All articles| All Pictures| All Softwares| All Video| Go home page| Write articles| Upload pictures

Reading number is top 10 articles
技巧:PHP+MYSQL动态网页编程纠错指南_php资料_编程技术
ASP.NET技巧:脚本获取选中文字及所在句子_.net资料_编程技术
实现XmlHttp跨域访问用ASP.NET后台代码_[Asp.Net教程]
偷懒秘笈之一键生成,Ajax,Control,Toolkit,标记_[Asp.Net教程]
delphi发展的历史
HTML 初学者指南(5)_[Html教程]
Asp.net,Socket,客户端(发送和接收数据,)_[Asp.Net教程]
ASP.NET程序错误“HTTP1.0,500,Server,Error”的一个解决办法
SQL Server2000安全管理机制详解_[SQL Server教程]
谈谈个人地方分类网站的推广和赢利_JavaScript技术_编程技术
Reading number is top 10 pictures
yy365网站上的美女1
青春清纯美女大集合2
初五接财神啦!五路财神齐来到
Beauty is thus produced
餐桌上的鱼
各种囧况!玩游戏最不喜欢出现的十件事
来几张有特色的图片
[猫扑大杂烩]华东师范墙上看到的捐精告示 15毫升3600元
这才是真正的人体艺术1
Household design of gorgeous series
Download software ranking
Tram sex maniac 2 (H) rar bag1
中国结婚习俗实录
Sora aoi's film--cangkong_Blue.Sky
实战黑客不求人
Boxer vs Yellow5
Eclipse-CALMSANNY (second edition)
Tram sex maniac 2 (H) rar bag11
Dance with duck(male prostitution)
Boxer's Top ten classic battle3
Proficient in JavaScript
delv published in(发表于) 2014/1/10 6:27:50 Edit(编辑)
ASP.NET如何存取SQL,Server数据库图_[Asp.Net教程]

ASP.NET如何存取SQL,Server数据库图_[Asp.Net教程]

ASP.NET如何存取SQL Server数据库图_[Asp.Net教程]

SQL Server提供了一个特别的数据类型:image,它是一个包含binary数据的类型。下边这个例子就向你展示了如何将文本或照片放入到数据库中的办法。在这篇文章中我们要看到如何在SQL Server中存储和读取图片。

  1、建立一个表:

  在SQL SERVER中建立这样结构的一个表:

列名 类型 目的
ID Integer 主键ID
imgTITLE Varchar(50) 图片的标题
imgTYPE Varchar(50) 图片类型. ASP.net要以辨认的类型
imgDATA Image 用于存储二进制数据

  2、存储图片到SQL SERVER数据库中

  为了能存储到表中,你首先要上传它们到你的Web 服务器上,你可以开发一个web form,它用来将客户端中TextBox web control中的图片入到你的WEB服务器上来。将你的 encType 属性设置为:myltipart/formdata.

Stream imgdatastream = File1.PostedFile.InputStream;
int imgdatalen = File1.PostedFile.ContentLength;
string imgtype = File1.PostedFile.ContentType;
string imgtitle = TextBox1.Text;
byte[] imgdata = new byte[imgdatalen];
int n = imgdatastream.Read(imgdata,0,imgdatalen);
string connstr=((NameValueCollection)Context.GetConfig("appSettings"))["connstr"];

SqlConnection connection = new SqlConnection(connstr);

SqlCommand command = new SqlCommand
         ("INSERT INTO ImageStore(imgtitle,imgtype,imgdata)
         VALUES ( @imgtitle, @imgtype,@imgdata )", connection );

SqlParameter paramTitle = new SqlParameter
         ("@imgtitle", SqlDbType.VarChar,50 );

paramTitle.Value = imgtitle;
command.Parameters.Add( paramTitle);

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

SqlParameter paramType = new SqlParameter( "@imgtype", SqlDbType.VarChar,50 );
paramType.Value = imgtype;
command.Parameters.Add( paramType );

connection.Open();
int numRowsAffected = command.ExecuteNonQuery();
connection.Close();

  3、从数据库中恢复读取

  现在让我们来从SQL Server中读取我们放入的数据吧!我们将要输出图片到你的浏览器上,你也可以将它存放到你要的位置。

private void Page_Load(object sender, System.EventArgs e)
{
 string imgid =Request.QueryString["imgid"];
 string connstr=((NameValueCollection)
 Context.GetConfig("appSettings"))["connstr"];
 string sql="SELECT imgdata, imgtype FROM ImageStore WHERE id = " + imgid;
 SqlConnection connection = new SqlConnection(connstr);
 SqlCommand command = new SqlCommand(sql, connection);
 connection.Open();
 SqlDataReader dr = command.ExecuteReader();
 if(dr.Read())
 {
  Response.ContentType = dr["imgtype"].ToString();
  Response.BinaryWrite( (byte[]) dr["imgdata"] );
 }
 connection.Close();
}

  要注意的是Response.BinaryWrite 而不是Response.Write.

