ITableDefinitionWithConstraints::DropConstraint

OLE DB Programmer's Reference

Drops a constraint from a base table.

HRESULT DropConstraint(    DBID   *pTableID,    DBID   *pConstraintID);

Parameters

pTableID: [in]
A pointer to the DBID of the table from which to drop the constraint.
pConstraintID: [in]
A pointer to the DBID of the constraint to drop.

Return Code

S_OK: The method succeeded, and the constraint was dropped from the base table.
E_FAIL: A provider-specific error occurred.
E_INVALIDARG: pTableID or pConstraintID was a null pointer.
DB_E_BADTABLEID: The constraint specified in *pConstraintID does not exist in the table specified in *pTableID.
DB_E_DROPRESTRICTED: The provider could not drop the constraint because there were one or more table constraints dependent on pConstraintID.
DB_E_NOCONSTRAINT: pConstraintID did not exist in the data store.
DB_E_NOTABLE: The specified table does not exist in the data store.
DB_E_TABLEINUSE: The specified table was in use, and the provider could not drop the constraint as a result.
DB_SEC_E_PERMISSIONDENIED: The consumer did not have sufficient permission to drop the constraint.
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 ITableDefinitionWithConstraints::DropConstraint returns any errors, the constraint 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