Download e-book for iPad: ADO ActiveX data objects by Jason T. Roff

By Jason T. Roff

ISBN-10: 1565924150

ISBN-13: 9781565924154

This e-book is a one-stop advisor to ADO, the common info entry answer from Microsoft that enables easy accessibility to information from a number of codecs and structures. It contains chapters at the Connection, Recordset, box, and Command items and the houses assortment; ADO structure, info shaping, and the ADO occasion version; short introductions to RDS, ADO.NET, and SQL; and a finished alphabetic connection with each ADO item, process, estate, and occasion.

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Additional resources for ADO ActiveX data objects

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1] [1] For a complete list of the Connection object's methods, see Chapter 13. 1 Opening and Closing a Connection: Implicit Versus Explicit The Connection object is used to establish a unique physical connection to a given data source. This connection defines how you can obtain, interact with, and manipulate data from the specified source. While a Connection object is always required, you can choose whether to instantiate a connection explicitly or to allow ADO to create one implicitly on your behalf.

Either way works, and there is no real benefit to using one method over another. The ConnectionString property of the Connection object has another useful function, however. Because it has read ability as well as write ability, we can use the ConnectionString property to view the ConnectionString used by a Connection object that was implicitly created with another object, such as a Recordset object, as shown in Example 4-4. Example 4-4. Close Set con = Nothing After running the previous code, the ConnectionString property of the implicitly created Connection object is printed to the Immediate window of the VB IDE.

For instance, in the previous example, you could parse the String for MaxBufferSize and see that it was set to 2048. 2 Working with Data Source Names Another way in which to use the Open method of the Connection object is for the ConnectionString to be set to a valid Data Source Name (DSN). Valid DSNs are maintained in the ODBC applet in the Windows Control Panel. This is where all of the information regarding connections is stored. Using a DSN allows you to not worry about the actual definition of the connection string in your application.

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ADO ActiveX data objects by Jason T. Roff


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