每当我有复杂的查询处理,我通常会尽量在MySQL运行。一旦我找到了确切的SQL语句,我就开始将它翻译成Zend。我看起来有点复杂,但从长远来看,你可以马上在Zend做他们。这是我如何分解它。 首先弄清楚该SQL语句是什么:现在
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={$user},u.ID=r.userb,u.ID=r.usera) AND
p.user_id=u.ID
,你会希望所有加入的关系转换。这些连接在开始时有点吓人,但它只是一种将表格和它连接到另一个表格的条件的方法。现在
SELECT t.plural_name, p.name AS users_name, u.ID
FROM users u
INNER JOIN profile AS p ON p.user_id = u.ID
INNER JOIN relationships AS r ON IF(r.usera={$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
,这是写在一个更“友好的Zend”的方式,你可以轻松地开始将其转换为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');
和应做的工作。
$ select-> where('r.usera = {$ user}'); ('r'=>'relationships'),'IF(r.usera = {$ user},u.ID = r.userb,u.ID = r.usera)', '');这两个重叠吗? – Yangrui 2012-07-12 06:46:37