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Warren
3338
web chart and sql datasource...
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I am using a webchart and a sqldatasource command.

I have a question..

Is it possible for me to, in the code behind, to set the "select command" statement from the server side?

I want to do this so I can have something like..

 

Select * from table where value = textbox.value

THe user gets to the page and gets the initial chart data, then allow them to enter a value in a text box to refresh the chart but change the sql statement to include the value from the textbox they entered.

 

 

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    Verified Answer
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    Hi, as far as I know, it is possible to "refresh" the chart at runtime, I do that by creating a SqlCommand Object, wich can be any SQL statement, and then fill a DataSet with the result of the query, but you have to be careful with the resulting data, here's a example using a StoredProcedure in the server that accepts a parameter:

    -------------------------------------Starts Query------------------------------------

    Dim com As New SqlCommand("Compare2Y")
    com.CommandType = CommandType.StoredProcedure

    com.Parameters.Add("@Y1", SqlDbType.Int)
    com.Parameters("@Y1").Value = 2009

    com.Connection = New SqlConnection(MainConnectionString)
    Dim dr As SqlDataReader
    com.Connection.Open()

    dr = com.ExecuteReader()

    ----------------------------This part is for creating the DS------------------------------------

    ds.Tables.Add("DATOS")
    ds.Tables("DATOS").Columns.Add("Fallecidos", Type.GetType("System.Int32"))
    ds.Tables("DATOS").Columns.Add("Lesionados", Type.GetType("System.Int32"))
    ds.Tables("DATOS").Columns.Add("Accidentes", Type.GetType("System.Int32"))
    ds.Tables("DATOS").Columns.Add("Personales", Type.GetType("System.Int32"))
    ds.Tables("DATOS").Columns.Add("Materiales", Type.GetType("System.Int32"))
    Dim fila As DataRow
    While dr.Read()
                fila = ds.Tables("DATOS").NewRow()
                fila("Fallecidos") = CInt(dr(1))
                fila("Lesionados") = CInt(dr(2))
                fila("Accidentes") = CInt(dr(3))
                fila("Personales") = CInt(dr(4))
                fila("Materiales") = CInt(dr(5))
                ds.Tables("DATOS").Rows.Add(fila)

    End While

    -------------------------------------Ending Query------------------------------------


    dr.Close()
    com.Connection.Close()
     com = Nothing
    dr = Nothing

    -------------------------------------Adding the result into a chart------------------------------------

    Chart1.DataSource = ds
    Chart1.DataMember = "DATOS"
    Chart1.DataBind()

     

    This code can be on a Subroutine that can be called anytime, passing the value asked for the StoredProcedure.

     

    Bye!

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