如何聲明一個存儲過程
CREATE PROCEDURE 存儲過程名(IN 輸入變量名 輸入變量類型,OUT 輸出變量名 輸出變量類型)
緊跟其后的是存儲過程屬性列表
常用的有:LANGUAGE SQL、MODIFIES SQL DATA、RESULT SETS 1(返回結果集個數)
l 存儲過程體以begin開始
l 存儲過程體以end結束
存儲過程約束規則
存儲過程中調用存儲過程
CALL 存儲過程名(參數1,參數2,參數n)
例:
call spco_init_custom(bankcode,errno,errmsg);
GET DIAGNOSTICS retval=RETURN_STATUS;
if(retval<>0) then
set errno=errno;
set errmsg=errmsg;
return errno;
end if;
變量的定義
變量使用前必須先定義,方法為
DECLARE 變量名 變量類型 (default 默認值)
例:
DECLARE SQLCODE INTEGER DEFAULT 0;
DECLARE inum INTEGER DEFAULT 0;
DECLARE curtime char(8);
DECLARE bcode char(6);
DECLARE sqlstate char(5);
if 表達式
if 條件1 then
邏輯體;
elseif 條件2 then
邏輯體;
else
邏輯體;
end if;
例:
IF rating = 1 THEN
UPDATE employee
SET salary = salary * 1.10, bonus = 1000
WHERE empno = employee_number;
ELSEIF rating = 2 THEN
UPDATE employee
SET salary = salary * 1.05, bonus = 500
WHERE empno = employee_number;
ELSE
UPDATE employee
SET salary = salary * 1.03, bonus = 0
WHERE empno = employee_number;
END IF;
case表達式
case 變量名 when
變量值1 then
. . .
when
變量值2 then
- - -
else
. . .
end case;
或
case when
變量名=變量值1 then
. . .
when
變量名=變量值2 then
- - -
else
. . .
end case;
例一:
CASE v_workdept
WHEN 'A00'
THEN UPDATE department
SET deptname = 'DATA ACCESS 1';
WHEN 'B01'
THEN UPDATE department
SET deptname = 'DATA ACCESS 2';
ELSE UPDATE department
SET deptname = 'DATA ACCESS 3';
END CASE;
例二:
CASE
WHEN v_workdept = 'A00'
THEN UPDATE department
SET deptname = 'DATA ACCESS 1';
WHEN v_workdept = 'B01'
THEN UPDATE department
SET deptname = 'DATA ACCESS 2';
ELSE UPDATE department
SET deptname = 'DATA ACCESS 3';
END CASE;
for 表達式
for 循環名 as
游標名或select 表達式
do
sql表達式;
end for;
例:
1)
DECLARE fullname CHAR(40);
FOR vl AS
SELECT firstnme, midinit, lastname FROM employee
DO
SET fullname = lastname || ',' || firstnme ||' ' || midinit;
INSERT INTO tnames VALUE (fullname);
END FOR
2)
for loopcs1 as cousor1 cursor as
select market_code as market_code
from tb_market_code
for update
do
end for;
goto表達式
goto 標示名;
標示名:
邏輯體;
例:
GOTO FAIL;
...
SUCCESS: RETURN 0
FAIL: RETURN -200
while表達式
while 條件表達式 do
邏輯體;
end while;
LOOP表達式
LOOP... END LOOP;
例:
OPEN c1;
ins_loop:
LOOP
FETCH c1 INTO v_dept, v_deptname, v_admdept;
IF at_end = 1 THEN
LEAVEins_loop; --中斷循環
ELSEIF v_dept = 'D11' THEN
ITERATEins_loop; --下一個循環
END IF;
INSERT INTO department (deptno, deptname, admrdept)
VALUES ('NEW', v_deptname, v_admdept);
END LOOP;
CLOSE c1;
關於游標
定義游標:
DECLARE 游標名 CURSOR FOR
Select 語句;
打開游標:
OPEN 游標名;
取值:
FETCH 游標名 INTO 變量列表
例:
DECLARE c1 CURSOR FOR
SELECT CAST(salary AS DOUBLE)
FROM staff
WHERE DEPT = deptNumber
ORDER BY salary;
DECLARE EXIT HANDLER FOR NOT FOUND
SET medianSalary = 6666;
SET medianSalary = 0;
SELECT COUNT(*) INTO v_numRecords
FROM staff
WHERE DEPT = deptNumber;
OPEN c1;
WHILE v_counter < (v_numRecords / 2 + 1) DO
FETCH c1 INTO medianSalary;
SET v_counter = v_counter + 1;
END WHILE;
CLOSE c1;
注:游標的申明如果放在中間段,要用”begin。。。end;”.段分割標志分割開;
動態sql
1) declare stmt varchar(1024);
set stmt='create table zhouhaiming( f1 smallint, f2 varchar(9), f3 char(5) )';
prepare s1 from stmt;
execute s1;
set stmt='insert into zhouhaiming values (1,'www','aaa')';
prepare s1 from stmt;
execute s1;
2) DECLARE CURSOR C1 FOR STMT1;
PREPARE STMT1 FROM
'ALLOCATE C2 CURSOR FOR RESULT SET ?';
臨時表的建立
DECLARE GLOBAL TEMPORARY TABLE TABLE_NAME
AS (FULLSELECT) DEFINITION ONLY
EXCLUDING IDENTITY COLUMN ATTRIBUTES
ON COMMIT DELETE ROWS
NOT LOGGED IN 臨時表空間名with replace;
第一行規定臨時表的名稱.
