问题
How can I use a parameter inside sql openquery, such as:
SELECT * FROM OPENQUERY([NameOfLinkedSERVER], 'SELECT * FROM TABLENAME
where field1=@someParameter') T1 INNER JOIN MYSQLSERVER.DATABASE.DBO.TABLENAME
T2 ON T1.PK = T2.PK
回答1:
From the OPENQUERY documentation it states that:
OPENQUERY does not accept variables for its arguments.
See this article for a workaround.
UPDATE:
As suggested, I'm including the recommendations from the article below.
Pass Basic Values
When the basic Transact-SQL statement is known, but you have to pass in one or more specific values, use code that is similar to the following sample:
DECLARE @TSQL varchar(8000), @VAR char(2)
SELECT @VAR = 'CA'
SELECT @TSQL = 'SELECT * FROM OPENQUERY(MyLinkedServer,''SELECT * FROM pubs.dbo.authors WHERE state = ''''' + @VAR + ''''''')'
EXEC (@TSQL)
Pass the Whole Query
When you have to pass in the whole Transact-SQL query or the name of the linked server (or both), use code that is similar to the following sample:
DECLARE @OPENQUERY nvarchar(4000), @TSQL nvarchar(4000), @LinkedServer nvarchar(4000)
SET @LinkedServer = 'MyLinkedServer'
SET @OPENQUERY = 'SELECT * FROM OPENQUERY('+ @LinkedServer + ','''
SET @TSQL = 'SELECT au_lname, au_id FROM pubs..authors'')'
EXEC (@OPENQUERY+@TSQL)
Use the Sp_executesql Stored Procedure
To avoid the multi-layered quotes, use code that is similar to the following sample:
DECLARE @VAR char(2)
SELECT @VAR = 'CA'
EXEC MyLinkedServer.master.dbo.sp_executesql
N'SELECT * FROM pubs.dbo.authors WHERE state = @state',
N'@state char(2)',
@VAR
回答2:
You can execute a string with OPENQUERY once you build it up. If you go this route think about security and take care not to concatenate user-entered text into your SQL!
DECLARE @Sql VARCHAR(8000)
SET @Sql = 'SELECT * FROM Tbl WHERE Field1 < ''someVal'' AND Field2 IN '+ @valueList
SET @Sql = 'SELECT * FROM OPENQUERY(SVRNAME, ''' + REPLACE(@Sql, '''', '''''') + ''')'
EXEC(@Sql)
回答3:
From the MSDN page:
OPENQUERY does not accept variables for its arguments
Fundamentally, this means you cannot issue a dynamic query. To achieve what your sample is attempting, try this:
SELECT * FROM
OPENQUERY([NameOfLinkedSERVER], 'SELECT * FROM TABLENAME') T1
INNER JOIN
MYSQLSERVER.DATABASE.DBO.TABLENAME T2 ON T1.PK = T2.PK
where
T1.field1 = @someParameter
Clearly if your TABLENAME table contains a large amount of data, this will go across the network too and performance might be poor. On the other hand, for a small amount of data, this works well and avoids the dynamic sql construction overheads (sql injection, escaping quotes) that an exec approach might require.
回答4:
Actually, We found a way to do this:
DECLARE @username varchar(50)
SET @username = 'username'
DECLARE @Output as numeric(18,4)
DECLARE @OpenSelect As nvarchar(500)
SET @OpenSelect = '(SELECT @Output = CAST((CAST(pwdLastSet As bigint) / 864000000000) As numeric(18,4)) FROM OpenQuery (ADSI,''SELECT pwdLastSet
FROM ''''LDAP://domain.net.intra/DC=domain,DC=net,DC=intra''''
WHERE objectClass = ''''User'''' AND sAMAccountName = ''''' + @username + '''''
'') AS tblADSI)'
EXEC sp_executesql @OpenSelect, N'@Output numeric(18,4) out', @Output out
SELECT @Output As Outputs
This will assign the result of the OpenQuery execution, in the variable @Output.
We tested for Store procedure in MSSQL 2012, but should work with MSSQL 2008+.
Microsoft Says that sp_executesql(Transact-SQL): Applies to: SQL Server (SQL Server 2008 through current version), Windows Azure SQL Database (Initial release through current release). (http://msdn.microsoft.com/en-us/library/ms188001.aspx)
回答5:
DECLARE @guid varchar(36); select @guid= convert(varchar(36), NEWID() );
/*
The one caveat to this technique is that ##ContextSpecificGlobal__Temp should ALWAYS have the exact same columns.
So make up your global temp table name in the sproc you're using it in and only there!
In this example I wanted to pass in the name of a global temporary table dynamically. I have 1 procedure dropping
off temporary data in whatever @TableSrc is and another procedure picking it up but we are dynamically passing
in the name of our pickup table as a parameter for OPENQUERY.
