--一个关于“OLE DB 提供程序'sqloledb' 指出该对象中没有任何列”错误的解决方法
--在网上看到一个网友提问把系统过程的结果输出到文本文件,心想这不简单呀,bcp+openrowset呀轻松解决呀,本着认真的态度(其实是怕写个错误的让人家笑话我)我在我的查询分析器里写个试:
USE mydb
GO
--1
SELECT *
FROM OPENROWSET('SQLOLEDB','SERVER=.;UID=sa;PWD=123','exec mydb.dbo.sp_helpsrvrolemember')
--2
SELECT *
FROM OPENROWSET('sqloledb','Trusted_Connection=yes','exec mydb..sp_helpsrvrolemember ')
/*
F5一运行,完了,出丑了
服务器: 消息7357,级别16,状态2,行1
未能处理对象'exec mydb.dbo.sp_helpsrvrolemember'。OLE DB 提供程序'SQLOLEDB' 指出该对象中没有任何列。
OLE DB 错误跟踪[Non-interface error: OLE DB provider unable to process object, since the object has no columnsProviderName='SQLOLEDB', Query=exec mydb.dbo.sp_helpsrvrolemember']。
这老写的语法怎么会报错呢,自己写一个过程试试,一试更呆了
*/
GO
create proc pr_test
as
begin
select * from tb
end
go
SELECT *
FROM OPENROWSET('sqloledb','Trusted_Connection=yes','exec mydb..pr_test')
drop proc pr_test
/*
TypeID Type
----------- ----
1 t1
2 t2
3 t3
4 t4
(所影响的行数为4 行)
*/
--结果是想的,那为什么这个系统过程不行呢?那先看看这个过程是什么东东:
USE MASTER
GO
sp_helptext 'master..sp_helpsrvrolemember'
/*
Text
------------------------------------------
CREATE PROCEDURE sp_helpsrvrolemember
@srvrolename sysname = NULL
AS
if @srvrolename is not null
begin
-- VALIDATE GIVEN NAME
if not exists (select * from master.dbo.spt_values
where name = @srvrolename and low = 0 and type = 'SRV')
begin
raiserror(15412, -1, -1, @srvrolename)
return (1)
end
-- RESULT SET FOR SINGLE SERVER-ROLE
select 'ServerRole' = spv.name, 'MemberName' = lgn.name, 'MemberSID' = lgn.sid
from master.dbo.spt_values spv, master.dbo.sysxlogins lgn
where spv.name = @srvrolename and
spv.low = 0 and
spv.type = 'SRV' and
lgn.srvid IS NULL and
spv.number & lgn.xstatus = spv.number
end
else
begin
-- RESULT SET FOR ALL SERVER-ROLES
select 'ServerRole' = spv.name, 'MemberName' = lgn.name, 'MemberSID' = lgn.sid
from master.dbo.spt_values spv, master.dbo.sysxlogins lgn
where spv.low = 0 and
spv.type = 'SRV' and
lgn.srvid IS NULL and
spv.number & lgn.xstatus = spv.number
end
return (0) -- sp_helpsrvrolemember
*/
--一看,哦,难道这个结果因为输入参数不同而有不同select来返回影响了?或是为空时raiserror 没有select 结果集吗?好办,我们再试:
use mydb
go
alter proc pr_test
@p int =null
as
begin
if @p is null
select * from tb
else
return 0
return 1
end
go
create proc pr_test1
@p int =null
as
begin
if @p is not null
return 0
else
select * from tb
return 1
end
go
create proc pr_test2
@p int =null
as
begin
if @p is not null
return 0
else
select * from tb
return 1
end
go
SELECT *
FROM OPENROWSET('sqloledb', 'Trusted_Connection=yes','exec mydb..pr_test')
SELECT *
FROM OPENROWSET('sqloledb', 'Trusted_Connection=yes','exec mydb..pr_test 1')
SELECT *
FROM OPENROWSET('sqloledb', 'Trusted_Connection=yes','exec mydb..pr_test1')
SELECT *
FROM OPENROWSET('sqloledb', 'Trusted_Connection=yes','exec mydb..pr_test2')
drop proc pr_test,pr_test1,pr_test2
--通过以上的测试,结果很明显了,也就是查询语句对过程可能的结果集进行了分析,特别第一个过程带参与不带参的结果就很明显了,上网一gg,问的人还真不少,好多人期待进行改进,难道就真的不行了?,通过查sql2000的联机帮助,发现这个设置项,很管用,哈哈
/*
SET FMTONLY
只将元数据返回给客户端。
语法
SET FMTONLY { ON | OFF }
注释
当SET FMTONLY 为ON 时,将不对行进行处理,也不将行作为请求的结果发送到客户端。
SET FMTONLY 的设置是在执行或运行时设置,而不是在分析时设置。
很显然,这个开关项正是我们所想要分析器应该执行的结果,好试一下吧:
*/
SELECT *
FROM OPENROWSET('SQLOLEDB','DRIVER={SQL Server};SERVER=.;UID=sa;PWD=123','set fmtonly off;exec mydb.dbo.sp_helpsrvrolemember') AS a
SELECT *
FROM OPENROWSET('SQLOLEDB','SERVER=.;UID=sa;PWD=123','set fmtonly off;exec mydb.dbo.sp_helpsrvrolemember') AS a
EXEC master..xp_cmdshell
'bcp "select * from OPENROWSET(''SQLOLEDB'',''SERVER=.;UID=sa;PWD=123'',''set fmtonly off;exec mydb.dbo.sp_helpsrvrolemember'') AS a " queryout c:\Authors.txt -c -S. -Usa -P'
/*
ServerRole MemberName MemberSID
----------------------------------- ------------------- ------
sysadmin BUILTIN\Administrators 0x01020000000000052000000020020000
sysadmin sa 0x01
(所影响的行数为2 行)
ServerRole MemberName MemberSID
--------------------- ----------- ---------------------------
sysadmin BUILTIN\Administrators 0x01020000000000052000000020020000
sysadmin sa 0x01
(所影响的行数为2 行)
output
-------------------
NULL
开始复制...
NULL
已复制了2 行。
数据包的大小(字节): 4096
时钟时间(毫秒): 共 10
NULL
(所影响的行数为7 行)
*/
--在sql2005内确实进行了改进,下面二种写法都可以得到结果:
SELECT *
FROM OPENROWSET('SQLNCLI','Server=.\sql2005;Trusted_Connection=yes','exec testcsdn..sp_helpsrvrolemember')as a
SELECT *
FROM OPENROWSET('SQLOLEDB','DRIVER={SQL Server};SERVER=.\sql2005;UID=sa;PWD=123flystone','exec testcsdn.dbo.sp_helpsrvrolemember') AS a
文章载至:http://blog.csdn.net/happyflystone/archive/2009/09/14/4551247.aspx