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For those of you with keen eyes, you might have noticed that the CommandText property of testCommand was changed. Instead of specifying column names or a batched query, the CommandText was changed to accept all columns including the primary key by specifying * for the columns. This is where the magic occurs. The primary key in the result set causes FillSchema to set a UniqueConstraint on the necessary column, and thus prevents the DataAdapter from filling in incorrect data. This can be seen in the schema in Listing 7-19. Listing 7-19. Primary Key Specified in the Schema <xs:unique name="Constraint1" msdata:PrimaryKey="true"> <xs:selector xpath=".//Table" /> <xs:field xpath="UserID" /> </xs:unique> <xs:unique name="Table1_Constraint1" msdata:ConstraintName="Constraint1" msdata:PrimaryKey="true"> <xs:selector xpath=".//Table1" /> <xs:field xpath="PermissionID" /> </xs:unique> Thus, you can see that FillSchema allows you to preserve your data sanctity by filling in a schema for you right from the database. It alleviates the need for you to write complex XSD schemas. It also makes your life easier by not requiring you to keep the XSDs in sync with the database, as the database structure might change with time. Though in a production application, you d probably do better if you store/cache the schemas somewhere and not execute FillSchema for every new DataSet creation.

valid ()

In Figure 8-2 you can see how the blog manager index page now looks after an archive link in the left column has been clicked. Note the status message at the top of the right of the picture, while at the bottom Firebug shows that a background request is running.

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So you re able to refresh your disconnected data cache by specifying a schema right Well, this approach is simplistic, akin to a frictionless surface used in a physics book Too bad in the real world a frictionless surface doesn t exist Before I start discussing a surface with friction in the real world, I should mention that the following paragraphs talk about updating data and concurrency These topics are covered in s 9, 10, and 11, so if this seems like too much information to digest at this point, you can come back and read this section later.

valid runs validate and validate_on_create or validate_on_update. It returns true if no errors were detected and false if there were validation errors.

Figure 8-2. The blog manager index when an archive link is clicked We have now completed the Ajax functionality on the blog manager monthly summary page. The way we have implemented it works very well, because of the following reasons: It is easy to maintain. We are using the same Smarty template for both the non-Ajax and Ajax versions, meaning to change the layout we need to modify only this one file. The code is clean. There is almost no clutter in our HTML code for the extensive JavaScript code that is used. The only code is a single call to instantiate the BlogMonthlySummary class. The page is accessible. If the user doesn t have a JavaScript-enabled browser (or disables JavaScript), they are not restricted from using this section in any way. It is simply enhanced for users who do use JavaScript. The page is scalable. An alternative method to loading the posts by Ajax would be to preload them and place them in hidden containers on the page. This works fine for a small number of posts, but once you hit a larger number, the page takes much longer to load and uses more memory on your computer. It tells the users what is happening. By adding the message container, the user knows that something is happening when they click an archive link, even though the browser doesn t start to load another page.

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