*/
IF ( OBJECT_ID('tempdb..##ContextSpecificGlobal__Temp' , 'U') IS NULL )
EXEC ('SELECT * INTO ##ContextSpecificGlobal__Temp FROM OPENQUERY(loopback, ''Select *,''''' + @guid +''''' as tempid FROM ' + @TableSrc + ''')')
ELSE
EXEC ('INSERT ##ContextSpecificGlobal__Temp SELECT * FROM OPENQUERY(loopback, ''Select *,''''' + @guid +''''' as tempid FROM ' + @TableSrc + ''')')
--If this proc is run frequently we could run into race conditions, that's why we are adding a guid and only deleting
--the data we added to ##ContextSpecificGlobal__Temp
SELECT * INTO #TableSrc FROM ##ContextSpecificGlobal__Temp WHERE tempid = @guid
BEGIN TRAN t1
IF ( OBJECT_ID('tempdb..##ContextSpecificGlobal__Temp' , 'U') IS NOT NULL )
BEGIN
-- Here we wipe out our left overs if there if everyones done eating the data
IF (SELECT COUNT(*) FROM ##ContextSpecificGlobal__Temp) = 0
DROP TABLE ##ContextSpecificGlobal__Temp
END
COMMIT TRAN t1
-- YEAH! Now I can use the data from my openquery without wrapping the whole !$#@$@ thing in a string.
回答6:
SELECT field1 FROM OPENQUERY
([NameOfLinkedSERVER],
'SELECT field1 FROM TABLENAME')
WHERE field1=@someParameter T1
INNER JOIN MYSQLSERVER.DATABASE.DBO.TABLENAME
T2 ON T1.PK = T2.PK
回答7:
Combine Dynamic SQL with OpenQuery. (This goes to a Teradata server)
DECLARE
@dayOfWk TINYINT = DATEPART(DW, GETDATE()),
@qSQL NVARCHAR(MAX) = '';
SET @qSQL = '
SELECT
*
FROM
OPENQUERY(TERASERVER,''
SELECT DISTINCT
CASE
WHEN ' + CAST(@dayOfWk AS NCHAR(1)) + ' = 2
THEN ''''Monday''''
ELSE ''''Not Monday''''
END
'');';
EXEC sp_executesql @qSQL;
回答8:
In the following example I'm passing a department parameter to a stored procedure(spIncreaseTotalsRpt) and at the same time I'm creating a temp table all from an OPENQUERY. The Temp table needs to be a global Temp (##) so it can be referenced outside it's intance. By using exec sp_executesql you can pass the department parameter.
Note: be careful when using sp_executeSQL. Also your admin might not have this option available to you.
Hope this helps someone.
IF OBJECT_ID('tempdb..##Temp') IS NOT NULL
/*Then it exists*/
begin
DROP TABLE ##Temp
end
Declare @Dept as nvarchar(20) ='''47'''
declare @OPENQUERY as nvarchar(max)
set @OPENQUERY = 'Select ' + @Dept + ' AS Dept, * into ##Temp from openquery(SQL_AWSPROD01,'''
declare @sql nvarchar(max)= @openquery + 'SET FMTONLY OFF EXECUTE SalaryCompensation.dbo.spIncreaseTotalsRpts ' + '''' + @Dept + '''' + ''')'
declare @parmdef nvarchar(25)
DECLARE @param nvarchar(20)
SET @parmdef = N'@Dept varchar(20)'
-- select @sql
-- Print @sql + @parmdef + @dept
exec sp_executesql @sql,@parmdef, @Dept
Select * from ##Temp
Results
Dept increase Cnt 0 1 2 3 4 5 6 0.0000 1.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
回答9:
I figured out a way that works for me. It does require the use of a scratch table that a linked server has access to though.
I created a table and populated it with the values I need then I reference that table through a linked server.
SELECT *
FROM OPENQUERY(KHSSQLODSPRD,'SELECT *
FROM ABC.dbo.CLAIM A WITH (NOLOCK)
WHERE A.DOS >= (SELECT MAX(DATE) FROM KHSDASQL01.DA_MAIN.[dbo].[ALLFILENAMES]) ')
回答10:
Simple example based off of @Tuan Zaidi's example above which seemed the easiest. Didn't know you can do the filter on the outside of OPENQUERY... so much easier!
However in my case I needed to stuff it in a variable so I created an additional Sub Query Level to return a single value.
SET @SFID = (SELECT T.Id FROM (SELECT Id, Contact_ID_SQL__c FROM OPENQUERY([TR-SF-PROD], 'SELECT Id, Contact_ID_SQL__c FROM Contact') WHERE Contact_ID_SQL__c = @ContactID) T)
回答11:
declare @p_Id varchar(10)
SET @p_Id = '40381'
EXECUTE ('BEGIN update TableName
set ColumnName1 = null,
ColumnName2 = null,
ColumnName3 = null,
ColumnName4 = null
where PERSONID = '+ @p_Id +'; END;') AT [linked_Server_Name]
来源：https://stackoverflow.com/questions/3378496/including-parameters-in-openquery