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Triggers on Object Tables → You can use the OBJECT_VALUE pseudocolumn in a trigger on an object table because, as of 10 g … Release 1 (10.1), OBJECT_VALUE means the object as a whole. This is one example of its use. You can also … example of the use of OBJECT_VALUE in a trigger. To keep track of updates to values in an object table … object
Support for Object-Oriented Programming → Object types are an ideal object-oriented modeling tool, which you can use to reduce the cost and … are modular, maintainable, and reusable, object types allow different teams of programmers to … develop software components concurrently. By encapsulating operations with data, object types let you move … data-maintenance
Using Object Types with IR Subprograms → To define object types for use in any schema, specify the AUTHID CURRENT_USER clause. For … information about object types, see Oracle Database Object-Relational Developer's Guide. Suppose that user HR … creates the object type in Example 8-16. Example 8-16 Creating an Object Type with AUTHID CURRENT
Predefined PL/SQL Large Object (LOB) Data Types → Large object (LOB) data types reference large objects that are stored separately from other data … Table 3-9. Table 3-9 Predefined PL/SQL Large Object (LOB) Data Types Data Type Description Size … large object that is stored in an external file, a LOB data type uses a LOB locator, which is stored … includes a transaction ID, so
Contents → Conventions What's New 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 … of the Object-Relational Model Database Features of Oracle Objects About Object Types About Object
Object Status → Every database object has one of the status values described in Table 6-1. Table 6-1 Database … Object Status Status Meaning Valid The object was successfully compiled, using the current definition in … the data dictionary. Compiled with errors The most recent attempt to compile the object produced … errors. Invalid
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 → In the Oracle object-relational database, an object view let you retrieve, update, insert, and … delete relational data as if it was stored as an object type. You can also define views with columns … that are object datatypes, such as objects, REF s, and collections (nested tables and VARRAY s). See … Also: Oracle
Object Revalidation → An object that is not valid when it is referenced must be validated before it can be used … . Validation occurs automatically when an object is referenced; it does not require explicit user action. If … an object is not valid, its status is either compiled with errors, unauthorized, or invalid. For … Errors The compiler cannot
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
Overview of Object Datatypes and Object Views → Object types and other user-defined datatypes let you define datatypes that model the structure and … behavior of the data in their applications. An object view is a virtual object table. See Also: Oracle Database Object-Relational Developer's Guide
Schema 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.
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 Access Expressions → An object access expression specifies attribute reference and method invocation … an object or REF column. If you specify expr, then it must resolve to an object type. When a type's … 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 … & THAT!\" a_very_long_and_valid_name All of these examples adhere to the rules listed in \"Schema Object
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 datatypes
Managing Object Dependencies → This section provides background information about object dependencies and object invalidation, and … explains how invalid objects can be revalidated. The following topics are included: About Object … Dependencies and Object Invalidation Manually Recompiling Invalid Objects with DDL Manually Recompiling Invalid Objects
Large Object Functions → The large object functions operate on LOBs. The large object functions are: BFILENAME EMPTY_BLOB, EMPTY_CLOB
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 A simplified interface for ad hoc querying See Also: Oracle Database PL/SQL Packages and Types Reference for more information about DBMS_METADATA