The ADO Parameter object provides information about a single parameter used in a stored procedure or query.
A Parameter object is added to the Parameters Collection when it is created. The Parameters Collection is associated with a specific Command object, which uses the Collection to pass parameters in and out of stored procedures and queries.
Parameters can be used to create Parameterized Commands. These commands are (after they have been defined and stored) using parameters to alter some details of the command before it is executed. For example, an SQL SELECT statement could use a parameter to define the criteria of a WHERE clause.
There are four types of parameters: input parameters, output parameters, input/output parameters and return parameters.
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