Download Oracle9i Application Developer's Guide - Object-Relational by Gietz B. PDF

By Gietz B.

Oracle9i software Developer's consultant - Object-Relational positive factors is meant for programmers constructing new functions or changing current functions to run within the Oracle atmosphere. The object-relational good points are frequently utilized in multimedia, Geographic info platforms (GIS), and related functions that take care of complicated facts. the thing perspectives function should be precious whilst writing new functions on most sensible of an latest relational schema.This consultant assumes that you've a operating wisdom of software programming and that you're accustomed to using based question Language (SQL) to entry details in relational database structures.

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You can do this by using a TABLE expression with the collection. A TABLE expression enables you to query a collection in the FROM clause like a table. In effect, you join the nested table with the row that contains the nested table. The TABLE expression can be used to query any collection value expression, including transient values such as variables and parameters. 2-28 Oracle9i Application Developer’s Guide - Object-Relational Features Collections Note: The TABLE expression takes the place of THE subquery expression.

For example, specialized types of customers—a corporate Customer type or a government Customer type—might be derived from a general Customer object type. The specialized types can add new attributes or redefine methods inherited from the parent. The resulting type hierarchy provides a higher level of abstraction for managing the complexity of an application model. Type Evolution Using an ALTER TYPE statement, you can modify—"evolve"—an existing user-defined type to make the following changes: ■ Add and drop attributes ■ Add and drop methods ■ Modify a numeric attribute to increase its length, precision, or scale ■ Modify a varying length character attribute to increase its length ■ Change a type’s FINAL and INSTANTIABLE properties Dependencies of a type to be changed are checked using essentially the same validations applied for a CREATE TYPE statement.

You can declare a map method or an order method but not both. If you declare a method of either type, you can compare objects in SQL and procedural statements. However, if you declare neither method, you can compare objects only in SQL statements and only for equality or inequality. ) When sorting or merging a large number of objects, use a map method. One call maps all the objects into scalars, then sorts the scalars. An order method is less efficient because it must be called repeatedly (it can compare only two objects at a time).

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