오라클 with 절
DB CAFE
thumb_up 추천메뉴 바로가기
- DBA { Oracle DBA 명령어 > DBA 초급 과정 > DBA 고급 과정 }
- 튜닝 { 오라클 튜닝 목록 }
- 모델링 { 데이터 모델링 가이드 }
1 오라클 12c 부터 with절에 function ,procedure 사용가능[편집]
1.1 함수 사용 예제[편집]
WITH
FUNCTION with_function(p_id IN NUMBER) RETURN NUMBER IS
BEGIN
RETURN p_id;
END;
SELECT with_function(222)
FROM dual
WHERE rownum = 1
;1.2 프로시져 사용 예제[편집]
WITH
PROCEDURE with_procedure(p_id IN NUMBER) IS
BEGIN
DBMS_OUTPUT.put_line('p_id=' || p_id);
END;
FUNCTION with_function(p_id IN NUMBER) RETURN NUMBER IS
BEGIN
with_procedure(p_id);
RETURN p_id;
END;
SELECT with_function(id)
FROM t1
WHERE rownum = 1- PL/SQL 블럭에서는 제한적으로 사용가능
There does not appear to be any PL/SQL support for this feature.
PL/SQL에서
SET SERVEROUTPUT ON
DECLARE
l_time PLS_INTEGER;
l_cpu PLS_INTEGER;
l_sql VARCHAR2(32767);
l_cursor SYS_REFCURSOR;
TYPE t_tab IS TABLE OF NUMBER;
l_tab t_tab;
BEGIN
l_time := DBMS_UTILITY.get_time;
l_cpu := DBMS_UTILITY.get_cpu_time;
l_sql := 'WITH
FUNCTION with_function(p_id IN NUMBER) RETURN NUMBER IS
BEGIN
RETURN p_id;
END;
SELECT with_function(id)
FROM t1';
OPEN l_cursor FOR l_sql;
FETCH l_cursor
BULK COLLECT INTO l_tab;
CLOSE l_cursor;
DBMS_OUTPUT.put_line('WITH_FUNCTION : ' ||
'Time=' || TO_CHAR(DBMS_UTILITY.get_time - l_time) || ' hsecs ' ||
'CPU Time=' || (DBMS_UTILITY.get_cpu_time - l_cpu) || ' hsecs ');
l_time := DBMS_UTILITY.get_time;
l_cpu := DBMS_UTILITY.get_cpu_time;
l_sql := 'SELECT normal_function(id)
FROM t1';
OPEN l_cursor FOR l_sql;
FETCH l_cursor
BULK COLLECT INTO l_tab;
CLOSE l_cursor;
DBMS_OUTPUT.put_line('NORMAL_FUNCTION: ' ||
'Time=' || TO_CHAR(DBMS_UTILITY.get_time - l_time) || ' hsecs ' ||
'CPU Time=' || (DBMS_UTILITY.get_cpu_time - l_cpu) || ' hsecs ');
END;
/
WITH_FUNCTION : Time=45 hsecs CPU Time=39 hsecs
NORMAL_FUNCTION: Time=129 hsecs CPU Time=113 hsecs