3

我有两个表，table1并且table2通过多对多连接。到目前为止没有问题，但我会因为在生产使用中使用下面的代码而导致服务器崩溃。访问多对多连接会产生很多查询。

有没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 查询日志：

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"
  [...]
4

1 回答 1

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'

代替

'sharedPage|page'):

更多详情可在这找到：

http://www.redbeanphp.com/eager_loading

于 2013-09-23T18:19:06.523 回答