doctrine分页组件pagerfanta单独使用完全攻略

为了独立使用composer，不依赖框架。
假设当前使用的db类库是doctrine，则分页该怎么用？
本代码完全脱离symfony环境。只加载对应的db类库，故意不使用模板，让代码含义更加清晰。

composer
<pre name="code" class="java">
{
    "require": {
        "doctrine/dbal":"2.5.12",
        "pagerfanta/pagerfanta":"1.0.5"
    }
}
</pre>

建表
<pre name="code" class="java">
CREATE TABLE `test_databases` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `db_name` varchar(100) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '' COMMENT '库名',
  `user_id` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '测试用户id',
  `created_at` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '创建时间',
  `updated_at` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '修改时间',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB
</pre>

请自行插入一百条数据。

假设本机项目域名www.t3.com
本代码网址
http://www.t3.com/paginator/doctrine
首页只需输入上面网址即可，点击分页链接，会自动加page查询参数。

<pre name="code" class="java">
<?php

namespace app\control;
// use Illuminate\Database\Capsule\Manager as Capsule;
// // use \Illuminate\Events\Dispatcher;
// // use \Illuminate\Container\Container;
// use Illuminate\Pagination\UrlWindow;

use Doctrine\DBAL\Query\QueryBuilder;
use Doctrine\DBAL\Configuration;
use Doctrine\DBAL\DriverManager;

use Pagerfanta\Adapter\DoctrineDbalAdapter;
use Pagerfanta\Pagerfanta;
use Pagerfanta\View\DefaultView;

class Paginator {
  
    public function doctrine( $req, $res, $args) {


        $config = new Configuration();
        //..
        $connectionParams = array(
        'dbname' => 'test1',
        'user' => 'root',
        'password' => 'root',
        'host' => '127.0.0.1',
        'driver' => 'pdo_mysql',
                'charset'=>'UTF8',
        );
        $conn = DriverManager::getConnection($connectionParams, $config);
       
        //构造查询语句。
        $queryBuilder = new QueryBuilder($conn);
        $queryBuilder->select('p.*')->where("p.id < 100")->from('test_databases', 'p')
           ->orderBy("p.id","asc");
       
        $countQueryBuilderModifier = function ($queryBuilder) {
            $queryBuilder->select('COUNT(*) AS total_results')
                  ->setMaxResults(1);
        };
        $adapter = new DoctrineDbalAdapter($queryBuilder, $countQueryBuilderModifier);
        $pagerfanta = new Pagerfanta($adapter);
       
        $page = intval( $_GET["page"]);
        if (!$page) {
            $page=1;
        }
       
        //设置当前页，最大页面。
        $pagerfanta->setMaxPerPage(4)->setCurrentPage($page);
       
        //打印当前页面的结果
        foreach ($pagerfanta->getCurrentPageResults() as $v ) {
            echo $v['db_name'] .' = ' . $v['user_id']."<br>";
        }
       
        //打印分页链接。
        $routeGenerator = function($page) { // 匿名函数解决链接字符串
            return '/paginator/doctrine?page='.$page;
        };
        $view = new DefaultView();
        $options = array('proximity' => 3); // 这个数字干嘛用？中间的链接个数=这个数字*2+1，这个数字一般取3.
        $html = $view->render($pagerfanta, $routeGenerator, $options);
        echo $this->default_css();
        echo  "<div class='pagerfanta'>" .$html."</div>";
       
       
       
        return $res;
       
    }
   
    private function default_css()
    {
        $css=<<<css
        <style>
        .pagerfanta {
}

.pagerfanta a,
.pagerfanta span {
    display: inline-block;
    border: 1px solid blue;
    color: blue;
    margin-right: .2em;
    padding: .25em .35em;
}

.pagerfanta a {
    text-decoration: none;
}

.pagerfanta a:hover {
    background: #ccf;
}

.pagerfanta .dots {
    border-width: 0;
}

.pagerfanta .current {
    background: #ccf;
    font-weight: bold;
}

.pagerfanta .disabled {
    border-color: #ccf;
    color: #ccf;
}



.pagerfanta a,
.pagerfanta span {
    border-color: blue;
    color: blue;
}

.pagerfanta a:hover {
    background: #ccf;
}

.pagerfanta .current {
    background: #ccf;
}

.pagerfanta .disabled {
    border-color: #ccf;
    color: #cf;
}
        </style>
css;
        return $css;
    }
}
</pre>

效果展示