|Oracle® Database PL/SQL Language Reference
11g Release 1 (11.1)
|PDF · Mobi · ePub|
BODY defines or implements the member methods defined in the object type specification. You create object types with the
TYPE and the
BODY statements. The CREATE 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.
For each method specified in an object type specification for which you did not specify the
call_spec, you must specify a corresponding method body in the object type body.
Note:If you create a SQLJ object type, then specify it as a Java class.
Every member declaration in the
TYPE specification for object types must have a corresponding construct in the
To create or replace a type body in your own schema, you must have the
TYPE or the
TYPE system privilege. To create an object type in another user's schema, you must have the
TYPE system privilege. To replace an object type in another user's schema, you must have the
TYPE system privilege.
REPLACE to re-create the type body if it already exists. Use this clause to change the definition of an existing type body without first dropping it.
Users previously granted privileges on the re-created object type body can use and reference the object type body without being granted privileges again.
You can use this clause to add new member subprogram definitions to specifications added with the
Specify the schema to contain the type body. If you omit
schema, then the database creates the type body in your current schema.
Specify the name of an object type.
Specify the type of function or procedure subprogram associated with the object type specification.
You must define a corresponding method name and optional parameter list in the object type specification for each procedure or function declaration. For functions, you also must specify a return type.
constructor_declaration Declare a user-defined constructor subprogram. The
RETURN clause of a constructor function must be
RESULT. This setting indicates that the most specific type of the value returned by the constructor function is the same as the most specific type of the
SELF argument that was passed in to the constructor function.
CREATE TYPE Statement for a list of restrictions on user-defined functions
Overloading PL/SQL Subprogram Names for information about overloading subprogram names
Oracle Database Object-Relational Developer's Guide for information about and examples of user-defined constructors
Declares items that are local to the procedure or function.
Procedure or function statements.
Java_declaration string identifies the Java implementation of the method.
Oracle Database Java Developer's Guide for an explanation of the parameters and semantics of the
Oracle Database Advanced Application Developer's Guide for information about calling external procedures
You can declare either one
MAP method or one
ORDER method, regardless of how many
STATIC methods you declare. If you declare either a
ORDER method, then you can compare object instances in SQL.
If you do not declare either method, then you can compare object instances only for equality or inequality. Instances of the same type definition are equal only if each pair of their corresponding attributes is equal.
MEMBER to declare or implement a
MAP member function that returns the relative position of a given instance in the ordering of all instances of the object. A
MAP method is called implicitly and specifies an ordering of object instances by mapping them to values of a predefined scalar type. PL/SQL uses the ordering to evaluate Boolean expressions and to perform comparisons.
If the argument to the
MAP method is null, then the
MAP method returns null and the method is not invoked.
An object type body can contain only one
MAP method, which must be a function. The
MAP function can have no arguments other than the implicit
MEMBER to specify an
ORDER member function that takes an instance of an object as an explicit argument and the implicit
SELF argument and returns either a negative integer, zero, or a positive integer, indicating that the implicit
SELF argument is less than, equal to, or greater than the explicit argument, respectively.
If either argument to the
ORDER method is null, then the
ORDER method returns null and the method is not invoked.
When instances of the same object type definition are compared in an
BY clause, the database invokes the
An object specification can contain only one
ORDER method, which must be a function having the return type
EXTERNAL is an alternative way of declaring a C method. This clause has been deprecated and is supported for backward compatibility only. Oracle recommends that you use the
call_spec syntax with the