절차 또는 함수

현재 oracle 10g를 사용하여 pl/sql을 학습 중입니다. 특정 혼란이 있습니다 언제 저장 프로 시저를 사용해야하며 언제 기능을 사용해야합니까? 실생활에서 좀 도와주세요. 감사합니다.절차 또는 함수

2013-10-09 curious coder

DECLARE 
    l_user_id  VARCHAR2(1); 
    l_received_user VARCHAR2(30); 

    PROCEDURE print_user_name(user_name_in IN VARCHAR2) 
    AS 
    BEGIN 
     DBMS_OUTPUT.PUT_LINE('The user''s name is: ' || INITCAP(user_name_in)); 
    END print_user_name; 

    FUNCTION get_user_name(user_id_in IN VARCHAR2) RETURN VARCHAR2 
    AS 
     l_user_name VARCHAR2(30); 
    BEGIN 
     SELECT 'Amanda' 
     INTO l_user_name 
     FROM dual 
     WHERE dummy = user_id_in; 

     RETURN l_user_name; 
    END get_user_name; 
BEGIN 
    -- excute an action -- 
    print_user_name('John'); 

    l_user_id := 'X'; 

    -- hold action's result in a variable -- 
    l_received_user := get_user_name(l_user_id); 

    -- work with the received result/variable -- 
    DBMS_OUTPUT.PUT_LINE('The received user''s name is: ' || INITCAP(l_received_user)); 

    IF l_received_user = 'John' THEN 
     DBMS_OUTPUT.PUT_LINE('The received user''s name is John'); 
    ELSE 
     DBMS_OUTPUT.PUT_LINE('The received user''s name is not John'); 
    END IF; 
END; 
/* 
The user's name is: John 
The received user's name is: Amanda 
The received user's name is not John 
*/

출처

2013-10-09 12:41:53