字符串注入攻击

                //查询编号和名称（必须一致才能获取）

                Console.Write("请输入编号");
                string ids = Console.ReadLine();
                Console.Write("请输入名称");
                string name = Console.ReadLine();


                string str = "server=.;database=mydb;user=sa;pwd=123";
                SqlConnection conn = new SqlConnection(str);

                SqlCommand cmd = conn.CreateCommand();
                cmd.CommandText = "select * from fruit where    name='"+name+"' and ids='"+ids+"'";//字符串拼接容易被攻击

                conn.Open();
                SqlDataReader dr = cmd.ExecuteReader();

                while (dr.Read())
                {
                    Console.Write(dr["ids"].ToString() + "    ");
                    Console.Write(dr["name"].ToString() + "    ");
                    Console.Write(dr["price"].ToString() + "    ");
                    Console.Write(dr["source"].ToString() + "    ");
                    Console.Write(dr["stack"].ToString() + "    ");
                    Console.WriteLine(dr["image"].ToString());

                }

                conn.Close();

                //解决方案
                Console.Write("请输入编号");
                string ids = Console.ReadLine();
                Console.Write("请输入名称");
                string name = Console.ReadLine();

                string str = "server=.;database=mydb;user=sa;pwd=123";
                SqlConnection conn = new SqlConnection(str);

                SqlCommand cmd = conn.CreateCommand();
               //字符串注入攻击 ‘空格or 1=1 -- 
                //避免攻击 占位符赋值
                //cmd.CommandText = "select * from fruit where ids=@ids and name=@name";
                //cmd.Parameters.Clear();
                //cmd.Parameters.Add("@ids", ids);
                //cmd.Parameters.Add("@name", name);
                //parameters集合    使其作为整体放进去，而不是拼接
              

                conn.Open();
                SqlDataReader dr = cmd.ExecuteReader();

                while (dr.Read())
                {
                    Console.Write(dr["ids"].ToString() + "    ");
                    Console.Write(dr["name"].ToString() + "    ");
                    Console.Write(dr["price"].ToString() + "    ");
                    Console.Write(dr["source"].ToString() + "    ");
                    Console.Write(dr["stack"].ToString() + "    ");
                    Console.WriteLine(dr["image"].ToString());

                }

                conn.Close();

解决前

解决后