IdentitySeed Property
Questa caratteristica verrà rimossa a partire da una delle prossime versioni di Microsoft SQL Server. Evitare di utilizzare questa funzionalità in un nuovo progetto di sviluppo e prevedere interventi di modifica nelle applicazioni in cui è attualmente implementata.
The IdentitySeed property exposes the initial row value for an identity column.
Sintassi
object.IdentitySeed [=value]
Parts
object
An expression that evaluates to an object in the Applies To listvalue
A long integer greater than or equal to 1
Data Type
Long
Modifiable
Read/write prior to Microsoft SQL Server column creation. Read-only for existing columns.
Prototype (C/C++)
HRESULT GetIdentitySeed(LPLONG pRetVal);
HRESULT SetIdentitySeed(LONG NewValue);
Osservazioni
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.
For example, the identity values for the first three rows inserted into a table containing a column defined with identity, an identity seed of 1, and an increment value of 3, are 1, 4, and 7.