Question

我有一个问题，我需要帮助。基本上我试图从数据库查询信息到新闻 - 自动收报机样式类型的数组。我可以显示文本而不是图像，因为它是BLOB格式。我试图在PDO中编写代码，但我仍然是一个新手。我在这里阅读了很多关于获取blob图像并显示它们的文章。但是大多数文章都有关于弃用代码的说明。任何可以提供帮助的人都将不胜感激。这是我的源代码如下。

<style style="text/css">
.scroll-up {
 height: 500px; 
 width: 400px;
 overflow: hidden;
 position: relative;
 background: yellow;
 color: black;
 border: 1px solid black;
}
.scroll-up p {
 position: absolute;
 width: 400px;
 padding-right: 100%;
 height: 100%;
 margin: 0;
 line-height: 50px;
 text-align: center;
 /* Starting position */
 -moz-transform:translateY(100%);
 -webkit-transform:translateY(100%);    
 transform:translateY(100%);
 /* Apply animation to this element */  
 -moz-animation: scroll-up 20s linear infinite;
 -webkit-animation: scroll-up 20s linear infinite;
 animation: scroll-up 20s linear infinite;
}
.clones_wrapper {
 height: 500px; 
 width: 400px;
 overflow: hidden;
 position: relative;
 background: yellow;
 color: black;
 border: 1px solid black;
}


/* Move it (define the animation) */
@-moz-keyframes scroll-up {
 0%   { -moz-transform: translateY(100%); }
 100% { -moz-transform: translateY(-100%); }
}
@-webkit-keyframes scroll-up {
 0%   { -webkit-transform: translateY(100%); }
 100% { -webkit-transform: translateY(-100%); }
}
@keyframes scroll-up {
 0%   { 
 -moz-transform: translateY(100%); /* Browser bug fix */
 -webkit-transform: translateY(100%); /* Browser bug fix */
 transform: translateY(100%);       
 }
 100% { 
 -moz-transform: translateY(-100%); /* Browser bug fix */
 -webkit-transform: translateY(-100%); /* Browser bug fix */
 transform: translateY(-100%); 
 }
}
</style>

<div class="clones_wrapper">

<h2 align='center'>Clones</h2>

<table style = width:400px;><tr><th>Strain</th><th>Type</th><th>Rating</th><th>Price</th></tr></table>

<div class="scroll-up">
<p><?php


    echo "<table>";
    echo "<marquee  behavior='scroll', direction='up'></marquee>";

    class TableRows extends RecursiveIteratorIterator { 
    function __construct($it) { 
        parent::__construct($it, self::LEAVES_ONLY); 
    }

    function current() {
        return "<td align='center' style='width:150px;'>" . parent::current(). "</td>";
    }

    function beginChildren() { 
        echo "<tr>"; 
    } 

    function endChildren() { 
        echo "</tr>" . "\n";
    }

} 

$servername = "localhost";
$username = "root";
$password = "";
$dbname = "clonemenudb";

try {
    $conn = new PDO("mysql:host=$servername;dbname=clonemenudb", $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $stmt = $conn->prepare("SELECT strain, type, imagefile, price FROM clones_db"); 
    $stmt->execute();   


    // set the resulting array to associative
    $result = $stmt->setFetchMode(PDO::FETCH_ASSOC); 
    foreach(new TableRows(new RecursiveArrayIterator($stmt->fetchAll())) as $k=>$v) { 
        echo $v;
    }


}
catch(PDOException $e) {
    echo "Error: " . $e->getMessage();
}
$conn = null;
echo "</table>";

?>


</p>

    </div>
</div>

Answer 1

using System;
using System.Collections.Generic;
using System.Linq;

namespace Test
{
    class Program
    {
        static void Main(string[] args)
        {
            var fullList = new List<object> { 1, "bob2", "bob3", 4 };

            var subsetOfFullList = new HashSet<object> { fullList[3], fullList[1] };

            IReadOnlyList<object> filteredList = fullList.Where(z => subsetOfFullList.Contains(z)).ToList();

            Console.WriteLine(string.Join(",", filteredList));
            Console.ReadLine();
        }
    }
}

如何在递归数组中显示blob图像？

1 个答案: