(基于mysql的Java毕业设计)在线错题管理系统(源码).rar

//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(); } }