Question

New to VB.NET

Asked by: michael5865

Hi,
I am new to VB.NET.
I am building a Web application that should:

Step 1: take in a user-entered "start date", "end date" and a "customer name"
Step 2: on a click, call a stored procedure that builds a table of data drawn from other tables
Step 3: displays the data in a datagrid on the form
Step 4: permits the data to be edited
Step 5: on a click, writes the edited data to a database table

I have laid out the GUI but not done any of the coding.
Am I correct in thinking that I first have to make a connection to the stored procedure?
How is the stored procedure activated so as to fill the datagrid?
I would appreciate it if someone could start me off on this process.
With thanks,
Michael

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Asked On
2003-09-24 at 12:48:40ID20747918
Tags

connection

,

how

Topic

.NET

Participating Experts
1
Points
250
Comments
9

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Answers

 

by: ghornetPosted on 2003-09-24 at 16:49:30ID: 9424892

This should give you a start I just quickly wrote this but it might give you an idea

        Dim Conn As SqlConnection ="DB string connection goes here"
        Dim objSPComm As New SqlCommand("ContactCount", Conn)
        objSPComm.CommandType = CommandType.StoredProcedure

        Dim CC As SqlParameter = New SqlParameter("@StartDate", SqlDbType.DBDate, 50)
        CC.Direction = ParameterDirection.input
        objSPComm.Parameters.Add(CC)

        Dim CC1 As SqlParameter = New SqlParameter("@EndDate", SqlDbType.DBDate, 50)
        CC1.Direction = ParameterDirection.input
        objSPComm.Parameters.Add(CC1)

        Dim CC2 As SqlParameter = New SqlParameter("@Name", SqlDbType.VarChar, 50)
        CC2.Direction = ParameterDirection.input
        objSPComm.Parameters.Add(CC2)

     
        Conn.Open()
        dgYourDG.DataSource = objSPComm.ExecuteReader()
         dgYourDB.Databind()
        Conn.Close()

This won't allow you to edit the data in the DG yet
but once you get the info in the DG it is'nt that hard

good luck

 

by: michael5865Posted on 2003-09-25 at 05:55:27ID: 9427960

Thank you - your coding is very helpful in telling me what I need to do.

In implementing the coding, I notice that the variable types SqlCommand and SqlParameter are not defined. Do I use a Private declaration at the top of the WebForm.aspx page? Could you tell me the syntax for the Private statements?

Also, when I pasted in the "DB string connection" which I got from the connection properties on the form designer, there is a problem with the syntax. The string is as follows:
"Dim Conn As SqlConnection1 = "workstation id="RAY-XP"; packet size=4096;user id=sa;data source=ATLANTIS;persist security info=False;initial catalog=Unison"
The error msg is: "End of statement expexted"

Thanks again for getting me started.

Michael

 

by: ghornetPosted on 2003-09-26 at 08:19:00ID: 9437125

Cause you have quotes around RAY-XP.. it thinks that the string ends there.. take those out.
As for command and parameter not being defined, you have to add Imports system.data.sqlclient  and Imports system.data to the top of you code behind page. Good luck!
also this should look like  this
  dgYourDG.DataSource = objSPComm.ExecuteReader()
  dgYourDG.Databind() <--- from DB to DG sorry (:

 

by: michael5865Posted on 2003-09-26 at 09:16:48ID: 9437567

Well, my code has two remaining error msgs which are:
1) SqlConnection1 is not defined
2) DBDate is not a member of System.Data.SqlDbType
What do I need to add to rectify these errors?

