【发布时间】：2013-12-24 17:44:01
【问题描述】：
我的网站使用 PHP、MySQL、Smarty、jQuery、AJAX 等。目前，我正在从 MySQL 数据库中获取大量数据（匹配问题 ID），对其进行处理，将这些数据分配给 Smarty 模板并将其打印在网页上。由于要获取的数据量太大并且正在进一步处理，因此获取最终输出数据需要花费太多时间。反过来，将整个数据显示给用户需要太多时间。
我想到了一种方法，但无法实施。我的方法是运行两个过程，获取单个匹配的question_id 并同时将其显示到浏览器并重复此循环，直到获取并显示所有匹配的问题 ID。当显示单行的加载数据时，加载器图像应该显示在显示的记录下。当所有数据都被打印出来时，加载器图像应该会消失。
但我面临的主要问题是我应该如何不断地将数据分配给 Smarty 模板并显示模板，因为 Smarty 模板引擎首先加载所有内容，只有在完全拥有内容后才将其打印到浏览器.
为了您的参考，我将来自控制器、模型和视图的所有现有代码放在下面：
Controller (match_question.php)的PHP代码如下：
<?php
require_once("../../includes/application-header.php");
$objQuestionMatch = new QuestionMatch();
$request = empty( $_GET ) ? $_POST : $_GET ;
if($request['subject_id']!="")
$subject_id = $request['subject_id'];
if($request['topic_id']!="")
$topic_id = $request['topic_id'];
if($subject_id !='' && $topic_id !='')
$all_match_questions = $objQuestionMatch->GetSimilarQuestionsBySubjectIdTopicId($subject_id, $topic_id);
$smarty->assign('all_match_questions', $all_match_questions);
$smarty->display("match-question.tpl")
?>
Model(QuestionMatch.php)的PHP代码如下：
<?php
class QuestionMatch {
var $mError = "";
var $mCheck;
var $mDb;
var $mValidator;
var $mTopicId;
var $mTableName;
function __construct() {
global $gDb;
global $gFormValidation;
$this->mDb = $gDb;
$this->mValidator = $gFormValidation;
$this->mTableName = TBL_QUESTIONS;
}
/**
* This function is used to get all the questions from the given subject id and topic id
*/
function GetSimilarQuestionsBySubjectIdTopicId($subject_id, $topic_id) {
/*SQL query to find out questions from given subject_id and topic_id*/
$sql = " SELECT * FROM ".TBL_QUESTIONS." WHERE question_subject_id=".$subject_id;
$sql .= " AND question_topic_id=".$topic_id;
$this->mDb->Query($sql);
$questions_data = $this->mDb->FetchArray();
/*Same array $questions_data is assigned to new array $questions to avoid the reference mismatching*/
$questions = $questions_data;
/*Array of words to be excluded from comparison process
*For now it's a static array but when UI design will be there the array would be dynamic
*/
$exclude_words = array('which','who','what','how','when','whom','wherever','the','is','a','an','and','of','from');
/*This loop removes all the words of $exclude_words array from all questions and converts all
*converts all questions' text into lower case
*/
foreach($questions as $index=>$arr) {
$questions_array = explode(' ',strtolower($arr['question_text']));
$clean_questions = array_diff($questions_array, $exclude_words);
$questions[$index]['question_text'] = implode(' ',$clean_questions);
}
/*Now the actual comparison of each question with every other question stats here*/
foreach ($questions as $index=>$outer_data) {
/*Logic to find out the no. of count question appeared into tests*/
$sql = " SELECT count(*) as question_appeared_count FROM ".TBL_TESTS_QUESTIONS." WHERE test_que_id=";
$sql .= $outer_data['question_id'];
$this->mDb->Query($sql);
$qcount = $this->mDb->FetchArray(MYSQL_FETCH_SINGLE);
$question_appeared_count = $qcount['question_appeared_count'];
$questions_data[$index]['question_appeared_count'] = $question_appeared_count;
/*Crerated a new key in an array to hold similar question's ids*/
$questions_data[$index]['similar_questions_ids_and_percentage'] = Array();
$outer_question = $outer_data['question_text'];
$qpcnt = 0;
//foreach ($questions as $inner_data) {
/*This foreach loop is for getting every question to compare with outer foreach loop's
question*/
foreach ($questions as $secondIndex=>$inner_data) {
/*This condition is to avoid comparing the same questions again*/
if ($secondIndex <= $index) {
/*This is to avoid comparing the question with itself*/
if ($outer_data['question_id'] != $inner_data['question_id']) {
$inner_question = $inner_data['question_text'];
/*This is to calculate percentage of match between each question with every other question*/
similar_text($outer_question, $inner_question, $percent);
$percentage = number_format((float)$percent, 2, '.', '');
