Parameters Collection
A Parameters collection contains all the Parameter objects of a Command
object.
Properties
Count, Item
Methods
Append, Delete, Refresh
Remarks
A Command object has a Parameters collection made up of Parameter
objects.
Using the Refresh method on a Command
object's Parameters collection retrieves provider parameter
information for the stored procedure or parameterized query specified in the Command
object. The collection will be empty for providers that do not support stored
procedure calls or parameterized queries.
If you have not defined your own Parameter objects and you access the Parameters
collection before calling the Refresh method, ADO will automatically
call the method and populate the collection for you.
You can minimize calls to the provider to improve performance if you know the
names and properties of the parameters associated with the stored procedure or
parameterized query you wish to call. Use the CreateParameter
method to create Parameter objects with the appropriate property
settings and use the Append method to add them to
the Parameters collection. This lets you set and return parameter
values without having to call the provider for the parameter information. If
you are writing to a provider that does not supply parameter information, you
must manually populate the Parameters collection using this method to
be able to use parameters at all. Use the Delete
method to remove Parameter objects from the Parameters
collection if necessary.
To refer to a Parameter object in a collection by its ordinal number or
by its Name property setting, use any of the
following syntax forms:
command.Parameters.Item(0)
command.Parameters.Item("name")
command.Parameters(0)
command.Parameters("name")
command(0)
command("name")
command![name]
Applies To
Command
See Also
CreateParameter, Parameter
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