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New Message on BDOTNET
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From: Jigs
Message 1 in Discussion
Easy to use VS performance: At one end where dataadaptor is quite easy to use,
where as datareader for better performance.
RowCount: Often after we fire select query , we would like to know how many
recrods we retrieved. With a DataReader its not possible to know rowcount
unless we finish iteration through all rows. you will need to use another
SELECT COUNT(*) query. the quick solution can be as below
Dim dr As SqlDataReader
Dim cmd As New SqlCommand("Select Count(*) from Jokes;Select * from Jokes",
Me.SqlConnection1)
Dim TotalRows As Integer
Me.SqlConnection1.Open()
dr = cmd.ExecuteReader()
While dr.Read()
TotalRows = dr(0)
MsgBox(TotalRows.ToString())
dr.NextResult()
While dr.Read()
MsgBox(dr("JokeHeading"))
End While
End While
Me.SqlConnection1.Close()
With dataadaptor its easy, since data is stored in DataSet we get rowcount also
we can iterate to next and previous records , which is not possible using
datareader
Passing Data between layers: one major limitation is you can't serialized
datareaders, only alternative is DataSets.
Regards
Jignesh Desai
http://dotnetjini.jigneshdesai.com
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