如何在 WordPress 前端显示带有简码的 SQL 查询答案

【问题标题】：How to display a SQL querie with a shortcode to the WordPress frontend如何在 WordPress 前端显示带有简码的 SQL 查询
【发布时间】：2020-02-06 12:22:47
【问题描述】：

我将 Wordpress 与 WooCommerce 一起使用。某些订单不仅应该在后端可见，还应该在前端可见。

现在我创建了一个 SQL 查询（在 phpMyAdmin 中工作）。结果应显示在网站上的表格中。

SELECT
            p.ID as order_id,
            p.post_date,
            max( CASE WHEN pm.meta_key = 'donateAnonym' AND p.ID = pm.post_id THEN pm.meta_value END ) as donateAnonym,
            max( CASE WHEN pm.meta_key = '_billing_email' AND p.ID = pm.post_id THEN pm.meta_value END ) as billing_email,
            max( CASE WHEN pm.meta_key = '_billing_first_name' AND p.ID = pm.post_id THEN pm.meta_value END ) as _billing_first_name,
            max( CASE WHEN pm.meta_key = '_billing_last_name' AND p.ID = pm.post_id THEN pm.meta_value END ) as _billing_last_name,
            max( CASE WHEN pm.meta_key = '_billing_city' AND p.ID = pm.post_id THEN pm.meta_value END ) as _billing_city,
            max( CASE WHEN pm.meta_key = '_billing_state' AND p.ID = pm.post_id THEN pm.meta_value END ) as _billing_state,
            max( CASE WHEN pm.meta_key = '_order_total' AND p.ID = pm.post_id THEN pm.meta_value END ) as order_total,
            ( SELECT GROUP_CONCAT( order_item_name separator '|' ) FROM wp_woocommerce_order_items WHERE order_id = p.ID ) as order_items
        FROM
            wp_posts p 
            JOIN wp_postmeta pm on p.ID = pm.post_id
            JOIN wp_woocommerce_order_items oi on p.ID = oi.order_id
        GROUP BY
            p.ID

我将此代码添加到我的主题的functions.php 文件中。现在可以通过将[showAllHrOrdersTable] 添加到任何页面或帖子来显示来自该功能的信息。

add_shortcode( 'showAllHrOrdersTable', 'showAllHrOrders' );

function showAllHrOrders( $args ) {

    $SQLstring = 'SELECT
            p.ID as order_id,
            p.post_date,
            max( CASE WHEN pm.meta_key = 'donateAnonym' AND p.ID = pm.post_id THEN pm.meta_value END ) as donateAnonym,
            max( CASE WHEN pm.meta_key = '_billing_email' AND p.ID = pm.post_id THEN pm.meta_value END ) as billing_email,
            max( CASE WHEN pm.meta_key = '_billing_first_name' AND p.ID = pm.post_id THEN pm.meta_value END ) as _billing_first_name,
            max( CASE WHEN pm.meta_key = '_billing_last_name' AND p.ID = pm.post_id THEN pm.meta_value END ) as _billing_last_name,
            max( CASE WHEN pm.meta_key = '_billing_city' AND p.ID = pm.post_id THEN pm.meta_value END ) as _billing_city,
            max( CASE WHEN pm.meta_key = '_billing_state' AND p.ID = pm.post_id THEN pm.meta_value END ) as _billing_state,
            max( CASE WHEN pm.meta_key = '_order_total' AND p.ID = pm.post_id THEN pm.meta_value END ) as order_total,
            ( SELECT GROUP_CONCAT( order_item_name separator '|' ) FROM wp_woocommerce_order_items WHERE order_id = p.ID ) as order_items
        FROM
            wp_posts p 
            JOIN wp_postmeta pm on p.ID = pm.post_id
            JOIN wp_woocommerce_order_items oi on p.ID = oi.order_id
        GROUP BY
            p.ID';

    global $wpdb;

    $content = '<table>';
    $content .= '</tr><th>Family</th>';
        $content .= '<th>Name</th>';
        $content .= '<th>City</th></tr>';
    $results = $wpdb->get_results( $SQLstring );

    foreach ( $results AS $row ) {
        $content .= '<tr><td>' . $row->_billing_first_name . '</td>';
            $content .= '<td>' . $row->_billing_last_name . '</td>';
            $content .= '<td>' . $row->_billing_city . '</td></tr>';
    }
    $content .= '</table>';

    return $content;
}

问题：当我使用快捷方式上传并启动页面时，出现以下错误：

Parse error: syntax error, unexpected 'donateAnonym' (T_STRING) in .../themes/.../functions.php

