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Support for Object-Oriented Programming → PL/SQL supports object-oriented programming with \"Abstract Data Types\".
Contents → Conventions What's New in Object-Relational Features? Oracle Database 11g Release 2 (11.2) New Features … in Object-Relational Features Oracle Database 11g Release 1 (11.1) New Features in Object-Relational … Features Oracle Database 10 g Release 1 (10.1) New Features in Object-Relational Features 1 … Introduction
Object Values → Object values are compared using one of two comparison functions: MAP and ORDER. Both functions … compare object type instances, but they are quite different from one another. These functions must be … specified as part of any object type that will be compared with other object types. See Also: CREATE
Object Types → Object types are abstractions of the real-world entities, such as purchase orders, that application … programs deal with. An object type is a schema object with three kinds of components: A name, which … identifies the object type uniquely within that schema. Attributes, which are built-in types or
Object Views → Just as a view is a virtual table, an object view is a virtual object table. Each row in the view … is an object, which is an instance of an object type. An object type is a user-defined data type. You … can retrieve, update, insert, and delete relational data as if it was stored as an object
Object Tables → An Oracle object type is a user-defined type with a name, attributes, and methods. Object types … database. An object type defines a logical structure, but does not create storage. Example 2-5 … creates an object type named department_typ. Example 2-5 Object Type CREATE TYPE department_typ AS OBJECT
About Object Dependencies and Object Invalidation → static SQL to reference tables or views. An object that references another object is called a … dependent object, and an object being referenced is a referenced object. These references are established … at compile time, and if the compiler cannot resolve them, the dependent object being
Managing Object Name Resolution → Object names referenced in SQL statements can consist of several pieces, separated by periods. The … following describes how the database resolves an object name. Oracle Database attempts to qualify … schema, the database searches for an object whose name matches the first piece of the object name … . If it does
Database Object Metadata → The DBMS_METADATA package provides interfaces for extracting complete definitions of database objects. The definitions can be expressed either as XML or as SQL DDL. Two styles of interface are provided: a flexible, sophisticated interface for programmatic control, and a simplified interface for ad hoc querying. See Also: Oracle Database PL/SQL Packages and Types Reference for more information about
Database Object Naming Rules → Every database object has a name. In a SQL statement, you represent the name of an object with a … marks (\"). If you name a schema object using a quoted identifier, then you must use the double … quotation marks whenever you refer to that object. A nonquoted identifier is not surrounded by any … punctuation.
Large Object Functions → The large object functions operate on LOBs. The large object functions are: BFILENAME EMPTY_BLOB, EMPTY_CLOB
Schema Object Types → Security\" to learn more about users and privileges Schema Object Types The most important schema objects … A sequence is a user-created object that can be shared by multiple users to generate integers … another schema object. Because a synonym is simply an alias, it requires no storage other than its
Schema Object Dependencies → manage storage for schema objects Schema Object Dependencies Some schema objects reference other objects … , creating schema object dependencies. For example, a view contains a query that references tables or … other views, while a PL/SQL subprogram invokes other subprograms. If the definition of object A … references object
Object Access Expressions → An object access expression specifies attribute reference and method invocation … be an object or REF column. If you specify expr, then it must resolve to an object type. When a … based on the sample oe.order_item_typ object type, and then shows how you would update and select from … the object
Schema Object Naming Examples → The following examples are valid schema object names: last_name horse hr.hire_date \"EVEN THIS … Object Naming Rules\". The following example is not valid, because it exceeds 30 characters
Schema Object Naming Guidelines → Here are several helpful guidelines for naming objects and their parts: Use full, descriptive, pronounceable names (or well-known abbreviations). Use consistent naming rules. Use the same name to describe the same entity or attribute across tables. When naming objects, balance the objective of keeping names short and easy to use with the objective of making names as descriptive as possible. When in
Object Reference Functions → Object reference functions manipulate REF values, which are references to objects of specified … object types. The object reference functions are: DEREF MAKE_REF REF REFTOHEX VALUE See Also: Oracle … Database Object-Relational Developer's Guide for more information about REF data types
Schema Object Name Resolution → user that issued the SQL statement, object resolution continues as if the remote user had issued the … rules: Type of Link Specified Location of Object Resolution A fixed user database link Schema specified … current user database link Current user's schema If the database cannot find the object, then it checks … public objects
Dropping Unused Object Storage → Beginning with Oracle Database 11 g release 2 (188.8.131.52), the DBMS_SPACE_ADMIN package includes the DROP_EMPTY_SEGMENTS procedure, which enables you to drop segments for empty tables and partitions that have been migrated from previous releases. This includes segments of dependent objects of the table, such as index segments, where possible. The following example drops empty segments from every table
Obtaining Object Growth Trends → , where each row describes the space use of the object at a specific time. The function retrieves the … function requires as input the following values: OBJECT_OWNER: The owner of the object. OBJECT_NAME … : The name of the object. PARTITION_NAME: The name of the table or index partition, is relevant … . Specify NULL otherwise.