图片的二进制数据库存储和显示

GridView控件 Image控件 与图片的二进制数据库存储和显示

1.将图片以二进制存入数据库
2.读取二进制图片在页面显示
3.设置Image控件显示从数据库中读出的二进制图片
4.GridView中ImageField以URL方式显示图片
5.GridView显示读出的二进制图片
====================

1.将图片以二进制存入数据库
--------------------------
//保存图片到数据库

protected void Button1_Click(object sender, EventArgs e)
{
    //图片路径
    string strPath = "~/photo/03.JPG";
    string strPhotoPath = Server.MapPath(strPath);

     ////////////这里的Server.MapPath()就是将上传的图片保存到***地址/////////////////
    //读取图片
    FileStream fs = new System.IO.FileStream(strPhotoPath, FileMode.Open, FileAccess.Read);
    BinaryReader br = new BinaryReader(fs); 
    byte[] photo = br.ReadBytes((int)fs.Length); 
    br.Close(); 
    fs.Close(); 
    //存入
    SqlConnection myConn = new SqlConnection("Data Source=127.0.0.1;Initial Catalog=TestDB;User ID=sa;Password=sa");
    string strComm = " INSERT INTO personPhoto(personName, personPhotoPath, personPhoto) ";
    strComm += " VALUES('wangwu', '" + strPath + "', @photoBinary )";
    SqlCommand myComm = new SqlCommand(strComm, myConn);
    myComm.Parameters.Add("@photoBinary", SqlDbType.Binary,photo.Length);
    myComm.Parameters["@photoBinary"].Value = photo;
    myConn.Open();
    myComm.ExecuteNonQuery();
    myConn.Close();
}

2.读取二进制图片在页面显示
--------------------------
//读取图片
SqlConnection myConn = new SqlConnection("Data Source=127.0.0.1;Initial Catalog=TestDB;User ID=sa;Password=sa");
string strComm = " SELECT personPhoto FROM personPhoto WHERE personName='wangwu' ";
SqlCommand myComm = new SqlCommand(strComm, myConn);
myConn.Open();
SqlDataReader dr = myComm.ExecuteReader();
while (dr.Read())
{
    byte[] photo = (byte[])dr["personPhoto"];
    this.Response.BinaryWrite(photo);
}
dr.Close();
myConn.Close();

或

SqlConnection myConn = new SqlConnection("Data Source=127.0.0.1;Initial Catalog=TestDB;User ID=sa;Password=sa");
SqlDataAdapter myda = new SqlDataAdapter(" SELECT personPhoto FROM personPhoto WHERE personName='wangwu' ", myConn);
DataSet myds = new DataSet();
myConn.Open();
myda.Fill(myds);
myConn.Close();
//
byte[] photo = (byte[])myds.Tables[0].Rows[0]["personPhoto"];
this.Response.BinaryWrite(photo);

3.设置Image控件显示从数据库中读出的二进制图片
---------------------------------------------
SqlConnection myConn = new SqlConnection("Data Source=192.168.0.36;Initial Catalog=TestDB;User ID=sa;Password=sa");
SqlDataAdapter myda = new SqlDataAdapter(" SELECT personPhoto FROM personPhoto WHERE personName='wangwu' ", myConn);
DataSet myds = new DataSet();
myConn.Open();
myda.Fill(myds);
myConn.Close();
//
byte[] photo = (byte[])myds.Tables[0].Rows[0]["personPhoto"];
//图片路径
string strPath = "~/photo/wangwu.JPG";
string strPhotoPath = Server.MapPath(strPath);
//保存图片文件
BinaryWriter bw = new BinaryWriter(File.Open(strPhotoPath,FileMode.OpenOrCreate));
bw.Write(photo);
bw.Close();
//显示图片
this.Image1.ImageUrl = strPath;

4.GridView中ImageField以URL方式显示图片
----------------------------
"GridView1" runat="server" AutoGenerateColumns="False">
    
        "personName" HeaderText="姓名" />
        "personPhotoPath" 
            HeaderText="图片">
        
    

后台直接绑定即可

5.GridView显示读出的二进制图片
------------------------------
//样板列
"GridView1" runat="server" AutoGenerateColumns="False" OnRowDataBound="GridView1_RowDataBound">
    
        "personName" HeaderText="姓名" />
        "personPhotoPath" 
            HeaderText="图片">
        
        "图片">
            
                "Image1" runat="server" />
            
        
    


//绑定
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowIndex < 0)
        return;
    // System.ComponentModel.Container
    string strPersonName = (string)DataBinder.Eval(e.Row.DataItem, "personName");
    Image tmp_Image = (Image)e.Row.Cells[2].FindControl("Image1");
    if (!System.Convert.IsDBNull(DataBinder.Eval(e.Row.DataItem, "personPhoto")))
    {
        //
        byte[] photo = (byte[])DataBinder.Eval(e.Row.DataItem, "personPhoto");
        //图片路径
        string strPath = "~/photo/" + strPersonName.Trim() + ".JPG";
        string strPhotoPath = Server.MapPath(strPath);
        //保存图片文件
        BinaryWriter bw = new BinaryWriter(File.Open(strPhotoPath, FileMode.OpenOrCreate));
        bw.Write(photo);
        bw.Close();
        //显示图片
        tmp_Image.ImageUrl = strPath;
    }    
}

