Question

Saving new record to dataset and then comitting changes to database

Asked by: Mike_Stevens

I am trying to save a newly inserted row in the dataset and commit the changes back to the database in a vb.net windows project.    I am creating the dataset when the form loads and then adding a row to that dataset when i execute the save code i created.  Below is how i am creating the dataset:

Public Class frmMainForm

    Dim BOL_DS As New DataSet  <-----declaring the dataset

    Private Sub frmMainForm_Load..........        
         Dim sSQL As String = "SELECT * FROM tblInfo"
         Dim cn As New SqlConnection(My.Settings.dbConnectionString)
         Dim da As New SqlDataAdapter(cn.CreateCommand)

         If cn.State = ConnectionState.Closed Then
             cn.Open()
         End If

         da.SelectCommand.CommandText = sSQL
         da.Fill(BOL_DS)
   End Sub

Then when i want to save the data to the dataset i am doing the following:

         Dim dr As DataRow
        dr = BOL_DS.Tables(0).NewRow

        dr("Rec_ID") = Me.Rec_ID.Text
        dr("Date") = Me.Todays_Date.Text

        BOL_DS.Tables(0).Rows.Add(dr)

I then commit the changes to the database as follows:

        Dim sSQL As String = "SELECT * FROM tblInfo"

        Dim cn As New SqlConnection(My.Settings.dbConnectionString)
        Dim da As New SqlDataAdapter(sSQL, cn)

        Dim cb As New SqlCommandBuilder(da)

        'update dataset
        da.Update(BOL_DS)

When I execute all of this code it all seems to work (no errors are thrown) but nothing gets saved back to the database.   I am hoping somebody can shed some light on what is happening and what i am doing wrong.   I am using vb.net & SQL server 2005.

Thanks

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Asked On
2007-06-27 at 07:06:09ID22661197
Tags

changes

,

database

,

record

,

2005

,

dataset

Topics

.NET

,

Microsoft Visual Basic.Net

,

Visual Studio

Participating Experts
1
Points
500
Comments
5

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Answers

 

by: soteaPosted on 2007-06-27 at 07:18:47ID: 19372451

I then commit the changes to the database as follows:
        Dim sSQL As String = "SELECT * FROM tblInfo"

is that a copy/paste error, or do you have a SELECT sSQL, instead of an UPDATE?

 

by: Mike_StevensPosted on 2007-06-27 at 07:27:51ID: 19372543

No...i have "SELECT". I am following an example on a book from Microsoft and the example shows "select".   I tried update and I get "error near *" error message.

 

by: soteaPosted on 2007-06-27 at 08:17:47ID: 19373074

ok, here is what I did when I had to Update/Insert something into my DB:
        Dim objCmd As New OleDbCommand
        Dim updateSQL As String

        con.Open()

        updateSQL = "UPDATE YourDB SET...

        objCmd = New OleDbCommand(updateSQL, con)
        objCmd.ExecuteNonQuery()
        con.Close()

 

by: Mike_StevensPosted on 2007-06-27 at 08:39:08ID: 19373316

I have done the same process myself in the past.   Following this process all of the table columns my be defined in the SQL statement right?

20120131-EE-VQP-002

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