下面是對於建立db2儲存過程的乙個示例，正在入手這項學習的朋友可以參考。
在db2命令列中進行操作:
1.開始-執行,輸入cmd,執行db2cw命令進入db2命令列模式
2.再輸入db2後,便可以輸入sql語句進行執行;如果不輸入,則需要db2 "sql語句"來執行
備註,命令回車提示成功後,對於insert則一定要進行commit,否則無效
--建立表結構
db2 "create table tablename as (select row_number(),zd from tablename2) definition only"
--建立新錶
db2 "create table tablename(a varchar(14))"
--刪除表
db2 "drop table table_name"
--向表中插入資料
db2 "insert into tablename(zd1,zd2,zd3,zd4,zd5) values ('aaaaa','110','1111','2222','2012-09-11')"
--查詢表中資料
db2 "select * from tablename"
--刪除表中前10000萬記錄
db2 "delete from (select * from tablename fetch first 10000 rows only) where 1=1"
--提交
db2 "commit"
--查詢系統當前時間
db2 "select current time from sysibm.sysdummy1"
--查詢表中總記錄數
db2 "select count(0) from tablename"
db2 "select current time from sysibm.sysdummy1"
db2 "call 儲存過程名()"--呼叫儲存過程
db2 "commit"--提交
db2 "select current time from sysibm.sysdummy1"
====編寫乙個儲存過程造資料,5個字段(1個日期型別[值相對固定],3個字段隨機從已存在的表中取,1個字段同另1欄位一起作主鍵)
分析與結果:
沒接觸過db2的話,看看當前不會的知識點
1.如何對現有表的字段值進行隨機取值
select int(rand()*100) from sysibm.sysdummy1;
2.如何找到db2類似於oracle的rownum唯一物理行
select zd, row_number() over(order by zd desc) as rownum from ora_table1;
select zd from (select zd, row_number() over(order by zd desc) as rownum from ora_table1 ) where rownum=100;
3.db2中的迴圈語法,儲存過程的結構是什麼
while i<10 do
--sql語句
set i=i+1;
end while;
可以在db2的samples資料夾中找到whiles.db2例項進行參考
4.如何執行儲存過程
命令列模式中輸入
db2 -td@ -vf whiles.db2
db2 "call dept_median(51, ?)--若無引數,則db2 "call dept_median()"
====結果(優化中)
create procedure test_pro()
language sql
begin
declare i int default 1001;
declare aa int default 1;
declare t int;
declare total_605 int;
declare total_606 int;
declare total_need_code int;
declare a605 char(3);
declare a606 char(4);
declare abankcode char(14);
select count(need_zd)+1 into total_605 from ora_dictionary where type_a='605';
select count(need_zd)+1 into total_606 from ora_dictionary where type_a='606';
select count(need_code)+1 into total_need_code from table_info;
while i<=10000 do
select int(rand()*(total_605+1)) into t from sysibm.sysdummy1;
select need_zd into a605 from (select need_zd, row_number() over(order by need_zd desc) as rownum from ora_dictionary where type_a='605' ) where rownum=t;
select int(rand()*(total_606+1)) into t from sysibm.sysdummy1;
select need_zd into a606 from (select need_zd, row_number() over(order by need_zd desc) as rownum from ora_dictionary where type_a='606' ) where rownum=t;
select int(rand()*(total_need_code+1)) into t from sysibm.sysdummy1;
select need_code into abankcode from (select need_code, row_number() over(order by need_code desc) as rownum from table_info ) where rownum=t;
insert into czystru(zd1,zd2,zd3,zd4,zd5) values(char(aa),a605,a606,abankcode,'2010-08-03');
if (mod(i,1000)=0)
then
commit;
end if;
set aa=aa+1;
set i=i+1;
end while;
end @
====db2自帶的whiles.db2例子
create procedure dept_median
(in deptnumber smallint, out mediansalary double)
language sql
begin
declare sqlcode integer;
declare sqlstate char(5);
declare v_numrecords int default 1;
declare v_counter int default 0;
declare v_mod int default 0;
declare v_salary1 double default 0;
declare v_salary2 double default 0;
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;
-- initialize out parameter
set mediansalary = 0;
select count(*) into v_numrecords from staff
where dept = deptnumber;
open c1;
set v_mod = mod(v_numrecords, 2);
case v_mod
when 0 then
while v_counter < (v_numrecords / 2 + 1) do
set v_salary1 = v_salary2;
fetch c1 into v_salary2;
set v_counter = v_counter + 1;
end while;
set mediansalary = (v_salary1 + v_salary2)/2;
when 1 then
while v_counter < (v_numrecords / 2 + 1) do
fetch c1 into mediansalary;
set v_counter = v_counter + 1;
end while;
end case;
end @
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