Dynamic Cursors are update-able. The dynamic cursor will fetch the changes (insert,update or delete) on each fetch while cursor is open if any modification happened to original data in table/s. This type of Cursor is helpful when we want to extract the records from original table/s while cursor is open and we are still in process of modification of data or inserting new records and want to include them in cursor result set to perform operation.
Dynamic cursors are scrollable (First,Last,Prior,Next,Relative) but absolute option does not work with dynamic Cursors.
Script for Dynamic Cursor in SQL Server used in the video as well.
--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 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