vb.net pdf417 free Part 2: Building a Microsoft Access Desktop Application in .NET framework

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Part 2: Building a Microsoft Access Desktop Application
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Troubleshooting Action Queries
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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.
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Solving Common Action Query Errors and Problems
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Access identifies (traps) four types of errors during the execution of an action query.
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Duplicate primary keys
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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). For example, this error will occur if you attempt to append a text field to an integer field and the text field contains either alphabetic characters or a number string that is too large for the integer field. You might also encounter a conversion error in an update query if you use a formula that attempts a calculation on a field that contains characters. For information on data conversions and potential limitations, see Table 5-3 on page 156. This type of error can occur when you run a delete query or an update query on a table that you share with other users on a network. Access cannot update records that are in the process of being updated by some other user. You might want to wait and try again later when no one else is using the affected records to be sure that your update or deletion occurs. Even if you re not sharing the data on a network, you can encounter this error if you have a form or another query open on the data you re updating and have started to change some of the data. If any of the rows being inserted or any row being updated violates either a field validation rule or the table validation rule, Access notifies you of an error and does not insert or update any of the rows that fail the validation test.
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Validation rule violations
Part 1: Part Title
Modifying Data with Action Queries When you have a referential integrity rule defined, you cannot update or delete a row in a way that would violate the rule. Another problem that can occur, although it isn t an error, is that Access truncates data that is being appended to text or memo fields if the data does not fit. Access does not warn you when this happens. You must be sure (especially with append queries) that the receiving text and memo fields have been defined large enough to store the incoming data.
Looking at an Error Example
Earlier in this chapter, you learned how to create an append query to copy old contact events to an archive table. What do you suppose would happen if you copied rows through December 31, 2002, forgot to delete them from the main table, and then later asked to copy rows through April 30, 2003 If you try this starting with an empty archive table in the ContactsDataCopy.mdb database, run qxmplArchiveContactEvents once and then run it again with the same or later cut-off month, you ll get an error dialog box similar to the one shown in Figure 9-30.
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