我设计的网页为什么可以向数据库存入数据，但是无法从数据库读取数据？在本机测试时都可以。 10

我将网页上传到新浪云后，读取留言和登录功能等一切需要从后台读取数据的功能都不能使用了，但是发送留言等存入数据的功能可以使用。下面是上传到新浪云的某一个PHP的代码，目的是... 我将网页上传到新浪云后，读取留言和登录功能等一切需要从后台读取数据的功能都不能使用了，但是发送留言等存入数据的功能可以使用。下面是上传到新浪云的某一个PHP的代码，目的是读取信息，在本机测试时$conn的值是mysqli_connect('127.0.0.1','root','','mybbs',3306);本机测试无问题。

<?php
header('Content-Type:application/json');
$conn=mysqli_connect(SAE_MYSQL_HOST_M, SAE_MYSQL_USER, SAE_MYSQL_PASS, SAE_MYSQL_DB, SAE_MYSQL_PORT);
mysqli_query($conn,"SET NAMES UTF8");
$sql="SELECT * FROM msgs;";
$result=mysqli_query($conn,$sql);
$msgList=[];

while(($row=mysqli_fetch_assoc($result))!==NULL){
$msgList[]=['uid'=>$row['uid'],'content'=>$row['content'],'time'=>$row['msgtime']];
}
$str=json_encode($msgList);
echo $str;
?> 展开

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#合辑# 面试问优缺点怎么回答最加分？

育知同创教育
2016-08-05 · 百度知道合伙人官方认证企业

育知同创教育

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html只能通过ajax接口跟后台数据库接口通信，然后取出来的数据在页面上显示。
以下是一个例子：

html文件suggest.html：
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<script language="JavaScript" type="text/javascript" src="ajax_search.js"></script>
<style type="text/css" media="screen">
body {
font: 11px arial;
}
.suggest_link {
background-color: #FFFFFF;
padding: 2px 6px 2px 6px;
cursor:hand;
}
.suggest_link_over {
background-color: #E8F2FE;
padding: 2px 6px 2px 6px;
}
#search_suggest {
position:relative;
background-color: #FFFFFF;
text-align: left;
border: 1px solid #000000;
left: -12px;
top: 1px;
height: 74px;
width: 170px;
display:none;
}
</style>
</head>
<body background="bg.gif">
<center>
<h3>实现搜索提示</h3>
<div style="width: 500px;">
<input type="text" id="txtSearch" name="txtSearch" onKeyUp="searchSuggest();" autocomplete="off" />
<input type="submit" id="cmdSearch" name="cmdSearch" value="搜索"/><br />
<div id="search_suggest"></div>
</div>
</center>
</body>
</html>

ajax_search.js：
var searchReq = createAjaxObj();
function createAjaxObj()
{
var httprequest=false;
if (window.XMLHttpRequest) //为非IE浏览器生成XmlHttpRequest对象
{
httprequest=new XMLHttpRequest()
if (httprequest.overrideMimeType) httprequest.overrideMimeType('text/xml')
}
else if (window.ActiveXObject) //为IE浏览器生成XmlHttpRequest对象
{
try
{
httprequest=new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e)
{
try
{
httprequest=new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e){}
}
}
return httprequest
}
function searchSuggest()
{
if (searchReq.readyState == 4 || searchReq.readyState == 0)
{
var str = escape(document.getElementById('txtSearch').value);
searchReq.open("GET", 'search?search=' + str, true);//向服务器端发送请求
searchReq.onreadystatechange = handleSearchSuggest; //设置回调函数
searchReq.send(null);
}
}
function handleSearchSuggest()
{ //这是回调函数，处理从服务器端返回的信息
if (searchReq.readyState == 4)
{
var ss = document.getElementById('search_suggest')
ss.innerHTML = '';
var str = searchReq.responseText.split("\n");
for(i=0; i < str.length - 1; i++)
{
var suggest = '<div onmouseover="javascript:suggestOver(this);" ';
suggest += 'onmouseout="javascript:suggestOut(this);" ';
suggest += 'onclick="javascript:setSearch(this.innerHTML);" ';
suggest += 'class="suggest_link">' + str[i] + '</div>';
ss.innerHTML += suggest;
ss.style.display="block";
}
}
}
function suggestOver(div_value)
{
div_value.className = 'suggest_link_over';
}
function suggestOut(div_value)
{
div_value.className = 'suggest_link';
}
function setSearch(value)
{
document.getElementById('txtSearch').value = value;
document.getElementById('search_suggest').innerHTML = '';
document.getElementById('search_suggest').style.display="none";
}

servlet文件SearchSuggest.java：
package com;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class SearchSuggest extends HttpServlet
{
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, java.io.IOException
{
response.setCharacterEncoding("UTF-8");
String search = request.getParameter("search"); //接受参数值

String sql = "select GoodsName from Goods where GoodsName like '"+search+"%' order by GoodsName";//设置查询语句
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
ArrayList vData = new ArrayList();
java.io.PrintWriter out = response.getWriter();
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); //注册数据库连接驱动

String MdbPath = "F:/sneaker/Tomcat/webapps/search/database/#costume.mdb";
String url= "jdbc:odbc:driver={Microsoft Access Driver (*.mdb)};DBQ=" + MdbPath ;
conn = DriverManager.getConnection(url);

stmt = conn.createStatement();
rs = stmt.executeQuery(sql); //执行查询
while (rs.next())
{
vData.add(rs.getString("GoodsName"));
}
StringBuilder buf = new StringBuilder();
for (int i=0;i<vData.size();i++)
{
String keyword = (String)vData.get(i);
buf.append(keyword+"\n");
}
out.print(buf.toString());//向客户端输出信息
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (stmt != null)
stmt.close();
if (conn != null)
conn.close();
} catch (SQLException sqle) {
}
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException
{
doPost(request, response);
}
}