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You now know how to copy old contact event and contact product data to an archive table, and how to delete the old contact events from the main table. In some applications, you might want to delete more than just the event records. For example, in an order entry database, you might want to archive and delete old customers who haven t given you any business in more than two years. In the LawTrack Contacts application, you can mark old contacts as inactive so that they disappear from the primary forms you use to edit the data. In an earlier section, Updating Groups of Rows, I showed you how to identify contacts who haven t had any activity in a specified period of time and set the Inactive field so they don t show up anymore. Because of this feature, archiving and deleting old contacts isn t an issue. However, you might still want to delete old contact events and contact products that you have archived. I just showed you how to create a delete query to remove rows, but there s a safer way to do it if you have copied the rows elsewhere. Go back to the query you have been building and add tblContactEventsHistory. Create a join line between the ContactID field in tblContactEvents and the ContactID field in tblContactEventsHistory. Create another join line between the ContactDateTime field in tblContactEvents and the same field in tblContactEventsHistory. Your query should now look like Figure 9-29.

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Then the constant needs to be assigned an initial value when the user form is initially loaded. There are two ways to do this. The easiest way is just to assign it a valid row number such as 3 and then call GetData to load the initial values into the form. So, use the following code to create the UserForm_Initialize event.

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If users want to see the last line in the form, they will need to press the Last button. There are several ways to locate the last row in response to the user clicking the Last button. One way would be to scan through all of the data looking for the first empty cell in column one each time the Last button was clicked. A better way would be to scan through the worksheet and locate the first blank cell in column 1 and assign the value to LastRow, which is what the routine shown in the following listing does. This routine is located in the user form module.

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The FindLastRow function scans through the worksheet to find the first cell that doesn t have a value. A simple While loop iterates through each cell in column one of the worksheet, and the length of the return value is tested to see if the length is zero. If the length is zero, the loop will end and r will point to the last row in the worksheet, which is the first blank row follow ing the data in the worksheet. 426

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Microsoft Office Access 2003 Inside Out Remember that the default for a join is to include rows only where the values in both tables match. Now your delete query won t return any rows from tblContactEvents (where you re performing the delete) unless the row already exists in tblContactEventHistory! Run this query now and reply with any date you like. The query won t delete rows from tblContactEvents unless a copy is safely ensconced in the archive table. You can find this query saved as qxmplDeleteOldContactEventsSafe in the sample database. There s also a companion query, qxmplDeleteOldContactProductsSafe, to deal with contact products.

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Access analyzes your action query request and the data you are about to change before it commits changes to your database. When it identifies errors, Access always gives you an opportunity to cancel the operation.

Creating Advanced User Forms Then you can set the LastRow variable by adding the following line to the UserForm_Initialize event.

This type of error occurs if you attempt to append a record to a table or update a record in a table that would result in a duplicate primary key or a duplicate of a unique index key value Access will not update or append any rows that would create duplicates For example, if the primary key of a contact event archive table is ContactID and ContactDateTime, Access won t append a record that contains a ContactID and ContactDateTime already in the table Before attempting to append such rows, you might have to modify your append query to not select the duplicate rows This type of error occurs if you attempt to append data to an existing table and the data type of the receiving field does not match that of the sending field (and the data in the sending field cannot be converted to the appropriate data type).

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