每當我有複雜的查詢處理,我通常會盡量在MySQL運行。一旦我找到了確切的SQL語句,我就開始將它翻譯成Zend。我看起來有點複雜,但從長遠來看,你可以馬上在Zend做他們。這是我如何分解它。 首先弄清楚該SQL語句是什麼:現在
SELECT t.plural_name, p.name as users_name, u.ID
FROM users u, profile p, relationships r, relationship_types t
WHERE t.ID=r.type AND r.accepted=1 AND
(r.usera={$user} OR r.userb={$user}) AND
IF(r.usera={$user},u.ID=r.userb,u.ID=r.usera) AND
p.user_id=u.ID
,你會希望所有加入的關係轉換。這些連接在開始時有點嚇人,但它只是一種將表格和它連接到另一個表格的條件的方法。現在
SELECT t.plural_name, p.name AS users_name, u.ID
FROM users u
INNER JOIN profile AS p ON p.user_id = u.ID
INNER JOIN relationships AS r ON IF(r.usera={$user}, u.ID=r.userb, u.ID=r.usera)
INNER JOIN relationship_types AS t ON t.ID = r.type
WHERE
(r.usera={$user} OR r.userb={$user}) AND
r.accepted=1
,這是寫在一個更「友好的Zend」的方式,你可以輕鬆地開始將其轉換爲Zend公司:
$select = $this->select()->setIntegrityCheck(false);
$select->from(array('u'=>'users'), '');
$select->join(array('p'=>'profile'), 'p.user_id = u.ID', '');
$select->join(array('r'=>'relationships'), 'IF(r.usera={$user}, u.ID=r.userb, u.ID=r.usera)', '');
$select->join(array('t'=>'relationship_types'), 't.ID = r.type', '');
$select->columns(array(
't.plural_name',
'users_name'=>'p.name',
'u.ID'));
$select->where('r.usera={$user}');
$select->orWhere('r.userb={$user}');
$select->where('r.accepted=1');
和應做的工作。
$ select-> where('r.usera = {$ user}'); ('r'=>'relationships'),'IF(r.usera = {$ user},u.ID = r.userb,u.ID = r.usera)', '');這兩個重疊嗎? – Yangrui 2012-07-12 06:46:37