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C# SQL server2000中保存的图像

2008-03-18 14:59 555 查看

//将SQL server2000中保存的图像显示在Picture中
private void listBox1_SelectedIndexChanged(object sender, System.EventArgs e)
{
byte[] buffByte = null;
string comm = @"select img from table1 where id = " + this.listBox1.SelectedValue ;
this.sqlCommand1 = new System.Data.SqlClient.SqlCommand ();
this.sqlCommand1.CommandType = System.Data.CommandType.Text ;
this.sqlCommand1.CommandText = comm;
this.sqlCommand1.Connection = this.sqlConnection1 ;
this.sqlConnection1.Open();
System.Data.SqlClient.SqlDataReader rd = this.sqlCommand1.ExecuteReader();
while (rd.Read())
{
buffByte = ((byte[])rd[0]);
}
rd.Close();
this.sqlConnection1.Close();
//将图像的字节数组放入内存流
System.IO.MemoryStream ms = new System.IO.MemoryStream(buffByte);
//通过流对象建立Bitmap
System.Drawing.Bitmap bmp = new Bitmap(ms);
this.pictureBox1.Image = bmp;
}

//将图像保存到SQL server2000的Image字段中
private void button2_Click_1(object sender, System.EventArgs e)
{
string pathName;
if (this.openFileDialog1.ShowDialog()==System.Windows.Forms.DialogResult.OK)
{
pathName = this.openFileDialog1.FileName;
System.Drawing.Image img = System.Drawing.Image.FromFile(pathName);
this.pictureBox1.Image = img;

//将图像读入到字节数组
System.IO.FileStream fs = new System.IO.FileStream(pathName,System.IO.FileMode.Open,System.IO.FileAccess.Read);
byte[] buffByte = new byte[fs.Length];
fs.Read(buffByte,0,(int)fs.Length);
fs.Close();
fs = null;

//建立Command命令
string comm = @"Insert into table1(img,name) values(@img,@name)";
this.sqlCommand1 = new System.Data.SqlClient.SqlCommand ();
this.sqlCommand1.CommandType = System.Data.CommandType.Text ;
this.sqlCommand1.CommandText = comm;
this.sqlCommand1.Connection = this.sqlConnection1 ;
//创建Parameter
this.sqlCommand1.Parameters.Add("@img",System.Data.SqlDbType.Image);
this.sqlCommand1.Parameters[0].Value = buffByte;
this.sqlCommand1.Parameters.Add("@name",System.Data.SqlDbType.VarChar);
this.sqlCommand1.Parameters[1].Value =pathName.Substring(pathName.LastIndexOf("\\")+1);
try
{
this.sqlConnection1.Open();
this.sqlCommand1.ExecuteNonQuery();
this.sqlConnection1.Close();
}
catch(System.Exception ee)
{
MessageBox.Show(ee.Message );
}
buffByte = null;
this.FillListBox();
}
}

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