Coding for the whole form is currently as follows:


Imports System.data.sqlclient
Imports System.data

Public Class WebForm1

    Inherits System.Web.UI.Page

    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'Put user code to initialize the page here

        Dim Conn As SqlConnection1 = "workstation id=RAY-XP; packet size=4096;user id=sa;data source=ATLANTIS;persist security info=False;initial catalog=Unison"
        Dim objSPComm As New SqlCommand("ContactCount", Conn)
        objSPComm.CommandType = CommandType.StoredProcedure

        Dim CC As SqlParameter = New SqlParameter("@StartDate", SqlDbType.DBDate, 50)
        CC.Direction = ParameterDirection.Input
        objSPComm.Parameters.Add(CC)

        Dim CC1 As SqlParameter = New SqlParameter("@EndDate", SqlDbType.DBDate, 50)
        CC1.Direction = ParameterDirection.Input
        objSPComm.Parameters.Add(CC1)

        Dim CC2 As SqlParameter = New SqlParameter("@Name", SqlDbType.VarChar, 50)
        CC2.Direction = ParameterDirection.Input
        objSPComm.Parameters.Add(CC2)


        Conn.Open()
        dgClaims.DataSource = objSPComm.ExecuteReader()
        dgClaims.DataBind()
        Conn.Close()

    End Sub

End Class

Thanks,
Michael

 

by: ghornetPosted on 2003-09-26 at 09:21:23ID: 9437601

SqlConnection1 should just be SqlConnection

and

DBDate should be DateTime

I think (:

 

by: michael5865Posted on 2003-09-26 at 10:10:44ID: 9437956

Thanks for the quick response.
Changing to DateTime fixes error msg. 2) above.

When I change  SqlConnection1 to SqlConnection, the error shifts over to the "workstation id=RAY-XP; packet....." side, stating that "Value of type "string" cannot be converted to 'System.data.sqlclient.SqlConnection' "

I though I had to declare SqlConnection1 somewhere.

What am I missing?
Michael

 

by: ghornetPosted on 2003-09-26 at 10:28:40ID: 9438081

try this..

Dim strConn as String = "workstation id=RAY-XP; packet size=4096;user id=sa;data source=ATLANTIS;persist security info=False;initial catalog=Unison"
Dim objConn as new sqlConnection(strConn)
Dim objSPComm As New SqlCommand("ContactCount", Conn)

 

by: michael5865Posted on 2003-09-26 at 12:59:16ID: 9439092

Thank you. Later, I'd like to ask you to explain the coding you gave me. For now though, even though I have no further errors in the coding, I still have a login problem. When I run the application, it fails with the following error:

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Data.SqlClient.SqlException: Login failed for user 'sa'.

Source Error:

Line 755:        objSPComm.Parameters.Add(CC2)
Line 756:
Line 757:        objConn.Open()
Line 758:        dgClaims.DataSource = objSPComm.ExecuteReader()
Line 759:        dgClaims.DataBind()
 
Source File: c:\inetpub\wwwroot\MotorolaWarrantyClaim\WebForm1.aspx.vb    Line: 757

Stack Trace:

[SqlException: Login failed for user 'sa'.]
   System.Data.SqlClient.ConnectionPool.GetConnection(Boolean& isInTransaction)
   System.Data.SqlClient.SqlConnectionPoolManager.GetPooledConnection(SqlConnectionString options, Boolean& isInTransaction)
   System.Data.SqlClient.SqlConnection.Open()
   MotorolaWarrantyClaim.WebForm1.Page_Load(Object sender, EventArgs e) in c:\inetpub\wwwroot\MotorolaWarrantyClaim\WebForm1.aspx.vb:757
   System.Web.UI.Control.OnLoad(EventArgs e)
   System.Web.UI.Control.LoadRecursive()
   System.Web.UI.Page.ProcessRequestMain()"

 Any ideas? (BTW, tell me if I am taking up too much of your time)
Michael

 

by: ghornetPosted on 2003-09-26 at 13:53:47ID: 9439485

Well I could walk you through the whole thing... but I think that you would be better to go buy a book on this stuff I use ASP.NET databases using VB.net, by wrox.. you will run into a lot of problems along the way... and I found that this book helps alot. BTW your current problem is that your username is not valid on your sql server.

20120131-EE-VQP-002

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