By David Sussman
All programmers operating in database expertise utilizing Microsoft improvement instruments will locate this e-book helpful. As a reference, it's compatible for novices and skilled programmers alike. this can be a welcome addition and supplement to the other ADO handbook, and its one you should stick with it the table in any respect times.
This informative consultant presents an entire connection with the ADO API, overlaying all models as much as 2.8. Code samples are concise, and emphasis is put on ADO innovations instead of the categorical environments within which it can be used. the various book's highlights include:
- Coverage of comparable applied sciences, reminiscent of ADOX and ADOMD
- Online samples in a number of languages
- Examination of ADO functionality features
This is the main definitive booklet at the topic thus far, and has been the best reference on ADO due to the fact its first release.
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All programmers operating in database know-how utilizing Microsoft improvement instruments will locate this ebook priceless. As a reference, it really is compatible for newcomers and skilled programmers alike. this can be a welcome addition and supplement to the other ADO handbook, and its one you have to carry on the table normally.
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Extra resources for ADO Programmer’s Reference
First, you can ask the data provider to fetch the parameters from the data source, and the Parameters collection will be filled in automatically for you: objCmd . Refresh The downside of this is that it requires a trip to the server, which may cause your program to perform poorly, especially if you do this often. However, it's a great way of finding out what type and size the provider expects your parameters to be, and is very useful during development and debugging. You should note that not all OLE DB Providers (or ODBC Drivers) support the Refresh method.
Complete event pairs. 45 Chapter 2 A will ... event is called just before the action starts. It gives you the chance to examine the details of the action, and to cancel the action if you decide not to run it. The ... Complete event is called just after the action completes, even if the operation was cancelled. If it was cancelled, the Errors collection is filled with details of why it was cancelled. The will. events generally have an argument, adStatus, indicating the status of the event. You can set this argument to adStatusCancel before the method ends, to cancel the action that caused the event.
From the Provider tab in the Data Link Properties window, you can see the available providers, as shown here: In fact, using the Data Link is a good way to create connection strings if you are unfamiliar with them; you can even use them instead of a DSN within connection strings (see the next section). You can create a Data Link file, filling in the details onscreen, and then examine the resulting . udl file in Notepad. 40 The ADO Object Model Connection Strings One of the major differences among the various OLE DB providers is found in the connection string: Different providers require different information to be able to make the connection to the data store.
ADO Programmer’s Reference by David Sussman