By Jason T. Roff

ISBN-10: 1565924150

ISBN-13: 9781565924154

This ebook is a one-stop advisor to ADO, the common information entry resolution from Microsoft that enables easy accessibility to facts from a number of codecs and systems. It comprises chapters at the Connection, Recordset, box, and Command items and the homes assortment; ADO structure, facts shaping, and the ADO occasion version; short introductions to RDS, ADO.NET, and SQL; and a entire alphabetic connection with each ADO item, strategy, estate, and occasion.

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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. MDB; DriverId=25;FIL=MS Access;MaxBufferSize=2048;PageTimeout=5;" IT-SC book 61 By reading the ConnectionString property, you can determine what settings are being used when connecting to a data source. For instance, in the previous example, you could parse the String for MaxBufferSize and see that it was set to 2048.

A Connection object represents a unique physical connection to a data source. [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.

Example 41 relies on no other code to first establish a connection; the simple connection string DSN=BiblioDSN tells ADO that the table, Titles, is in the BiblioDSN data source. Some objects in ADO -- in particular, the Recordset and the Command objects -- do not require a pre-existing Connection object to operate. Both objects can read and write data 56 IT-SC book to a data source, and both need a physical connection to a data source to do so. But the Recordset and the Command objects can create their own Connection objects in the background with information that you supply.

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ADO ActiveX data objects by Jason T. Roff

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