[英]Recursively find nested active record relations in Yii
假設您具有如下所示的關系,並且想要查找給定客戶下的所有帳戶:
- Customer 1
- accounts
- Account 1
- customers
- Customer 2
- accounts
- Account 2
- Account 3
- Customer 3
- customers
- Customer 4
- accounts
- Account 4
- Account 5
(對於客戶1,它是帳戶1、2、3、4和5;對於客戶3,它是帳戶4和5;等等。)
你會怎么做?
這在我的項目中已經出現過幾次了,我很好奇其他人如何解決它。
<?php
public function getNestedRelated($nested, $from, $nestedCriteria = array(), $fromCriteria = array(), $maxLevels = false, $includeFirst = true, $_currentLevel = 0, &$_recursedSoFar = array())
{
// Always return an array (for array_merge)
$related = array();
// Prevent infinite recursion
if (in_array($this->primaryKey, $_recursedSoFar)) {
return $related;
}
$_recursedSoFar[] = $this->primaryKey;
// Nested records at this level
if ($_currentLevel > 0 || $includeFirst) {
// Whether to refresh nested records at this level. If criteria are
// provided, the db is queried anyway.
$refreshNested = false;
$related = $this->getRelated($nested, $refreshNested, $nestedCriteria);
}
// Handle singular ("HAS_ONE", "BELONGS_TO") relations
if (!is_array($related)) {
$related = array($related);
}
// Don't recurse past the max # of levels
if ($maxLevels !== false && $_currentLevel > $maxLevels) {
return $related;
}
// Whether to refresh children of this record. If criteria are provided,
// the db is queried anyway.
$refreshFrom = false;
// Go down one more level
$_currentLevel++;
foreach ($this->getRelated($from, $refreshFrom, $fromCriteria) as $child) {
// Recursive step
$nestedRelated = $child->getNestedRelated($nested, $from, $nestedCriteria, $fromCriteria, $maxLevels, $includeFirst, $_currentLevel, $_recursedSoFar);
$related = array_merge($related, $nestedRelated);
}
return $related;
}
您是否考慮過使用預購功能一次性獲得所有詳細信息? 如果有可能,將帳戶和客戶都保留在1個表中,那么1個帶有預購的查詢實際上將獲得您需要的一切。
如果您將客戶和帳戶保留在2個不同的表中,我相信您仍然可以使用預訂來最大程度地減少查詢的次數。
我在Yii中使用了這個擴展名,也可以使事情保持預定狀態,這非常不錯http://www.yiiframework.com/extension/nestedsetbehavior/
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.