***************************
#region 相册Grid按钮事件 
protected void gv_PhotoInfo_RowCommand(object sender, GridViewCommandEventArgs e) 
{ 
GridViewRow currRow = (GridViewRow)((Button)e.CommandSource).Parent.Parent; 
string strPhotoID = currRow.Cells[0].Text.ToString(); 
string strPhotoName = currRow.Cells[1].Text.ToString(); 
if (e.CommandName == "btn_Edit")//照片属性修改 
{ 
Response.Redirect("PhotoEdit.aspx?PhotoID=" + strPhotoID + "&PhotoName=" + strPhotoName); 
} 
else if (e.CommandName == "btn_Detail")//照片内容查看 
{ 
this.img1.Src = "PhotoShow.aspx?PhotoID=" + strPhotoID; 
this.img1.Visible = true; 
} 
else if (e.CommandName == "btn_Delete")//照片删除 
{ 

} 
} 
#endregion
PhotoShow.aspx页面 
=============== 
using System; 
using System.Data; 
using System.Configuration; 
using System.Collections; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 
using System.Data.SqlClient; 
using System.IO; 

public partial class PhotoShow : System.Web.UI.Page 
{ 
protected void Page_Load(object sender, EventArgs e) 
{ 
try 
{ 
#region 原图 
//int intPhotoID = Convert.ToInt32(Request.QueryString["PhotoID"].Trim()); 
//string strSql = " SELECT PhotoContent FROM PhotoInfo "; 
//strSql += " WHERE PhotoID = " + intPhotoID + " "; 
//DataTable dt = DBClass.RunSelectGetDataTable(strSql); 
//byte[] photo = (byte[])dt.Rows[0]["PhotoContent"]; 
//this.Response.BinaryWrite(photo); 
#endregion 

#region 规定宽高的图 
//int intPhotoID = Convert.ToInt32(Request.QueryString["PhotoID"].Trim()); 
int intPhotoID = 1; 
//int intHeight = Request.QueryString["PhotoHeight"].Trim(); 
int intHeight = 500; 
//int intWidth = Request.QueryString["PhotoWidth"].Trim(); 
int intWidth =500; 

string strSql = " SELECT PhotoContent FROM PhotoInfo "; 
strSql += " WHERE PhotoID = " + intPhotoID + " "; 
DataTable dt = DBClass.RunSelectGetDataTable(strSql); 
byte[] photo = (byte[])dt.Rows[0]["PhotoContent"]; 
//this.Response.BinaryWrite(photo); 
System.IO.MemoryStream ms = new MemoryStream(photo); 
System.Drawing.Image img = System.Drawing.Image.FromStream(ms); 
System.Drawing.Image newImg = img.GetThumbnailImage(intWidth, intHeight, null, new System.IntPtr()); 
newImg.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif); 
#endregion 
} 
catch(Exception ex) 
{ 

} 
} 
}
*************************
#region 上传 按钮 事件 
protected void btn_Upload_Click(object sender, EventArgs e) 
{ 
using (SqlConnection sqlConn = new SqlConnection(DBClass.DBConnString())) 
{ 
sqlConn.Open(); 
int intImageSize; 
string strImageType; 
Stream ImageStream; 

intImageSize = this.FileUpload1.PostedFile.ContentLength; 
ImageStream = this.FileUpload1.PostedFile.InputStream; 
strImageType = this.FileUpload1.PostedFile.ContentType; 
Byte[] ImageContent = new Byte[intImageSize]; 
int intStatus; 
intStatus = ImageStream.Read(ImageContent, 0, intImageSize); 

String strSql = "INSERT INTO PhotoInfo( AlbumID, PhotoName, PhotoType "; 
strSql += " , PhotoContent, PhotoByteSize, PhotoNote )"; 
strSql += " VALUES( '" + Request.QueryString["AlbumID"].Trim() + "' "; 
strSql += " ,'" + this.txt_PhotoName.Text.Trim() + "' "; 
strSql += " ,'" + this.FileUpload1.PostedFile.ContentType + "' "; 
strSql += " ,@photoBinary "; 
strSql += " ," + this.FileUpload1.PostedFile.ContentLength + " "; 
strSql += " ,'" + this.txt_PhotoNote.Text.Trim() + "' "; 
strSql += " ) "; 

SqlCommand sqlComm = new SqlCommand(strSql, sqlConn); 
sqlComm.Parameters.Add("@photoBinary", SqlDbType.Image, intImageSize); 
sqlComm.Parameters["@photoBinary"].Value = ImageContent; 

sqlComm.ExecuteNonQuery(); 
sqlConn.Close(); 
} 
CommonHelper.DoAlert(this.Page, "上传成功"); 
this.txt_PhotoName.Text = ""; 
this.txt_PhotoNote.Text = ""; 

} 
#endregion