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Remember that the Interface Model exposes your Domain Model via an API that can be used by the view logic to build your user interfaces. These are the most basic components that make up the Interface Model infrastructure. Reaction already ships with some commonly used Interface Model components, and the number of these can be expected to grow in the future. The Domain Models that are exposed by your Interface Model can vary in shape, size, and type. They can be records from your storage layer, objects that simply operate on data given to them, or even something as basic as your user s session. The sections that follow briefly describe the basic Interface Model components.

How is it possible that the EVALUATION column of the REGISTRATIONS table accepts null values, in spite of the constraint R_EVAL_CHK (see Listing 7-11) Answer: This is caused by three-valued logic A CHECK constraint condition can result in TRUE, FALSE, or UNKNOWN Moreover, a CHECK constraint reports a violation only if its corresponding condition returns FALSE..

Figure 5-1. The Creation date radio button modifies a field so that it records the date a record is loaded.

Note This implies that you always need an explicit NOT NULL constraint if you want your columns to be mandatory; a CHECK constraint as shown in Listing 7-11 is not enough.

These are the objects or entities your application s users will be provided with, such as images or profiles. The Object Interface Model is also the base class for collections.

Edit date: This is the date when a record is edited. It s useful for tracking changes made by a specific user on a specific date. Each time a user makes an edit to a record, the date, the user s login, and an alphanumeric identifier assigned to the edit are recorded in this field. Multiple edits are entered as separate lines in the field: 20060319 201956 Eas [IMYM2B-1] BCampbell; 20060319 201159 Eas [ZAVHA8-1] BCampbell; 20060319 191854 Eas [BMRRXD-1] JJones; Because the data is alphanumeric (not just a date value), you should set the data type for this field to PARAGRAPH. Subsequent edits to the same record will be written as separate line items in this field. Like the CDATE field described earlier, you can set this field to autopopulate from Concordance s Edit Validation menu. When an edit field is configured in this way, one line will be inserted into the field at the time of loading, as appending new records to a database is considered to be a valid edit (see Figure 5-2). EDATE is an appropriate name for this type of field.

6. If you define a PRIMARY KEY or UNIQUE constraint, the Oracle DBMS normally creates a unique index under the covers (if none of the existing indexes can be used) to check the constraint. Investigate and explain what happens if you define such a constraint as DEFERRABLE. Answer: If you define PRIMARY KEY or UNIQUE constraints as DEFERRABLE, the Oracle DBMS creates nonunique indexes. This is because indexes must be maintained immediately. Therefore, indexes for deferrable constraints must allow for temporary duplicate values until the end of your transactions. 7. You can use function-based indexes to implement conditional uniqueness constraints. Create a unique function-based index on the REGISTRATIONS table to check the following constraint: employees

are allowed to attend the OAU course only once. They may attend other courses as many times as they like. Test your solution with the following command (it should fail): SQL> insert into registrations values (7900,'OAU',trunc(sysdate),null); Hint: You can use a CASE expression in the index expression. Solution 7-7. SQL> create unique index oau_reg on registrations 2 ( case course when 'OAU' then attendee else null end 3 , case course when 'OAU' then course else null end ); Index created. SQL> The trick is to create a function-based index on (ATTENDEE, COURSE) combinations, while ignoring all non-OAU course registrations. Here s the test: SQL> insert into registrations values (7900,'OAU',sysdate,null); insert into registrations values (7900,'OAU',sysdate,null) * ERROR at line 1: ORA-00001: unique constraint (BOOK.OAU_REG) violated SQL>

s Note Creation date and Edit date values are written into the fields at the time that data is imported

Collections are a grouping of Interface Model objects. To Reaction, there is not much difference between an object and a collection in the Interface Model. While collections can be introspected the same way, Reaction already ships with many components that ease the use of collections.

Note Notice the Oracle error message number for the unique constraint violation: 00001. This must have been one of the first error messages implemented in Oracle!