PL/SQL์ด๋ ?
์ค๋ผํด์์ ์ ๊ณตํ๋ ํ๋ก๊ทธ๋๋ฐ ์ธ์ด
ํ๋ก๊ทธ๋๋ฐ ์ธ์ด์ ์์๋ฅผ ๊ฐ์ถ๊ณ ๋ฐ์ดํฐ๋ฒ ์ด์ค ์ ๋ฌด๋ฅผ ์ฒ๋ฆฌํ๊ธฐ ์ํ ์ต์ ํ ์ธ์ด.
EX ) Procedural extension Language to Structured Query (PL) -> ์ฒ๋ฆฌ์ธ์ด
(Process = ์ฒ๋ฆฌํ๋ค)
(Procedure = ์ฒ๋ฆฌ์)
SQL์ ํ์ฅํ ์์ฐจ์ ์ธ ์ธ์ด : Procudure(๋ฆฌํด x), Function(๋ฆฌํด o), Trigger(์๋ํธ์ถํจ์, ํธ์ถ์์ํด๋ ํธ์ถ๋๋ ์ฝ๋ฐฑ Call backํจ์)
๐ PL/SQL์ ๊ธฐ๋ณธ ๊ตฌ์กฐ
DECLARE(์ ์ธ๋ถ) : ๋ฉค๋ฒ ๋ณ์๋ ์์๋ฅผ ์ ์ธํ๋ค.
BEGIN ~ END(์คํ๋ถ) : ์ ์ด๋ฌธ, ๋ฐ๋ณต๋ฌธ ๋ฑ๋ฑ ํจ์๋ฑ์ ๊ธฐ์ ํ๋ ๋ถ๋ถ์ด๋ค.
EXEPTION(์์ธ์ฒ๋ฆฌ) : ์๋ฌ๋ฐ์ํ ๋ช ๋ น๋ค์ ๊ธฐ์ ํ๋ ๋ถ๋ถ.
Anonymous PL/SQL Block (์ต๋ช ๋ธ๋ก) : ์ผํ์ฑ์ผ๋ก ์ฌ์ฉ๋ ๊ฒฝ์ฐ ๋ง์ด ์ฌ์ฉ.
Stored PL/SQL Block (์ ์ฅ ๋ธ๋ก) : ์๋ฒ์ ์ ์ฅํด ๋๊ณ ๋ฐ๋ณต, ์ฃผ๊ธฐ์ ์ผ๋ก ๋ง์ด ์ฌ์ฉ.
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/*
PL/SQL
Procedural extension Language to Structured Query (PL) -> ์ฒ๋ฆฌ์ธ์ด
Process = ์ฒ๋ฆฌํ๋ค
Procedure = ์ฒ๋ฆฌ์
SQL์ ํ์ฅํ ์์ฐจ์ ์ธ ์ธ์ด : Procudure(๋ฆฌํด x), Function(๋ฆฌํด o), Trigger(์๋ํธ์ถํจ์, ํธ์ถ์์ํด๋ ํธ์ถ๋๋ ์ฝ๋ฐฑ Call backํจ์)
*/
/*
Script์ ๊ตฌ์กฐ
1. ์ ์ธ๋ถ : ๋ณ์, ์์, ์ด๊ธฐํ
2. ์คํ๋ถ : Query, ์ ์ด๋ฌธ, ์ค์ ์ฒ๋ฆฌ
3. ์์ธ์ฒ๋ฆฌ : ๊ฐ์ข
์ค๋ฅ (-์๋ต๊ฐ๋ฅ-)
*/
-------------------------------------------------------------------------------
SET SERVEROUTPUT ON -- ์ฝ์์ ์ถ๋ ฅ๋๋ ๋ฌธ์ฅ์ด ๋ณด์ด๋๋ก ํจ (CONSOLE์ ์ถ๋ ฅ์ ์ค์ )
-- ํ๋ฒ๋ง ์คํํ๋ฉด ํ์ผ ์์์ ๋ค ์คํํจ
SET SERVEROUTPUT OFF -- ์ถ๋ ฅ์ ๋๋ ํจ์
-------------------------------------------------------------------------------
BEGIN
--์คํ๋ถ
dbms_output.put_line('HEELO PL'); -- ์๋ฐ์ System out println๊ณผ ๊ฐ์
END;
/
-------------------------------------------------------------------------------
DECLARE
--์ ์ธ๋ถ
message VARCHAR2(10); -- ๋ณ์์ ์ธ
BEGIN
--์คํ๋ถ
message := 'hello PL'; -- ':=' ๋์
์ฐ์ฐ์
DBMS_OUTPUT.PUT_LINE('message =' || message); -- ์ถ๋ ฅ
END;
/
-------------------------------------------------------------------------------
--์ ์ด๋ฌธ
--#1 if
DECLARE
counter INTEGER;
BEGIN
counter := 1;
counter := counter + 1;
IF counter IS NULL THEN
dbms_output.put_line('counter is null');
ELSE
dbms_output.put_line('counter is not null');
END IF;
END;
/
-------------------------------------------------------------------------------
--#2 ELSIF (=ELSE IF)
DECLARE
counter INTEGER;
BEGIN
counter := 1;
counter := counter + 3;
IF counter < 1 THEN
dbms_output.put_line('counter is null');
ELSIF counter > 2 THEN
dbms_output.put_line('์์ค ์ดํ ์ถ๋ ฅ');
ELSE
dbms_output.put_line('counter is not null');
END IF;
END;
/
-------------------------------------------------------------------------------
