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ado.not--数据库防字符串注入攻击学习及练习

数据库防字符串注入攻击：
cmd.CommandText = "update student set name=@Sname,sex=@Ssex,birthday=@Sbirthday,score=@Sscore where code = @Scode";
cmd.Parameters.Clear(); ---------一个集合
cmd.Parameters.Add("@Sname", Sname);
cmd.Parameters.Add("@Ssex", Ssex); ---------------------用一个占位符代替输入的字符串，防止执行
cmd.Parameters.Add("@Sbirthday", Sbirthday);
cmd.Parameters.Add("@Sscore", Sscore);
cmd.Parameters.Add("@Scode", Scode);

练习题：
1、Car表数据查出显示
2、请输入要查的汽车名称：
请输入要查的汽车油耗：
请输入要查的汽车马力：
名称：宝马
油耗：8
马力：1

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5 using System.Threading.Tasks;
  6 using System.Data.SqlClient;
  7 
  8 namespace _06_22
  9 {
 10     class Program
 11     {
 12         static void Main(string[] args)
 13         {
 14 
 15             //练习题： 
 16           
 17                 #region  显示全部
 18                 //1、Car表数据查出显示
 19                 SqlConnection coon = new SqlConnection("server=.;database=Data0425;user=sa;pwd=123;");
 20                 SqlCommand com = coon.CreateCommand();
 21 
 22                 com.CommandText = "select * from car";
 23                 coon.Open();
 24                 SqlDataReader a1 = com.ExecuteReader();
 25                 if (a1.HasRows)
 26                 {
 27                     while (a1.Read())
 28                     {
 29                         Console.WriteLine("编号：" + a1["Code"] + " 品牌：" + a1["name"] + " 油耗：" + a1["oil"] + " 马力：" + a1["powers"] + " 排量：" + a1["exhaust"] + " 价格:" + a1["price"]);
 30                     }
 31                 }
 32 
 33                 coon.Close();
 34                 #endregion
 35 
 36                 //2、请输入要查的汽车名称：
 37                 //    请输入要查的汽车油耗：
 38                 //    请输入要查的汽车马力：
 39                 //名称：宝马
 40                 //油耗：8
 41                 //马力：1
 42 
 43 
 44 
 45                 for (; ; )
 46                 {
 47                     Console.Write("请输入要查的汽车名称：");
 48                     string cname = Console.ReadLine();
 49                     Console.Write("请输入要查的汽车油耗：");
 50                     string coil = Console.ReadLine();
 51                     Console.Write(" 请输入要查的汽车马力：");
 52                     string cpowers = Console.ReadLine();        //输入查询内容
 53 
 54 
 55                     #region       三项不为空时
 56                     if (cname != "" && coil != "" && cpowers != "")   //三项不为空时
 57                     {
 58                         com.CommandText = "select * from car where name like @cname and oil like @coil and powers like @cpowers ";
 59 
 60                         com.Parameters.Clear();  ------防字符串注入攻击
 61                         com.Parameters.Add("@cname","%"+cname+"%");
 62                         com.Parameters.Add("@coil","%"+coil+"%");
 63                         com.Parameters.Add("@cpowers","%"+cpowers+"%");
 64 
 65                         coon.Open();
 66                         SqlDataReader c1 = com.ExecuteReader();
 67                         if (c1.HasRows)
 68                         {
 69                             while (c1.Read())
 70                             {
 71                                 Console.WriteLine("编号：" + c1["Code"] + " 品牌：" + c1["name"] + " 油耗：" + c1["oil"] + " 马力：" + c1["powers"] + " 排量：" + c1["exhaust"] + " 价格:" + c1["price"]);
 72                             }
 73                             Console.Write("是否结束？[y/n]");   ------是否跳出
 74                             string js = Console.ReadLine();
 75                             if (js == "y")
 76                             { break; }
 77                         }
 78                         else
 79                         { Console.WriteLine("查无此项！！！重新输入！！"); }
 80                         coon.Close();
 81                     }
 82 
 83                     #endregion
 84 
 85                     #region       cname为空时
 86                     else if (cname == "" && coil != "" && cpowers != "")
 87                     {
 88                         com.CommandText = "select * from car where oil like @coil and powers like @cpowers ";
 89 
 90                         com.Parameters.Clear();
 91                         com.Parameters.Add("@coil", "%" + coil + "%");
 92                         com.Parameters.Add("@cpowers", "%" + cpowers + "%");
 93 
 94                         coon.Open();
 95                         SqlDataReader c1 = com.ExecuteReader();
 96                         if (c1.HasRows)
 97                         {
 98                             while (c1.Read())
 99                             {
100                                 Console.WriteLine("编号：" + c1["Code"] + " 品牌：" + c1["name"] + " 油耗：" + c1["oil"] + " 马力：" + c1["powers"] + " 排量：" + c1["exhaust"] + " 价格:" + c1["price"]);
101                             }
102                             Console.Write("是否结束？[y/n]");
103                             string js = Console.ReadLine();
104                             if (js == "y")
105                             { break; }
106                         }
107                         else
108                         { Console.WriteLine("查无此项！！！重新输入！！"); }
109                         coon.Close();
110                     }
111 
112                     #endregion
113 
114                     #region      coil为空时
115                     else if (cname != "" && coil == "" && cpowers != "")
116                     {
117                         com.CommandText = "select * from car where name like @cname and powers like @cpowers ";
118 
119                         com.Parameters.Clear();
120                         com.Parameters.Add("@cname", "%" + cname + "%");
121                         com.Parameters.Add("@cpowers", "%" + cpowers + "%");
122 
123                         coon.Open();
124                         SqlDataReader c1 = com.ExecuteReader();
125                         if (c1.HasRows)
126                         {
127                             while (c1.Read())
128                             {
129                                 Console.WriteLine("编号：" + c1["Code"] + " 品牌：" + c1["name"] + " 油耗：" + c1["oil"] + " 马力：" + c1["powers"] + " 排量：" + c1["exhaust"] + " 价格:" + c1["price"]);
130                             }
