Keys Collection

后续版本的 Microsoft SQL Server 将删除该功能。请避免在新的开发工作中使用该功能，并着手修改当前还在使用该功能的应用程序。

The Keys collection contains Key objects that reference referential integrity declarations that are implemented by Microsoft SQL Server PRIMARY KEY and FOREIGN KEY constraints.

Properties

Count Property

Methods

Add Method	Refresh Method
Item Method	Remove Method (Collections)

备注

With the Keys collection, you can:

• Implement key-based referential integrity by creating SQL Server PRIMARY KEY and FOREIGN KEY constraints.
• Remove key-based referential integrity.

For more information about using the Keys collection to create SQL Server PRIMARY KEY and FOREIGN KEY constraints, see "Key Object" in this volume.

To remove a SQL Server constraint implementing key-based referential integrity

• Use the Remove method of the Keys collection, as in:

  oTable.Keys.Remove("FK_Order_Details_Products")
  

When using the Item or Remove method, the Keys collection supports member identification using either name or ordinal reference syntax. For example:

Set oKey = oTable.Keys("PK_Order_Details")

Or:

Set oKey = oTable.Keys(2)

注意：
Creating or removing SQL Server constraints implementing key-based referential integrity by using the Keys collection requires appropriate privilege. The SQL Server login used for SQLServer object connection must be a member of the fixed role db_ddladmin or a role with greater privilege.