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Generation Code 128 Code Set B in Visual Studio .NET Part 1: Part Title

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Also keep in mind that you must declare that any parameters and parameter names must begin with the @ character and follow the rules for names in SQL Server. In general, you should keep parameter names short and simple, and the first 30 characters must uniquely define the parameter within a function or stored procedure. Remember from 19, Designing Forms in an Access Project, and 20, Building Reports in an Access Project, that it s a simple matter to use the Input Parameters property of a form or report to supply parameter values to SQL Server functions and stored procedures.
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Changing Functions to Views
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Because functions can handle a wider range of queries than can views, the Upsizing Wizard attempts to upsize most SELECT queries as functions. As noted earlier, the best-designed client/server applications open all forms and reports that display data with a filter to fetch only the data needed. In an Access application, the most common way to do this is to use the WhereCondition parameter with an OpenForm or OpenReport command to supply a filter. When the form or report you are opening is based on a view in a project file, Access can send the filter directly to the server, and it sets the form or report Server Filter property to indicate that it has done so. However, when a form or report uses a function or a stored procedure as its record source, the only way to ask the server to filter the rows before it sends them back to the client machine is by using a parameter. When your code uses the more common WhereCondition technique, Access must send a command to the server to execute the function or stored procedure, and the server returns all the rows to the client. Access then applies the filter specified in the WhereCondition on the client machine and sets the form or report Filter and FilterOn properties. Filtering the rows after they have all been fetched from the server doesn t save any resources at all! So, you should convert to a view most non-parameter queries that the wizard upsized as functions. For example, the Upsizing Wizard converted qryCompanies and qryContacts both of which are used in forms that are opened with WhereCondition filters to functions. To convert a simple function back to a view, perform the following steps:
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1 Rename the function to something else for example, append old to the name. (SQL
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Server won t let you save a function and a view with the same name.)
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2 Open the function in Design view and open the SQL pane. Copy the SQL to the Clipboard.
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Part 7: After Completing Your Application
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Upsizing a Desktop Application to a Project
SQL pane into one of the other panes. If the SQL designer accepts the SQL as a view, you ll see it translate the SQL into the diagram and grid panes with no errors. If you get an error, you might not be able to convert the function to a view.
5 If the query designer displayed no error, save the new view using the previous query
name. Run the view to verify that it returns the result you expect.
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Fixing Parameter Names in Functions and Stored Procedures
When the Upsizing Wizard successfully converts parameter queries, it changes the parameter names to follow SQL Server naming conventions. When the parameter is a reference to a control on a form, it removes the brackets around the parts of the parameter name and inserts underscore characters. It also truncates the name to 30 characters if the resulting name is longer. For example, the wizard converts the original parameter in the qryContactProductsForInvoice query from [Forms]![frmInvoices]![InvoiceID] to @Forms__frmInvoices__InvoiceI. Of course, SQL Server doesn t have a clue that this parameter is originally a reference to a form control in Access, so Access prompts you for this parameter value if you try to open the query, even if frmInvoices is open. You ll see in the next section that you ll resolve most parameters by supplying the parameter value in the Input Parameters property of the form or report that uses a parameter query or by supplying the parameter value in additional Visual Basic code that you write. An unwieldy name like this makes little sense, so you should fix names like this in parameter queries to something more reasonable. In the final query in the sample ContactsSQL.mdf database, you ll find that I changed the parameter name to @InvoiceNum. Note that I could not use @InvoiceID because InvoiceID is also the name of one of the columns in the tblContactProducts table used in the query. When you use a function that includes a parameter as the row source of a combo box or a list box, Access can resolve the parameter for you as long as the parameter name matches the name of another control on the form. One such query in the sample database is the qlkpProductsForContacts function. However, the Upsizing Wizard changes the complex parameter name [Forms]![frmContacts]![fsubContactProducts].[Form]![cmbCategoryDescription] to @Forms__frmContacts__fsubCont. If you change the parameter name to simply @cmbCategoryDescription and make a minor change on the form, the new parameter function works just fine.
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