.net 图片的二进制数据库存储和显示
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
====================
用到的知识点：
FileSteam fs=new FileSteam(fileName,FileMode.Open,FileAccess.Read);
BinaryReader binaryReader=new BinaryReader(fs);
byte[] myByte=new byte[fs.length];
binaryReader.Read(myByte,0,Convet.ToInt32(fs.Length));
fs.close()
FileInfo fl=new FileInfo(fileName);
string imgName=fl.name;
Memorystream ms=new MemoryStream();
byte[] imgByte=(byte[])rd.GetValue(0);
Stream imgStream=new MemoryStream(imgByte);
pb.Image=Image.FromStream(imgStream);
DataView dv=(DataView)cmb.SelectedItem;
string imgId=dv.Row["id"].ToString();
============================
1.将图片以二进制存入数据库
C#
--------------------------
//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);
//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();
}
VB.NET
'保存图片到数据库
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs)
'图片路径
Dim strPath As String = "~/photo/03.JPG"
Dim strPhotoPath As String = Server.MapPath(strPath)
'读取图片
Dim fs As FileStream = New System.IO.FileStream(strPhotoPath, FileMode.Open, FileAccess.Read)
Dim br As BinaryReader = New BinaryReader(fs)
Dim photo() As Byte = br.ReadBytes(CType(fs.Length,Integer))
br.Close
fs.Close
'存入
Dim myConn As SqlConnection = New SqlConnection("Data Source=127.0.0.1;Initial Catalog=TestDB;User ID=sa;Password=sa")
Dim strComm As String = " INSERT INTO personPhoto(personName, personPhotoPath, personPhoto) "
strComm = (strComm + (" VALUES('wangwu', '" _
+ (strPath + "', @photoBinary )")))
Dim myComm As SqlCommand = New SqlCommand(strComm, myConn)
myComm.Parameters.Add("@photoBinary", SqlDbType.Binary, photo.Length)
myComm.Parameters("@photoBinary").Value = photo
myConn.Open
myComm.ExecuteNonQuery
myConn.Close
End Sub
2.读取二进制图片在页面显示
C#
--------------------------
//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);
VB.NET
Dim myConn As SqlConnection = New SqlConnection("Data Source=127.0.0.1;Initial Catalog=TestDB;User ID=sa;Password=sa")
Dim strComm As String = " SELECT personPhoto FROM personPhoto WHERE personName='wangwu' "
Dim myComm As SqlCommand = New SqlCommand(strComm, myConn)
myConn.Open
Dim dr As SqlDataReader = myComm.ExecuteReader
While dr.Read
Dim photo() As Byte = CType(dr("personPhoto"),Byte())
Me.Response.BinaryWrite(photo)
End While
dr.Close
myConn.Close
或
Dim myConn As SqlConnection = New SqlConnection("Data Source=127.0.0.1;Initial Catalog=TestDB;User ID=sa;Password=sa")
Dim myda As SqlDataAdapter = New SqlDataAdapter(" SELECT personPhoto FROM personPhoto WHERE personName='wangwu' ", myConn)
Dim myds As DataSet = New DataSet
myConn.Open
myda.Fill(myds)
myConn.Close
Dim photo() As Byte = CType(myds.Tables(0).Rows(0)("personPhoto"),Byte())
Me.Response.BinaryWrite(photo)
3.设置Image控件显示从数据库中读出的二进制图片
C#
---------------------------------------------
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;
VB.NET
Dim myConn As SqlConnection = New SqlConnection("Data Source=192.168.0.36;Initial Catalog=TestDB;User ID=sa;Password=sa")
Dim myda As SqlDataAdapter = New SqlDataAdapter(" SELECT personPhoto FROM personPhoto WHERE personName='wangwu' ", myConn)
Dim myds As DataSet = New DataSet
myConn.Open
myda.Fill(myds)
myConn.Close
Dim photo() As Byte = CType(myds.Tables(0).Rows(0)("personPhoto"),Byte())
Dim strPath As String = "~/photo/wangwu.JPG"
Dim strPhotoPath As String = Server.MapPath(strPath)
Dim bw As BinaryWriter = New BinaryWriter(File.Open(strPhotoPath, FileMode.OpenOrCreate))
bw.Write(photo)
bw.Close
'显示图片
Me.Image1.ImageUrl = strPath
4.GridView中ImageField以URL方式显示图片
----------------------------
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:BoundField DataField="personName" HeaderText="姓名" />
<asp:ImageField DataImageUrlField="personPhotoPath"
HeaderText="图片">
</asp:ImageField>
</Columns>
</asp:GridView>
后台直接绑定即可
5.GridView显示读出的二进制图片
------------------------------
//样板列
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowDataBound="GridView1_RowDataBound">
<Columns>
<asp:BoundField DataField="personName" HeaderText="姓名" />
<asp:ImageField DataImageUrlField="personPhotoPath"
HeaderText="图片">
</asp:ImageField>
<asp:TemplateField HeaderText="图片">
<ItemTemplate>
<asp:Image ID="Image1" runat="server" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
//绑定
C#
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;
}
}
VB.NET
Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
If (e.Row.RowIndex < 0) Then
Return
End If
' System.ComponentModel.Container
Dim strPersonName As String = CType(DataBinder.Eval(e.Row.DataItem, "personName"),String)
Dim tmp_Image As Image = CType(e.Row.Cells(2).FindControl("Image1"),Image)
If Not System.Convert.IsDBNull(DataBinder.Eval(e.Row.DataItem, "personPhoto")) Then
'
Dim photo() As Byte = CType(DataBinder.Eval(e.Row.DataItem, "personPhoto"),Byte())
'G
Dim strPath As String = ("~/photo/" _
+ (strPersonName.Trim + ".JPG"))
Dim strPhotoPath As String = Server.MapPath(strPath)
'XG
Dim bw As BinaryWriter = New BinaryWriter(File.Open(strPhotoPath, FileMode.OpenOrCreate))
bw.Write(photo)
bw.Close
'>:G
tmp_Image.ImageUrl = strPath
End If
End Sub