Grouping WHERE clauses with Zend_Db_Table_Abstract

问题:

Does anyone know of a way to group where clauses with Zend_Db? Basically I have this query

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

Which is giving me this:

SELECT `clients`.* FROM `clients` WHERE (company_id = '1') AND (client_email = '[e-mail]') OR (client_email_alt = '[e-mail]')

But I need it to give me this, where the OR statement is grouped:

SELECT `clients`.* FROM `clients` WHERE (company_id = '1') AND ((client_email = '[e-mail]') OR (client_email_alt = '[e-mail]'))

回答1:

In order to achieve this, you have to construct the grouped clause within a single call to the where method.

If both values of conditions are the same, you can do this:

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

If there are multiple placeholders within the string, the DB adapter's quoteInto method will replace all placeholders with the provided value.

If you need to group an OR with different values for each field, you have to manually quote the values. It's a bit more complex:

$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 

回答2:

You can use getPart() to get WHERE statement and then connect sub-queries.

$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));

回答3:

For Zend Framework Version 2, things differ a bit:

See 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();

works fine and feels much cleaner than the ZF1 methods.

回答4:

In first you can generate subquery, then get "WHERE" part and insert into main query

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

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

回答5:

I needed to combine AND/OR statements but including OR statements conditionally, adding them only in some cases. This solution is an adaptation of what I did, based on small modifications of the accepted answer.

$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));