如何用C#向ACCESS数据库插入图片？

最新推荐文章于 2019-10-18 16:38:42 发布

原创最新推荐文章于 2019-10-18 16:38:42 发布 · 1.9k 阅读

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#access #数据库 #c# #server #datagrid #asp

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这篇博客展示了如何使用C#将图片上传并插入到Access数据库中。通过创建一个ASP.NET网页，用户可以上传文件，然后利用OleDbConnection和OleDbCommand对象执行SQL插入语句，将文件数据存储到数据库的二进制字段。

<%@ Page language="c#" Debug="true" Codebehind="Image2Access.aspx.cs" AutoEventWireup="false" Inherits="eMeng.Exam.Image2Access" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>上传文件到 Access 数据库</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="DataGridShowImage" method="post" runat="server" enctype="multipart/form-data">
<h3 align="center">上传文件到 Access 数据库</h3>
<asp:DataGrid ID="DG_Persons" AutoGenerateColumns="False" Width="99%" HeaderStyle-BackColor="#ff0000"
HeaderStyle-Font-Bold="True" HeaderStyle-ForeColor="#ffffff" ItemStyle-BackColor="Beige" BorderColor="#000000"
Runat="server" HeaderStyle-HorizontalAlign="Center">
<Columns>
<asp:TemplateColumn HeaderText="姓名">
<ItemTemplate>
<asp:Label Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "PersonName") %>' ID="Label1"/>
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="电子邮件">
<ItemTemplate>
<asp:Label Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "PersonEmail") %>' ID="Label2"/>
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="性别">
<ItemTemplate>
<asp:Label Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "PersonSex") %>' ID="Label3"/>
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="照片">
<ItemTemplate>
<asp:Image Runat=server ID="Image1" ImageUrl='<%# FormatURL(DataBinder.Eval(Container.DataItem, "PersonID")) %>' />
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>
<b>文件名字：</b><input id="MyFileName" type="text" runat="server" NAME="MyFileName">
<P>
<b>文件：</b><input id="MyFile" type="file" runat="server" NAME="MyFile">
<br/>
<br/>
<input type="submit" value="开始上传" runat="server" ID="Submit1" NAME="Submit1">
</P>
</form>
</body>
</HTML>

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.Web;
using System.IO;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace eMeng.Exam
{
/// <summary>
/// Image2Access 的摘要说明。
/// </summary>
public class Image2Access : System.Web.UI.Page
{
protected System.Web.UI.HtmlControls.HtmlInputText MyFileName;
protected System.Web.UI.HtmlControls.HtmlInputFile MyFile;
protected System.Web.UI.HtmlControls.HtmlInputButton Submit1;
protected System.Web.UI.WebControls.DataGrid DG_Persons;

private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
BindGrid();
}
private void BindGrid()
{
string strCnn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +Server.MapPath("Image2Access.mdb");
OleDbConnection myConnection = new OleDbConnection(strCnn);
OleDbCommand myCommand = new OleDbCommand("SELECT * FROM Person", myConnection);
myCommand.CommandType = CommandType.Text;
try
{
myConnection.Open();
DG_Persons.DataSource = myCommand.ExecuteReader(CommandBehavior.CloseConnection);
DG_Persons.DataBind();
}
catch(OleDbException SQLexc)
{
Response.Write("提取数据时出现错误：" + SQLexc.ToString());
}
}
protected string FormatURL(object strArgument)
{
return "ReadImage.aspx?id=" + strArgument.ToString();
}

#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Submit1.ServerClick += new System.EventHandler(this.Submit1_ServerClick);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

private void Submit1_ServerClick(object sender, System.EventArgs e)
{
//得到提交的文件
Stream fileDataStream = MyFile.PostedFile.InputStream;

//得到文件大小
int fileLength = MyFile.PostedFile.ContentLength;

//创建数组
byte[] fileData = new byte[fileLength];

//把文件流填充到数组
fileDataStream.Read(fileData,0,fileLength);

//得到文件名字
string fileTitle = MyFileName.Value;

//得到文件类型
string fileType = MyFile.PostedFile.ContentType;

//构建数据库连接，SQL语句，创建参数
string strCnn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("Image2Access.mdb");
OleDbConnection myConnection = new OleDbConnection(strCnn);
OleDbCommand command = new OleDbCommand ("INSERT INTO Person (PersonName,PersonEmail,PersonSex,PersonImageType,PersonImage)" +
"VALUES (@PersonName,@PersonEmail,@PersonSex,@PersonImageType,@PersonImage)", myConnection);

System.Data.OleDb.OleDbParameter paramPersonName = new OleDbParameter("@PersonName", System.Data.OleDb.OleDbType.VarChar,50);
paramPersonName.Value = fileTitle;
command.Parameters.Add(paramPersonName);

System.Data.OleDb.OleDbParameter paramPersonEmail = new OleDbParameter("@PersonEmail", System.Data.OleDb.OleDbType.VarChar,50);
paramPersonEmail.Value = "mengxianhui@dotnet.aspx.cc";
command.Parameters.Add(paramPersonEmail);

System.Data.OleDb.OleDbParameter paramPersonSex = new OleDbParameter("@paramPersonSex", System.Data.OleDb.OleDbType.VarChar,50);
paramPersonSex.Value = "男";
command.Parameters.Add(paramPersonSex);

System.Data.OleDb.OleDbParameter paramPersonImageType = new OleDbParameter("@PersonImageType", System.Data.OleDb.OleDbType.VarChar,50);
paramPersonImageType.Value = fileType;
command.Parameters.Add(paramPersonImageType);

System.Data.OleDb.OleDbParameter paramPersonImage = new OleDbParameter("@PersonImage", System.Data.OleDb.OleDbType.Binary);
paramPersonImage.Value = fileData;
command.Parameters.Add(paramPersonImage);

//打开连接，执行查询
myConnection.Open();
command.ExecuteNonQuery();
myConnection.Close();

}
}
}