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Listing 2.5
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The differences between the two are primarily due to the manner in which they are internally managed by O8. A VARRAY must always have a specific size limit. If the size of the ARRAY is smaller than 4000 bytes, O8 stores the VARRAY directly inside the table in which it is defined. Otherwise, 08 will create a binary large object for separate storage of the VARRAY. VARRAYs are also ordered and the contents are dense. This means that all elements from the beginning to the end of the VARRAY must be filled. Individual elements of a VARRAY cannot be deleted. To update a VARRAY, the entire collection must be replaced with a new collection. Nested tables do not have an upper bound on the size limit. Nested tables are sparse, allowing individual elements to be deleted and inserted at any point in the table. A nested table is always stored as a table separate from the table in which it is defined. Unlike VARRAYS, a nested table can be indexed. The choice of using a VARRAY or nested table therefore depends on application needs. VARRAYS are better for smaller, ordered collections that do not require frequent changes. Nested tables are better for larger collections that are more volatile in nature. In the School Database example, VARRAYS and nested tables are used to illustrate the way in which each collection type is defined and accessed. To illustrate the use of a nested table, return to the definition of the persons table in Listing 2.3. A nested table is used in this example to store the clubs that a faculty member advises. Initially, clubs_table is defined as a table of REFs to campus_club objects. The clubs_table type is then used in the person type definition to define the type of the Advisor_of attribute. In the table definition statement for the persons table, the phrase "NESTED TABLE "ADVISOR_OF" STORE AS advised_clubs" is included to create the internal name of the table space that will be used to store the actual nested table. Definition of the persons_array and clubs_array VARRAYS is complicated by the fact that recursive references exist. For example, Figure 2.2 shows that Students are members of CampusClubs and CampusClubs have Students as members. Since we want a person type to have a VARRAY of REFs to campus_club and we want campus_club to have a VARRAY of REFs to the person type, the types have to be incrementally introduced and refined. In particular, we must create the types campus_club and person as incomplete object types, allowing the creation of the VARRAYs of REFs for each type. The sequence of definitions is shown in Listing 2.6. As shown previously in Listing 2.3, the full definition of the object type person includes the Member_of attribute of type clubs_array. The full definition of the object type campus_ club in Listing 2.2 includes the Members attribute of type persons_array. Because of the VARRAY definitions, there can be at most 50 members in a given club, and there can be
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CREATE OR REPLACE TYPE campus_club / CREATE OR REPLACE TYPE clubs_array as VARRAY(15) of REP campus_club / CREATE OR REPLACE TYPE person CREATE OR REPLACE TYPE persons_array as VARRAY(50) of REF person Listing 2.6 Recursive VARRAY definitions.
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at most 15 clubs to which a person belongs. After the recursive definitions in Listing 2.6, clubs_array and persons_array are holding types that have not yet been declared as objects. After the necessary array types have been created as in Listing 2.6, we can define the campus_club and person object types as shown in Listings 2.1 and 2.2, respectively. To illustrate the use of VARRAYS and nested tables, Listing 2.7 shows a function that, given a specific person and club object, determines if the person is associated with the club. The use of DEREF transforms the to_person object reference into a tuple of type person, thus allowing access to the attributes of a person object rather than just the object identifier. If the person is a Student, then the code iterates through the Member_of VARRAY to determine if the student is a member of the club. If the person is a Faculty member, then the code iterates through the Advisor_of nested table to determine if the faculty member is an advisor of the club. O8 provides features such as COUNT, FIRST, and LAST for accessing the elements of VARRAYS and nested tables.
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