我有这个aspx（html）代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="SearchCustomer.aspx.cs" Inherits="WebApplication1.eyeofheaven.SearchCustomer" %>
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" type="text/css" href="StyleSheets/SearchCustomerStyle.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap-theme.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<title>Search Customer</title>
</head>
<body>
<form id="form1" runat="server">
<div class="row">
<div class="twelve columns">
<!-- Header-->
<div class="container">
<nav role="navigation" class="navbar navbar-inverse navbar-fixed-top">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" data-target="#navbarCollapse" data-toggle="collapse" class="navbar-toggle">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<!-- Collection of nav links, forms, and other content for toggling -->
<div id="navbarCollapse" class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li><a href="EyeOfHeaven.aspx">Home</a></li>
<li class="dropdown">
<a data-toggle="dropdown" class="dropdown-toggle active" href="#">Search<b class="caret"></b></a>
<ul role="menu" class="dropdown-menu">
<li><a href="SearchCustomer.aspx">Search Form(Customer)</a></li>
<li><a href="SearchVehicle.aspx">Search Form(Vehicle)</a></li>
</ul>
</li>
</ul>
</div>
</nav>
</div>
</div>
</div>
<!-- Search form customer-->
<div id="searchcustomer" class="page-header">
<h3><span class="glyphicon glyphicon-th-large"></span>Search Customer</h3>
</div>
<div class="row">
<div class="col-md-4">
<input type="text" runat="server" id="search" size="20" class="form-control" placeholder="Customer ID">
</div>
<div class="col-md-4">
<select class="form-control" runat="server" id="Country">
<option value="select" selected disabled>Search by Country</option>
<option value="A:C ESTUDIO">A:C ESTUDIO</option>
<option value="Aaron McEwen-194712">Aaron McEwen-194712</option>
<option value="Accra">Accra</option>
<option value="Adoany">Adoany</option>
<option value="Aduanas">Aduanas</option>
<option value="Alex Sanchez-259029">Alex Sanchez-259029</option>
<option value="ALG Consulting-288078">ALG Consulting-288078</option>
<option value="Algeria">Algeria</option>
<option value="Algimantas Ramaskevicius">Algimantas Ramaskevicius</option>
<option value="Allan Demeritte-233953">Allan Demeritte-233953</option>
<option value="Althea Gibson-223990">Althea Gibson-223990</option>
<option value="Alvaro Delgado-279974">Alvaro Delgado-279974</option>
<option value="Amber Williamsen-212332">Amber Williamsen-212332</option>
<option value="Amos Peters-217784">Amos Peters-217784</option>
<option value="andersongordon-234453">andersongordon-234453</option>
<option value="Andrey Bolshakov-189544">Andrey Bolshakov-189544</option>
<option value="Angela green-220269">Angela green-220269</option>
<option value="ANGELMILLER-179184">ANGELMILLER-179184</option>
<option value="Angola">Angola</option>
<option value="Anguilla">Anguilla</option>
<option value="Anthony Knight-235064">Anthony Knight-235064</option>
<option value="Antigua and Barbuda">Antigua and Barbuda</option>
<option value="Anton Transport">Anton Transport</option>
<option value="Argentina">Argentina</option>
<option value="Armenia">Armenia</option>
<option value="Aruba">Aruba</option>
<option value="Australia">Australia</option>
<option value="Austria">Austria</option>
<option value="Bahamas">Bahamas</option>
<option value="Bahrain">Bahrain</option>
<option value="Bangladesh">Bangladesh</option>
<option value="Barbados">Barbados</option>
<option value="Belgium">Belgium</option>
<option value="Belize">Belize</option>
<option value="Benin">Benin</option>
<option value="Bermuda">Bermuda</option>
</select>
</div>
<div class="col-md-4">
<select class="form-control" runat="server" id="Currency">
<option value="selected" selected disabled>Search by Currency</option>
<option value="AUD">AUD Australian Dollar</option>
<option value="EUR">EUR</option>
<option value="GBP">GBP United Kingdom Pounds</option>
<option value="JPY">JPY Japan Yen</option>
<option value="NZD">NZD New Zealand Dollar</option>
</select>
</div>
</div>
<div class="row">
<div class="col-md-4">
<button type="button" runat="server" onserverclick="Button1_Click" id="searchinfo" class="btn btn-primary"><span class="glyphicon glyphicon-search"></span> Search Info</button>
</div>
</div>
<!-- Information Table-->
<div id="gridview">
<asp:GridView runat="Server" id="data" CssClass="table table-striped table-bordered table-responsive">
</asp:GridView>
</div>
</form>
</body>
</html>
它的aspx.cs代码背后：
using MSSQLConnector;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication1.eyeofheaven
{
public partial class SearchCustomer : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
MSConnector connector = new MSConnector();
connector.ConnectionString = "SERVER=xbetasql,52292;UID=username;Password=secret;DATABASE=ATDBSQL;";
string customer = (this.search.Value);
string country = (this.Country.Value);
string idcurrency = (this.Currency.Value);
string query = null;
if (country != "select")
{
query = "select * from customer where country = '" + country + "'";
}
else if (idcurrency != "selected")
{
query = "select * from customer where idcurrency = '" + idcurrency + "'";
}
else if ((country != "select") && (idcurrency != "selected"))
{
query = "select * from customer where country = '" + country + "select * from customer where idcurrency = '" + idcurrency + "'";
}
else if (customer == customer)
{
query = "select * from customer where idcustomer = '" + customer + "'";
}
else if (customer == "")
{
Response.Write("<script>alert('No Id Inputted, Data Not Found.')</script>");
}
DataSet selectedData = connector.ExecuteQuery(query);
DataTable dt = selectedData.Tables[0];
data.DataSource = dt;
data.DataBind();
}
}
}
我对条件有疑问，我想在选择两个选项时让我的选择标签显示数据，例如：我从国家选择“Aduanas”，然后从货币中选择另一个选项“USD”。但它只会获取我选择的第一个选择标记（国家）的数据，我的条件不会读取并获取国家和货币的两个值的数据。我是c＃编程和ms sql的新手，我正在学习它的语法和功能。
我的条件有关下面的国家/地区和货币（选择标记）：
else if ((country != "select") && (idcurrency != "selected"))
{
query = "select * from customer where country = '" + country + "select * from customer where idcurrency = '" + idcurrency + "'";
}
答案 0 :(得分：4)
SQL中存在语法错误;而不是：
query = "select * from customer where country = '" + country + "select * from customer where idcurrency = '" + idcurrency + "'";
应该如下：
query = "select * from customer where country = '" + country + "' AND idcurrency = '" + idcurrency + "'";
希望这可能会有所帮助。
答案 1 :(得分：4)
根据您当前的代码，当您选择国家/地区时，无论您是否选择货币，都会始终执行下面的第一个if区块
if (country != "select")
{
query = "select * from customer where country = '" + country + "'";
}
您还需要检查第一个if块内的所选货币。我还修复了错误的SQL语法。
if (country != "select")
{
if (idcurrency != "selected")
{
query = "select * from customer where country = '" + country + "' and idcurrency = '" + idcurrency + "'";
}
else
{
query = "select * from customer where country = '" + country + "'";
}
}