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In the second part of this chapter, let s cover a number of design issues, beginning with a common one: the use of stored procedures and temp tables.
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Using stored procedures and temp tables is the number one problem I address on the newsgroups. I use temp tables successfully and extensively with both SQL Server and Sybase. If you follow these guidelines, it ll work for you: If your field list isn t showing up, then in RS 2000 and RS 2005, go to the Data tab and click on the Refresh Fields button, which is to the right of the dataset drop-down box. If you re in RS 2008, pull up the dataset properties by doubleclicking on the dataset and click on the Refresh Fields command button. Don t explicitly drop the temp tables. Let the temp tables fall out of scope. It s not necessary to explicitly drop the tables, as SQL Server will properly dispose of them when they re no longer needed. If you do explicitly drop them, the stored procedure won t work with RS. Have your last statement be a SELECT. If none of these work, then add SET FMTONLY OFF. Simon Sabin, a SQL Server MVP, provided me with this tip a long time ago. Here s his explanation: The issue with RS is that the rowset of the SP is defined by calling the SP with SET FMTONLY ON because temp tables don t get created if you select from the temp table the metadata from the rowset can t be returned. Turning FMTONLY OFF in the SP bypasses this issue. I ve found this to only be an issue when you create a temp table in your stored procedure that s then filled with data from another stored procedure.
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You create this beautiful report that your users export to Excel. They want to sort the data, but they bump up against the dreaded merged cell problem and they can t sort
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the data. What happens is that when RS renders to Excel, it tries to make the Excel spreadsheet look as close as possible to the original report. In doing this, Reporting Services ends up creating merged cells, which prevents Excel from allowing the sorting of the data. Two design solutions are available. One has to do with lining up freestanding text boxes so that the Reporting Services renderer doesn t create a spreadsheet with merged cells. I have a much easier solution: remove any freestanding text boxes such as those put in by the report wizard. I then add additional header lines to the table control, and put my report titles, parameter information, and so forth in these additional headers. You can merge cells together and this won t cause a problem on export to Excel. RS 2008 renders reports to Excel more completely than previous versions. On one hand, this is good. Previously, if you had a subreport in a cell of a table object when you exported it, RS would put an error message in the cell of the spreadsheet. RS 2008 now renders the subreport correctly by putting the subreport into the appropriate spreadsheet cell. Unfortunately, this can cause the merged cell problem discussed previously. I haven t found a workaround for this.
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Exporting to Excel is one of RS s strengths. It allows users to build on the data in the report by performing additional analysis or building their own charts. Eventually, a lot of work gets put into these spreadsheets and users want to share them with others on a wider scale. You have several options at this point. One possibility is to use the spreadsheet as the specification for designing a report that does the same thing. Another option is to pull the report data into Excel. Excel has a couple of ways to do this. One way is to create a connection to the database and execute the query or stored procedure from within Excel. This can be done by either using Excel s support for creating the query or writing VBA code to pull in the data. Neither was what I was looking for. Creating the query required creating a database source name (DSN) on each computer. Writing VBA code required either embedding a username and password or using integrated security. As I said earlier, I try to touch the database as little as possible where it comes to security. I have only a single read-only user that s used by RS. That brings us to the possibility of using web queries. Web queries are an Excel feature that allows you to enter a URL during the design process of the web query; then Excel presents the web page and you pick the part you want to bring in. I put in a URL in the same format as used for the Jump to URL field and pick the table of data I m interested in. The first problem is that it only brings in the first page of data. This is resolved by setting the interactive height for the report to 0, which includes all the data returned with no paging. It works great. If all you want to do is perform a one-off data load when the spreadsheet is open, you have a URL that will work for your purposes. But if you want to allow refreshing the data, this solution won t work. What happens is the link being used by Excel is tied to the session being maintained by RS. Once enough time has passed that the session has timed out, Excel can no longer refresh the data.
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