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Chapter 27. Understanding Universal Data... > Exploring Top-Level ADO Properties, ...

Exploring Top-Level ADO Properties, Methods, and Events

At this point in your ADO learning curve, a detailed list of properties, enumerations of constant values, methods, and events of ADO components might appear premature. Understanding the capabilities and benefits of ADO, however, requires familiarity with ADO's repertoire of properties, methods, and events. To get the most out of ADP, which doesn't support Jet 4.0 and DAO 3.6, and to program Data Access pages (DAP) you must have a working knowledge of ADO programming techniques.

DAO objects don't fire events; ADO objects do. Visual Basic 4.0 and RDO 1.0 added an event model for RDO's rdoEnvironment, rdoConnection, and rdoResultset objects. Visual Basic 5.0's RDO 2.0 increased the granularity of the data-related events, providing developers with much finer control over communication with SQL Server and other client/server RDBMSs. Access objects offer fine-grained events, but don't provide programmers with a lower-level event model for basic operations, such as connecting to the database and executing queries. Access 97's ODBCDirect offered an event model, but you couldn't bind ODBCDirect Recordsets to forms. ADO offers a complete event model, which is quite similar to that of RDO 2.0.


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