131                             Console.Write("是否结束？[y/n]");
132                             string js = Console.ReadLine();
133                             if (js == "y")
134                             { break; }
135                         }
136                         else
137                         { Console.WriteLine("查无此项！！！重新输入！！"); }
138                         coon.Close();
139                     }
140 
141                     #endregion
142 
143                     #region       cpowers为空时
144                     else if (cname != "" && coil != "" && cpowers == "")
145                     {
146                         com.CommandText = "select * from car where name like @cname and oil like @coil ";
147 
148                         com.Parameters.Clear();
149                         com.Parameters.Add("@cname", "%" + cname + "%");
150                         com.Parameters.Add("@coil", "%" + coil + "%");
151 
152                         coon.Open();
153                         SqlDataReader c1 = com.ExecuteReader();
154                         if (c1.HasRows)
155                         {
156                             while (c1.Read())
157                             {
158                                 Console.WriteLine("编号：" + c1["Code"] + " 品牌：" + c1["name"] + " 油耗：" + c1["oil"] + " 马力：" + c1["powers"] + " 排量：" + c1["exhaust"] + " 价格:" + c1["price"]);
159                             }
160                             Console.Write("是否结束？[y/n]");
161                             string js = Console.ReadLine();
162                             if (js == "y")
163                             { break; }
164                         }
165                         else
166                         { Console.WriteLine("查无此项！！！重新输入！！"); }
167                         coon.Close();
168                     }
169 
170                     #endregion
171 
172                     #region       cname不为空时
173                     else if (cname != "" && coil == "" && cpowers == "")
174                     {
175                         com.CommandText = "select * from car where name like @cname";
176 
177                         com.Parameters.Clear();
178                         com.Parameters.Add("@cname", "%" + cname + "%");
179                        
180                         coon.Open();
181                         SqlDataReader c1 = com.ExecuteReader();
182                         if (c1.HasRows)
183                         {
184                             while (c1.Read())
185                             {
186                                 Console.WriteLine("编号：" + c1["Code"] + " 品牌：" + c1["name"] + " 油耗：" + c1["oil"] + " 马力：" + c1["powers"] + " 排量：" + c1["exhaust"] + " 价格:" + c1["price"]);
187                             }
188                             Console.Write("是否结束？[y/n]");
189                             string js = Console.ReadLine();
190                             if (js == "y")
191                             { break; }
192                           
193                         }
194                         else
195                         { Console.WriteLine("查无此项！！！重新输入！！"); }
196                         coon.Close();
197                     }
198 
199                     #endregion
200 
201                     #region       coil不为空时
202                     else if (cname == "" && coil != "" && cpowers == "")
203                     {
204                         com.CommandText = "select * from car where oil like @coil";
205 
206                         com.Parameters.Clear();
207                         com.Parameters.Add("@coil", "%" + coil + "%");
208 
209                         coon.Open();
210                         SqlDataReader c1 = com.ExecuteReader();
211                         if (c1.HasRows)
212                         {
213                             while (c1.Read())
214                             {
215                                 Console.WriteLine("编号：" + c1["Code"] + " 品牌：" + c1["name"] + " 油耗：" + c1["oil"] + " 马力：" + c1["powers"] + " 排量：" + c1["exhaust"] + " 价格:" + c1["price"]);
216                             }
217                             Console.Write("是否结束？[y/n]");
218                             string js = Console.ReadLine();
219                             if (js == "y")
220                             { break; }
221                         }
222                         else
223                         { Console.WriteLine("查无此项！！！重新输入！！"); }
224                         coon.Close();
225                     }
226 
227                     #endregion
228 
229                     #region       cpowers不为空时
230                     else if (cname == "" && coil == "" && cpowers != "")
231                     {
232                         com.CommandText = "select * from car where  powers like @cpowers ";
233 
234                         com.Parameters.Clear();
235                         com.Parameters.Add("@cpowers", "%" + cpowers + "%");
236 
237                         coon.Open();
238                         SqlDataReader c1 = com.ExecuteReader();
239                         if (c1.HasRows)
240                         {
241                             while (c1.Read())
242                             {
243                                 Console.WriteLine("编号：" + c1["Code"] + " 品牌：" + c1["name"] + " 油耗：" + c1["oil"] + " 马力：" + c1["powers"] + " 排量：" + c1["exhaust"] + " 价格:" + c1["price"]);
244                             }
245                             Console.Write("是否结束？[y/n]");
246                             string js = Console.ReadLine();
247                             if (js == "y")
248                             { break; }
249                         }
250                         else
251                         { Console.WriteLine("查无此项！！！重新输入！！"); }
252                         coon.Close();
253                     }
254 
255                     #endregion
256 
257                   
258                    
259                 } 
260             Console.ReadLine();
261         }
262     }     
263 }

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原文地址：https://www.cnblogs.com/tonyhere/p/5620414.html

ado.not--数据库防字符串注入攻击学习及 练习

ado.not--数据库防字符串注入攻击学习及练习