(Xóa nhiều dòng dữ liệu được chọn trong Asp.net GridView) – Có nhiều cách để thực hiện xóa dữ liệu trong Database như: trong các Form thêm, sửa hoặc xóa trực tiếp từng dòng từ danh sách dữ liệu trên Gridview. Với các cách xóa dữ liệu trên sẽ phải mất nhiều thời gian để thực hiện nếu Database có nhiều bản ghi. Vậy làm sao để có thể xóa nhiều bản ghi chỉ bởi 1 lần click. Bài viết dưới đây sẽ hướng dẫn các bạn cách để xóa nhiều bản ghi trong Gridview khi được chọn. Trước khi xóa hộp thoại xác nhận sẽ hiển thị và sau khi xóa xong sẽ có thông báo số lượng bản ghi đã được xóa.
- B1: Tạo CSDL Customers trong SQL Server
- B2: Tạo Bảng Accounts có cấu trúc phía dưới
| STT | Tên trường | Kiểu trường | Ghi chú |
| 1 | AccountID | Int | Trường tự tăng |
| 2 | AccountCode | nvarchar(25) | |
| 3 | AccName | nvarchar(250) | |
| 4 | AccAddress | nvarchar(250) | |
| 5 | AccPhone | nvarchar(50) | |
| 6 | AccFAX | nvarchar(50) | |
| 7 | AccEmail | nvarchar(50) | |
| 8 | AccWebsite | nvarchar(150) | |
| 9 | AccDesc | nvarchar(1500) | |
| 10 | CreatedDate | datetime | |
| 11 | ModifiedDate | datetime |
- B3: Nhập dữ liệu cho bảng Accounts
- B4: Tạo stored procedure trong SQL Server
USE[Customers]
GO
CREATE PROCEDURE [dbo].[Pro_Accounts_List]
@Keyword nvarchar(250),
@SortField nvarchar(50),
@SortType nvarchar(10)
AS
declare@strSQL nvarchar(1000)
declare @strWhere nvarchar(500)
declare @strOrder nvarchar (50)
set @strSQL= 'Select * from Accounts'
set @strWhere =' Where 1=1 '
if @Keyword<>''
set @strWhere= @strWhere +' And (AccountCode like N''%' +@Keyword+'%''
Or AccName like N''%' +@Keyword+'%'' Or AccAddress like N''%' +@Keyword+'%''
Or AccPhone like N''%' +@Keyword+'%'' Or AccFAX like N''%' +@Keyword+'%''
Or AccEmail like N''%' +@Keyword+'%'' Or AccWebsite like N''%' +@Keyword+'%'')'
if @SortField='CreatedDate'
Begin
set @strOrder =' Order by CreatedDate'
End
Else
Begin
set @strOrder =' Order by AccName'
End
set @strSQL=@strSQL+@strWhere+@strOrder
print @strSQL
exec sp_executesql @strSQL
Go
CREATE PROCEDURE [dbo].[Pro_Accounts_Delete]
@AccountID int
AS
DELETE FROM Accounts
WHERE
AccountID = @AccountID
Go
Bạn có thể tải về bảng cơ sở dữ liệu SQL bằng cách nhấn vào liên kết tải về dưới đây
Trong Visual Studio tạo 1 Class có tên: Utility và nhập đoạn Code phía dưới cho Class này.
