如何從數組更新表格？

Question

$query = "SELECT users FROM tabl ORDER BY RAND()"; 
$result = mysql_query ($query) 
    or die ("Query '$query' failed with error message: \"" . mysql_error() . '"'); 

while ($row = mysql_fetch_array($result)) { 
    $users[] = $row[0]; 
} 

$current = end($users); 
$partners = array(); 
foreach ($users as $user) 
{ 
     $partners[$user] = $current; 
     $current = $user; 
} 
print_r($partners); 

$query2 = "UPDATE tabl SET partner = {$partners[0]} WHERE users = '$users'"; 
mysql_query ($query2) 
    or die ("<br>Query '$query2' failed with error message: \"" . mysql_error() . '"'); 

這就是我正在使用的代碼。在query2之前一切都很好。我試過了我能想到的所有變化，但沒有任何效果。

表上有兩個字段：用戶和合作夥伴。代碼以隨機順序拉取用戶，然後將它們分配給彼此成圈。我需要使用作業來填充合作伙伴字段。

Answer 1

廣場foreach循環內更新查詢，那麼你的合作伙伴和用戶變量，而跳水手入陣以後：

foreach ($users as $user) 
{ 
     $partners[$user] = $current; 
     $current = $user; 
     $query2 = "UPDATE tabl SET partner = '{$partners[$user]}' WHERE users = '{$user}'"; 
     mysql_query ($query2) 
      or die ("<br>Query '$query2' failed with error message: \"" . mysql_error() 
} 

Answer 2

使用WHERE users IN ('.implode(',',$users).')'

Answer 3

我的代碼更改：

$current = end($users); 
$partners = array(); 
foreach ($users as $user) 
{ 
    $partners[$user] = $current; 
    $current = $user; 
    $query2 = "UPDATE tabl SET partner = {$partners[$user]} WHERE users = '$user'"; 
    mysql_query ($query2) 
     or die ("<br>Query '$query2' failed with error message: \"" . mysql_error() . '"'); 
} 
print_r($partners); 

但你也可以做取決於你想要的結果如下：

$userList = join(',', $users); 
$query2 = "UPDATE tabl SET partner = {$partners[0]} WHERE users IN ($userList)"; 
mysql_query ($query2) 
    or die ("<br>Query '$query2' failed with error message: \"" . mysql_error() . '"');