Wordpress如何从数据库中获取记录

Question

我正在同时从两个 table 中获取记录。

一个是问题table
另一个是选项table

每个问题都有很多选项，我是运行下面的代码，但它什么也没回显，没有错误，没有结果。

<div class="container">
      <div class="row">

    <div class="col-sm-3">
<div class="questions">
<?php
$results = $wpdb->get_results( "SELECT * FROM wp_dbquestions"); // Query to fetch data from database table and storing in $results
if(!empty($results))                        // Checking if $results have some values or not
{ 
    echo"<p>$results->text</p>";
     }
     $results1 = $wpdb->get_results( "SELECT * FROM wp_questoptions WHERE question_id=1"); // Query to fetch data from database table and storing in $results
if(!empty($results1)) { 
    foreach($results1 as $row){ 
   echo"<form class="options">";
        echo"<input class="option" type="radio">$row->text <br>";
        echo"<input class="option" type="hidden">$row->score <br>";
    echo"</form>";
   }
?>
</div>

</div>
</div>
</div>

Answer 1

虽然 testing/debugging 你可以添加这个

<?php
    error_reporting(E_ALL);
    ini_set('display_errors', 1);
?>

在您的 php 文件之上查看所有错误。

如果您想使用 Wordpress 数据库，您必须 "declare $wpdb as a global variable using the global keyword, or use the superglobal $GLOBALS"

// 1st Method - Declaring $wpdb as global and using it to execute an SQL query statement that returns a PHP object

global $wpdb;
$results = $wpdb->get_results( "SELECT * FROM {$wpdb->prefix}options WHERE option_id = 1", OBJECT );

// 2nd Method - Utilizing the $GLOBALS superglobal. Does not require global keyword ( but may not be best practice )

$results = $GLOBALS['wpdb']->get_results( "SELECT * FROM {$wpdb->prefix}options WHERE option_id = 1", OBJECT );

发件人：

https://codex.wordpress.org/Class_Reference/wpdb

Wordpress如何从数据库中获取记录

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