Endast framåtmarkörer tillåter inte rullning bakåt. Det enda rullningsalternativet vi har är HÄMTA NÄSTA.
Endast framåt statiska markörer är känsliga för alla ändringar (uppdatering, radering, infoga) som görs i den ursprungliga datakällan. Om ändringarna görs kommer de att extraheras på Next Fetch.
Script for Forward_Only Dynamic Cursor
--drop table dbo.Customer Create table dbo.Customer ( CustomerId Int Identity(1,1), CustomerName VARCHAR(100), StreetAddress VARCHAr(100), City VARCHAR(100), State CHAR(2)) go --Insert couple of Records in Sample Table Insert into dbo.Customer Select 'Aamir shahzad','Test Street Address','Charlotte','NC' Union Select 'M Raza','Test Street Address','Charlotte','NC' Select * from dbo.Customer --Insert NEW Record Insert into dbo.Customer Select 'John Smith','Test Street Address','New York City','NY' --Delete Records Delete from dbo.Customer Where CustomerName in ('Aamir Shahzad','M Raza') --Update All Record Update dbo.Customer set CustomerName='NO NAME' --Cursor Script Declare @CustomerID INT Declare @CustomerNAme VARCHAR (100) DECLARE @StreetAddress VARCHAR(100) DECLARE @City VARCHAR(100) DECLARE @State CHAR(2) --DECLARE A CURSOR DECLARE CUR CURSOR Forward_Only Dynamic FOR Select CustomerID,CustomerName,StreetAddress,City,State from dbo.Customer --OPEN CURSOR OPEN CUR Print 'CURSOR IS OPEN' --FETCH NEXT RECORD FETCH NEXT FROM CUR INTO @CustomerID,@CustomerNAme,@StreetAddress,@City,@State WHILE @@FETCH_STATUS=0 BEGIN RAISERROR ('',0,1) WITH NOWAIT WAITFOR DELAY '00:00:15' PRINT CONCAT(@CustomerID,' ',@CustomerNAme,' ',@StreetAddress,' ',@City,' ',@State) FETCH NEXT FROM CUR INTO @CustomerID,@CustomerNAme,@StreetAddress,@City,@State END CLOSE CUR DEALLOCATE CUR
Titta på videon för Forward Only Dynamic Cursor-detaljer i SQL Server