/*If $percentage is >= $percent_match only then push the respective question_id into an array*/
if($percentage >= 85) {
$questions_data[$index]['similar_questions_ids_and_percentage'][$qpcnt]['question_id'] = $inner_data['question_id'];
$questions_data[$index]['similar_questions_ids_and_percentage'][$qpcnt]['percentage'] = $percentage;
/*$questions_data[$secondIndex]['similar_questions_ids_and_percentage'][$qpcnt]['question_id'] = $outer_data['question_id'];
$questions_data[$secondIndex]['similar_questions_ids_and_percentage'][$qpcnt]['percentage'] = $percentage;*/
/*Logic to find out the no. of count question appeared into tests*/
$sql = " SELECT count(*) as question_appeared_count FROM ".TBL_TESTS_QUESTIONS." WHERE test_que_id=";
$sql .= $inner_data['question_id'];
$this->mDb->Query($sql);
$qcount = $this->mDb->FetchArray(MYSQL_FETCH_SINGLE);
$question_appeared_count = $qcount['question_appeared_count'];
$questions_data[$index]['similar_questions_ids_and_percentage'][$qpcnt]['question_appeared_count'] = $question_appeared_count;
$qpcnt++;
}
}
}
}
} //}
/*Logic to create the return_url when user clicks on any of the displayed matching question_ids*/
foreach ($questions_data as $index=>$outer_data) {
if(!empty($outer_data['similar_questions_ids_and_percentage'])) {
$return_url = ADMIN_SITE_URL.'modules/questions/match_question.php?';
$return_url .= 'op=get_question_detail&question_ids='.$outer_data['question_id'];
foreach($outer_data['similar_questions_ids_and_percentage'] as $secondIndex=>$inner_data) {
$return_url = $return_url.','.$inner_data['question_id'];
}
$questions_data[$index]['return_url'] = $return_url.'#searchPopContent';
}
}
/*This will return the complete array with matching question ids*/
return $questions_data;
}
}
?>
View(match-question.tpl)的代码如下：
<table width="100%" class="base-table tbl-practice" cellspacing="0" cellpadding="0" border="0">
<tr class="evenRow">
<th width="33%" style="text-align:center;" class="question-id">Que ID</th>
<th width="33%" style="text-align:center;" class="question-id">Matching Que IDs</th>
<th width="33%" style="text-align:center;" class="question-id">Percentage(%)</th>
</tr>
{if $all_match_questions}
{foreach from=$all_match_questions item=qstn key=key}
{if $qstn.similar_questions_ids_and_percentage}
{assign var=counter value=1}
<tr class="oddRow">
<td class="question-id" align="center" valign="top">
<a href="{$qstn.return_url}" title="View question" class="inline_view_question_detail">QUE{$qstn.question_id}</a>{if $qstn.question_appeared_count gt 0}-Appeared({$qstn.question_appeared_count}){/if}
</td>
{foreach from=$qstn.similar_questions_ids_and_percentage item=question key=q_no}
{if $counter gt 1}
<tr class="oddRow"><td class="question-id" align="center" valign="top"></td>
{/if}
<td class="question" align="center" valign="top">
{if $question.question_id!=''}
<a href="{$qstn.return_url}" title="View question" class="inline_view_question_detail">QUE{$question.question_id}</a>{if $question.question_appeared_count gt 0}-Appeared({$question.question_appeared_count}){/if}
{if $question.question_appeared_count eq 0}
<a id ="{$question.question_id}" href="#" class="c-icn c-remove delete_question" title="Delete question"> Delete</a>{/if}
{/if}
</td>
<td class="question" align="center" valign="top">
{if $question.percentage!=''}{$question.percentage}{/if}
{assign var=counter value=$counter+1}
</td>
</tr>
{/foreach}
{/if}
{/foreach}
{else}
<tr>
<td colspan="2" align="center"><b>No Questions Available</b></td>
</tr>
{/if}
</table>
感谢您抽出宝贵的时间来了解我的问题。
【问题讨论】：
-
如果问题是脚本超时你可以尝试使用
set_time_limit():php.net/manual/en/function.set-time-limit.php -
@KristerAndersson：脚本没有超时。用户必须等待很长时间才能加载所有数据。我想一步一步地显示数据，而不是让用户等待。我的问题是如何逐步打印数据，以便用户不应该等到整个数据（所有记录）被加载。
-
我建议您考虑使用
COL和COLGROUP以及固定的表格布局，以便浏览器在表格完全加载之前就知道如何布局表格。您可以通过将表更改为基于DIV的设置并测试其加载方式来测试这是否是您的罪魁祸首。请注意，缓冲区刷新（如@halfer 建议的那样）可能至关重要。
标签： php mysql ajax smarty output-buffering