图片导入导出数据库

private Stream stream=new Stream();
Bitmap bp=new Bitmap();
/// <summary>
/// 向数据库中导入图片
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog of = new OpenFileDialog();
if (of.ShowDialog() == DialogResult.OK)
{
bp = new Bitmap(of.FileName);
stream=of.OpenFile();//2下面
}
string sql = "update h_doctor set xiangPian=?xiangpian where ID="+12;
using (MySqlConnection conn = new MySqlConnection(mysqlHelp.ConnectionString))
{
MySqlCommand cmd = new MySqlCommand(sql, conn);
byte[] bytes = new byte[stream.Length];
stream.Read(bytes, 0, (int)stream.Length);
cmd.Parameters.AddWithValue("?xiangpian", bytes);
try
{
conn.Open();
cmd.ExecuteNonQuery();
pictureBox1.Image = bp;
}
catch (Exception e1)
{
MessageBox.Show("图片太大！图片支持20K以内");
}
finally
{
conn.Close();
}

}

}
/// <summary>
/// 图片导出
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button2_Click(object sender, EventArgs e)
{
string sql = "select xiangpian from h_doctor where ID=" + 12;
using (MySqlConnection conn = new MySqlConnection(mysqlHelp.ConnectionString))
{
MySqlCommand cmd = new MySqlCommand(sql, conn);
conn.Open();
MySqlDataReader read = cmd.ExecuteReader();
if (read.Read())
{
if (read[0].GetType() != typeof(DBNull))
{
byte[] bs = (byte[])read[0];
MemoryStream mem = new MemoryStream(bs);
Bitmap bm = new Bitmap(mem);
pictureBox1.Image = bm;
}
}
}
}

2、 FileStream fs = File.OpenRead(of.FileName));
byte[] imageb = new byte[fs.Length];
fs.Read(imageb, 0, imageb.Length);
fs.Close();
SqlCommand com3 = new SqlCommand (sql,con);
com3.Parameters.Add("@images", SqlDbType.Image).Value = imageb;