.Net在SqlServer中的圖片存取技術(shù)
發(fā)表時(shí)間:2024-06-18 來(lái)源:明輝站整理相關(guān)軟件相關(guān)文章人氣:
[摘要]本文總結(jié)如何在.Net Winform和.Net webform(asp.net)中將圖片存入sqlserver中并讀取顯示的方法1,使用asp.net將圖片上傳并存入SqlServer中,然后從SqlServer中讀取并顯示出來(lái)一,上傳并存入SqlServer 數(shù)據(jù)庫(kù)結(jié)構(gòu) create tab...
本文總結(jié)如何在.Net Winform和.Net webform(asp.net)中將圖片存入sqlserver中并讀取顯示的方法
1,使用asp.net將圖片上傳并存入SqlServer中,然后從SqlServer中讀取并顯示出來(lái)
一,上傳并存入SqlServer
數(shù)據(jù)庫(kù)結(jié)構(gòu)
create table test
{
id identity(1,1),
FImage image
}
相關(guān)的存儲(chǔ)過(guò)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="上傳"></asp:Button>
然后在后置代碼文件UpPhoto.aspx.cs添加btnAdd按鈕的單擊事件處理代碼:
private void btnAdd_Click(object sender, System.EventArgs e)
{
//獲得圖象并把圖象轉(zhuǎn)換為byte[]
HttpPostedFile upPhoto=UpPhoto.PostedFile;
int upPhotoLength=upPhoto.ContentLength;
byte[] PhotoArray=new Byte[upPhotoLength];
Stream PhotoStream=upPhoto.InputStream;
PhotoStream.Read(PhotoArray,0,upPhotoLength);
//連接數(shù)據(jù)庫(kù)
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儲(chǔ)過(guò)程來(lái)添加圖片把上面四句代碼改為:
//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,從SqlServer中讀取并顯示出來(lái)
在需要顯示圖片的地方添加如下代碼:
<asp:image id="imgPhoto" runat="server" ImageUrl="ShowPhoto.aspx"></asp:image>
ShowPhoto.aspx主體代碼:
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";//這里假設(shè)獲取id為2的圖片
SqlCommand cmd=new SqlCommand()
reader.Read();
Response.ContentType="application/octet-stream";
Response.BinaryWrite((Byte[])reader["FImage"]);
Response.End();
reader.Close();
}
}
3,在winform中將圖片存入sqlserver,并從sqlserver中讀取并顯示在picturebox中
1,存入sqlserver
數(shù)據(jù)庫(kù)結(jié)構(gòu)和使用的存儲(chǔ)過(guò)過(guò)程,同上面的一樣
1.1,在窗體中加一個(gè)OpenFileDialog控件,命名為ofdSelectPic
1.2,在窗體上添加一個(gè)打開(kāi)文件按鈕,添加如下單擊事件代碼:
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("讀取完畢!");
//連接數(shù)據(jù)庫(kù)
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,讀取并顯示在picturebox中
2.1 添加一個(gè)picturebox,名為ptbShow
2.2 添加一個(gè)按鈕,添加如下響應(yīng)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=i