1 /// <summary>
 2     /// 参数化查询预防SQL注入式攻击
 3     /// </summary>
 4     public int checkLogin(string loginName, string loginPwd)
 5     {
 6         string strsql = "select count(*) from tb_LoginUser where UserName=@UserName and PassWord=@PassWord";
 7         SqlConnection conn = new SqlConnection(ConfigurationManager.AppSettings["conStr"]);
 8         if (conn.State.Equals(ConnectionState.Closed))//存在，判断是否关闭
 9         {
10             conn.Open();                             //连接处于关闭状态，重新打开
11         }
12         SqlCommand sqlcom = new SqlCommand(strsql, conn);
13         sqlcom.Parameters.Add(new SqlParameter("@UserName", SqlDbType.NVarChar, 50));
14         sqlcom.Parameters["@UserName"].Value =http://www.mamicode.com/ loginName;
15         sqlcom.Parameters.Add(new SqlParameter("@PassWord", SqlDbType.NVarChar, 50));
16         sqlcom.Parameters["@PassWord"].Value =http://www.mamicode.com/ loginPwd;
17         int i = (int)sqlcom.ExecuteScalar();
18         conn.Close();
19         return i;
20     }