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ASP.NET Access BLOB Binary Data and Parameterized Query

ASP.NET Access BLOB Binary Data and Parameterized Query เขียน ASP.NET เพื่อจัดการข้อมูลใน Database Access ผ่าน Binary Data ในรูปแบบของ BLOB โดยคำสั่ง Execute Add/Insert/Update และ Delete ใช้รูปแบบการส่งข้อมูล Parameter เพื่อไช้ในการ Query Data (Using Parameterized Queries)

Instance NameSpace

VB.NET
Imports System.Data 
Imports System.Data.OleDb 


ASP.NET & System.Data.OleDb

โครงสร้างของฐานข้อมูล Microsoft Access

ASP.NET Access BLOB Binary Data

หรือสามารถดาวน์โหลดได้จากตัวข้างล่าง

เริ่มต้นด้วยการสร้าง Project ใหม่บน Visual Studio เลือก Application เป็น ASP.NET Web Site

ASP.NET Access BLOB Binary Data

ตั้งชื่อ Project เป็น ASPNetBLOB เลือกภาษาที่ต้องการ สามารถใช้ได้กับ .NET Framework ทุกเวอร์ชั่น

สร้างไฟล์และ Code ทั้งหมดตามในตัวอย่าง

Language Code : VB.NET || C#

Default.aspx

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>

<!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>ThaiCreate.Com Tutorials</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        <asp:Label ID="lblStatus" runat="server" 
            Text="Please input Name and Chooes File. "></asp:Label>
        <br />
        
        <asp:Panel ID="pnlForm" Visible="true" runat="server">
            <asp:Label ID="lblName" runat="server" Text="Name :" Width="50px"></asp:Label>
            <asp:TextBox ID="txtName" runat="server"></asp:TextBox>
            <br />
            <asp:Label ID="lblPicture" runat="server" Text="Picture :" Width="50px"></asp:Label>
            <asp:FileUpload ID="fUpload" runat="server" />
            <br />
            <asp:Button ID="btnUpload" runat="server" Text="Upload" />
            <input id="btnReset" type="reset" value="Reset" /></div>
       </asp:Panel>
    
    </form>
</body>
</html>


Default.aspx.vb

Imports System.Data
Imports System.Data.OleDb

Partial Class _Default
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    End Sub

    Protected Sub btnUpload_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnUpload.Click
        Me.pnlForm.Visible = False

        If Me.fUpload.HasFile = False Or Me.txtName.Text = "" Then
            Me.lblStatus.Text = "Please input Name and Chooes File."
        Else

            '*** Read Binary Data ***'
            Dim imbByte(fUpload.PostedFile.InputStream.Length) As Byte
            fUpload.PostedFile.InputStream.Read(imbByte, 0, imbByte.Length)

            '*** MimeType ***'
            Dim ExtType As String = System.IO.Path.GetExtension(fUpload.PostedFile.FileName).ToLower()
            Dim strMIME As String = Nothing
            Select Case ExtType
                Case ".gif"
                    strMIME = "image/gif"
                Case ".jpg", ".jpeg", ".jpe"
                    strMIME = "image/jpeg"
                Case ".png"
                    strMIME = "image/png"
                Case Else
                    Me.lblStatus.Text = "Invalid file type."
                    Exit Sub
            End Select

            '*** Insert to Database ***'
            Dim objConn As New OleDbConnection
            Dim strConnString, strSQL As String

			strConnString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="& _
			Server.MapPath("App_Data/mydatabase.mdb")&";Jet OLEDB:Database Password=;"

            strSQL = "INSERT INTO files (Name,FilesName,FilesType) " & _
            " VALUES " & _
            " (@sName,@sFilesName,@sFilesType)"
            objConn.ConnectionString = strConnString
            objConn.Open()

