Question

I am using the following T-SQL query in SQL server 2005 (Management Studio IDE):

DECLARE @id int; DECLARE @countVal int; DECLARE @sql nvarchar(max); SET @id = 1000; SET @sql = 'SELECT COUNT(*) FROM owner.myTable WHERE id = @id'; EXEC (@sql) AT oracleServer -- oracleServer is a lined server to Oracle 

I am not sure how to pass the input parameter @id to the EXEC query, and pass the count result out to @countVal. I saw some examples for Microsoft SQL server like:

EXEC (@sql, @id = @id) 

I tried this for Oracle but I got a statement error:

OLE DB provider 'OraOLEDB.Oracle' for linked server 'oracleServer'  returned message 'ORA-00936: missing expression' 

Answer 1

Try this:

EXEC sp_executesql @sql, N'@id int', @id 

More info at this great article: http://www.sommarskog.se/dynamic_sql.html

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As for the output, your SELECT needs to look something like this:

SELECT @countVal = COUNT(id) FROM owner.myTable WHERE id = @id 

I’m selecting ‘id’ instead of ‘*’ to avoid pulling unnecessary data…

Then your dynamic sql should be something like this:

EXEC sp_executesql @sql,                     N'@id int, @countVal int OUTPUT',                     @id,                     @countVal OUTPUT 

This example is adapted from the same article linked above, in the section sp_executesql.

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As for your Oracle error, you will need to find out the exact SQL that sp_executesql is sending to Oracle. If there is a profiler or query log in Oracle, that may help. I have limited experience with Oracle, but that would be the next logical step for troubleshooting your problem.