Is RollBack Necessary?

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Hi,

Is Rollback Necessary, when there is an error in Insert Query?

Posted 30-Jun-14 19:27pm

kgmmurugesh

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Thanks7872 · Answer 1 · 2014-06-30T19:31:00

Solution 1

How about reading this one : SQL Server Transactions and Error Handling[^]

Posted 30-Jun-14 19:31pm

Thanks7872

Comments

kgmmurugesh 1-Jul-14 2:16am

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim sqlcmd As New SqlClient.SqlCommand

Dim con As New SqlClient.SqlConnection("Data Source=kgmmurugesh\sqlexpress;Initial Catalog=KGMERP_STORES;Integrated Security=True")

Try
con.Open()
sqlcmd.Connection = con
sqlcmd.CommandText = "begin tran ItemCreation"
sqlcmd.ExecuteNonQuery()

sqlcmd.CommandText = "Insert into Item_table(Item_Name,Item_PRate) values ('apple','a150')"
sqlcmd.ExecuteNonQuery()

sqlcmd.CommandText = "commit tran ItemCreation"
sqlcmd.ExecuteNonQuery()

Catch ex As Exception

sqlcmd.CommandText = "rollback tran ItemCreation"
sqlcmd.ExecuteNonQuery()

End Try

End Sub

This is my code, when there is a error in Insert command, it shows
The ROLLBACK TRANSACTION request has no corresponding BEGIN TRANSACTION.

Sergey Alexandrovich Kryukov · Answer 2 · 2014-06-30T19:34:00

The concept of rollback is an important part of the transaction concept, as well as atomicity. Please understand this:
http://en.wikipedia.org/wiki/Transaction_processing[^],
http://en.wikipedia.org/wiki/Database_transaction[^],
http://en.wikipedia.org/wiki/Atomic_transaction[^].

Do you need a rollback on error? Look at this from the atomicity point of view. If you insert updated just one record and the whole insert statement is incomplete, will your operation preserve integrity of the database? That's why you may need the rollback.

—SA