数据库查询retuyrns领域的一个订单，我想在另一个

，以显示他们这大概已经回答了（或者应该是基础知识），所以请原谅noob问题...数据库查询retuyrns领域的一个订单，我想在另一个

我使用的WP user_meta数据库来存储用户的高级属性。

数据存储在这个顺序（这是所有用户ID = 15）：

city = Altoona 
state = PA 
phone = 9999999999 
name = Fred 

I want to generate the output as 
Fred, Altoona, PA, 9999999999

下面是相关的PHP代码：

$my_exportlist = $wpdb->get_results("SELECT `user_id` FROM `wp_m_membership_relationships` WHERE `level_id` = '2' "); 
foreach ($my_exportlist as $duser) { 

$my_stationinfo = $wpdb->get_results("SELECT * FROM `wp_usermeta` WHERE `meta_key` IN ('name', 'city', 'state', 'office') AND user_id ='$duser->user_id'"); 

foreach ($my_stationinfo as $myinfo) { 
    $csv_output .= $myinfo->meta_value . ","; 
    } 
$csv_output .= "\n"; 
}

我这样做的第一个答案后：

$my_stationinfo = $wpdb->get_results("GROUP_CONCAT(meta_value) val_output 
     FROM `wp_usermeta` 
     WHERE `meta_key` IN ('name', 'city', 'state', 'office') AND user_id ='$duser->user_id' 
     ORDER BY FIELD(meta_key, 'name', 'city', 'state', 'office'");

我收到此错误消息...

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'GROUP_CONCAT(meta_value) val_output FROM `wp_usermeta` WHERE `meta_key' at line 1]

看着那数q/a和链接的MySQL的instrucitons后，我还是百思不得其解....

而且后续：这是当前的代码

$my_exportlist = $wpdb->get_results("SELECT `user_id` FROM `wp_m_membership_relationships` WHERE `level_id` = '2' "); 
foreach ($my_exportlist as $duser) { 

$my_stationinfo = $wpdb->get_results(
    "SELECT GROUP_CONCAT(meta_value) val_output 
     FROM wp_usermeta 
     WHERE meta_key IN ('primary_calls', 'city', 'state', 'office', 'contact_emerg', 'contact_routine', 'contact_backup', 'contact_billing', 'contact_eng', 'contact_web', 'contact_prod', 'contact_traffic') AND 
       user_id = '$duser->user_id' 
       ORDER BY FIELD(meta_key, 'primary_calls', 'city', 'primary_calls','state', 'office', 'contact_emerg', 'contact_routine', 'contact_backup', 'contact_billing', 'contact_eng', 'contact_web', 'contact_prod', 'contact_traffic')"); 
print_r($my_stationinfo); 
var_dump($my_stationinfo); 
echo $my_stationinfo->val_output[0] ; 


foreach ($my_stationinfo as $myinfo) { 

    $csv_output .= $myinfo; 
} 
$csv_output .= "\n";

结果：

Array ([0] => stdClass Object ([val_output] => Altoona,PA,814.943.8112,WRTA)) 


array 
    0 => 
    object(stdClass)[5] 
     public 'val_output' => string 'Altoona,PA,814.943.8112,WRTA' (length=28) 


Notice: Trying to get property of non-object in D:\Users\Dev\Documents\Websites\contract.dev\wp-content\plugins\custom_plugin\index_page.php on line 40 

Catchable fatal error: Object of class stdClass could not be converted to string in D:\Users\Dev\Documents\Websites\contract.dev\wp-content\plugins\custom_plugin\index_page.php on line 45

来源

2013-09-27 Scott_Roberts

使用GROUP_CONCAT()

SELECT GROUP_CONCAT(meta_value) val_output 
FROM wp_usermeta 
WHERE meta_key IN ('name', 'city', 'state', 'office') AND 
     user_id = '$duser->user_id' 
ORDER BY FIELD(meta_key, 'name', 'city', 'state', 'office')

MySQL GROUP_CONCAT()

来源

2013-09-27 19:46:07

仍然抓我的头就这一个...我张贴新的代码和错误消息的原始邮件。在查看您提供的链接以及与GROUP_CONCAT –

相关的其他几项搜索后，我仍然感到困惑，其中“GROUP_CONCAT”之前的“SELECT”关键字在哪里？ –

'SELECT GROUP_CONCAT（meta_value）val_output ........' –

数据库查询retuyrns领域的一个订单，我想在另一个

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