第二行規定臨時表的列的定義.
第三行規定不是從源結果表定義中復制的恆等列.
第四行規定如果沒有打開WITH GOLD光標,將會刪除表的所有行.
第五行規定不對表的改變進行記錄.
With replace選項會隱式的自動刪除該臨時表。
例如:
DECLARE GLOBAL TEMPORARY TABLE DEC_BSEMPMS
AS (SELECT * FROM BSEMPMS) DEFINITION ONLY
EXCLUDING IDENTITY COLUMN ATTRIBUTES
ON COMMIT DELETE ROWS
NOT LOGGED;
DB2中的幾個全局變量
n ROW_COUNT—影響行數
UPDATE CORPDATA.PROJECT
SET PRSTAFF = PRSTAFF + 1.5
WHERE DEPTNO = deptnbr;
GET DIAGNOSTICSrcount = ROW_COUNT;
n RETURN_STATUS--返回狀態
CALL TRYIT;--調用存儲過程
GET DIAGNOSTICSRETVAL = RETURN_STATUS;
IF RETVAL <> 0 THEN
...
LEAVE A1;
ELSE
...
END IF;
n SQLSTATE—SQL返回錯誤代碼
注:使用前必先定義
declare sqlstate char(5);
declare state char(5);
insert into tbname values(…)
set state=sqlstate;
if(state<> '00000') then
return -1;
end if;
關於ATOMIC和NOT ATOMIC
P1:BEGIN ATOMIC –P1段的事務會自動回滾
P1:BEGIN NOT ATOMIC –P1段的事務不會自動回滾
DB2中的條件句柄
句柄類型:
n CONTINUE
n EXIT
n UNDO
條件類型:
n SQLSTATE string
n SQLEXCEPTION
n SQLWARNING
n NOT FOUND
例:
1)DECLARE EXIT HANDLER FOR NOT FOUND
SET medianSalary = 6666;
2) DECLARE not_found CONDITION FOR SQLSTATE '02000';
DECLARE EXIT HANDLER FOR not_found
SET rating = -1;
3) DECLARE not_found CONDITION FOR SQLSTATE '02000';
DECLARE c1 CURSOR FOR
SELECT deptno, deptname, admrdept
FROM department
ORDER BY deptno;
DECLARE CONTINUE HANDLER FOR not_found
SET at_end = 1;
如何抽取/提交存儲過程
db2 "get routine into 文件名 from procedure 存儲過程名"
抽取存儲過程;
提交存儲過程
db2 "put routine from 文件名"
安裝已編譯好的存儲過程。
如何在命令符下提交存儲過程
在存儲過程的最后加上@符號,然后在命令符下打入:db2 -td@ -vf procfile.sql 就可以生成過程。
非存儲過程的SQL文件,在命令符下打入:db2 –tvf sqlfile.sql
從存儲過程返回結果集(游標)的用法
1、建一sp返回結果集
CREATE PROCEDURE DB2INST1.Proc1 (
LANGUAGE SQL
result sets 2 --(返回兩個結果集)
P1: BEGIN
declare c1 cursor with return to caller for
select market_code
from tb_market_code;
--指定該結果集用於返回給調用者
declare c2 cursor with return to caller for
select market_code
from tb_market_code;
open c1;
open c2;
END P1
2、建一SP調該sp且使用它的結果集
CREATE PROCEDURE DB2INST1.Proc2 (
out out_market_code char(1))
LANGUAGE SQL
P1: BEGIN
declare loc1,loc2 result_set_locator varying;
--建立一個結果集數組
call proc1;
--調用該SP返回結果集。
associate result set locator(loc1,loc2) with procedure proc1;
--將返回結果集和結果集數組關聯
allocate cursor1 cursor for result set loc1;
allocate cursor2 cursor for result set loc2;
--將結果集數組分配給cursor
fetch cursor1 into out_market_code;
--直接從結果集中賦值
close cursor1;
END P1
本文來自CSDN博客,轉載請標明出處:http://blog.csdn.net/aawanghuan/archive/2008/02/20/2108951.aspx