ITableDefinitionWithConstraints::DropConstraint
Drops a constraint from a base table.
Syntax
HRESULT DropConstraint(
DBID *pTableID,
DBID *pConstraintID);
Remarks
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.