Key Definition Meta-data
The Key meta-data contains attributes for defining a key for a class. A key defines the unique identification for a class. Use the Key meta-data to manually specify a single key or to create a multi-part key.
In order to create a key, the Class definition must already be created. The ClassDefName attribute creates the actual link to the encompassing class; thus the class name in the ClassDefName attribute must match the ClassDefName attribute for the wanted class.
Instead of using the Key and Key Member meta-data, a single key may be set through the IsPrimaryKey attribute of the Member meta-data. Multi-valued keys must always be defined using the Key and Key Member meta-data.
For information about creating a new class key, see Creating a New Class Key.
The following table shows the attributes used for the class key definitions. A set of these attributes is stored in the ClsKeyDef table for each class key defined.
| Attribute | Data Type | Constraint | Requirement | Description |
| ClassKeyDefID | int | NOT NULL | Leave blank | Stores the unique identifier for the key. |
| CatalogID | int | NULL | Leave blank | Stores the identifier for the Commerce Server 2000 schema catalog. |
| CatalogName | nvarchar (128) | NULL | Leave blank | Stores the name of the schema catalog. For this release of Commerce Server, the catalog name is "DWSchema." |
| ClassDefName | nvarchar (128) | NULL | Required | Stores the name of the class associated with the key. |
| ClassID | int | NULL | Leave blank | Stores the identifier of the class associated with the key. |
| ClassKeyDefName | nvarchar (128) | NULL | Required | Stores the name of the class key. |
| CreatedTime | datetime | NULL | Leave blank | Records when the key was created. |
| Description | nvarchar (128) | NULL | Optional | Stores the description for the key potentially displayed on the UI. |
| DisplayName | nvarchar (128) | NULL | Optional | Stores the name potentially displayed on the UI for the key. |
| IsPrimaryKey | tinyint | NULL | Optional | Indicates if this is the primary key. Defaults to False (0). |
| MajorVersion | int | NULL | Optional | Stores the major version number for the key. |
| MinorVersion | int | NULL | Optional | Stores the minor version number for the key. |
| ModifiedTime | datetime | NULL | Leave blank | Records when the key was last modified. |
| Status | int | NULL | Leave blank | Reserved. |