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ITableDefinitionWithConstraints::DropConstraint

  • Artikel

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.

See Also

Reference

ITableDefinitionWithConstraints::AddConstraint