数据库存取图片信息，有两种方式：

1)转换成二进制数据存储，故首先设置对应的数据字段数据类型为Blob.

2)服务器设置路径保存上传文件，数据库中只存储文件路径。

这里采用第一种方式简单示范如何存储并取出图片。涉及几个类的使用，已经做出简单注释。

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.IO;

using System.Data.OracleClient;//添加引用

namespace ImageDemo

{

public partial class Form1 : Form

{

OpenFileDialog filedialog;

string connstr = "";

public Form1()

{

connstr = "Data Source=xxx;user id=xxx;password=xxx";

InitializeComponent();

}

///

/// 获得要上传的文件

///

///

///

private void button2_Click(object sender, EventArgs e)

{

filedialog = new OpenFileDialog();

filedialog.FilterIndex = 1;

filedialog.Filter = "jpg files (*.jpg)|*.jpg|All files (*.*)|*.*";

if (filedialog.ShowDialog() == DialogResult.OK)

{

txtpath.Text = filedialog.FileName;

}

}

///

/// 上传到数据库中：往数据库存入图片信息

///

///

///

private void button1_Click(object sender, EventArgs e)

{

Cursor.Current = Cursors.WaitCursor;

//获得上传图片的二进制信息

byte[] buffer = File.ReadAllBytes(txtpath.Text.Trim());

Random rd = new Random();

string name = rd.Next(999).ToString();

string sql = "insert into ivan_qq_user(id,name,image) values('"+Guid.NewGuid().ToString()+"','"+name+"',:image)";

using (OracleConnection conn = new OracleConnection(connstr))

{

conn.Open();

OracleCommand cmd = new OracleCommand(sql, conn);

//指名参数类型为Blob

cmd.Parameters.Add(":image", OracleType.Blob);

cmd.Parameters[":image"].Value = buffer;

cmd.ExecuteNonQuery();

}

PreviewImage(name);

Cursor.Current = Cursors.Default;

MessageBox.Show("Done.....");

}

///

/// 预览图像信息：从数据库读图片信息

///

///

private void PreviewImage(string name)

{

ISDApp01.ISDApp01 isd = new ImageDemo.ISDApp01.ISDApp01();

string sql = "select image from IVAN_QQ_USER where name='"+name+"'";

using (OracleConnection conn = new OracleConnection(connstr))

{

conn.Open();

OracleCommand cmd = new OracleCommand(sql,conn);

//获得数据信息并转换成二进制

byte[] fileData = cmd.ExecuteScalar() as byte[];

MemoryStream ms = new MemoryStream(fileData);

//把二进制信息转换成image并show出

Image image = Image.FromStream(ms);

pictureBox1.Image = image;

}

}

}

}