Identity Property
Dieses Feature wird in einer zukünftigen Version von Microsoft SQL Server entfernt. Verwenden Sie dieses Feature beim Entwickeln neuer Anwendungen nicht, und planen Sie das Ändern von Anwendungen, in denen es zurzeit verwendet wird.
The Identity property exposes the Microsoft SQL Server row identity property of a column.
Syntax
object
.Identity [=value]
Parts
- object
An expression that evaluates to an object in the Applies To list
- value
TRUE or FALSE
Data Type
Boolean
Modifiable
Read/write prior to SQL Server column creation. Read-only for existing columns.
Prototype (C/C++)
HRESULT GetIdentity(LPBOOL pRetVal);
HRESULT SetIdentity(BOOL NewValue);
Hinweise
SQL Server allows the row identity property on a single column within a table. Identity, like a primary key, identifies a row uniquely. SQL Server implements row identification using a numeric value. As rows are inserted, SQL Server generates the row value for an identity column by adding an increment to the existing maximum value.
A SQL Server column with identity must have a numeric data type that can be represented as an integer. For example, columns with the SQL Server data types int and decimal(4, 0) can have identity assigned.
If TRUE, this is, or will be, the single identity column for this table.
If FALSE, this column does not have the row identity property.