Question

我有两个表，table1和table2，通过多对多连接。到目前为止没有任何问题，但我会因为生产性使用中的代码而使服务器崩溃。访问多对多连接会产生很多查询。

是否有更好的方法来访问数据（没有原始查询）？

代码：

<?php
$table1_entry = R::findAll('table1');
foreach($table1_entry as $table1)
{
    echo $table1->id;
    foreach($table1->sharedTable2 as $table2)
    {
        echo $table2->id;
    }
}
?>

Redbean Query-Log：

string(34) "SELECT * FROM `table1` -- keep-cache"
  [1] =>
  string(71) "SELECT * FROM `table2_table1` WHERE ( `table1_id`  IN ( ?)  )  -- keep-cache"
  [2] =>
  string(61) "SELECT * FROM `table2` WHERE ( `id`  IN ( 1)  )  -- keep-cache"
  [3] =>
  string(71) "SELECT * FROM `table2_table1` WHERE ( `table1_id`  IN ( ?)  )  -- keep-cache"
  [4] =>
  string(61) "SELECT * FROM `table2` WHERE ( `id`  IN ( 2)  )  -- keep-cache"
  [5] =>
  string(71) "SELECT * FROM `table2_table1` WHERE ( `table1_id`  IN ( ?)  )  -- keep-cache"
  [6] =>
  string(61) "SELECT * FROM `table2` WHERE ( `id`  IN ( 3)  )  -- keep-cache"
  [7] =>
  string(71) "SELECT * FROM `table2_table1` WHERE ( `table1_id`  IN ( ?)  )  -- keep-cache"
  [8] =>
  string(61) "SELECT * FROM `table2` WHERE ( `id`  IN ( 4)  )  -- keep-cache"
  [...]

Answer 1

解决方案：

//Create some pages and ads
list($ad1, $ad2) = R::dispense('ad', 2);
list($page1, $page2, $page3) = R::dispense('page',3);
$ad1->sharedPage = array($page1, $page2);
$ad2->sharedPage[] = $page3;
R::storeAll(array($ad1, $ad2));

//to check
R::debug(1);

//Now given the ads 
R::each(R::find('ad'), 'sharedPage|page',function($ad, $pages){
  foreach($pages as $page) echo "\n AD {$ad->id} -> PAGE {$page->id} ";
});

请注意，在RedBeanPHP中，您必须使用

'sharedPage'=>'page'

而不是

'sharedPage|page'):

更多细节可以在这里找到：

http://www.redbeanphp.com/eager_loading

在没有多少查询的情况下访问Redbean多对多条目？

代码：

Redbean Query-Log：

1 个答案: