如何在连接到数据库之前加载控制器，甚至在 MySQL 关闭时加载控制器
How to load a controller before connecting to DB or even when MySQL turned off
我想知道是否有人可以帮助我在框架连接到数据库之前加载一个 "maintanence" 控制器。
这将加载 tpl 文件。
例如，当应用程序正在构建时，我想关闭 MySQL 数据库，但我想向获得我的网页的人展示一个页面（由控制器加载的 tpl 文件）"we are under construction"页面和所有这些通过加载 tpl 文件而不需要 PHP 文件。
OpenCart 核心在加载任何控制器之前建立数据库连接。因此，如果您打算切换到维护模式，在向用户显示任何内容之前，数据库连接已经建立。
几乎不可能将 DB 与核心分开，因为它是如此紧密耦合。
唯一的解决方案是创建一个 index.html 文件作为维护模式 html 的副本，就像 Paul Feakins 在评论中回复的那样。
这里有一个干净的 html 您可以使用。应该为任何人工作。
在您的根目录中创建 index.html 并粘贴此代码：
<!DOCTYPE html>
<!--[if IE]><![endif]-->
<!--[if IE 8 ]><html dir="ltr" lang="en" class="ie8"><![endif]-->
<!--[if IE 9 ]><html dir="ltr" lang="en" class="ie9"><![endif]-->
<!--[if (gt IE 9)|!(IE)]><!-->
<html dir="ltr" lang="en">
<!--<![endif]-->
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Maintenance</title>
<script src="catalog/view/javascript/jquery/jquery-2.1.1.min.js" type="text/javascript"></script>
<link href="catalog/view/javascript/bootstrap/css/bootstrap.min.css" rel="stylesheet" media="screen" />
<script src="catalog/view/javascript/bootstrap/js/bootstrap.min.js" type="text/javascript"></script>
<link href="catalog/view/javascript/font-awesome/css/font-awesome.min.css" rel="stylesheet" type="text/css" />
<link href="//fonts.googleapis.com/css?family=Open+Sans:400,400i,300,700" rel="stylesheet" type="text/css" />
<link href="catalog/view/theme/default/stylesheet/stylesheet.css" rel="stylesheet">
<script src="catalog/view/javascript/common.js" type="text/javascript"></script>
<link href="/image/catalog/cart.png" rel="icon" />
</head>
<body>
<nav id="top">
<div class="container"><div class="pull-left">
<form action="/index.html" method="post" enctype="multipart/form-data" id="form-currency">
<div class="btn-group">
<button class="btn btn-link dropdown-toggle" data-toggle="dropdown"> <strong>$</strong> <span class="hidden-xs hidden-sm hidden-md">Currency</span> <i class="fa fa-caret-down"></i></button>
<ul class="dropdown-menu">
<li>
<button class="currency-select btn btn-link btn-block" type="button" name="EUR">€ Euro</button>
</li>
<li>
<button class="currency-select btn btn-link btn-block" type="button" name="GBP">£ Pound Sterling</button>
</li>
<li>
<button class="currency-select btn btn-link btn-block" type="button" name="USD">$ US Dollar</button>
</li>
</ul>
</div>
<input type="hidden" name="code" value="" />
<input type="hidden" name="redirect" value="/index.html" />
</form>
</div>
<div id="top-links" class="nav pull-right">
<ul class="list-inline">
<li><a href="/index.html"><i class="fa fa-phone"></i></a> <span class="hidden-xs hidden-sm hidden-md">123456789</span></li>
<li class="dropdown"><a href="/index.html" title="My Account" class="dropdown-toggle" data-toggle="dropdown"><i class="fa fa-user"></i> <span class="hidden-xs hidden-sm hidden-md">My Account</span> <span class="caret"></span></a>
<ul class="dropdown-menu dropdown-menu-right">
<li><a href="/index.html">Register</a></li>
<li><a href="/index.html">Login</a></li>
</ul>
</li>
<li><a href="/index.html" id="wishlist-total" title="Wish List (0)"><i class="fa fa-heart"></i> <span class="hidden-xs hidden-sm hidden-md">Wish List (0)</span></a></li>
<li><a href="/index.html" title="Shopping Cart"><i class="fa fa-shopping-cart"></i> <span class="hidden-xs hidden-sm hidden-md">Shopping Cart</span></a></li>
<li><a href="/index.html" title="Checkout"><i class="fa fa-share"></i> <span class="hidden-xs hidden-sm hidden-md">Checkout</span></a></li>
</ul>
</div>
</div>
</nav>
<header>
<div class="container">
<div class="row">
<div class="col-sm-4">
<div id="logo"> <h1><a href="/index.html">Your Store</a></h1>
</div>
</div>
<div class="col-sm-5"><div id="search" class="input-group">
<input type="text" name="search" value="" placeholder="Search" class="form-control input-lg" />
<span class="input-group-btn">
<button type="button" class="btn btn-default btn-lg"><i class="fa fa-search"></i></button>
</span>
</div></div>
<div class="col-sm-3"><div id="cart" class="btn-group btn-block">
<button type="button" data-toggle="dropdown" data-loading-text="Loading..." class="btn btn-inverse btn-block btn-lg dropdown-toggle"><i class="fa fa-shopping-cart"></i> <span id="cart-total">0 item(s) - [=10=].00</span></button>
<ul class="dropdown-menu pull-right">
<li>
<p class="text-center">Your shopping cart is empty!</p>
</li>
</ul>
</div>
</div>
</div>
</div>
</header>
<div class="container">
<nav id="menu" class="navbar">
<div class="navbar-header"><span id="category" class="visible-xs">Categories</span>
<button type="button" class="btn btn-navbar navbar-toggle" data-toggle="collapse" data-target=".navbar-ex1-collapse"><i class="fa fa-bars"></i></button>
</div>
<div class="collapse navbar-collapse navbar-ex1-collapse">
<ul class="nav navbar-nav">
<li class="dropdown"><a href="/index.html" class="dropdown-toggle" data-toggle="dropdown">Desktops</a>
</li>
<li class="dropdown"><a href="/index.html" class="dropdown-toggle" data-toggle="dropdown">Laptops & Notebooks</a>
</li>
<li class="dropdown"><a href="/index.html" class="dropdown-toggle" data-toggle="dropdown">Components</a>
</li>
<li><a href="/index.html">Tablets</a></li>
<li><a href="/index.html">Software</a></li>
<li><a href="/index.html">Phones & PDAs</a></li>
<li><a href="/index.html">Cameras</a></li>
</ul>
</div>
</nav>
</div>
<div id="common-maintenance" class="container">
<div class="row">
<div class="col-12"><h1 style="text-align:center;">We are currently performing some scheduled maintenance. <br/>We will be back as soon as possible. Please check back soon.</h1></div>
</div>
</div>
<footer>
<div class="container">
<div class="row">
<div class="col-sm-3">
<h5>Information</h5>
<ul class="list-unstyled">
<li><a href="/index.html">About Us</a></li>
<li><a href="/index.html">Delivery Information</a></li>
<li><a href="/index.html">Privacy Policy</a></li>
<li><a href="/index.html">Terms & Conditions</a></li>
</ul>
</div>
<div class="col-sm-3">
<h5>Customer Service</h5>
<ul class="list-unstyled">
<li><a href="/index.html">Contact Us</a></li>
<li><a href="/index.html">Returns</a></li>
<li><a href="/index.html">Site Map</a></li>
</ul>
</div>
<div class="col-sm-3">
<h5>Extras</h5>
<ul class="list-unstyled">
<li><a href="/index.html">Brands</a></li>
<li><a href="/index.html">Gift Certificates</a></li>
<li><a href="/index.html">Affiliate</a></li>
<li><a href="/index.html">Specials</a></li>
</ul>
</div>
<div class="col-sm-3">
<h5>My Account</h5>
<ul class="list-unstyled">
<li><a href="/index.html">My Account</a></li>
<li><a href="/index.html">Order History</a></li>
<li><a href="/index.html">Wish List</a></li>
<li><a href="/index.html">Newsletter</a></li>
</ul>
</div>
</div>
<hr>
<p>Powered By <a href="http://www.opencart.com">OpenCart</a><br /> Your Store © 2019</p>
</div>
</footer>
<!--
OpenCart is open source software and you are free to remove the powered by OpenCart if you want, but its generally accepted practise to make a small donation.
Please donate via PayPal to donate@opencart.com
//-->
</body></html>
我想知道是否有人可以帮助我在框架连接到数据库之前加载一个 "maintanence" 控制器。 这将加载 tpl 文件。 例如，当应用程序正在构建时，我想关闭 MySQL 数据库，但我想向获得我的网页的人展示一个页面（由控制器加载的 tpl 文件）"we are under construction"页面和所有这些通过加载 tpl 文件而不需要 PHP 文件。
OpenCart 核心在加载任何控制器之前建立数据库连接。因此，如果您打算切换到维护模式，在向用户显示任何内容之前，数据库连接已经建立。
几乎不可能将 DB 与核心分开，因为它是如此紧密耦合。
唯一的解决方案是创建一个 index.html 文件作为维护模式 html 的副本，就像 Paul Feakins 在评论中回复的那样。
这里有一个干净的 html 您可以使用。应该为任何人工作。
在您的根目录中创建 index.html 并粘贴此代码：
<!DOCTYPE html>
<!--[if IE]><![endif]-->
<!--[if IE 8 ]><html dir="ltr" lang="en" class="ie8"><![endif]-->
<!--[if IE 9 ]><html dir="ltr" lang="en" class="ie9"><![endif]-->
<!--[if (gt IE 9)|!(IE)]><!-->
<html dir="ltr" lang="en">
<!--<![endif]-->
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Maintenance</title>
<script src="catalog/view/javascript/jquery/jquery-2.1.1.min.js" type="text/javascript"></script>
<link href="catalog/view/javascript/bootstrap/css/bootstrap.min.css" rel="stylesheet" media="screen" />
<script src="catalog/view/javascript/bootstrap/js/bootstrap.min.js" type="text/javascript"></script>
<link href="catalog/view/javascript/font-awesome/css/font-awesome.min.css" rel="stylesheet" type="text/css" />
<link href="//fonts.googleapis.com/css?family=Open+Sans:400,400i,300,700" rel="stylesheet" type="text/css" />
<link href="catalog/view/theme/default/stylesheet/stylesheet.css" rel="stylesheet">
<script src="catalog/view/javascript/common.js" type="text/javascript"></script>
<link href="/image/catalog/cart.png" rel="icon" />
</head>
<body>
<nav id="top">
<div class="container"><div class="pull-left">
<form action="/index.html" method="post" enctype="multipart/form-data" id="form-currency">
<div class="btn-group">
<button class="btn btn-link dropdown-toggle" data-toggle="dropdown"> <strong>$</strong> <span class="hidden-xs hidden-sm hidden-md">Currency</span> <i class="fa fa-caret-down"></i></button>
<ul class="dropdown-menu">
<li>
<button class="currency-select btn btn-link btn-block" type="button" name="EUR">€ Euro</button>
</li>
<li>
<button class="currency-select btn btn-link btn-block" type="button" name="GBP">£ Pound Sterling</button>
</li>
<li>
<button class="currency-select btn btn-link btn-block" type="button" name="USD">$ US Dollar</button>
</li>
</ul>
</div>
<input type="hidden" name="code" value="" />
<input type="hidden" name="redirect" value="/index.html" />
</form>
</div>
<div id="top-links" class="nav pull-right">
<ul class="list-inline">
<li><a href="/index.html"><i class="fa fa-phone"></i></a> <span class="hidden-xs hidden-sm hidden-md">123456789</span></li>
<li class="dropdown"><a href="/index.html" title="My Account" class="dropdown-toggle" data-toggle="dropdown"><i class="fa fa-user"></i> <span class="hidden-xs hidden-sm hidden-md">My Account</span> <span class="caret"></span></a>
<ul class="dropdown-menu dropdown-menu-right">
<li><a href="/index.html">Register</a></li>
<li><a href="/index.html">Login</a></li>
</ul>
</li>
<li><a href="/index.html" id="wishlist-total" title="Wish List (0)"><i class="fa fa-heart"></i> <span class="hidden-xs hidden-sm hidden-md">Wish List (0)</span></a></li>
<li><a href="/index.html" title="Shopping Cart"><i class="fa fa-shopping-cart"></i> <span class="hidden-xs hidden-sm hidden-md">Shopping Cart</span></a></li>
<li><a href="/index.html" title="Checkout"><i class="fa fa-share"></i> <span class="hidden-xs hidden-sm hidden-md">Checkout</span></a></li>
</ul>
</div>
</div>
</nav>
<header>
<div class="container">
