.net 图片的二进制数据库存储和显示

.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