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使用asp.net将图片上传并存入SqlServer中,然后从SqlServer中读取并显示出来

2024-07-10 13:06:39
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1,使用asp.net将图片上传并存入sqlserver中,然后从sqlserver中读取并显示出来
一,上传并存入sqlserver
 数据库结构
  create table test
  {
     id identity(1,1),
     fimage image
  }
  相关的存储过程
  create proc updateimage
  (
     @updateimage image
  )
  as
  insert into test(fimage) values(@updateimage)
  go
在upphoto.aspx文件中添加如下:
<input id="upphoto" name="upphoto" runat="server" type="file">
<asp:button id="btnadd" name="btnadd" runat="server" text="上传"></asp:button>

然后在后置代码文件upphoto.aspx.cs添加btnadd按钮的单击事件处理代码:
private void btnadd_click(object sender, system.eventargs e)
{
        //获得图象并把图象转换为byte[]
        httppostedfile upphoto=upphoto.postedfile;
        int upphotolength=upphoto.contentlength;
        byte[] photoarray=new byte[upphotolength];
        stream photostream=upphoto.inputstream;
        photostream.read(photoarray,0,upphotolength);

        //连接数据库
        sqlconnection conn=new sqlconnection();
        conn.connectionstring="data source=localhost;database=test;user id=sa;pwd=sa";

        sqlcommand cmd=new sqlcommand("updateimage",conn);
        cmd.commandtype=commandtype.storedprocedure;

        cmd.parameters.add("@updateimage",sqldbtype.image);
        cmd.parameters["@updateimage"].value=photoarray;

        //如果你希望不使用存储过程来添加图片把上面四句代码改为:
        //string strsql="insert into test(fimage) values(@fimage)";
        //sqlcommand cmd=new sqlcommand(strsql,conn);
        //cmd.parameters.add("@fimage",sqldbtype.image);
        //cmd.parameters["@fimage"].value=photoarray;

 conn.open();
 cmd.executenonquery();
 conn.close();
}

二,从sqlserver中读取并显示出来
在需要显示图片的地方添加如下代码:
<asp:image id="imgphoto" runat="server" imageurl="showphoto.aspx"></asp:image>

showphoto.aspx主体代码:
private void page_load(object sender, system.eventargs e)
{
     if(!page.ispostback)
     {
                sqlconnection conn=new sqlconnection()
                conn.connectionstring="data source=localhost;database=test;user id=sa;pwd=sa";
               
                string strsql="select * from test where id=2";//这里假设获取id为2的图片
                sqlcommand cmd=new sqlcommand()
                reader.read();
                response.contenttype="application/octet-stream";
                response.binarywrite((byte[])reader["fimage"]);
                response.end();
                reader.close();
     }
}


3,在winform中将图片存入sqlserver,并从sqlserver中读取并显示在picturebox中

1,存入sqlserver
数据库结构和使用的存储过过程,同上面的一样
 1.1,在窗体中加一个openfiledialog控件,命名为ofdselectpic
 1.2,在窗体上添加一个打开文件按钮,添加如下单击事件代码:
    stream ms;
  byte[] picbyte;
  //ofdselectpic.showdialog();
  if (ofdselectpic.showdialog()==dialogresult.ok)
  {
   if ((ms=ofdselectpic.openfile())!=null)
   {
    //messagebox.show("ok");
    picbyte=new byte[ms.length];
    ms.position=0;
    ms.read(picbyte,0,convert.toint32(ms.length));
    //messagebox.show("读取完毕!");

    //连接数据库
    sqlconnection conn=new sqlconnection();
    conn.connectionstring="data source=localhost;database=test;user id=sa;pwd=sa";

    sqlcommand cmd=new sqlcommand("updateimage",conn);
    cmd.commandtype=commandtype.storedprocedure;

    cmd.parameters.add("@updateimage",sqldbtype.image);
    cmd.parameters["@updateimage"].value=picbyte;

    conn.open();
    cmd.executenonquery();
    conn.close();

    ms.close();
    }
   }

2,读取并显示在picturebox中
 2.1 添加一个picturebox,名为ptbshow
 2.2 添加一个按钮,添加如下响应事件:
      sqlconnection conn=new sqlconnection();
 conn.connectionstring="data source=localhost;database=test;user id=sa;pwd=sa";

 string strsql="select fimage from test where id=1";

 sqlcommand cmd=new sqlcommand(strsql,conn);

 conn.open();
 sqldatareader reader=cmd.executereader();
        reader.read();

 memorystream ms=new memorystream((byte[])reader["fimage"]);


 image image=image.fromstream(ms,true);

        reader.close();
        conn.close();

 ptbshow.image=image;


