The command object uses the IAccessor interface to specify parameter bindings. The consumer calls IAccessor::CreateAccessor, passing it an array of DBBINDING structures. DBBINDING contains information about the column bindings (such as type and length). The provider receives the structures and determines how the data should be transferred and whether conversions are necessary.

The ICommandText interface provides a way to specify a text command. The ICommandProperties interface handles all the command properties.

OLE DB Provider Template Architecture