首先，根据用户可以更改的输入连接一条 sql 语句，特别是当存储为字符串时，这是 SQL 注入漏洞的创建方式。不要成为那个人。
至于对查询字符串进行标记，请使用命名参数。假设这是您的查询字符串
?orderid=777&phone=777-777-7777
Response.QueryString["orderid"]
将返回 '777' 和
Response.QueryString["phone"]
将返回“777-777-7777”
至于你的 sql 注入问题，你有几个选择。一种是参数化的 sql 语句，请参见此处的 C# 示例：http ://rosettacode.org/wiki/Parametrized_SQL_statement
或使用带参数的存储过程。最不理想但最低限度可接受的选择是严格验证您的输入参数，特别是杀死像 '=;% 之类的字符 - 以及其他一些字符。
编辑：既然我有时间制作一个样本，请检查一下。此示例需要针对您的数据库进行定制，但它在我的带有测试表的 mysql 数据库上工作。您需要安装MySQLConnector包并添加对“MySql.Data”的项目引用，然后代码才能正确编译。
namespace WebApplication2
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e) {
//define some regex patterns for validating our data.
const string PHONEREGEX = @"((\(\d{3}\))|(\d{3}-))\d{3}-\d{4}";
const string ORDERNUMREGEX = @"\d*";
bool isValid = true;
string phone = Request.QueryString["phone"]; //read phone from querystring.
//validate that arg was provided, and matches our regular expression. this means it contains only numbers and single hyphens
if(!string.IsNullOrWhiteSpace(phone) && System.Text.RegularExpressions.Regex.IsMatch(phone, PHONEREGEX)){
Response.Write(HttpUtility.HtmlEncode(string.Format("The phone number is {0}", phone))); //HTML Encode the value before output, to prevent any toxic markup.
} else {
Response.Write("Phone number not provided.");
isValid = false;
}
string orderStr = Request.QueryString["order"]; //read ordernum from querystring
long order = long.MinValue;
//validate that order was provided and matches the regex meaning it is only numbers. then it parses the value into 'long order'.
if(!string.IsNullOrWhiteSpace(orderStr) && System.Text.RegularExpressions.Regex.IsMatch(orderStr, ORDERNUMREGEX) && long.TryParse(orderStr, out order)){
Response.Write(HttpUtility.HtmlEncode(string.Format("The order number is {0}", order))); //use 'long order' instead of orderStr.
} else {
Response.Write("Order number not provided.");
isValid = false;
}
//if all arguments are valid, query the DB.
if (isValid) {
Response.Write(GetOrderStatus( phone, order));
}
}
private static string GetOrderStatus(string phone, long order) {
string status = "";
//create a connection object
string connstring = "SERVER=<YOUR MYSQL SERVER>;DATABASE=<YOUR DATABASE>;UID=<YOUR USER>;PASSWORD=<YOUR PASSWORD>-";//this is a connection string for mysql. customize it to your needs.
MySql.Data.MySqlClient.MySqlConnection conn = new MySql.Data.MySqlClient.MySqlConnection(connstring); //put your connection string in this constructor call
//create a SQL command object
using (MySql.Data.MySqlClient.MySqlCommand cmd = new MySql.Data.MySqlClient.MySqlCommand()) { //use a using clause so resources are always released when done.
cmd.Connection = conn;
cmd.CommandText = "SELECT `Order_Status` FROM `<YOUR TABLE>` WHERE `Order` = @order AND `Phone` = @phone"; //this needs a From statement
//add parameters for your command. they fill in the @order and @phone in the sql statement above. customize these to match the data types in your database.
cmd.Parameters.Add("order", MySql.Data.MySqlClient.MySqlDbType.Int64,11).Value = order; //do not use @ sign in parameter name
cmd.Parameters.Add("phone", MySql.Data.MySqlClient.MySqlDbType.VarChar, 50).Value = phone;
//execute the command, read the results from the query.
cmd.Connection.Open();
using (MySql.Data.MySqlClient.MySqlDataReader reader = cmd.ExecuteReader()) {
while (reader.Read()) {
status = reader.GetString("Order_Status");
}
cmd.Connection.Close();
}
}
return status;
}
}
}