Supported Command Object Interfaces

The Command object is supported with the Advantage OLE DB Provider. Below is the list of supported interfaces in the Command object. Generally, for each interface listed, all the methods will be supported.

Command Object

IAccessor	IColumnsInfo	ICommand	ICommandProperties
ICommandText	IConvertType	ICommandPrepare	ICommandWithParameters
ISupportErrorInfo

Implementation Details by Method

The Advantage OLE DB Provider supports IAccessor interface member functions as described in the following table.

Member Function	Description
AddRefAccessor	Adds a reference count to an existing accessor.
CreateAccessor	Creates an accessor from a set of bindings. Optimized and ByRef accessors are not supported by the Advantage OLE DB Provider.
GetBindings	Returns the bindings in an accessor.
ReleaseAccessor	Releases an accessor.

The Advantage OLE DB Provider supports IColumnsInfo interface member functions as described in the following table.

Member Function	Description
GetColumnInfo	Returns the column metadata needed by most consumers.
MapColumnIDs	Returns an array of ordinals of the columns in a rowset that are identified by the specified column IDs.

The Advantage OLE DB Provider supports ICommand interface member functions as described in the following table.

Member Function	Description
Cancel	Cancels the current command execution. With the Advantage OLE DB Provider, canceling a synchronous command is supported if it is canceled from another thread. Canceling an asynchronous command is not supported because asynchronous commands are not supported.
Execute	Executes the command.
GetDBSession	Returns an interface pointer to the session that created the command.

The Advantage OLE DB Provider supports ICommandProperties interface member functions as described in the following table.

Member Function	Description
GetProperties	Returns the list of properties in the Rowset property group that are currently requested for the rowset.
SetProperties	Sets properties in the Rowset property group.

The Advantage OLE DB Provider supports ICommandText interface member functions as described in the following table.

Member Function	Description
GetCommandText	Returns the text command set by the last call to SetCommandText.
SetCommandText	Sets the command text, replacing the existing command text.

The Advantage OLE DB Provider supports IConvertType interface member functions as described in the following table.

Member Function	Description
CanConvert	Gives information about the availability of type conversions on a command or on a rowset.

The Advantage OLE DB Provider supports ICommandPrepare interface member functions as described in the following table.

Member Function	Description
Prepare	Validates and optimizes the current command.
Unprepare	Discards the current command execution plan.

The Advantage OLE DB Provider supports ICommandWithParameters interface member functions as described in the following table.

Member Function	Description
GetParameterInfo	Gets a list of the command’s parameters, their names, and their types.
MapParameterNames	Returns an array of parameter ordinals when given named parameters.
SetParameterInfo	Specifies the native data type of each parameter.

The Advantage OLE DB Provider supports ISupportErrorInfo interface member functions as described in the following table.

Member Function	Description
InterfaceSupportsErrorInfo	Indicates whether a specific OLE DB interface can return OLE DB error objects.