented, component-based application architecture. Web Services enable loosely coupled, reusable software components that semantically encapsulate discrete functionality and are distributed and programmatically accessible over standard Internet protocols. Web Services as they stand today comprise of open Internet standards like WSDL(Web Services Description Language),
Simple Object Access Protocol (SOAP), and Universal Description Discovery and
Integration (UDDI). WSDL is used to describe the Web Service, UDDI is used to publish and query Web Services described in WSDL, and finally SOAP is used to invoke the Web Service. This is the common Web Services programming model.