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Part 1: Part Title
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Creating and Embedding Subforms
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Part 3: Creating Forms and Reports in a Desktop Application
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Part 1: Part Title
13 13 13 13 0 13
F13xx06
Figure 13-6. The relationships between companies, contacts, and products in the LawTrack Contacts application.
Specifying the Subform Source
You can embed up to 10 levels of subforms within another form (a form that has a subform that also has a subform, and so on). It s best to start by designing the innermost form and working outward because you must design and save an inner form before you can embed it in an outer one. In this exercise, you need to build a form on tblContactProducts, embed that in a form that shows data from tblCompanyContacts, and then finally embed that form and subform in a form to display contact information. But first, you must create the record sources for these subforms. Begin by designing the data source for the first subform. In the example described previously, you want to create or update rows in the tblContactProducts table to create, modify, or delete links between company contact records in the tblCompanyContacts table and products in the tblProducts table. You could certainly base the subform directly on the tblContactProducts table and display the product name via a combo box on the form that looks up the name based on the value in the ProductID field. However, the user might find it useful to have the current list price for the product displayed to be sure the product isn t being sold at the wrong price. To do that, you need a query linking tblContactProducts and tblProducts. Start by opening a new query in Design view. In the Show Table dialog box, add the field lists for the tblContactProducts and tblProducts tables to the Query window. You want to be able to update all the fields in the tblContactProducts table, so copy them to the design grid. You can do so by using the all fields indicator (*). Add the ProductName, CategoryDescription, UnitPrice, and TrialVersion fields from the tblProducts table.
Part 3: Creating Forms and Reports in a Desktop Application
Advanced Form Design Your query should look similar to the one shown in Figure 13-7. (This query is saved as qxmplContactProducts in the sample database.) Notice that the tblProducts table has a oneto-many relationship with the tblContactProducts table. This means that you can update any field in the tblContactProducts table (including all three primary key fields, as long as you don t create a duplicate row) because the tblContactProducts table is on the many side of the relationship. Save the query so that you can use it as you design the subform. You can save your query as qryContactProducts, as shown in Figure 13-7, or use the sample query.
F13xx07
Figure 13-7. A query for updating the tblContactProducts table from a subform while displaying related information from the tblProducts table.
Next, you need a query for the form to display the information from tblCompanyContacts. You ll embed a subform to display contact products in this form and ultimately embed this form in the outermost form to display contact data. Again, you could use the tblCompanyContacts table as the record source for this form, but you might want to display additional information such as company name and department name from the related tblCompanies table. You also want to restrict the rows displayed to the one row for each contact that defines the default company for the contact. Start a new query on the tblCompanyContacts table. Add the tblCompanies table to the design grid. You should see a link between the two tables on the CompanyID field in each. In the design grid, include the CompanyID, ContactID, Position, and DefaultForContact fields from tblCompanyContacts. Under the DefaultForContact field, enter a criterion of True to restrict the output to the records that define the default company for each contact. Add the CompanyName and Department fields from the tblCompanies table. Your query should look like the one shown in Figure 13-8 on the next page. (This query is saved as qxmplContactCompaniesDefault in the sample database.) Notice that the tblCompanies table has a one-to-many relationship with the tblCompanyContacts table. This means that you can update any field in the tblCompanyContacts table (including the primary key fields, as long as you don t create a duplicate row) because the tblCompanyContacts table is on the many side of the relationship. Save the query so that you can use it as you design your form. You can save your query as qryContactCompaniesDefault, as shown in Figure 13-8, or use the sample query. 489
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