用 Zend_Db_Table_Abstract 对 WHERE 子句进行分组

Question

有人知道用 Zend_Db 对 where 子句进行分组的方法吗？基本上我有这个查询

$sql = $table->select()
             ->where('company_id = ?', $company_id)
             ->where('client_email = ?', $client_email)
             ->orWhere('client_email_alt = ?', $client_email);

这是给我的：

SELECT `clients`.* FROM `clients` WHERE (company_id = '1') AND (client_email = 'email@address.com') OR (client_email_alt = 'email@address.com')

但我需要它给我这个，OR 语句被分组的地方：

SELECT `clients`.* FROM `clients` WHERE (company_id = '1') AND ((client_email = 'email@address.com') OR (client_email_alt = 'email@address.com'))

Answer 1

我需要组合 AND/OR 语句，但有条件地包括 OR 语句，仅在某些情况下添加它们。这个解决方案是对我所做的事情的改编，基于对已接受答案的小修改。

$sql = $table->select()
         ->where('company_id = ?', $company_id);

$orWhereClauses = [];
// We could add a conditional statement to add this statement
$orWhereClauses[] = $db->quoteInto('client_email = ?', $email1);
// Same applies to this statement
$orWhereClauses[] = $db->quoteInto('client_email_alt = ?', $email2);

$sql->where(implode(" OR ", $orWhereClauses));

Answer 2

首先您可以生成子查询，然后获取“WHERE”部分并插入到主查询中

$subquery = $db->select();
$subquery->orWhere('a>10');
$subquery->orWhere('b<20');
etc..

$subquery = $subquery->getPart(Zend_Db_Select::WHERE);
$select->where(implode(' ',$subquery));

Answer 3

对于 Zend Framework 第 2 版，情况有所不同：

见http://framework.zend.com/apidoc/2.2/classes/Zend.Db.Sql.Predicate.Predicate.html#nest

$table->select()
     ->where(['company_id'=> $company_id])
     ->nest
         ->where('client_email = ?', $client_email)
         ->or
         ->where('client_email_alt = ?', $client_email)
     ->unnest();

工作正常，感觉比 ZF1 方法干净得多。

Answer 4

您可以使用getPart()获取WHERE语句，然后连接子查询。

$select->where('client_email = ?', $client_email)
       ->orWhere('client_email_alt = ?', $client_email);

$subquery = $select->getPart(Zend_Db_Select::WHERE);
$select ->reset(Zend_Db_Select::WHERE);
$select ->where('company_id = ?', $company_id)
        ->where(implode(' ',$subquery));

Answer 5

为了实现这一点，您必须在对where 方法的一次调用中构造分组子句。

如果两个条件值相同，可以这样做：

$select->where('client_email = ? OR client_email_alt = ?', $client_email)

如果字符串中有多个占位符，DB 适配器的quoteInto 方法会将所有占位符替换为提供的值。

如果您需要将OR 与每个字段的不同值分组，您必须手动引用这些值。这有点复杂：

$select->where(
    $db->quoteInto('client_email = ?', $email1) . ' OR ' . $db->quoteInto('client_email_alt = ?', $email2)
); // $db is your instance of Zend_Db_Adapter_*
   // You can get it from a Zend_Db_Table_Abstract 
   //subclass by calling its getAdapter() method