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IsValidKeyDatatype Method

この機能は、将来のバージョンの Microsoft SQL Server では削除される予定です。新しい開発作業では、この機能の使用を避け、現在この機能を使用しているアプリケーションは修正するようにしてください。

The IsValidKeyDatatypemethod returns TRUE when the data type specified can participate in a PRIMARY KEY or FOREIGN KEY constraint.

構文

object.IsValidKeyDatatype(Type , [ ReferencingType ] )

Parts

  • object
    Expression that evaluates to an object in the Applies To list.

  • Type
    String that identifies a single base or user-defined data type by name.

  • ReferencingType
    Optional. A string that identifies a second base or user-defined data type by name.

Prototype (C/C++)

HRESULT IsValidKeyDatatype(
SQLDMO_LPCSTR szKeyColType,
LPBOOL pRetVal,
SQLDMO_LPCSTR szReferencingColType = NULL);

Returns

TRUE or FALSE as described in Remarks.

説明

When only the Type argument is used, the IsValidKeyDatatype method returns TRUE when a column defined using the data type can participate in a PRIMARY KEY constraint.

When a second data type is specified in the ReferencingType argument, the IsValidKeyDatatype method returns TRUE when the types are compatible. A TRUE return value indicates that a column defined using one data type could reference a column defined using the other data type in a FOREIGN KEY constraint.

Applies To:

Database Object