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MS Access

Posted May 30, 2000

Introduction to Database Manipulation with ADO - Page 2

By Benoy Jose

The ADO Interface

ADO is built upon another layer called the OLE-DB. ODBC is one popular OLE-DB provider. ADO capabilities can vary depending upon the OLE-DB provider. Ado Capabilities can also vary widely depending upon the ODBC driver used. For example most ODBC drivers do not support all the cursor types, (cursor types are discussed later).

Exploring the ADO

The ADO Object model consists of seven objects namely:

The Connection, Command and Recordset objects each have a collection of properties. The Connection object also maintains a collection of Error objects detailing the errors we encounter while making database connections. Each member of this collection is a Field object which in turn contains information about individual fields in the Recordset.
However the Connection, RecordSet and Command objects are the most commonly used objects for interaction with databases. The different objects are used depending on the complexity of the data manipulation.

The Connection object is used to establish a connection to a database and can be used for simple database queries like select, insert, delete, update etc. It can be also used for other complex manipulations like stored procedures, but they are better done by other objects.

The RecordSet object is used for updating records, querying multiple tables and fields. Unlike the Connection object, the RecordSet gives more information on the transaction like the number of records updated, records deleted etc.

The Command object is capable of running stored procedures and SQL statements with multiple and complex parameters. 

The Field object represents an individual field in the RecordSet. It is generally used in conjunction with the RecordSet object for more flexibility in programming.

The Parameter object represents a parameter in a SQL stored procedure.

The Error object represents the ADO errors.

The Property object provides properties of different data providers like MS-Access, SQL Server etc.



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