Jaa

Keys Collection

  • Artikkeli

This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature.

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

SQL-DMO object model that shows the current object

Properties

Count Property

 

Methods

Add Method

Refresh Method

Item Method

Remove Method (Collections)

Remarks

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)

Note

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.