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handled in Tapestry. The ImageSubmit component is used to generate the image button to be used for a form submission. It extends the much simpler Submit component as shown: <img jwcid="@ImageSubmit" image="asset:btn_submit" alt="Submit" src="images/submitButton.png" /> Another side effect of the rich object-oriented nature of the Tapestry component library is the amount of reuse; complex components can be created by extending or aggregating simpler components. In the ImageSubmit component we are declaring that the image will be provided by the Tapestry asset manager and that the name of the asset is btn_submit. Also, alternate text is provided in the case that the user browser has images disabled. Finally, to enable an accurate HTML static page, the actual image is presented using the src attribute. As you ll learn, assets eliminate the confusion of finding assets (resources such as images and other media) typically encountered in sites with multiple pages in multiple directories. To create an asset for the submitButton.png image, add an asset element to the Home.page definition file as shown next (which assumes that the image is in the images directory under the context directory). <asset name="btn_submit" path="images/submitButton.png" /> With the HTML template modifications in place, we need to update the Home class to satisfy the components in the template. Listing 7-10 shows the modified Home class. Listing 7-10. A More Elaborate Home.java public abstract class Home extends BasePage implements PageBeginRenderListener { private static String[] FORMAT_STRINGS = new String[] { "h:mm a", "EEE, MMM d, ''yy", "hh 'o''clock' a, zzzz", "K:mm a, z"}; public static final IPropertySelectionModel FORMAT_MODEL = new StringPropertySelectionModel(FORMAT_STRINGS); private Format timeFormat; public void pageBeginRender(PageEvent event) { if (getFormatString() == null) { setFormatString(FORMAT_STRINGS[0]); } } public Format getTimeFormat() { timeFormat = new SimpleDateFormat(getFormatString());

Note Applying a PRIMARY KEY constraint on a field also generates a unique index created on it by default. Indexes are objects that improve performance of many database operations, dramatically speeding up your web application (you ll learn more about this later in the Indexes section of this chapter).

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Execute a single line, possibly executing a function in its entirety. Step into the next function call. Continue a function until it exits and returns to the caller, stopping execution immediately after the target executes the return. Switch from source-code debugging to viewing individual assemblylevel instructions and stepping on an instruction-by-instruction level. Reverse execution flow to rerun a statement. (Of course, depending on application state, your application may not behave well after this operation!) You can also right-click a source line in the editor and choose Run to line to continue execution and run to the specified line, a handy way to skip a bunch of code you know that works and stop at a potentially troublesome spot without placing another breakpoint. In the Locals and Watchers pane of the watch window you can also edit variable contents; this is handy if you see a variable is uninitialized and you want to fix it at once and continue without having to stop execution, edit your code, recompile, and debug until you get to the same point again. Double-click the corresponding value in the value column and enter a new value (string, hexadecimal, or text). Right-clicking a line in the watch window gives you additional ways to view a variable s contents, including: Opening a memory editor at a specified address, letting you view and edit individual words in memory. Add a permanent watch point to a variable or location in memory, so it s always visible in the watch window regardless of execution context. Change the display format of strings from ASCII to Unicode or other representations.

Constraints are rules that apply to data tables and make up part of the data integrity rules of the database. The database takes care of its own integrity and makes sure these rules aren t broken. If, for example, you try to add two identical values for a column that has a PRIMARY KEY constraint, the database refuses the operation and generates an error. We ll do some experiments later in this chapter to show this.

return timeFormat; } public Date getTime() { return new Date(); } public abstract String getFormatString(); public abstract void setFormatString(String formatString); public void formSubmit(IRequestCycle cycle) { Systemoutprintln("The form has been submitted!"); } } Let s start with definition of the FORMAT_MODEL, for which we will use the simple StringPropertySelectionModel, which enables a string array to be used as the source of the labels in the drop-down and uses a simple integer index as the value A String[] containing several format strings that can be used with a javatextSimpleDateFormat instance is created and is then used in the constructor of the StringPropertySelectionModel The getFormatString method will return the value of the selected format string after a form submission This value is used in the getTimeFormat method to return a Format object The formSubmit method returns void and has an empty implementation.

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