            Dim objCmd As New OleDbCommand(strSQL, objConn)
            objCmd.Parameters.Add("@sName", OleDbType.VarChar).Value = Me.txtName.Text
            objCmd.Parameters.Add("@sFilesName", OleDbType.Binary).Value = imbByte
            objCmd.Parameters.Add("@sFilesType", OleDbType.VarChar).Value = strMIME
            objCmd.ExecuteNonQuery()

            objConn.Close()
            objConn = Nothing

            Me.lblStatus.Text = "File Upload Successfully. Click <a href='ListPicture.aspx'>here</a> to view."
        End If
    End Sub

End Class









Edit.aspx

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Edit.aspx.vb" Inherits="Edit" %>

<!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>ThaiCreate.Com Tutorials</title>
</head>
<body>
<form id="form1" runat="server">
    <div>
    
        <asp:Label ID="lblStatus" runat="server" 
            Text="Please input Name and Chooes File. "></asp:Label>
        <br />
        
        <asp:Panel ID="pnlForm" Visible="true" runat="server">
            <asp:Image ID="ImgPic" runat="server" />
            <br />
            <asp:Label ID="lblName" runat="server" Text="Name :" Width="50px"></asp:Label>
            <asp:TextBox ID="txtName" runat="server"></asp:TextBox>
            <br />
            <asp:Label ID="lblPicture" runat="server" Text="Picture :" Width="50px"></asp:Label>
            <asp:FileUpload ID="fUpload" runat="server" />
            <br />
            <asp:Button ID="btnUpload" runat="server" Text="Upload" />
            <input id="btnReset" type="reset" value="Reset" />
            <asp:Button ID="btnDel" runat="server" Text="Delete" />            
       </asp:Panel>
    </div>
    </form>
</body>
</html>


Edit.aspx.vb

Imports System.Data
Imports System.Data.OleDb

Partial Class Edit
    Inherits System.Web.UI.Page

    Dim objConn As New OleDbConnection
    Dim objCmd As OleDbCommand
    Dim strConnString, strSQL As String

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        Me.btnDel.Attributes.Add("OnClick", "return confirm('Are you sure delete?');")

        strConnString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="& _
		Server.MapPath("App_Data/mydatabase.mdb")&";Jet OLEDB:Database Password=;"
        objConn.ConnectionString = strConnString
        objConn.Open()

        If Not Page.IsPostBack() Then
            ViewData()
        End If
    End Sub

    Protected Sub ViewData()
        '*** DataTable ***'
        Dim dtAdapter As OleDbDataAdapter
        Dim dt As New DataTable
        strSQL = "SELECT * FROM files WHERE FilesID = @sFilesID "
        dtAdapter = New OleDbDataAdapter(strSQL, objConn)
        objCmd = dtAdapter.SelectCommand
        objCmd.Parameters.Add("@sFilesID", OleDbType.Integer).Value = Request.QueryString("FilesID")
        dtAdapter.Fill(dt)

        If dt.Rows.Count > 0 Then
            Me.ImgPic.ImageUrl = "ViewImg.aspx?FilesID=" & dt.Rows(0)("FilesID")
            Me.txtName.Text = dt.Rows(0)("Name")
        End If

        dt = Nothing
    End Sub

    Protected Sub btnUpload_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnUpload.Click
        Me.pnlForm.Visible = False

        If Me.txtName.Text = "" Then
            Me.lblStatus.Text = "Please input Name."
        Else

            '*** Update Name ***'
            strSQL = "UPDATE files SET Name = @sName " & _
                   " WHERE FilesID = @sFilesID "

            objCmd = New OleDbCommand(strSQL, objConn)
            objCmd.Parameters.Add("@sName", OleDbType.VarChar).Value = Me.txtName.Text
            objCmd.Parameters.Add("@sFilesID", OleDbType.Integer).Value = Request.QueryString("FilesID")
            objCmd.ExecuteNonQuery()

            '*** Update Picture ***'
            If Me.fUpload.HasFile = True Then
                '*** Read Binary Data ***'
                Dim imbByte(fUpload.PostedFile.InputStream.Length) As Byte
                fUpload.PostedFile.InputStream.Read(imbByte, 0, imbByte.Length)