注意事项：当我将 SQLString 更改为 SELECT * FROM ... 时，错误消失了，但一些重要的列（例如 donateAnonym）会丢失。

add_shortcode( 'showAllHrOrdersTable', 'showAllHrOrders' );

function showAllHrOrders( $args ) {

    $SQLstring = 'SELECT *
        FROM
            wp_posts p 
            JOIN wp_postmeta pm on p.ID = pm.post_id
            JOIN wp_woocommerce_order_items oi on p.ID = oi.order_id
        GROUP BY
            p.ID';

    global $wpdb;

    $content = '<table>';
    $content .= '</tr><th>Family</th>';
        $content .= '<th>Name</th>';
        $content .= '<th>City</th></tr>';
    $results = $wpdb->get_results( $SQLstring );

    foreach ( $results AS $row ) {
        $content .= '<tr><td>' . $row->_billing_first_name . '</td>';
            $content .= '<td>' . $row->_billing_last_name . '</td>';
            $content .= '<td>' . $row->_billing_city . '</td></tr>';
    }
    $content .= '</table>';

    return $content;
}

如何实现我的 sql 查询而不出现任何错误？

【问题讨论】：

标签： php sql wordpress

【解决方案1】：

您忘记在$SQLstring 中转义引号：

$SQLstring = 'SELECT
            p.ID as order_id,
            p.post_date,
            max( CASE WHEN pm.meta_key = \'donateAnonym\' AND p.ID = pm.post_id THEN pm.meta_value END ) as donateAnonym,
            max( CASE WHEN pm.meta_key = \'_billing_email\' AND p.ID = pm.post_id THEN pm.meta_value END ) as billing_email,
            max( CASE WHEN pm.meta_key = \'_billing_first_name\' AND p.ID = pm.post_id THEN pm.meta_value END ) as _billing_first_name,
            max( CASE WHEN pm.meta_key = \'_billing_last_name\' AND p.ID = pm.post_id THEN pm.meta_value END ) as _billing_last_name,
            max( CASE WHEN pm.meta_key = \'_billing_city\' AND p.ID = pm.post_id THEN pm.meta_value END ) as _billing_city,
            max( CASE WHEN pm.meta_key = \'_billing_state\' AND p.ID = pm.post_id THEN pm.meta_value END ) as _billing_state,
            max( CASE WHEN pm.meta_key = \'_order_total\' AND p.ID = pm.post_id THEN pm.meta_value END ) as order_total,
            ( SELECT GROUP_CONCAT( order_item_name separator \'|\' ) FROM wp_woocommerce_order_items WHERE order_id = p.ID ) as order_items
        FROM
            wp_posts p 
            JOIN wp_postmeta pm on p.ID = pm.post_id
            JOIN wp_woocommerce_order_items oi on p.ID = oi.order_id
        GROUP BY
            p.ID';

更好，更易读：

$SQLstring = "SELECT
            p.ID as order_id,
            p.post_date,
            max( CASE WHEN pm.meta_key = 'donateAnonym' AND p.ID = pm.post_id THEN pm.meta_value END ) as donateAnonym,
            max( CASE WHEN pm.meta_key = '_billing_email' AND p.ID = pm.post_id THEN pm.meta_value END ) as billing_email,
            max( CASE WHEN pm.meta_key = '_billing_first_name' AND p.ID = pm.post_id THEN pm.meta_value END ) as _billing_first_name,
            max( CASE WHEN pm.meta_key = '_billing_last_name' AND p.ID = pm.post_id THEN pm.meta_value END ) as _billing_last_name,
            max( CASE WHEN pm.meta_key = '_billing_city' AND p.ID = pm.post_id THEN pm.meta_value END ) as _billing_city,
            max( CASE WHEN pm.meta_key = '_billing_state' AND p.ID = pm.post_id THEN pm.meta_value END ) as _billing_state,
            max( CASE WHEN pm.meta_key = '_order_total' AND p.ID = pm.post_id THEN pm.meta_value END ) as order_total,
            ( SELECT GROUP_CONCAT( order_item_name separator '|' ) FROM wp_woocommerce_order_items WHERE order_id = p.ID ) as order_items
        FROM
            wp_posts p 
            JOIN wp_postmeta pm on p.ID = pm.post_id
            JOIN wp_woocommerce_order_items oi on p.ID = oi.order_id
        GROUP BY
            p.ID";

【讨论】：