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Retrieving Sql Data And Storing In Session Variables

Posted on 2014-03-27
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Last Modified: 2014-04-01
Hi

I'm trying/want to store the results of a sql query in session variables, how do I do this?

My code so far works and returns results to a gridview..

        If True Then
            'Establishing the MySQL Connection
            Dim strConnString As String = ConfigurationManager.ConnectionStrings("ZUConnectionString").ConnectionString

            Dim sqlConnection1 As New SqlConnection(strConnString)

            Dim query As String
            Dim SqlCommand As SqlCommand
            Dim reader As SqlDataReader

            Dim adapter As New SqlDataAdapter()
            'Open the connection to db
            sqlConnection1.Open()

            'Generating the query to fetch the contact details
            query = "SELECT * FROM All"

            SqlCommand = New SqlCommand(query, sqlConnection1)
            adapter.SelectCommand = New SqlCommand(query, sqlConnection1)
            'execute the query
            reader = SqlCommand.ExecuteReader()
            'Assign the results 
            GridView1.DataSource = reader

            'Bind the data
            GridView1.DataBind()

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I'd like to store each returned field as  

  Session("xxxxxx") =



Thanks
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Question by:Ed
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4 Comments
 
LVL 52

Expert Comment

by:Carl Tawn
ID: 39960098
It would be simpler to load the data into a DataTable and store that - plus you can't use a DataReader in this context because it is read-forward only so you can't bind to it and then read it again manually:
        If True Then
            'Establishing the MySQL Connection
            Dim strConnString As String = ConfigurationManager.ConnectionStrings("ZUConnectionString").ConnectionString

            Dim sqlConnection1 As New SqlConnection(strConnString)
            Dim query As String

            Dim adapter As New SqlDataAdapter()
            Dim table As New DataTable()

            'Generating the query to fetch the contact details
            query = "SELECT * FROM All"

            adapter.SelectCommand = New SqlCommand(query, sqlConnection1)
            adapter.Fill(table)

            'Assign the results 
            GridView1.DataSource = table

           '// Store in session
           Session("Table") = table

            'Bind the data
            GridView1.DataBind()

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The bigger question, of course, is why do you want to store it in a Session variable? Holding large amounts of data in user specific context is usually a bad idea.
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Accepted Solution

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Ed earned 0 total points
ID: 39960352
Thanks for you help.

It can be done though and I've managed to get it working now.

See the code below. It works on a selected gridview row.

Protected Sub GridView1_SelectedIndexChanged(sender As Object, e As System.EventArgs) Handles GridView1.SelectedIndexChanged
        Dim row As GridViewRow = GridView1.SelectedRow

        Dim Val = row.Cells(0).Text





        Dim strConn As String = System.Configuration.ConfigurationManager.ConnectionStrings("QuoteConnectionString").ToString()
        Dim sql As String = "SELECT * FROM AllQuotes where QuoteID =@QuoteID"
        Dim conn As New Data.SqlClient.SqlConnection(strConn)
        Dim objDR As Data.SqlClient.SqlDataReader
        Dim Cmd As New Data.SqlClient.SqlCommand(sql, conn)

        Cmd.Parameters.AddWithValue("@username", row.Cells(0).Text)

        conn.Open()
        objDR = Cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection)
        While objDR.Read()
    


            Session("LoanAmount") = objDR("LoanAmount")
            Session("LoanTerm") = objDR("LoanTerm")
     


        End While

        Response.Redirect("xxxxxxx.aspx")
    End Sub

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LVL 52

Expert Comment

by:Carl Tawn
ID: 39960359
That isn't quite what you asked for in your question....but at least you're sorted.
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Author Closing Comment

by:Ed
ID: 39968815
Worked it out myself
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