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When you deploy your application at a customer installation, you might sometimes choose to deploy your database as a series of SQL scripts that you can simply run on the server to rebuild the database objects required. Some developers start off by hand-coding the DDL statements manually; they then use this to generate the actual database objects used for development and testing. ODT.NET allows you to also do it the other way around. ODT.NET allows you to generate SQL scripts from existing database objects. This can sometimes be convenient; it frees you from having to manually keep track of your DDL statements every time you make changes to the database. You could visually edit your database as you wish via ODT.NET, and when the time comes for you to deploy your application, you could just generate SQL scripts from each of these database objects. Let s try to generate the SQL script for the Products table. Browse for this table in the Server Explorer window, right-click on it, and choose the Generate Create Script menu item (as shown in Figure 14-26).

This chapter considered dynamic user interfaces. Rather than limiting the discussion to questions about how to create controls at runtime and hook up their events (which, as you ve seen, is relatively trivial once you know how to do it), the chapter examined some more radical approaches. These techniques allow you to dynamically build entire interfaces to suit localization needs, changing data, or user-specific customization. Many of these applications have specific niches, and the techniques discussed here aren t suitable for all applications. On the other hand, if you need to create a data-driven or highly customizable application like the portal example in this chapter, you need to use a dynamic interface without it you ll be trapped in an endless cycle of user interface tweaking and recompiling as the underlying data change. Perhaps best of all, dynamic user interfaces give developers a chance to write innovative code and that s always fun.

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Remember the costs associated with additional indexes: higher INSERT and UPDATE times and more storage space required Make sure column types match on join conditions: Ensure that when you have two tables joined, the ON condition compares fields with the same data type MySQL may choose not to use an index if certain type conversions are necessary Ensure an index can be used: Be sure to write SQL code in a way that ensures the optimizer will be able to use an index on your tables Remember to isolate, if possible, the indexed column on the left-hand side of a WHERE or ON condition You ll see some examples of this strategy a little later in this chapter.

elp: Is it the final polish on a professional application, or a time-consuming chore It all depends on the audience, but most applications need a support center where users can seek assistance when they become confused or disoriented. Without this basic aid, you (or your organization s technical support department) are sure to be buried under an avalanche of support calls. In this chapter, you learn the following: How to integrate Windows Help files into your applications. You look at launching Help manually and using the context-sensitive HelpProvider. When to design your own Help, and how you can weave it into an application using an extensible database-based or XML-based model. How to break down the limits of Help and design application-embedded support: user assistance that s integrated into the software it documents instead of slapped in a separate file as an afterthought. You explore some simple approaches such as affordances and a few advanced techniques such as animated agents.

Figure 14-26. Generating the Create Script for the Products table When you have done this, you will be prompted to specify a location to save the generated script file. Specify a location and filename to save your script to. After that is done, you can try opening the script file in a text editor like notepad.exe. You should be able to see something similar to Listing 14-3. Listing 14-3. The Contents of the Generated Script File for the Products Table

Keep index statistics current with the ANALYZE TABLE command: As we mentioned earlier in the discussion of the scan versus seek choice available to MySQL in optimizing queries, the statistics available to the storage engine help determine whether MySQL will use a particular index on a column If the index statistics are outdated, chances are your indexes won t be properly utilized Ensure that index statistics are kept up-to-date by periodically running an ANALYZE TABLE command on frequently updated tables Profile your queries: Learn more about using the EXPLAIN command, the slow query log, and various profiling tools in order to better understand the inner workings of your queries The first place to start is 6 of this book, which covers benchmarking and profiling Now, let s look at some examples to clarify clustering key choices and making sure MySQL can use an index..

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