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Cursors and Locks VB.NET

Posted By:Athira Sreejith       Posted Date: December 31, 2008    Points: 20    Category: ASP.NET    URL: http://www.dotnetspark.com  
 

Cursors and Locks in VB:

Cursors:


They are 4 categories.

1. Forward only:
Fastest,can move only forward in recordset.

2.Static: Can move to any record in the recodset. datas are static and never changes.

3.Keyset: Changes are detectadble. Records that are deleted by other users are unavailable and records created by other users are not detectable.

4. Dynamic: All changes are visible.

Lockes:

They are 3 types of locks.

1. Pessimistic: Locks the rows once after any edit called.

2. Optimistic: Lockes the rows only when update is called.

3. Batch Optimistic: Allows batch updation.

4. Read only: Read only Cannot alter the data.

 

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