<div class="row">
<div class="col-sm-4">
<div id="logo"> <h1><a href="/index.html">Your Store</a></h1>
</div>
</div>
<div class="col-sm-5"><div id="search" class="input-group">
<input type="text" name="search" value="" placeholder="Search" class="form-control input-lg" />
<span class="input-group-btn">
<button type="button" class="btn btn-default btn-lg"><i class="fa fa-search"></i></button>
</span>
</div></div>
<div class="col-sm-3"><div id="cart" class="btn-group btn-block">
<button type="button" data-toggle="dropdown" data-loading-text="Loading..." class="btn btn-inverse btn-block btn-lg dropdown-toggle"><i class="fa fa-shopping-cart"></i> <span id="cart-total">0 item(s) - [=10=].00</span></button>
<ul class="dropdown-menu pull-right">
<li>
<p class="text-center">Your shopping cart is empty!</p>
</li>
</ul>
</div>
</div>
</div>
</div>
</header>
<div class="container">
<nav id="menu" class="navbar">
<div class="navbar-header"><span id="category" class="visible-xs">Categories</span>
<button type="button" class="btn btn-navbar navbar-toggle" data-toggle="collapse" data-target=".navbar-ex1-collapse"><i class="fa fa-bars"></i></button>
</div>
<div class="collapse navbar-collapse navbar-ex1-collapse">
<ul class="nav navbar-nav">
<li class="dropdown"><a href="/index.html" class="dropdown-toggle" data-toggle="dropdown">Desktops</a>
</li>
<li class="dropdown"><a href="/index.html" class="dropdown-toggle" data-toggle="dropdown">Laptops & Notebooks</a>
</li>
<li class="dropdown"><a href="/index.html" class="dropdown-toggle" data-toggle="dropdown">Components</a>
</li>
<li><a href="/index.html">Tablets</a></li>
<li><a href="/index.html">Software</a></li>
<li><a href="/index.html">Phones & PDAs</a></li>
<li><a href="/index.html">Cameras</a></li>
</ul>
</div>
</nav>
</div>
<div id="common-maintenance" class="container">
<div class="row">
<div class="col-12"><h1 style="text-align:center;">We are currently performing some scheduled maintenance. <br/>We will be back as soon as possible. Please check back soon.</h1></div>
</div>
</div>
<footer>
<div class="container">
<div class="row">
<div class="col-sm-3">
<h5>Information</h5>
<ul class="list-unstyled">
<li><a href="/index.html">About Us</a></li>
<li><a href="/index.html">Delivery Information</a></li>
<li><a href="/index.html">Privacy Policy</a></li>
<li><a href="/index.html">Terms & Conditions</a></li>
</ul>
</div>
<div class="col-sm-3">
<h5>Customer Service</h5>
<ul class="list-unstyled">
<li><a href="/index.html">Contact Us</a></li>
<li><a href="/index.html">Returns</a></li>
<li><a href="/index.html">Site Map</a></li>
</ul>
</div>
<div class="col-sm-3">
<h5>Extras</h5>
<ul class="list-unstyled">
<li><a href="/index.html">Brands</a></li>
<li><a href="/index.html">Gift Certificates</a></li>
<li><a href="/index.html">Affiliate</a></li>
<li><a href="/index.html">Specials</a></li>
</ul>
</div>
<div class="col-sm-3">
<h5>My Account</h5>
<ul class="list-unstyled">
<li><a href="/index.html">My Account</a></li>
<li><a href="/index.html">Order History</a></li>
<li><a href="/index.html">Wish List</a></li>
<li><a href="/index.html">Newsletter</a></li>
</ul>
</div>
</div>
<hr>
<p>Powered By <a href="http://www.opencart.com">OpenCart</a><br /> Your Store © 2019</p>
</div>
</footer>
<!--
OpenCart is open source software and you are free to remove the powered by OpenCart if you want, but its generally accepted practise to make a small donation.
Please donate via PayPal to donate@opencart.com
//-->
</body></html>