我急需一个上传图片到access数据库和从access数据库读取出图片的例子,请帮帮我啊

ycc2008 2004-05-08 02:50:01
我急需一个上传图片到access数据库和从access数据库读取出图片的例子,请帮帮我啊,先谢谢了,我就20分了。。。
...全文
56 3 点赞 打赏 收藏 举报
写回复
3 条回复
切换为时间正序
当前发帖距今超过3年,不再开放新的回复
发表回复
ycc2008 2004-05-08
是winform的?晕
我自己改改吧,谢谢你们了
哈哈,现在0分了,过两天再来问下一个问题吧
  • 打赏
  • 举报
回复
wudixiaocaoren 2004-05-08
access 版



using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.IO;
using System.Data.OleDb;


namespace WindowsApplication21
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Button button1;
private System.ComponentModel.IContainer components;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.PictureBox pic1;
private System.Windows.Forms.OpenFileDialog openFileDialog1;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Label label2;


public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();


//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
base.Dispose( disposing );

}

#region Windows Form Designer generated code
/// <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.button1 = new System.Windows.Forms.Button();
this.pic1 = new System.Windows.Forms.PictureBox();
this.button2 = new System.Windows.Forms.Button();
this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
this.label2 = new System.Windows.Forms.Label();
this.textBox1 = new System.Windows.Forms.TextBox();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(0, 40);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(264, 48);
this.button1.TabIndex = 0;
this.button1.Text = "加入新的图片";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// pic1
//
this.pic1.Location = new System.Drawing.Point(280, 8);
this.pic1.Name = "pic1";
this.pic1.Size = new System.Drawing.Size(312, 264);
this.pic1.TabIndex = 3;
this.pic1.TabStop = false;
//
// button2
//
this.button2.Location = new System.Drawing.Point(0, 104);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(264, 40);
this.button2.TabIndex = 4;
this.button2.Text = "从数据库中恢复图像";
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// openFileDialog1
//
this.openFileDialog1.Filter = "\"图像文件(*.jpg,*.bmp,*.gif)|*.jpg|*.bmp|*.gif\"";
//
// label2
//
this.label2.Location = new System.Drawing.Point(0, 152);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(264, 48);
this.label2.TabIndex = 5;
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(96, 208);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(64, 21);
this.textBox1.TabIndex = 6;
this.textBox1.Text = "";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(616, 293);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.textBox1,
this.label2,
this.button2,
this.pic1,
this.button1});
this.Name = "Form1";
this.Text = "读取、写入图像到数据库中(黄海编制)";

this.ResumeLayout(false);

}
#endregion

/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}

private void button1_Click(object sender, System.EventArgs e)
{
openFileDialog1.ShowDialog ();

if (openFileDialog1.FileName.Trim()!="")
{
FileInfo fi = new FileInfo(openFileDialog1.FileName);
string imgtitle=openFileDialog1.FileName;
int imgdatalen=(int)fi.Length;
byte[] imgdata = new byte[imgdatalen];
Stream imgdatastream=fi.OpenRead();
int n=imgdatastream.Read(imgdata,0,imgdatalen);
string strCon="Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+Application.StartupPath+"\\mydb.mdb";
OleDbConnection conn = new OleDbConnection ( strCon ) ;



try
{
string mySelectQuery = "INSERT INTO ImageStore(imgdata) VALUES (@imgdata )";

OleDbCommand myCommand = new OleDbCommand(mySelectQuery, conn);

OleDbParameter paramData = new OleDbParameter( "@imgdata", SqlDbType.Image );
paramData.Value = imgdata;
myCommand.Parameters.Add( paramData );

conn.Open();
int numRowsAffected = myCommand.ExecuteNonQuery();
conn.Close();

MessageBox.Show("成功放入图片到数据库中");
}
catch(Exception err)
{
MessageBox.Show("您输入名称可能在数据库中已存在或输入为空,请检查!"+err.ToString() );
}
finally
{}


}

}


private void button2_Click(object sender, System.EventArgs e)
{
string strCon="Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+Application.StartupPath+"\\mydb.mdb";
OleDbConnection conn = new OleDbConnection ( strCon ) ;
if(textBox1.Text.Trim()=="") MessageBox.Show("显示不能为空!");
else
{
string sql="SELECT * FROM ImageStore where id="+textBox1.Text.Trim() ;
OleDbCommand command = new OleDbCommand(sql, conn);
try
{
conn.Open();
}
catch
{
MessageBox.Show(" 不能打开数据联接!") ;
}


OleDbDataReader dr = command.ExecuteReader();

if(dr.Read())
{

byte[] mydata=((byte[])dr["imgdata"]);
MemoryStream myStream=new MemoryStream();
foreach(byte a in mydata)
{
myStream.WriteByte(a);
}
Image myImage=Image.FromStream(myStream);
myStream.Close();
pic1.Image=myImage;
pic1.Refresh();


}
else
{
MessageBox.Show("没有成功读入数据!") ;

}

conn.Close();

}
}






}

}


  • 打赏
  • 举报
回复
scocsdn 2004-05-08
http://dotnet.aspx.cc/ShowDetail.aspx?id=EY1XLDYV-PIDF-43LO-1WFL-FMY5ALE1F635
  • 打赏
  • 举报
回复
相关推荐
发帖
.NET社区
加入

5.9w+

社区成员

.NET技术交流专区
申请成为版主
帖子事件
创建了帖子
2004-05-08 02:50
社区公告
暂无公告