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(C#) ASP.NET Access BLOB Binary Data and Parameterized Query

(C#) 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

C#
Using System.Data; 
Using 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="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="ASPNetBLOB._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" 
                onclick="btnUpload_Click" />
            <input id="btnReset" type="reset" value="Reset" /></div>
       </asp:Panel>
    
    </form>
</body>
</html>


Default.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.OleDb;

namespace ASPNetBLOB
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btnUpload_Click(object sender, EventArgs e)
        {
            this.pnlForm.Visible = false;

            if (this.fUpload.HasFile == false | string.IsNullOrEmpty(this.txtName.Text))
            {
                this.lblStatus.Text = "Please input Name and Chooes File.";

            }
            else
            {
                //*** Read Binary Data ***'
                byte[] imbByte = new byte[fUpload.PostedFile.InputStream.Length + 1];
                fUpload.PostedFile.InputStream.Read(imbByte, 0, imbByte.Length);

                //*** MimeType ***'
                string ExtType = System.IO.Path.GetExtension(fUpload.PostedFile.FileName).ToLower();
                string strMIME = null;
                switch (ExtType)
                {
                    case ".gif":
                        strMIME = "image/gif";
                        break;
                    case ".jpg":
                    case ".jpeg":
                    case ".jpe":
                        strMIME = "image/jpeg";
                        break;
                    case ".png":
                        strMIME = "image/png";
                        break;
                    default:
                        this.lblStatus.Text = "Invalid file type.";
                        return;
                }

                //*** Insert to Database ***'
                OleDbConnection objConn = new OleDbConnection();
                string strConnString = null;
                string strSQL = null;

				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();

                OleDbCommand objCmd = new OleDbCommand(strSQL, objConn);
                objCmd.Parameters.Add("@sName", OleDbType.VarChar).Value = this.txtName.Text;
                objCmd.Parameters.Add("@sFilesName", OleDbType.Binary).Value = imbByte;
                objCmd.Parameters.Add("@sFilesType", OleDbType.VarChar).Value = strMIME;
                objCmd.ExecuteNonQuery();

                objConn.Close();
                objConn = null;

                this.lblStatus.Text = "File Upload Successfully. Click <a href='ListPicture.aspx'>here</a> to view.";
            }
        }

    }
}









Edit.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Edit.aspx.cs" Inherits="ASPNetBLOB.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" 
                onclick="btnUpload_Click" />
            <input id="btnReset" type="reset" value="Reset" />
            <asp:Button ID="btnDel" runat="server" Text="Delete" onclick="btnDel_Click" 
                style="height: 26px" />            
       </asp:Panel>
    </div>
    </form>
</body>
</html>


Edit.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.OleDb;

namespace ASPNetBLOB
{
    public partial class Edit : System.Web.UI.Page
    {
        OleDbConnection objConn = new OleDbConnection();
        OleDbCommand objCmd;
        string strConnString;

        string strSQL;
        protected void Page_Load(object sender, EventArgs e)
        {
            this.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 (!Page.IsPostBack)
            {
                ViewData();
            }
        }

        protected void ViewData()
        {
            //*** DataTable ***'
            OleDbDataAdapter dtAdapter = default(OleDbDataAdapter);
            DataTable dt = 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)
            {
                this.ImgPic.ImageUrl = "ViewImg.aspx?FilesID=" + dt.Rows[0]["FilesID"];
                this.txtName.Text = dt.Rows[0]["Name"].ToString();
            }

            dt = null;
        }

        protected void btnUpload_Click(object sender, EventArgs e)
        {
            this.pnlForm.Visible = false;

            if (string.IsNullOrEmpty(this.txtName.Text))
            {
                this.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 = this.txtName.Text;
                objCmd.Parameters.Add("@sFilesID", OleDbType.Integer).Value = Request.QueryString["FilesID"];
                objCmd.ExecuteNonQuery();

                //*** Update Picture ***'
                if (this.fUpload.HasFile == true)
                {
                    //*** Read Binary Data ***'
                    byte[] imbByte = new byte[fUpload.PostedFile.InputStream.Length + 1];
                    fUpload.PostedFile.InputStream.Read(imbByte, 0, imbByte.Length);