Imports System.Data.SqlClient
Imports System.Data
Namespace DeleteMultipleRowsUsingCheckboxes
Public Class SqlDataProvider
#Region "Membres Prives"
Shared _IsError As Boolean = False
Private _connectionString AsString
#End Region
#Region "Constructeurs"
Public Sub New()
Try
_connectionString = ConfigurationManager.ConnectionStrings("SiteSqlServer").ConnectionString
_IsError = False
Catch ex As Exception
_IsError = True
End Try
End Sub
#End Region
#Region "Proprietes"
Public ReadOnly Property ConnectionString() AsString
Get
Return _connectionString
End Get
End Property
#End Region
#Region "Functions"
Public FunctionFillTable(ByVal ProcName As String, ByVal ParamArrayPara() As ObjectPara) As DataTable
Try
Dim tb AsNew DataTable
Dim adap AsNew SqlDataAdapter(ProcName, _connectionString)
adap.SelectCommand.CommandType = CommandType.StoredProcedure
If NotPara Is NothingThen
For Eachp As ObjectParaIn Para
adap.SelectCommand.Parameters.Add(New SqlParameter(p.Name, p.Value))
Next
End If
adap.Fill(tb)
Return tb
Catch ex As Exception
Return Nothing
End Try
End Function
Public FunctionRunSQL(ByVal ProcName AsString, ByVal ParamArray Para() As ObjectPara) As Object
Try
Dim _cnn AsNew SqlConnection(_connectionString)
_cnn.Open()
Dim cmd AsNew SqlCommand(ProcName, _cnn)
cmd.CommandType = CommandType.StoredProcedure
For Eachp As ObjectParaIn Para
cmd.Parameters.Add(New SqlParameter(p.Name, p.Value))
Next
Return cmd.ExecuteScalar
Catch ex As Exception
Return Nothing
End Try
End Function
#End Region
End Class
Public Class ObjectPara
Dim _name As String
Dim _Value As Object
Sub New(ByVal Pname As String, ByVal PValue As Object)
_name = Pname
_Value = PValue
End Sub
Public PropertyName() As String
Get
Return _name
End Get
Set(ByVal value As String)
_name = value
End Set
End Property
Public PropertyValue() As Object
Get
Return _Value
End Get
Set(ByVal value As Object)
_Value = value
End Set
End Property
End Class
End Namespace
Chú ý: Thuộc tính SiteSqlServer chính là chuỗi Connect với SQL Server trong file Web.Config
- B6: Mở file Default.aspxdưới dạng HTML và nhập mã HTML
<%@ PageTitle="Delete Multiple Rows in Asp.net Gridview using Checkboxes" Language="vb"MasterPageFile="~/Site.Master"AutoEventWireup="false"EnableEventValidation="false" CodeBehind="Default.aspx.vb" Inherits="DeleteMultipleRowsUsingCheckboxes._Default"%>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<asp:ScriptManager ID="ScriptManager1"runat="server">
</asp:ScriptManager>
<h3>
Delete Multiple Rows in Asp.net Gridview using Checkboxes
</h3>
<asp:UpdatePanel ID="updatePanel"runat="server"UpdateMode="Conditional">
<ContentTemplate>
<table cellpadding="2"cellspacing="3"width="100%">
<tr>
<td>
<asp:LinkButton id="cmdDelete" runat="server" CssClass="btn btn-small" Causesvalidation="false" Text="Delete">
</asp:LinkButton>
</td>
<tdalign="right">
<asp:Label ID="plKeyword" runat="server" Text="Keyword"></asp:Label>
<asp:TextBox ID="txtSearch" CssClass="form-control" ToolTip="Enter Keyword" runat="server" width="200px"></asp:TextBox>
<asp:ImageButton ID="cmdQuickSearch" runat="server" causesvalidation="false" imageurl="~/images/icon_search.gif"></asp:ImageButton>
</td>
</tr>
<trid="trMessage"runat="server"visible="false">
<tdcolspan="2">
<asp:Label ID="lblMessage" runat="server" Text="No Data"></asp:Label>
</td>
</tr>
<tr>
<tdcolspan="2">
<asp:GridView ID="grvObject" runat="server" AllowPaging="true" PageSize="12"
CssClass="GridStyle"BorderColor="#cbcbcb"BorderStyle="solid"
BorderWidth="1"AutoGenerateColumns="false"DataKeyNames="AccountID"width="100%">
<AlternatingRowStyle CssClass="GridStyle_AltRowStyle" />
<HeaderStyle CssClass="GridStyle_HeaderStyle"/>
<RowStyle CssClass="GridStyle_RowStyle"/>
<pagerstyle cssclass="GridStyle_pagination"/>
<Columns>
<asp:TemplateField>
<ItemStyle HorizontalAlign="Center"width="1%"/>
<HeaderTemplate>
<asp:CheckBox ID="chkAll" runat="server"/>
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="chkSelect"runat="server"/>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText = "Number">
<ItemStyle HorizontalAlign="Center"Width="2%"></ItemStyle>
<ItemTemplate>
<asp:Label ID="lblRowNumber"Text='<%# Container.DataItemIndex + 1 %>' runat="server"/>
<asp:Label ID="lblItemID" Text='<%# Eval("AccountID") %>' Visible="false"runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField ItemStyle-Width="10%"DataField="AccountCode"HeaderText="AccountCode"/>
<asp:BoundField ItemStyle-Width="15%"DataField="AccName"HeaderText="AccountName"/>
<asp:BoundField ItemStyle-Width="10%"DataField="AccPhone"HeaderText="Phone"/>
<asp:BoundField ItemStyle-Width="10%"DataField="AccFAX"HeaderText="FAX"/>
<asp:BoundField ItemStyle-Width="15%"DataField="AccEmail"HeaderText="Email"/>
</Columns>
</asp:GridView>
</td>
</tr>
</table>
</ContentTemplate>
</asp:UpdatePanel>
</asp:Content>- B7: Viết Code cho file Default.aspx
'Visit http://thuthuatlaptrinh.blogspot.com for more ASP.NET Tutorials
Imports System.Data.SqlClient
Namespace DeleteMultipleRowsUsingCheckboxes
Public Class _Default
Inherits System.Web.UI.Page
#Region "Private Methods"
Private SubShowMessage(ByVal iCount As Integer)
Dim sMessage As String = iCount.ToString() & " records deleted."