-- FOR ๋ฌธ
DECLARE
counter INTEGER;
i INTEGER;--LOOP์ฉ ๋ณ์
BEGIN
FOR i IN 1..9 LOOP
dbms_output.put_line('i= '||i);
counter := i*2;
dbms_output.put_line('counter= '|| counter);
END LOOP;
END;
/
-------------------------------------------------------------------------------
--LOOP ๋ฌธ
DECLARE
V_count NUMBER := 0;
V_total NUMBER := 0;
BEGIN
LOOP
EXIT WHEN V_count = 10;-- ์ด ์กฐ๊ฑด์ผ ์ ๋ฃจํ ํ์ถํด๋ผ
V_count := V_count + 1;
V_total := V_total + V_count;
dbms_output.put_line('V_count= '|| V_count);
END LOOP;
dbms_output.put_line('V_total= '|| V_total);
END;
/
-------------------------------------------------------------------------------
-- WHILE ๋ฌธ
DECLARE
v_count NUMBER := 0;
v_total NUMBER := 0;
BEGIN
WHILE v_count < 10
LOOP
v_count := v_count + 1;
v_total := v_total + v_count;
dbms_output.put_line('V_count= '|| V_count);
END LOOP;
dbms_output.put_line('V_total= '|| V_total);
END;
/
-------------------------------------------------------------------------------
-- GOTO ๋ฌธ (~๋ก ๊ฐ๋ผ)
--์ฅ์ : ์๋๊ฐ ๋น ๋ฅด๋ค.
DECLARE
v_name VARCHAR2(10) := 'LEE';
v_case NUMBER := 0;
BEGIN
CASE WHEN MOD(v_case, 2) = 0 THEN -- ์ฒซ๋ฒ์งธ ์กฐ๊ฑด ๋ค์ด๊ฐ๋๊ฒ / MOD ๋๋ ๋๋จธ์ง๊ฐ
GOTO test1;
WHEN MOD(v_case, 2) = 1 THEN
GOTO test2;
ELSE
GOTO err; -- ์ซ์๊ฐ ์๋๋ฉด err
END CASE;
<<test1>> --<<>> ๋ถ๋ฑํธ ์น ์ด์ชฝ์ผ๋ก ์ค๊ฒ๋๋ค
dbms_output.put_line(v_name || 'is woman');
GOTO sub_end; -- ๋๋งบ๋ ๋ถ๋ถ
<<test2>>
dbms_output.put_line(v_name || 'is man');
GOTO sub_end; -- ๋๋งบ๋ ๋ถ๋ถ
<<err>>
dbms_output.put_line(v_name || 'error');
GOTO sub_end; -- ๋๋งบ๋ ๋ถ๋ถ
<<sub_end>>
dbms_output.put_line('end');
END;
/
-------------------------------------------------------------------------------
-- ์์ธ ์ฒ๋ฆฌ๋ถ
DECLARE
counter INTEGER;
BEGIN
counter := 10;
counter := counter / 0; -- 0์ผ๋ก ๋๋์ ์์ด์ ์์ธ๋ฐ์
EXCEPTION WHEN OTHERS THEN -- ์์ธ์ฒ๋ฆฌ
dbms_output.put_line('์์ธ๊ฐ ๋ฐ์ํ์์ต๋๋ค');
END;
/
-------------------------------------------------------------------------------
-- VARRAY -> VARIABLE ARRAY(๋ฐฐ์ด)
DECLARE
TYPE varray_test IS VARRAY(3) OF INTEGER; --varray_test ->์๋ฃํ
myarr varray_test; --myarr -> ์ง์ง๋ณ์
BEGIN
myarr := varray_test(11,22,33);
DBMS_OUTPUT.PUT_LINE('myarr(2)=' || myarr(2));
END;
/
-------------------------------------------------------------------------------
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cs |
'๐ฆ ๋ฐ์ดํฐ ๋ฒ ์ด์ค (DB) ๐ฆ > ๐ฆ PL\SQL' ์นดํ ๊ณ ๋ฆฌ์ ๋ค๋ฅธ ๊ธ
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