                '*** MimeType ***'
                Dim ExtType As String = System.IO.Path.GetExtension(fUpload.PostedFile.FileName).ToLower()
                Dim strMIME As String = Nothing
                Select Case ExtType
                    Case ".gif"
                        strMIME = "image/gif"
                    Case ".jpg", ".jpeg", ".jpe"
                        strMIME = "image/jpeg"
                    Case ".png"
                        strMIME = "image/png"
                    Case Else
                        Me.lblStatus.Text = "Invalid file type."
                        Exit Sub
                End Select

                strSQL = "UPDATE files SET FilesName = @sFilesName , FilesType = @sFilesType  " & _
                       " WHERE FilesID = @sFilesID "

                objCmd = New OleDbCommand(strSQL, objConn)
                objCmd.Parameters.Add("@sFilesName", OleDbType.Binary).Value = imbByte
                objCmd.Parameters.Add("@sFilesType", OleDbType.VarChar).Value = strMIME
                objCmd.Parameters.Add("@sFilesID", OleDbType.Integer).Value = Request.QueryString("FilesID")
                objCmd.ExecuteNonQuery()

            End If

            Me.lblStatus.Text = "File Upload Successfully. Click <a href='ListPicture.aspx'>here</a> to view."
        End If
    End Sub

    Protected Sub btnDel_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDel.Click
        Me.pnlForm.Visible = False
        '*** Delete Rows ***'
        strSQL = "DELETE FROM files  " & _
               " WHERE FilesID = @sFilesID "

        objCmd = New OleDbCommand(strSQL, objConn)
        objCmd.Parameters.Add("@sFilesID", OleDbType.Integer).Value = Request.QueryString("FilesID")
        objCmd.ExecuteNonQuery()
        Me.lblStatus.Text = "Delete Successfully. Click <a href='ListPicture.aspx'>here</a> to view."
    End Sub

    Protected Sub Page_Unload(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Unload
        objConn.Close()
        objConn = Nothing
    End Sub

End Class


ListPicture.aspx

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="ListPicture.aspx.vb" Inherits="ListPicture" %>

<!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>ThaiCreate.Com Tutorials</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
 <asp:GridView id="myGridView" runat="server" AutoGenerateColumns="False">
	<Columns>
	<asp:TemplateField HeaderText="ID">
		<ItemTemplate>
			<asp:Label id="lblFilesID" runat="server"></asp:Label>
		</ItemTemplate>
	</asp:TemplateField>

	<asp:TemplateField HeaderText="Name">
		<ItemTemplate>
			<asp:Label id="lblName" runat="server"></asp:Label>
		</ItemTemplate>
	</asp:TemplateField>

	<asp:TemplateField HeaderText="Picture">
		<ItemTemplate>
			<asp:Image ID="ImgPic" runat="server" />
		</ItemTemplate>
	</asp:TemplateField>

	<asp:TemplateField HeaderText="Edit">
		<ItemTemplate>
            <asp:HyperLink ID="hplEdit" runat="server">Edit</asp:HyperLink>
        </ItemTemplate>
	</asp:TemplateField>

	</Columns>
</asp:GridView>
    
    </div>
    </form>
</body>
</html>


ListPicture.aspx.vb

Imports System.Data
Imports System.Data.OleDb

Partial Class ListPicture
    Inherits System.Web.UI.Page

    Dim objConn As OleDbConnection
    Dim objCmd As OleDbCommand

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim strConnString As String
        strConnString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="& _
		Server.MapPath("App_Data/mydatabase.mdb")&";Jet OLEDB:Database Password=;"
        objConn = New OleDbConnection(strConnString)
        objConn.Open()

        BindData()
    End Sub

    Protected Sub BindData()
        Dim strSQL As String
        strSQL = "SELECT * FROM files ORDER BY FilesID ASC"

        Dim dtReader As OleDbDataReader
        objCmd = New OleDbCommand(strSQL, objConn)
        dtReader = objCmd.ExecuteReader()

        '*** BindData to GridView ***'
        myGridView.DataSource = dtReader
        myGridView.DataBind()

        dtReader.Close()
        dtReader = Nothing
    End Sub

    Protected Sub Page_Unload(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Unload
        objConn.Close()
        objConn = Nothing
    End Sub

