oracle数据库转换到Sqlserver的几点经验

应广大朋友的要求，本人将《PB-ORACLE通用开发框架2.1》版本的程序
成功转换到SQLServer下，下面是我总结的几条经验，与大家分享，有不
正确的地方，请批评指正。谢谢！kingfriend1111@163.com
1.数据类型的转换 建立两个数据源basedb, basdb_sql
为每个表，建立一个数据管道，修改部分字段类型
Oracle SQLServer
varchar2 varchar

blob image
2.函数的转换

ORACLE SQLServer
to_char(readingdate,’yyyymm’) convert(char(6),readingdate,111)
to_char(readingdate,’yyyy/mm’) convert(char(7),readingdate,112)
decode( , , , ,) case when then end 或者 isnull(x,0)
左右连接 (+) left outer join
nvl(field1,'') isnull(field1,'')
举例子如下：
oracle:
SELECT EFMFID,
EFMMID,
EFMNAME,
EFMMETHOD,
EFMUPPICT,
EFMDNPICT,
EFMCHECK,
EFMVISIBLE,
EFMHINT,
EFMMICOHELP,
EFMTBITEMINDEX,
EFMTBITEMORDER,
EFMTBITEMSPACE,
DECODE(ORFMRID,NULL,'N','Y') FLAG
FROM ERPFUNCMETHOD,
(SELECT ORFMRID,ORFMFID,ORFMETHOD
FROM OPERRFMETHOD WHERE ORFMRID=:v_role)
WHERE EFMFID=ORFMFID(+) AND EFMMID=ORFMETHOD(+) AND EFMFID=:v_func
ORDER BY EFMTBITEMORDER
-----------------------------------
sqlserver:
SELECT A.EFMFID,
A.EFMMID,
A.EFMNAME,
A.EFMMETHOD,
A.EFMUPPICT,
A.EFMDNPICT,
A.EFMCHECK,
A.EFMVISIBLE,
A.EFMHINT,
A.EFMMICOHELP,
A.EFMTBITEMINDEX,
A.EFMTBITEMORDER,
A.EFMTBITEMSPACE,
case IsNUll(B.ORFMRID,'*')
when '*' then 'N'
else 'Y'
end FLAG
FROM ERPFUNCMETHOD AS A
LEFT OUTER JOIN
(SELECT ORFMRID,ORFMFID,ORFMETHOD
FROM OPERRFMETHOD WHERE ORFMRID = :v_role ) AS B
ON A.EFMFID=B.ORFMFID AND A.EFMMID=B.ORFMETHOD
WHERE A.EFMFID = :v_func
ORDER BY A.EFMTBITEMORDER;
3. 数据窗口中的语法
在测试的过程会发现有一些数据窗口在 SqlServer不能用：修改方法是将字段的引号去掉
4. 取服务器时间
ORACEL
-------------------------------------------
datetime ld_today
declare cur cursor for select getdate();
open cur;
fetch cur into :ld_today;
close cur;
IF SQLCA.SQLCODE <> 0 THEN
MESSAGEBOX('错误信息', SQLCA.SQLERRTEXT)
END IF
return ld_today
SQLSERVER:
---------------------------------------------
date ld_today
SELECT SYSDATE INTO :Ld_TODAY FROM DUAL;
IF SQLCA.SQLCODE <> 0 THEN
MESSAGEBOX('错误信息', SQLCA.SQLERRTEXT)
END IF
return ld_today
5.函数的转换
尽量不要使用select count(*),而由EXISTS 来代替
ORACEL
-------------------------------------------
CREATE OR REPLACE FUNCTION fChkRoleFunc
(Vrole IN VARCHAR2,vcode IN VARCHAR2)
Return Integer
AS
lpcode Integer;
BEGIN
SELECT COUNT(*) INTO lpcode FROM operrolefunc
WHERE orfrid=vrole AND orffid = vcode;
Return lpcode;
EXCEPTION WHEN OTHERS THEN
lpcode := 0;
Return lpcode;
END;

SQLSERVER:
---------------------------------------------
CREATE FUNCTION fChkRoleFunc
(@Vrole VARCHAR(2), @vcode VARCHAR(10))
Returns Int
AS
BEGIN
DECLARE @lpcode Int
IF EXISTS( SELECT * FROM operrolefunc WHERE orfrid=@vrole AND orffid = @vcode)
set @lpcode = 1
else
set @lpcode = 0
RETURN (@lpcode)
END
6. 取本机IP
在ORACLE中是利用系统对象获得
//登录数据库客户端名称
SELECT sys_context('USERENV','HOST')
INTO :gs_workstation
FROM dual;
gs_workstation=mid(gs_workstation,pos(gs_workstation,'/')+1,len(gs_workstation) - pos(gs_workstation,'/'))
//登录数据库客户端IP
SELECT sys_context('USERENV','IP_ADDRESS')
INTO :gs_ws_ip
FROM dual;
在SQLServer版本是用winsock.pbl和pslib5.dll 完成的
增加了一个函数f_ip_sock