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n s 9 and 10, we discussed how to query and modify Oracle objects in JDBC either as weakly typed Struct (or its Oracle implementation STRUCT) objects or as strongly typed custom classes generated by JPublisher In this chapter, we will continue the discussion for Oracle collections and references I provided a brief introduction to Oracle collections in the section Collections (Nested Tables and Varrays) of 8 of this book As far as references go, I will give a brief introduction to them in this chapter, along with how to access them using JDBC Very briefly, references are pointers to already existing rows in an object table For more detailed background information, I encourage you to consult Oracle Database Application Developer s Guide Object Relational Features (10g Release 1).

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The procedural logic may represent business logic that requires data from other external data sources Obviously, this is much easier if the code is in the middle tier and can use ADONET to access a variety of data sources Related to the previous case, you may wish to allow an easy transition to another database server in the future Clearly, having a significant amount of logic contained within a SQL Server 2005 database complicates any transition to another type of database Again, in this scenario, placing the code in middle tier components is the better option As the preceding points show, SQL Server 2005 s CLR Integration feature does not render middle-tier components obsolete This question, though, of where best to place data-oriented procedural logic is not new; it is simply a continuation of the age-old debate between T-SQL stored procedures and middle-tier business objects.

In this chapter, following the conventions of the Oracle documentation, the term collection is used when discussing nested tables and varrays in the database, and the term array is used when discussing their manifestation in JDBC programs An important point to note is that inside the Oracle database, there may be many differences between nested tables and varrays (as discussed in 8), but there is no difference in terms of the JDBC code that we need to write in order to access or modify them Both nested tables and varrays map to an array in JDBC, so the same code should work for both This chapter examines the following topics: How to retrieve collections in the database as a weakly typed javasqlArray (or its Oracle extension, oraclesql.

Wires page events that follow the Page_ naming convention automatically if true (default). If false, event handlers need to be wired explicitly. Specifies the path to the code-behind file. Specifies the name of the class that goes together with the page. Specifies the language used for writing inline code in the page. Opens a namespace specified by the Namespace attribute and makes it available to all code in the page.

In other words, the issues and concerns that affect your choice between CLR Integration and the middle tier are essentially the same as those that affect your choice between T-SQL stored procedures and the middle tier The primary difference when you re considering CLR Integration versus the middle tier is that you no longer need to factor the awkwardness, difficulty, and performance concerns of expressing the procedural logic in T-SQL So, generally speaking, if you would otherwise feel comfortable implementing the logic in a T-SQL stored procedure, then using CLR integration and a managed language is an appropriate solution..

ARRAY) object How to retrieve collections as a strongly typed array of custom class objects (generated using the JPublisher utility) Some of the Oracle extensions designed to improve performance with suitable benchmarks What references are and why they should, in general, be avoided How to access and manipulate references from JDBC.

Registers a user control for use with the page. See the section Creating Custom ASP.NET Server Controls later in this chapter. Declaratively controls caching; if present, ASP.NET keeps the rendered output of a page or a control in a cache for a specified amount of time. References an external assembly. The Name attribute can be used to specify the name of the assembly (without the extension). Specifies that the page implements the interface specified in the Interface attribute. Associates another page or user control with the current one. The Control, Page, or VirtualPath attribute can be used to identify the component to be referenced, causing it to be compiled together.