VB.NET ASP.NET Sql Command Update Statement Source Code Example
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Sql Command Update Statement
Purpose: – Illustrates using Sql Command Update Statement in VB.NET ASP.NET.
Prerequistes:
- Install Visual Web Developer 2008
- Install SQL Server Express
- Download Northwind and Pubs Databases
- Attach Northwind Database to Databases in Sql Express
- Attach pubs Database to Databases in Sql Express
Notes:
- You can build your own library of syntax examples by using same web site over and over and just add new web forms to it.
Instructions:
- Use Visual Web Developer 2008
- Create new web site;
- Click File/New Web Site
- Select ASP.NET Website Template
- Select Visual Basic for Language
- name of Web Site could be VBNET_ASPNET_Syntax.
- Add New folder named "Database_ADONET"
- Right-click project name in solution explorer;
- add new folder;
- name of folder could be: Database_ADONET
- Add Web Form Named SqlCommandUpdate to Database_ADONET folder
- Right-click Database_ADONET folder;
- add new item;
- Select Web Form
- Check place code behind in separate file
- Web Form name could be SqlCommandUpdate
- Click on copy code in code below to copy code into web form SqlCommandUpdate.aspx
- Click on copy code in second set of code below to copy code into code-behind SqlCommandUpdate.aspx.vb
- Right-click on SqlCommandUpdate.aspx in solution explorer and select view in browser
Step 1: Click on Copy Code to Cut-n-paste code into SqlCommandUpdate.aspx
| XML | | copy code | | ? |
< %@ Page Language="VB" AutoEventWireup="false" CodeFile="SqlCommandUpdate.aspx.vb" Inherits="Database_ADONET_SqlCommandUpdate" %> |
< !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
<html xmlns="http://www.w3.org/1999/xhtml"> |
<head runat="server"> |
<title></title> |
</head> |
<body> |
<form id="form1" runat="server"> |
<div> |
<table> |
<tr> |
<td>Find this First Name: </td><td> |
<asp:textbox ID="txtFirstName" runat="server"></asp:textbox> |
</td> |
</tr> |
<tr> |
<td>Update Last Name with this: </td><td> |
<asp:textbox ID="txtLastName" runat="server"></asp:textbox> |
</td> |
</tr> |
</table><br /> |
<asp:button ID="btnUpdate" runat="server" Text="Update" /><br /> |
<asp:label ID="lblErrMsg" runat="server" Text="lblErrMsg" ForeColor="#FF3300" |
Visible="False"></asp:label><br /> |
<asp:gridview ID="GridView1" runat="server" DataSourceID="sdsEmployees"> |
</asp:gridview> |
<asp:sqldatasource ID="sdsEmployees" runat="server" |
ConnectionString="<%$ ConnectionStrings:Northwind_ConnectionString %>" |
SelectCommand="SELECT [FirstName], [LastName] FROM [Employees]"> |
</asp:sqldatasource> |
</div> |
</form> |
</body> |
</html> |
Step 2: Click on Copy Code to Cut-n-paste code into SqlCommandUpdate.aspx.vb
| Visual Basic | | copy code | | ? |
Imports System |
Imports System.Data |
Imports System.Data.SqlClient |
Partial Class Database_ADONET_SqlCommandUpdate |
Inherits System.Web.UI.Page |
Protected Sub btnUpdate_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnUpdate.Click |
Dim thisConnection As New SqlConnection(ConfigurationManager.ConnectionStrings("Northwind_ConnectionString").ConnectionString) |
'Create Command object |
Dim nonqueryCommand As SqlCommand = thisConnection.CreateCommand() |
Try |
' Open Connection |
thisConnection.Open() |
' 1. Create Command |
' Sql Update Statement |
Dim updateSql As String = _ |
"UPDATE Employees " & _ |
"SET LastName = @LastName " & _ |
"WHERE FirstName = @FirstName" |
Dim UpdateCmd As New SqlCommand(updateSql, thisConnection) |
' 2. Map Parameters |
UpdateCmd.Parameters.Add("@FirstName", _ |
SqlDbType.NVarChar, 10, "FirstName") |
UpdateCmd.Parameters.Add("@LastName", _ |
SqlDbType.NVarChar, 20, "LastName") |
UpdateCmd.Parameters("@FirstName").Value = txtFirstName.Text |
UpdateCmd.Parameters("@LastName").Value = txtLastName.Text |
UpdateCmd.ExecuteNonQuery() |
Catch ex As SqlException |
' Display error |
lblErrMsg.Text = ex.ToString() |
lblErrMsg.Visible = True |
Finally |
' Close Connection |
thisConnection.Close() |
End Try |
GridView1.DataBind() |
End Sub |
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load |
lblErrMsg.Visible = False |
End Sub |
End Class |
Step 3: Click on Copy Code to Cut-n-paste code into web.config right after the appSettings section
| XML | | copy code | | ? |
<connectionstrings> |
<add name="Northwind_ConnectionString" |
connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI" /> |
<add name="Pubs_ConnectionString" |
connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=pubs;Integrated Security=SSPI" /> |
</connectionstrings> |
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