incluant des paramètres dans OPENQUERY

Question

Comment puis-je utiliser un paramètre à l'intérieur de sql openquery, tel que :

SELECT * FROM OPENQUERY([NameOfLinkedSERVER], 'SELECT * FROM TABLENAME
where field1=@someParameter') T1 INNER JOIN MYSQLSERVER.DATABASE.DBO.TABLENAME
T2 ON T1.PK = T2.PK

Answer 1

Vous pouvez exécuter une chaîne avec OPENQUERY une fois que vous l'avez créée. Si vous suivez cette voie, pensez à la sécurité et veillez à ne pas concaténer le texte saisi par l'utilisateur dans votre 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)

Answer 2

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.