                    //*** MimeType ***'
                    string ExtType = System.IO.Path.GetExtension(fUpload.PostedFile.FileName).ToLower();
                    string strMIME = null;
                    switch (ExtType)
                    {
                        case ".gif":
                            strMIME = "image/gif";
                            break;
                        case ".jpg":
                        case ".jpeg":
                        case ".jpe":
                            strMIME = "image/jpeg";
                            break;
                        case ".png":
                            strMIME = "image/png";
                            break;
                        default:
                            this.lblStatus.Text = "Invalid file type.";
                            return;
                    }

                    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();

                }

                this.lblStatus.Text = "File Upload Successfully. Click <a href='ListPicture.aspx'>here</a> to view.";
            }
        }

        protected void btnDel_Click(object sender, EventArgs e)
        {
            this.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();
            this.lblStatus.Text = "Delete Successfully. Click <a href='ListPicture.aspx'>here</a> to view.";

        }

        protected void Page_Unload(object sender, System.EventArgs e)
        {
            objConn.Close();
            objConn = null;
        }

    }
}


ListPicture.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ListPicture.aspx.cs" Inherits="ASPNetBLOB.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" 
            onrowdatabound="myGridView_RowDataBound">
	<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.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.OleDb;

namespace ASPNetBLOB
{
    public partial class ListPicture : System.Web.UI.Page
    {
        OleDbConnection objConn;
        OleDbCommand objCmd;
        protected void Page_Load(object sender, EventArgs e)
        {
            string strConnString = null;
            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();
        }

        protected void BindData()
        {
            string strSQL = null;
            strSQL = "SELECT * FROM files ORDER BY FilesID ASC";

            OleDbDataReader dtReader = default(OleDbDataReader);
            objCmd = new OleDbCommand(strSQL, objConn);
            dtReader = objCmd.ExecuteReader();

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

            dtReader.Close();
            dtReader = null;
        }

        protected void myGridView_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            //*** FilesID ***'
            Label lblFilesID = (Label)e.Row.FindControl("lblFilesID");
            if ((lblFilesID != null))
            {
                lblFilesID.Text = DataBinder.Eval(e.Row.DataItem, "FilesID").ToString();
            }

            //*** Name ***'
            Label lblName = (Label)e.Row.FindControl("lblName");
            if ((lblName != null))
            {
                lblName.Text = DataBinder.Eval(e.Row.DataItem, "Name").ToString();
            }

            //*** Picture ***'
            Image ImgPic = (Image)e.Row.FindControl("ImgPic");
            if ((ImgPic != null))
            {
                ImgPic.ImageUrl = "ViewImg.aspx?FilesID= " + DataBinder.Eval(e.Row.DataItem, "FilesID").ToString();
            }

            //*** Hyperlink ***'
            HyperLink hplEdit = (HyperLink)e.Row.FindControl("hplEdit");
            if ((hplEdit != null))
            {
                hplEdit.Text = "Edit";
                hplEdit.NavigateUrl = "Edit.aspx?FilesID=" + DataBinder.Eval(e.Row.DataItem, "FilesID").ToString();
            }
        }

        protected void Page_Unload(object sender, EventArgs e)
        {
            objConn.Close();
            objConn = null;
        }
    }
}


ViewImg.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ViewImg.aspx.cs" Inherits="ASPNetBLOB.ViewImg" %>


ViewImg.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.OleDb;

namespace ASPNetBLOB
{
    public partial class ViewImg : System.Web.UI.Page
    {
        OleDbConnection objConn = new OleDbConnection();
        OleDbCommand objCmd;
        string strConnString;
        string strSQL;

        protected void Page_Load(object sender, EventArgs e)
        {
            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 ***'
            OleDbDataAdapter dtAdapter = default(OleDbDataAdapter);
            DataTable dt = 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"].ToString();
            dtAdapter.Fill(dt);

            if (dt.Rows.Count > 0)
            {
                Response.ContentType = dt.Rows[0]["FilesType"].ToString();
                Response.BinaryWrite((byte[])dt.Rows[0]["FilesName"]);
            }

            dt = null;
        }

        protected void Page_Unload(object sender, System.EventArgs e)
        {
            objConn.Close();
            objConn = null;
        }
    }
}









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  (C#) ASP.NET Access BLOB Binary Data and Parameterized Query
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