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ViewPorts: A ViewPort is an abstraction that represents the application s UI logic ViewPorts provide all the business logic and data needed to interact with the user and render a specific piece of the application UI Every ViewPort has a location a string that uniquely identifies the ViewPort and allows Reaction to find it in the ViewPort hierarchy Event system: An event is a signal that notifies the application when any interaction occurs It s handled by the ViewPort responsible for the region of the UI where the interaction took place Reaction automatically maps events into ViewPort methods and parameters, and dispatches them to the correct ViewPort, based on its location..

1. Listing 7-5 defines the constraint E_SALES_CHK in a rather cryptic way. Formulate the same constraint without using DECODE and NVL2. Solution 7-1a. Solution 1 check ((job = 'SALESREP' and comm is not null) or (job <>'SALESREP' and comm is null) )

Note that the format of DATE fields can cause some confusion when load files are delimited. Although it s possible to view dates in different formats in Concordance (MMDDYYYY, YYYYMMDD, DDMMYYYY), the actual date data in delimited load files must be uniform across the entire file, even if several fields contain date data. In other words, when data is in a database, you re free to modify how it s displayed, but when dates are initially loaded, their format must be consistent. To simplify administrative procedures, that format should be consistent across separate load files.

Solution 7-1b Solution 2 check ((job = 'SALESREP' or comm is null) and not (job = 'SALESREP' and comm is null) ) 2 Why do you think the constraint E_DEPT_FK (in Listing 7-7) is created with a separate ALTER TABLE command Answer: You must define this constraint with an ALTER TABLE command because you have a chicken/egg problem A foreign key constraint can refer to only an existing table, and you have two tables (EMPLOYEES and DEPARTMENTS) referring to each other 3 Although this is not covered in this chapter, try to come up with an explanation of the following phenomenon: when using sequences, you cannot use the pseudo column CURRVAL in your session without first calling the pseudo column NEXTVAL Answer: In a multiuser environment, multiple database users can use the same sequence generator at the same time.

Widgets: A Widget contains rendering logic for a given ViewPort and provides a communication layer between the ViewPort and the templates. Widgets decide what bits of the templates and what data to render for each given ViewPort state. Layouts: A Layout is a template definition used by the Widget in order to render a piece of the ViewPort. Layouts are packaged in files called LayoutSets. LayoutSets can inherit from each other, which means you can override any given Layout in the set.

Often overlooked in database design, administrative fields can be of considerable use to the maintenance of Concordance databases. You can configure the following fields so that they autopopulate during loading: Creation date: This is the date when a record is loaded. It s useful for isolating batches of records from a specific date. During database design, a field that has been given a DATE data type can be set to autopopulate with the current system data from Concordance s Edit Validation menu (see Figure 5-1). CDATE is an appropriate name for this type of field.

Therefore, they will be using different CURRVAL values at the same time; that is, there is no database-wide current CURRVAL value On the other hand, NEXTVAL is always defined as the next available sequence value 4 Why is it better to use sequences in a multiuser environment, as opposed to maintaining a secondary table with the last/current sequence values Answer: A secondary table will become a performance bottleneck Each update to a sequence value will lock the corresponding row The next update can take place only after the first transaction has committed In other words, all transactions needing a sequence value will be serialized Sequences are better because they don t have this problem With sequences, multiple transactions can be served simultaneously and independently 5.