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Figure 19-15. A more descriptive request for a parameter value.
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But what if they don t know the name of the company What if a company name begins with an article, such as The Microsoft Corporation, and the user gets frustrated when entering the letter M produces an incorrect result One solution is to create a separate form with a combo box or list box that provides a list containing all the company names. Then the user could select a value from the list, and you can specify an Input Parameters setting that resolves the query parameter by referencing the value that the user selects. In the sample database, you can find a form, fdlgXmplCompanyParm, that provides a list of company names in a combo box called cmbCompany. You can open the form and select a company name from the list, as shown in Figure 19-16 on the next page. Click OK, and a form opens to display the company you selected, as shown in Figure 19-17 on the next page. This form, frmXmplCompanesParmFromForm, uses the same parameter stored procedure as its record source. But notice that Access didn t prompt for the parameter. 699
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Part 4: Designing an Access Project
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Part 00: Part Title
Microsoft Office Access 2003 Inside Out
Part 4: Designing an Access Project
19
F19qq16.bmp
Figure 19-16. Choosing a value from a combo box on a form that resolves a stored procedure parameter.
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F19QQ17.bmp
Figure 19-17. A form using a parameter query, and the parameter is resolved from a value chosen from a list in another form.
The secret is that the form s Input Parameters property has a special setting, as follows:
@Enter_Company_Name nvarchar(50) = [Forms]![fdlgXmplCompanyParm]![cmbCompany]
The interesting value assigned to the parameter is a reference to the combo box on the fdlgXmplCompanyParm form. This special syntax asks Access to look at all the open forms ([Forms]!), find the form named fdlgXmplCompanyParm, and then find the control on the form named cmbCompany. In truth, the fdlgXmplCompanyParm form has a little bit of Visual Basic code behind the two command buttons to make the example run smoothly. But the critical lesson is the special syntax that you can use in input parameters to redirect resolution of the parameter value to the value in a control on another form. For more details about Visual Basic and the rules for referencing objects in Access, see 22, Understanding Visual Basic Fundamentals. You should now have a good understanding of the differences between forms in an Access project file (.adp) and those in a desktop database (.mdb). In the next chapter, you ll learn about the differences for reports.
Part 1: Part Title
20
Building Reports in an Access Project
Understanding Report Differences in an Access Project . . . . . . . . . . . . . . . . . . . . .701 Working with Server Filters . . . . . . . . . 703 Working with Input Parameters . . . . . . . 705
As you learned in the previous chapters on Access projects, the most noticeable differences between Access desktop databases (.mdb) and Access project files (.adp) are in the tables and queries (views, functions, and stored procedures). You need to consider only a few differences when working with forms and even fewer when working with reports. As with forms, reports in an Access project are nearly identical to reports in an Access desktop database. You can get started building most reports without knowing any details about the differences. In the last chapter, you learned about how different types of queries used as record sources can affect the way you build your forms. The same is true for reports. Because you are working with data from SQL Server, it is important to understand the key differences of each query type and how to maximize their efficiency when using them as record sources in your reports. Note This chapter assumes that you have already read the earlier chapters on report design (s 14, 15, and 16) and have a good grasp of the basic report design concepts. You should be familiar with the report designer and know how to create reports that allow you to view grouped and/or aggregate data. You can find the examples discussed in this chapter in the project file version of the LawTrack Contacts sample application, Contacts.adp, on the companion CD.
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