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POData Mapper Pattern: Complexe query from Service Layer
 

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  1. POData Mapper Pattern: Complexe query from Service Layer
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    <p>I'm sing the Data Mapper Pattern in Zend Framework. This works well so far, but now I got to a point where I need your help/opinion. So let's start with the Code:</p> <p>We got a table with several Persons:</p> <pre><code>CREATE TABLE `persons` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(50) NOT NULL, `age` int(3) NOT NULL, `haircolor` varchar(20) DEFAULT NULL, PRIMARY KEY (`id``), ); </code></pre> <p>Now I try to select all people, that have brown hair. I use the following method in the ServiceLayer</p> <pre><code>public function getPeopleByHaircolor($hair) { return $this-&gt;getMapper()-&gt;fetch('haircolor = ?', $hair); } </code></pre> <p>The method in the Mapper looks like this:</p> <pre><code>public function fetch($condition, $value) { $resultSet = $this-&gt;getTable()-&gt;fetchAll($this-&gt;getTable()-&gt;select()-&gt;where($cond, $value)); $entries = array(); foreach($resultSet as $row) { $entry = new Default_Model_Person(); $entry-&gt;id = $row-&gt;id; $entry-&gt;name = $row-&gt;name; [...] } return $entries; } </code></pre> <p>I think I follow the Data Mapper Pattern with this methods... </p> <hr> <p><strong>Now the Problem:</strong></p> <p>I want to select Persons, that have brown hair AND that are younger than 20 yrs. So how can I do that? My try:</p> <pre><code>public function getTeens($hair) { $rows = $this-&gt;getMapper()-&gt;fetch('haircolor = ?', $hair); $return = array(); foreach($rows as $row) { if((int)$row-&gt;age &lt; 20) $return[] = $row; } return $return; } </code></pre> <p>But if you get more variables, like "people with brown hair, younger than 20yrs and with the name 'Foo Bar'", I need more and more methods and/or foreach loops.</p> <hr> <p><strong>My Question:</strong></p> <p>How would you do this in the Data Mapper Pattern? If I do a native SQL query like $serviceLayer->mapper->table->qry('SELECT ...'), is this breaking the Data Mapper Pattern? I don't like those additional foreach loops and it feels like I'm doing something wrong, so I wrote this question. </p>
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