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The get_director_id() function returns the ID of the given director or None if there is no such director in the database We use the fetchone() method because there is either zero or one matching record (We know that there are no duplicate directors because the directors table s name eld has a UNIQUE constraint, and in any case we always check for the existence of a director before adding a new one) The fetch methods always return a sequence of elds (or None if there are no more records), even if, as here, we have asked to retrieve only a single eld

def edit_dvd(db): title, identity = find_dvd(db, "edit") if title is None: return title = Consoleget_string("Title", "title", title) if not title: return cursor = dbcursor() cursorexecute("SELECT dvdsyear, dvdsduration, directorsname " "FROM dvds, directors " "WHERE dvdsdirector_id = directorsid AND " "dvdsid=:id", dict(id=identity)) year, duration, director = cursorfetchone() director = Consoleget_string("Director", "director", director) if not director: return year = Consoleget_integer("Year", "year", year, 1896, datetimedatetoday()year) duration = Consoleget_integer("Duration (minutes)", "minutes", duration, minimum=0, maximum=60*48) director_id = get_and_set_director(db, director) cursorexecute("UPDATE dvds SET title=:title, year=:year, " "duration=:duration, director_id=:director_id " "WHERE id=:identity", locals()) dbcommit()

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of software development is that even carefully written systems break and unanticipated scenarios occur It s the job of a good developer to ensure a balance between creating software that prevents problems and software that handles problems as they arise Distributed service-based systems are no exception In fact, service-based systems exacerbate the problem by introducing dependencies such as server availability, network conditions, and service version compatibility Exceptions are a critical component of a robust system and can be indicators of a variety of situations For example, a caller may not have provided correct or complete information to a service, a service may have encountered an issue attempting to complete an operation, or a message may be formatted according to an unsupported version In this chapter, we ll talk about the effect exceptions have in WCF and the features WCF provides for communicating and processing exceptions We ll describe the difference between exceptions and faults, the ways to create faults to send to a caller, and ways to process exceptions on both the service and caller Finally, we ll describe ways to centralize exception processing in the service host, catching unexpected exceptions or performing additional processing on exceptions and faults, such as logging

Like all Items, CustomItems have the concept of minimum and preferred sizes These sizes pertain to the total area of the Item, which includes space for the content, label, borders, and so forth (See Section 1094, "Item Sizing," for a full discussion of the areas and sizes of Items) A CustomItem does not itself fully control this area There is, however, a smaller region within the CustomItem called the content area that the CustomItem subclass paints and from which it receives input events

To edit a DVD record we must rst nd the record the user wants to work on If a record is found we begin by giving the user the opportunity to change the title Then we retrieve the other elds so that we can provide the existing values as defaults to minimize what the user must type since they can just press Enter to accept a default Here we have used named placeholders (of the form :name), and must therefore provide the corresponding values using a mapping For the SELECT statement we have used a freshly created dictionary, and for the UPDATE statement we have used the dictionary returned by locals()

We could use a fresh dictionary for both, in which case for the UPDATE we would pass dict(title=title, year=year, duration=duration, director_id=director_id, id=identity)) instead of locals() Once we have all the elds and the user has entered any changes they want, we retrieve the corresponding director ID (inserting a new director record if necessary), and then update the database with the new data We have taken the simplistic approach of updating all the record s elds rather than only those which have actually been changed When we used a DBM le the DVD title was used as the key, so if the title changed, we created a new key value item and deleted the original But here every DVD record has a unique ID which is set when the record is rst inserted, so we are free to change the value of any other eld with no further work necessary

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