create_assocarray4.sql

介绍Oracle PL SQL编程

/*
 * create_assocarray4.sql
 * Chapter 6, Oracle10g PL/SQL Programming
 * by Ron Hardman, Michael McLaughlin and Scott Urman
 *
 * This script demonstrates you cannot use the Collection API EXTEND method
 * to allocated space.
 */

SET ECHO ON
SET SERVEROUTPUT ON SIZE 1000000

DECLARE

  -- Define an associative array of strings.
  TYPE card_table IS TABLE OF VARCHAR2(5 CHAR)
    INDEX BY BINARY_INTEGER;

  -- Define an associative array variable.
  cards CARD_TABLE;

BEGIN

  IF cards.COUNT <> 0 THEN

    -- Print an element of the cards associative array.
    DBMS_OUTPUT.PUT_LINE(cards(1));

  ELSE

    -- Allocate space like varray and nested tables do.
    cards.EXTEND;
 
    -- Print a null element of the cards associative array.
--    DBMS_OUTPUT.PUT_LINE(cards(1));

  END IF;

END;
/