在upphoto.aspx文件中添加如下:
<input id="upphoto" name="upphoto" runat="server" type="file">
<asp:button id="btnadd" name="btnadd" runat="server" text="上传"></asp:button>

然后在后置代码文件upphoto.aspx.cs添加btnadd按钮的单击事件处理代码:
private void btnadd_click(object sender, system.eventargs e)
{
        //获得图象并把图象转换为byte[]
        httppostedfile upphoto=upphoto.postedfile;
        int upphotolength=upphoto.contentlength;
        byte[] photoarray=new byte[upphotolength];
        stream photostream=upphoto.inputstream;
        photostream.read(photoarray,0,upphotolength);

        //连接数据库
        sqlconnection conn=new sqlconnection();
        conn.connectionstring="data source=localhost;database=test;user id=sa;pwd=sa";

        sqlcommand cmd=new sqlcommand("updateimage",conn);
        cmd.commandtype=commandtype.storedprocedure;

        cmd.parameters.add("@updateimage",sqldbtype.image);
        cmd.parameters["@updateimage"].value=photoarray;

        //如果你希望不使用存储过程来添加图片把上面四句代码改为:
        //string strsql="insert into test(fimage) values(@fimage)";
        //sqlcommand cmd=new sqlcommand(strsql,conn);
        //cmd.parameters.add("@fimage",sqldbtype.image);
        //cmd.parameters["@fimage"].value=photoarray;

 conn.open();
 cmd.executenonquery();
 conn.close();
}

二,从sqlserver中读取并显示出来
在需要显示图片的地方添加如下代码:
<asp:image id="imgphoto" runat="server" imageurl="showphoto.aspx"></asp:image>

showphoto.aspx主体代码:
private void page_load(object sender, system.eventargs e)
{
     if(!page.ispostback)
     {
                sqlconnection conn=new sqlconnection()
                conn.connectionstring="data source=localhost;database=test;user id=sa;pwd=sa";
               
                string strsql="select * from test where id=2";//这里假设获取id为2的图片
                sqlcommand cmd=new sqlcommand()
                reader.read();
                response.contenttype="application/octet-stream";
                response.binarywrite((byte[])reader["fimage"]);
                response.end();
                reader.close();
     }
}


3,在winform中将图片存入sqlserver,并从sqlserver中读取并显示在picturebox中

1,存入sqlserver
数据库结构和使用的存储过过程,同上面的一样
 1.1,在窗体中加一个openfiledialog控件,命名为ofdselectpic
 1.2,在窗体上添加一个打开文件按钮,添加如下单击事件代码:
    stream ms;
  byte[] picbyte;
  //ofdselectpic.showdialog();
  if (ofdselectpic.showdialog()==dialogresult.ok)
  {
   if ((ms=ofdselectpic.openfile())!=null)
   {
    //messagebox.show("ok");
    picbyte=new byte[ms.length];
    ms.position=0;
    ms.read(picbyte,0,convert.toint32(ms.length));
    //messagebox.show("读取完毕!");

    //连接数据库
    sqlconnection conn=new sqlconnection();
    conn.connectionstring="data source=localhost;database=test;user id=sa;pwd=sa";

    sqlcommand cmd=new sqlcommand("updateimage",conn);
    cmd.commandtype=commandtype.storedprocedure;

    cmd.parameters.add("@updateimage",sqldbtype.image);
    cmd.parameters["@updateimage"].value=picbyte;

    conn.open();
    cmd.executenonquery();
    conn.close();

    ms.close();
    }
   }

2,读取并显示在picturebox中
 2.1 添加一个picturebox,名为ptbshow
 2.2 添加一个按钮,添加如下响应事件:
      sqlconnection conn=new sqlconnection();
 conn.connectionstring="data source=localhost;database=test;user id=sa;pwd=sa";

 string strsql="select fimage from test where id=1";

 sqlcommand cmd=new sqlcommand(strsql,conn);

 conn.open();
 sqldatareader reader=cmd.executereader();
        reader.read();

 memorystream ms=new memorystream((byte[])reader["fimage"]);


 image image=image.fromstream(ms,true);

        reader.close();
        conn.close();

 ptbshow.image=image;

 

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