How do u implement locking concept for dataset?
Answers were Sorted based on User's Feedback
Answer / ananthi.r
When we update , the DataSet helps out with the process,
because it keeps track of multiple versions of rows that
have been updated. You can use parameters to set the
CommandText property of DataAdapter's UpdateCommand. The
SqlParameter class contains a property, called RowVersion,
that informs the DataSet which version of the value to make
use of. The DataAdapter judges whether the update worked by
considering whether the UPDATE statement have an effect on
zero or a non-zero number of rows. If someone else has
changed design (or deleted the row), the UPDATE returns "0
rows affected." If no one else touched the row (that is,
your optimism was justified), you receive "1 row affected."
Is This Answer Correct ? | 5 Yes | 2 No |
Answer / akash
One way to work around optimistic concurrency issues in ADO
is to lock the records your DataSet retrieves as soon as
the edit operation begins. This strategy is known as
pessimistic locking. Long-duration locks generally lead to
poor database performance and contention problems, but in
situations where an application cannot tolerate having
records changed while it is updating them, pessimistic
locking may be necessary.
With ADO, it's relatively easy to use a pessimistic locking
scheme. In ADO.NET, it's somewhat more difficult to set up,
but you can still use pessimistic locking in your
applications. However, just because you can do something
doesn’t mean you should do it all the time—what I’m about
to explain should be used only when absolutely necessary.
The basics steps for pessimistic locking are as follows:
1)Create a transaction with an IsolationLevel of
RepeatableRead.
2)Set the DataAdapter’s SelectCommand property to use the
transaction you created.
3)Make the changes to the data.
4)Set DataAdapter’s Insert, Update, and Delete command
properties to use the transaction you created.
5)Call the DataAdapter’s Update method.
6)Commit the transaction.
Is This Answer Correct ? | 3 Yes | 0 No |
What connected data?
how you will deal result set? How do you sort a dataset?If a dataset contains 100 rows, how to fetch rows between 5 and 15 only?
How to get the new oledb connection of oracle in database programming?
What are two important objects of ADO.Net?
How can you identify whether or not any changes are made to the DataSet object since it was last loaded?
What are the advantages and drawbacks of using ado.net?
what is trigger?
8 Answers Microsoft, Precept Technology,
If a table contains 20000 records . In a page at each time 100 records to be displayed. What are the steps u will take to improve performance? will you use dataset or datareader?
Why do we serialize data?
If we are not returning any records from the database, which method is to be used?
What is the main difference between ADO and ADO.Net
What are the parameters that control most of connection pooling behaviours?