  下面给大家一个用于C# Winform的存入、读取程序。其中不同请大家自己比较!(为了方便起见,我将数据库字段简化为二个:imgtitle和imgdata。

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

namespace WindowSAPplication21
{
 /// <summary>
 /// Form1 的摘要说明。
 /// </summary>
 public class Form1 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.Button button1;
  /// <summary>
  /// 必需的设计器变量。
  /// </summary>
  private System.ComponentModel.Container components = null;
  private string ConnectionString = "Integrated Security=SSPI;Initial Catalog=;Data Source=localhost;";
  private SqlConnection conn = null;
  private SqlCommand cmd = null;
  private System.Windows.Forms.Button button2;
  private System.Windows.Forms.PictureBox pic1;
  private System.Windows.Forms.OpenFileDialog openFileDialog1;
  private string sql = null;
  private System.Windows.Forms.Label label2;
  private string nowId=null;

 public Form1()
 {
  //
  // Windows 窗体设计器支持所必需的
  //
  InitializeComponent();
  conn = new SqlConnection(ConnectionString);

  //
  // TOD 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 )
 {
  if (conn.State == ConnectionState.Open)
   conn.Close();
  if( disposing )
  {
   if (components != null)
   {
    components.Dispose();
   }
  }
  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.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(344, 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;
  //
  // Form1
  //
  this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
  this.ClientSize = new System.Drawing.Size(632, 273);
  this.Controls.AddRange(new System.Windows.Forms.Control[] {
    this.label2,
    this.button2,
    this.pic1,
    this.button1});
  this.Name = "Form1";
  this.Text = "Form1";
  this.Load += new System.EventHandler(this.Form1_Load);
  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);


   if( conn.State == ConnectionState.Open)
    conn.Close();
   ConnectionString ="Integrated Security=SSPI;" + "Initial Catalog=mydb;" +"Data  Source=localhost;";
   conn.ConnectionString = ConnectionString;


 try
 {
  string mySelectQuery = "INSERT INTO ImageStore(imgtitle,imgdata) VALUES (@imgtitle, @imgdata )";
  //string mySelectQuery="UPDATE ImageStore set imgtitle=@imgtitle,imgdata=@imgdata" ;
  SqlCommand myCommand = new SqlCommand(mySelectQuery, conn);

  SqlParameter paramTitle = new SqlParameter("@imgtitle", SqlDbType.VarChar,50 );
  paramTitle.Value = imgtitle;
  myCommand.Parameters.Add( paramTitle);

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

  conn.Open();
  int numRowsAffected = myCommand.ExecuteNonQuery();
  conn.Close();
 }
 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 Form1_Load(object sender, System.EventArgs e)
 {
 }

 private void button2_Click(object sender, System.EventArgs e)
 {
  //打开数据库连接
  if( conn.State == ConnectionState.Open)
   conn.Close();
  ConnectionString ="Integrated Security=SSPI;" + "Initial Catalog=mydb;" +"Data Source=localhost;";
  conn.ConnectionString = ConnectionString;

  // 创建数据适配器
  string sql="SELECT * FROM ImageStore" ;
  SqlCommand command = new SqlCommand(sql, conn);
 
  try
  {conn.Open();}
  catch(Exception newerr)
  {
   MessageBox.Show(" 不能打开数据联接!") ;
  }
  finally
  {}

  SqlDataReader dr = command.ExecuteReader();
  if(dr.Read())
  {
   FileInfo fi = new FileInfo("temp");
   FileStream myStream=fi.Open(FileMode.Create);
   byte[] mydata=((byte[])dr["imgdata"]);
   //label2.Text="您现在看到的是:"+ dr["imgtitle"].ToString();
   foreach(byte a in mydata)
   {
    myStream.WriteByte(a);
   }
  myStream.Close();
  Image myImage=Image.FromFile("temp") ;
  pic1.Image=myImage;
  pic1.Refresh();
  dr.Close ();

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

 conn.Close();

}

}
}


来源:ASPCOOL







添加到del.icio.us 添加到新浪ViVi 添加到百度搜藏 添加到POCO网摘 添加到天天网摘365Key 添加到和讯网摘 添加到天极网摘 添加到黑米书签 添加到QQ书签 添加到雅虎收藏 添加到奇客发现 diigo it 添加到饭否 添加到飞豆订阅 添加到抓虾收藏 添加到鲜果订阅 digg it 貼到funP 添加到有道阅读 Live Favorites 添加到Newsvine 打印本页 用Email发送本页 在Facebook上分享


Disclaimer Privacy Policy About us Site Map

If you have any requirements, please contact webmaster。(如果有什么要求,请联系站长)
Copyright ©2011-
uuhomepage.com, Inc. All rights reserved.