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PHP PDO，不包括具有空字段值的行

[英]PHP PDO, excluding row with null field value

 原文  2017-02-25 01:41:20  8   2    php/ mysql

问题描述

So I am using this sample code output6.php 所以我使用这个示例代码output6.php

What I would like to do is if empire_name returns null, skip the associated row Any ideas or suggestions would be appreciated Thanks! 我想做的是，如果empire_name返回null，跳过相关的行任何想法或建议将不胜感激谢谢！ 

<!DOCTYPE html>
<html>
<body>

<?php
echo "<table style='border: solid 1px black;'>";
  echo "<tr>
    <th>Empire Name</th>
    <th>Win?</th>
    <th>Building 1</th>
    <th>Building 2</th>
    <th>Building 3</th>
    <th>Building 4</th>
    <th>Building 5</th>
    <th>Building 6</th>
    <th>Building 7</th>
    <th>Building 8</th>
    <th>Building 9</th>
    </tr>";

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

     function current() {
         return "<td style='width: 150px; border: 1px solid black;'>" . parent::current(). "</td>";
     }

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

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

$servername = "xxx";
$username = "xxx";
$password = "xxx";
$dbname = "xxx";

try {
     $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
     $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
     $stmt = $conn->prepare("SELECT empire_name, win, building_1, building_2, building_3, building_4, building_5, building_6, building_7, building_8, building_9 FROM ft_form_2 "); 
     $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>";
?>  

</body>
</html>

I tried looking this up but I don't know enough to know what to look for 我试着查看这个，但我不知道该知道要找什么

thanks! 谢谢！

my current results null = blank rows, image link 我当前的结果null =空行，图片链接

I think this is close... PDO and IS NOT NULL Function But I am not sure how to implement in the current code (I tried a few variations) 我认为这很接近... PDO和IS NOT NULL功能但是我不确定如何在当前代码中实现（我尝试了一些变体）

A different variation - same results (output3.php) closer to the desired end result 一个不同的变化 - 相同的结果（output3.php）更接近期望的最终结果 

<?php
define("DB_HOST", "xxx");    // Using Constants
define("DB_USER", "xxx");
define("DB_PASS", "xxx");
define("DB_NAME", "xxx");

try {       // << using Try/Catch() to catch errors!

$dbc = new PDO("mysql:host=".DB_HOST.";dbname=".DB_NAME.";charset-utf8",DB_USER,DB_PASS);
}catch(PDOException $e){ echo $e->getMessage();}

if($dbc <> true){
    die("<p>There was an error</p>");
}

$print = ""; // assign an empty string 

$stmt = $dbc->query("SELECT * FROM ft_form_2"); // fetch data
$stmt->setFetchMode(PDO::FETCH_OBJ);

if($stmt->execute() <> 0)
{

    $print .= '<table border="1px">';
    $print .= '<tr><th>Empire_Name</th>';
    $print .= '<th>Win</th>';
    $print .= '<th>Building_1</th>';
    $print .= '<th>Building_2</th>';
    $print .= '<th>Building_3</th>';
    $print .= '<th>Building_4</th>';
    $print .= '<th>Building_5</th>';
    $print .= '<th>Building_6</th>';
    $print .= '<th>Building_7</th>';
    $print .= '<th>Building_8</th>';
    $print .= '<th>Building_9</th> </tr>';

    while($ft_form_2 = $stmt->fetch()) // loop and display data
    {

        $print .= '<tr>';
        $print .= "<td>{$ft_form_2->empire_name}</td>";
        $print .= "<td>{$ft_form_2->win}</td>";
        $print .= "<td>{$ft_form_2->building_1} <br> {$ft_form_2->building_1_notes} </td>";
        $print .= "<td>{$ft_form_2->building_2} <br> {$ft_form_2->building_2_notes} </td>";
        $print .= "<td>{$ft_form_2->building_3} <br> {$ft_form_2->building_3_notes} </td>";
        $print .= "<td>{$ft_form_2->building_4} <br> {$ft_form_2->building_4_notes} </td>";
        $print .= "<td>{$ft_form_2->building_5} <br> {$ft_form_2->building_5_notes} </td>";
        $print .= "<td>{$ft_form_2->building_6} <br> {$ft_form_2->building_6_notes} </td>";
        $print .= "<td>{$ft_form_2->building_7} <br> {$ft_form_2->building_7_notes} </td>";
        $print .= "<td>{$ft_form_2->building_8} <br> {$ft_form_2->building_8_notes} </td>";
        $print .= "<td>{$ft_form_2->building_9} <br> {$ft_form_2->building_9_notes} </td>";
        $print .= '</tr>';
    }

    $print .= "</table>";
    echo $print;
}
?>

2 个解决方案

解决方案1
 1  2017-02-25 03:05:18

To follow your logic of using IS NOT NULL you mentioned in your question. 遵循您在问题中提到的使用IS NOT NULL的逻辑。 You were on the right path. 你是在正确的道路上。 Returning just what you are looking for from the database is way more efficient then getting everything and filtering it in PHP. 从数据库中返回正在寻找的东西比获取所有内容并在PHP中过滤它更有效。

Your statement here 你在这里的陈述 

$stmt = $conn->prepare("SELECT empire_name, win, building_1, building_2, building_3, building_4, building_5, building_6, building_7, building_8, building_9 FROM ft_form_2 ");

you can add a where condition at the end 你可以在最后添加where条件 

$stmt = $conn->prepare("SELECT empire_name, win, building_1, building_2, building_3, building_4, building_5, building_6, building_7, building_8, building_9 FROM ft_form_2 WHERE empire_name IS NOT NULL ");

Then your database will be doing the filtering. 然后你的数据库将进行过滤。 The same can be applied to your second example as well. 同样可以应用于您的第二个示例。 

$stmt = $dbc->query("SELECT * FROM ft_form_2 WHERE empire_name IS NOT NULL");

解决方案2
 -1 已采纳  2017-02-25 02:07:51

Simple add check before printing rows. 在打印行之前简单添加检查。 Something like following. 跟随之类的事情。 

while($ft_form_2 = $stmt->fetch()) // loop and display data
{
    if( !empty($ft_form_2->empire_name) && !is_null($ft_form_2->empire_name) )
    {
        $print .= '<tr>';
        $print .= "<td>{$ft_form_2->empire_name}</td>";
        $print .= "<td>{$ft_form_2->win}</td>";
        $print .= "<td>{$ft_form_2->building_1} <br> {$ft_form_2->building_1_notes} </td>";
        $print .= "<td>{$ft_form_2->building_2} <br> {$ft_form_2->building_2_notes} </td>";
        $print .= "<td>{$ft_form_2->building_3} <br> {$ft_form_2->building_3_notes} </td>";
        $print .= "<td>{$ft_form_2->building_4} <br> {$ft_form_2->building_4_notes} </td>";
        $print .= "<td>{$ft_form_2->building_5} <br> {$ft_form_2->building_5_notes} </td>";
        $print .= "<td>{$ft_form_2->building_6} <br> {$ft_form_2->building_6_notes} </td>";
        $print .= "<td>{$ft_form_2->building_7} <br> {$ft_form_2->building_7_notes} </td>";
        $print .= "<td>{$ft_form_2->building_8} <br> {$ft_form_2->building_8_notes} </td>";
        $print .= "<td>{$ft_form_2->building_9} <br> {$ft_form_2->building_9_notes} </td>";
        $print .= '</tr>';
    }
}

Or 要么

You can add WHERE cause in your query. 您可以在查询中添加WHERE原因。 Like following 喜欢以下 

 WHERE empire_name IS NOT NULL AND empire != ''

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