基础类型

类型声明：

CREATE OR REPLACE TYPE base_type AS OBJECT
(
   base_id     INTEGER,
   base_attr   VARCHAR2(400),
   null_attr   INTEGER, -- Present only to demonstrate non-default constructors
   CONSTRUCTOR FUNCTION base_type
   (
      i_base_id INTEGER,
      i_base_attr VARCHAR2
   ) RETURN SELF AS RESULT,
   MEMBER FUNCTION get_base_id RETURN INTEGER,
   MEMBER FUNCTION get_base_attr RETURN VARCHAR2,
   MEMBER PROCEDURE set_base_id(i_base_id INTEGER),
   MEMBER PROCEDURE set_base_attr(i_base_attr VARCHAR2),
   MEMBER FUNCTION to_string RETURN VARCHAR2
) INSTANTIABLE NOT FINAL

输入体型：

CREATE OR REPLACE TYPE BODY base_type AS
   CONSTRUCTOR FUNCTION base_type
   (
      i_base_id INTEGER,
      i_base_attr VARCHAR2
   ) RETURN SELF AS RESULT
   IS
   BEGIN
      self.base_id := i_base_id;
      self.base_attr := i_base_attr;
      RETURN;
   END base_type;

   MEMBER FUNCTION get_base_id RETURN INTEGER IS
   BEGIN
      RETURN self.base_id;
   END get_base_id;

   MEMBER FUNCTION get_base_attr RETURN VARCHAR2 IS
   BEGIN
      RETURN self.base_attr;
   END get_base_attr;

   MEMBER PROCEDURE set_base_id(i_base_id INTEGER) IS
   BEGIN
      self.base_id := i_base_id;
   END set_base_id;

   MEMBER PROCEDURE set_base_attr(i_base_attr VARCHAR2) IS
   BEGIN
      self.base_attr := i_base_attr;
   END set_base_attr;

   MEMBER FUNCTION to_string RETURN VARCHAR2 IS
   BEGIN
      RETURN 'BASE_ID ['||self.base_id||']; BASE_ATTR ['||self.base_attr||']';
   END to_string;
END;