ScriptManager.RegisterClientScriptBlock(Me.Page, Me.Page.GetType(), "alert", "alert('"& sMessage & "');", True)
End Sub
Private SubDeleteRecord(ByVal ItemID As Integer)
Dim objSQL As New SqlDataProvider
objSQL.RunSQL("Pro_Accounts_Delete", New ObjectPara("@AccountID", ItemID))
End Sub
#End Region
#Region "Bind Data"
Private SubBindAccount()
Dim objBind As New DataTable
objBind = BindData()
If Not objBind Is Nothing Then
If objBind.Rows.Count > 0 Then
grvObject.DataSource = objBind
grvObject.DataBind()
trMessage.Visible = False
grvObject.Visible = True
cmdDelete.Visible = True
Else
trMessage.Visible = True
grvObject.Visible = False
cmdDelete.Visible = False
End If
updatePanel.Update()
End If
End Sub
Private FunctionBindData() As DataTable
Dim objSQL As New SqlDataProvider
Dim objBind As DataTable = objSQL.FillTable("Pro_Accounts_List", New ObjectPara("@Keyword", txtSearch.Text.Trim), _
New ObjectPara("@SortField", "CreatedDate"), _
New ObjectPara("@SortType", "DESC"))
Return objBind
End Function
#End Region
#Region "GridView Methods"
Private SubgrvObject_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs) HandlesgrvObject.RowDataBound
If e.Row.RowType = DataControlRowType.DataRow Then
End If
End Sub
Private SubgrvObject_PageIndexChanging(ByVal sender As Object, ByVal e AsSystem.Web.UI.WebControls.GridViewPageEventArgs) Handles grvObject.PageIndexChanging
grvObject.PageIndex = e.NewPageIndex
BindAccount()
End Sub
#End Region
#Region "Event Handles"
Protected SubPage_Load(ByVal sender AsObject, ByVal e As System.EventArgs) Handles Me.Load
Try
cmdDelete.Attributes.Add("onClick", ("javascript:return confirm('"& "Do you want to Delete Selected Record?" & " ');"))
If Page.IsPostBack = False Then
'Default Submit Button
Page.Form.DefaultButton = cmdQuickSearch.UniqueID
BindAccount()
End If
Catch ex As Exception
End Try
End Sub
Private SubcmdQuickSearch_Click(ByVal sender As Object, ByVal e As System.EventArgs) HandlescmdQuickSearch.Click
BindAccount()
End Sub
Protected SubcmdDelete_Click(ByVal sender As Object, ByVal e As System.EventArgs) HandlescmdDelete.Click
Try
Dim intCount AsInteger = grvObject.Rows.Count
Dim chkSelect AsCheckBox
Dim lblLabel AsLabel
Dim i AsInteger
Dim iCount AsInteger = 0
For i = 0 TointCount - 1
chkSelect = CType(grvObject.Rows(i).FindControl("chkSelect"), CheckBox)
lblLabel = CType(grvObject.Rows(i).FindControl("lblItemID"), Label)
If NotchkSelect Is NothingAnd NotlblLabel Is NothingThen
Dim AccountID As String = ""
If Not lblLabel Is Nothing Then
AccountID = lblLabel.Text
End If
If AccountID <> -1 AndAlsochkSelect.Checked Then
DeleteRecord(AccountID)
iCount += 1
EndIf
End If
Next
BindAccount()
ShowMessage(iCount)
Catch ex As Exception
End Try
End Sub
#End Region
End Class
End Namespace
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