Apple WebObjects 3.5 Manual de usuario descargar pdf (Pagina 85)

Reﬁning Main.wo

group’s selected object. These changes happen only in memory—not

in the database. To actually insert a new row in the database (or delete

a row), the user must click the “Save to database” button, invoking

saveChanges on the session’s EditingContext. The editing context

analyzes the enterprise objects in memory; determines if any objects

have been added, updated, or deleted; and then executes database

operations to sync the database with the application.

Reﬁning Main.wo

You may have noticed that your application doesn’t list fetched movies in

any particular order. Also, when you insert a new movie, it appears in the list

of movies as a blank line.

In this section you’ll tidy up the user interface to ﬁx these things and a few

others. Speciﬁcally, you’ll:

• Conﬁgure

movieDisplayGroup to sort the movies it displays.

• Assign default values to new Movie objects.

• Change the way that dates and numbers are displayed.

You can also put the query part of the page in a table and capitalize

Main.wo’s text ﬁeld labels—for example, use “Title” instead of “title”

and “Date Released” instead of “dateReleased.”

A newly inserted movie doesn’t have

a title set, so it appears in the list

of movies as a blank line.

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Apple WebObjects 3.5 Manual de usuario Pagina 85