    Protected Sub myGridView_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles myGridView.RowDataBound
        '*** FilesID ***'
        Dim lblFilesID As Label = DirectCast(e.Row.FindControl("lblFilesID"), Label)
        If Not IsNothing(lblFilesID) Then
            lblFilesID.Text = e.Row.DataItem("FilesID")
        End If

        '*** Name ***'
        Dim lblName As Label = DirectCast(e.Row.FindControl("lblName"), Label)
        If Not IsNothing(lblName) Then
            lblName.Text = e.Row.DataItem("Name")
        End If

        '*** Picture ***'
        Dim ImgPic As Image = DirectCast(e.Row.FindControl("ImgPic"), Image)
        If Not IsNothing(ImgPic) Then
            ImgPic.ImageUrl = "ViewImg.aspx?FilesID= " & e.Row.DataItem("FilesID")
        End If

        '*** Hyperlink ***'
        Dim hplEdit As HyperLink = DirectCast(e.Row.FindControl("hplEdit"), HyperLink)
        If Not IsNothing(hplEdit) Then
            hplEdit.Text = "Edit"
            hplEdit.NavigateUrl = "Edit.aspx?FilesID=" & e.Row.DataItem("FilesID")
        End If

    End Sub

End Class


ViewImg.aspx

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="ViewImg.aspx.vb" Inherits="ViewImg" %>


ViewImg.aspx.vb

Imports System.Data
Imports System.Data.OleDb

Partial Class ViewImg
    Inherits System.Web.UI.Page

    Dim objConn As New OleDbConnection
    Dim objCmd As OleDbCommand
    Dim strConnString, strSQL As String

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        strConnString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="& _
		Server.MapPath("App_Data/mydatabase.mdb")&";Jet OLEDB:Database Password=;"
        objConn.ConnectionString = strConnString
        objConn.Open()

        '*** DataTable ***'
        Dim dtAdapter As OleDbDataAdapter
        Dim dt As New DataTable
        strSQL = "SELECT * FROM files WHERE FilesID = @sFilesID "
        dtAdapter = New OleDbDataAdapter(strSQL, objConn)
        objCmd = dtAdapter.SelectCommand
        objCmd.Parameters.Add("@sFilesID", OleDbType.Integer).Value = Request.QueryString("FilesID")
        dtAdapter.Fill(dt)

        If dt.Rows.Count > 0 Then
            Response.ContentType = dt.Rows(0)("FilesType").ToString()
            Response.BinaryWrite(dt.Rows(0)("FilesName"))
        End If

        dt = Nothing
    End Sub

    Protected Sub Page_Unload(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Unload
        objConn.Close()
        objConn = Nothing
    End Sub

End Class









Screenshot

ASP.NET Access BLOB Binary Data

หน้าจอสำหรับอัพโหลด (Upload Binary) ข้อมูลลงใน BLOB


ASP.NET Access BLOB Binary Data

หน้าจอสำหรับแสดงข้อมูล (View BLOB)


ASP.NET Access BLOB Binary Data

หน้าจอสำหรับแก้ไขข้อมูล (Edit BLOB)


ASP.NET Access BLOB Binary Data

หน้าจอสำหรับการลบข้อมูล (Delete BLOB)



ASP.NET System.Data.OleDb - Parameter Query


ASP.NET & System.Data.OleDb


   
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ช่วยกันสนับสนุนรักษาเว็บไซต์ความรู้แห่งนี้ไว้ด้วยการสนับสนุน Source Code 2.0 ของทีมงานไทยครีเอท


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  By : ThaiCreate.Com Team (บทความเป็นลิขสิทธิ์ของเว็บไทยครีเอทห้ามนำเผยแพร่ ณ เว็บไซต์อื่น ๆ)
  Score Rating :  
  Create/Update Date : 2011-06-02 13:23:16 / 2017-03-29 09:52:48
  Download : Download  ASP.NET Access BLOB Binary Data and Parameterized Query
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