MDAC 2.5 SDK - OLE DB Programmer's Reference
OLE DB Interfaces

ITableDefinition::DropColumn

Drops a column from the base table.

HRESULT DropColumn(
   DBID* pTableID,
   DBID* pColumnID);

Parameters

pTableID

[in]
A pointer to the DBID of the table from which to drop the column.

pColumnID

[in]
A pointer to the DBID of the column to drop.

Return Code

S_OK

The method succeeded, and the column was dropped from the base table.

E_FAIL

A provider-specific error occurred.

E_INVALIDARG

pTableID or pColumnID was a null pointer.

DB_E_BADCOLUMNID

The column specified in *pColumnID does not exist in the specified table.

DB_E_DROPRESTRICTED

The provider could not drop the column because pColumnID was referenced in a view definition.

The provider could not drop the column because pColumnID was referenced in a constraint belonging to a table other than pTableID.

The provider could not drop the column because pColumnID was referenced, along with one or more other columns, in a constraint definition on pTableID.

DB_E_NOTABLE

The specified table does not exist in the current data store.

DB_E_TABLEINUSE

The specified table was in use.

DB_SEC_E_PERMISSIONDENIED

The consumer did not have sufficient permission to drop the column.

XACT_E_XTIONEXISTS

The provider supports transactional DDL, the session is participating in a transaction, and the value of DBPROP_SUPPORTEDTXNDDL is DBPROPVAL_TC_DML.

Comments

If ITableDefinition::DropColumn returns any errors, the column is not dropped.

If the session is participating in a transaction, if DBPROP_SUPPORTEDTXNDDL is DBPROPVAL_TC_DDL_IGNORE, and if the method succeeds, the operation is complete and is unaffected by subsequent calls to abort or commit the transaction.

If the session is participating in a transaction, if DBPROP_SUPPORTEDTXNDDL is DBPROPVAL_TC_DDL_COMMIT, and if the method succeeds, the transaction is committed without retention. No new transaction is created. Any new work done on the session is outside the scope of a transaction. Attempting to explicitly commit or abort when there is no outstanding transaction returns an error.

See Also

ITableDefinition::AddColumn