|Oracle® Database SQL Language Reference
11g Release 2 (11.2)
|PDF · Mobi · ePub|
Object types are defined using PL/SQL. Therefore, this section provides some general information but refers to Oracle Database PL/SQL Language Reference for details of syntax and semantics.
TYPE statement to create the specification of an object type, a SQLJ object type, a named varying array (varray), a nested table type, or an incomplete object type. You create object types with the
TYPE and the
BODY statements. The
TYPE statement specifies the name of the object type, its attributes, methods, and other properties. The
BODY statement contains the code for the methods that implement the type.
If you create an object type for which the type specification declares only attributes but no methods, then you need not specify a type body.
If you create a SQLJ object type, then you cannot specify a type body. The implementation of the type is specified as a Java class.
An incomplete type is a type created by a forward type definition. It is called "incomplete" because it has a name but no attributes or methods. It can be referenced by other types, and so can be used to define types that refer to each other. However, you must fully specify the type before you can use it to create a table or an object column or a column of a nested table type.
CREATE TYPE BODY for information on creating the member methods of a type
Oracle Database Object-Relational Developer's Guide for more information about objects, incomplete types, varrays, and nested tables
To create a type in your own schema, you must have the
TYPE system privilege. To create a type in another user's schema, you must have the
TYPE system privilege. You can acquire these privileges explicitly or be granted them through a role.
To create a subtype, you must have the
TYPE system privilege or the
UNDER object privilege on the supertype.
The owner of the type must be explicitly granted the
EXECUTE object privilege in order to access all other types referenced within the definition of the type, or the type owner must be granted the
TYPE system privilege. The owner cannot obtain these privileges through roles.
If the type owner intends to grant other users access to the type, then the owner must be granted the
EXECUTE object privilege on the referenced types with the
OPTION or the
TYPE system privilege with the
OPTION. Otherwise, the type owner has insufficient privileges to grant access on the type to other users.
Types are defined using PL/SQL. Therefore, the syntax diagram in this book shows only the SQL keywords. Refer to Oracle Database PL/SQL Language Reference for the PL/SQL syntax, semantics, and examples.
plsql_source: See Oracle Database PL/SQL Language Reference.)
REPLACE to re-create the type if it already exists. Use this clause to change the definition of an existing type without first dropping it.
Users previously granted privileges on the re-created object type can use and reference the object type without being granted privileges again.
If any function-based indexes depend on the type, then Oracle Database marks the indexes
See Oracle Database PL/SQL Language Reference for the syntax and semantics of the