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ADO Parameter Object Remarks

The Properties collection is not currently supported on UNIX.

Many providers support parameterized commands. These are commands where the desired action is defined once, but variables (or parameters) are used to alter some details of the command. For example, an SQL SELECT statement could use a parameter to define the matching criteria of a WHERE clause, and another to define the column name for a SORT BY clause.

The Parameter objects represent parameters associated with parameterized queries, or the in/out arguments and the return values of stored procedures. Depending on the functionality of the provider, some collections, methods, or properties of a Parameter object may not be available.

The collections, methods, and properties of a Parameter object are used to:

If you know the names and properties of the parameters associated with the stored procedure or parameterized query you wish to call, you can use the CreateParameter method to create Parameter objects with the appropriate property settings and use the ADO Collections Append Method to add them to the ADO Parameters Collection. This lets you set and return parameter values without having to call the ADO Collections Refresh Method on the Parameters collection to retrieve the parameter information from the provider, a potentially resource-intensive operation.