.NET/Java PDF, Tiff, Barcode SDK Library

Various tools exist to assist application architects in designing their data layer. On a logical level, entity-relationship (ER) models provide a visual representation of data tables and their relationships, showing table fields, primary and foreign keys, and various constraints. Visual

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The statement string for the update simply sets the reference column manager to the passed value. Later, we use the method setRef() of the PreparedStatement interface to carry out the actual update. In this case, we effectively change the data so that Jack reports directly to Larry instead of reporting to John. String updateStmtString = "update emp_table_with_ref e" + " set e.manager = " + " where e.emp_no = "; PreparedStatement pstmt = null; try { pstmt = conn.prepareStatement( updateStmtString pstmt.setRef( 1, newManagerRef ); pstmt.setInt( 2, empNo ); pstmt.execute(); } finally { JDBCUtil.close( pstmt); } } } //end of program

Studio simplifies the design process and supports visual modeling, so let s take a brief look at how you can exploit its capabilities. In the previous section, you used Visual Studio to create an SQL Server database called company, and earlier you saw how to create a table to store data about employees. We now want to extend this database with a new table that stores addresses and link the existing Employees table to it to enable us to store an optional address record for each employee. This means we allow multiple employees to live at the same address, but not multiple addresses for a given employee. You can start by creating the Addresses table by right-clicking Add New Table from the Tables list item in Server Explorer Data Connections under the company database. You should add the columns shown in Figure 15-3.

Summary

If the configuration is set to use Windows security within the ASP.NET Framework (and anonymous access is off at the IIS level), this method loads the user name out of the server variables and creates an instance of the Windows Principal to populate the User property of the context. If the configuration is set to use Forms-based authentication, this module verifies the existence of the authentication ticket and redirects the user to the login page if it s not present. The EndRequest trap deals with a redirect to the originally requested URL after the user first logs in. You can leverage Passport authentication using the Passport SDK. (See 5 for details.) The Role Manager allows the membership provider to store a role-based resource authorization. PreAuthorizeRequest populates the user object with the roles by loading the roles for the user through the membership API. EndRequest saves this information as a cookie, so it doesn t have to be reloaded with each request.

In this chapter, we learned how to materialize collections (nested tables and varrays) in a JDBC application as Java objects. We looked at various JDBC standard classes and Oracle extensions. We learned how to use collections in JDBC program using weakly typed classes and strongly typed custom classes generated by JPublisher utility. We also learned about various performance extensions that Oracle provides you with and measured their effectiveness on data retrieval speeds. Finally we learned what references are, and why you should avoid them in general. We also learned how to query and update them using weakly typed Ref and REF classes or using strongly typed custom classes created either manually or using JPublisher utility.