Home » Oracle » 1z0-419 v.2 » Which three statements are true about declarative features of view objects?
Which three statements are true about declarative features of view objects? (Choose three.)
A. You can use view object bind variables to parameterize a view object where clause with values supplied at run time.
B. By default, a view object instance retrieves all database rows into the view object cache.
C. To implement master-detail behavior between two view object instances, you define an association between those instances.
D. A view accessor defines a validation expression that you apply to a view object attribute.
E. A view object can include attributes whose values are based on SQL expressions rather than mapping directly to a database column.
F. A view object definition can include many view criteria but you can choose which view criteria to apply for each view object instance.
Correct Answer: ACE
Explanation/Reference:
A: Declarative view objects, those are view objects that don’t actually specify a hard coded query. Instead ADF creates their query at runtime, and it does it based on the data that is requested in your UI layer. This can be a huge saver of both DB resources and network resources.
C: Just as with normal mode view objects, you can link view objects that you create in declarative SQL mode to other view objects to form master-detail hierarchies of any complexity.
E: At runtime, when ADF Business Components works with JDBC to pass a query to the database and retrieve the result, the mechanism to retrieve the data is the SQL query. As an alternative to creating view objects that specify a SQL statement at design time, you can create entity-based view objects that contain no
SQL statements. This capability of the ADF Business Components design time and runtime is known as declarative SQL mode. When the data model developer works with the wizard or editor for a view object in declarative SQL mode, they require no knowledge of SQL. In declarative SQL mode, the view object’s metadata causes the ADF Business Components runtime to generate the
SQL query statements
References: http://docs.oracle.com/cd/E37975_01/web.111240/e16182/bcquerying.htm#ADFFD1992
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