How to access Zend\db\Adapter inside Controller\Plugin\MyPlugins ZF2? - zend-framework2

Question

How am I able to access Zend\db\Adapter from within my controller plugin Controller\Plugin\MyPlugins?
I would like to execute
$this->getServiceLocator()
->getServiceLocator()
->get('Zend\Db\Adapter\Adapter')
->query("Select * from ABC ")

Answer 1

From within the plugin you can access the controller (providing it extends Zend\Mvc\Controller\Plugin\AbstractPlugin), and therefore the service manager, using:
$this->getController()->getServiceLocator();
However accessing the service manager to fetch the plugin dependency (the adapter) from within the plugin is very bad practice.
A much better solution would be to 'inject' the adapter using a service factory.
use MyModule\Mvc\Controller\Plugin\MyPlugin;
use Zend\ServiceManager\ServiceLocatorInterface;
use Zend\ServiceManager\FactoryInterface;
class MyPluginFactory implements FactoryInterface
{
public function createService(ServiceLocatorInterface $pluginManager)
{
$serviceManager = $pluginManager->getServiceLocator();
return new MyPlugin(
$serviceManager->get('My/Db/Adapter') // inject db adapter
);
}
}
Modify the plugin's __construct to allow the adapter in
class MyPlugin extends AbstractPlugin
{
protected $dbAdapter;
public function __construct(Adapter $dbAdapter)
{
$this->dbAdapter = $dbAdapter;
}
//...
}
Lastly register it as a controller plugin in Module.php (or in module.config.php)
// Module.php
public function getControllerPluginConfig()
{
return array(
'factories' => array(
'MyPlugin' => 'MyModule\Mvc\Controller\Plugin\MyPluginFactory'
),
);
}

Answer 2

Here is my code snippets
inside the controller path "modules/Admin/Controller/AreaController.php"
public function arealistAction() {
$Search = new Plugin\SearchBox(); //calling the searchbox class
$Search->setButtons('Operator', 'query', 'Select id,name as text from Operator where Status=1 ');
//passing parameter for searchbox
$box = $Search->renderSearchBox();
}
The below code for SearchBox at "modules/Admin/Controller/Plugin/SearchBox.php"
namespace Admin\Controller\Plugin;
class SearchBox extends \Zend\Mvc\Controller\Plugin\AbstractPlugin {
protected $RawSearch = array();
//Get the user data
public function setButtons($label, $opt, $dbcols, $values = "") {
$this->$RawSearch = array(
'label' => $label,
'opt' => $opt,
'values' => $values,
'dbcols' => $dbcols,
);
}
//Process the search value
public function ProcessSearchValue($val) {
switch ($val['opt']) {
case 'date':
case 'text':
$vHtml = '<input type="text" name="' . $val['dbcols'] . '" id="' . $val['dbcols'] . '">';
break;
case 'query':
$dbadpater = $this->getController()->getServiceLocator()->get('Zend\Db\Adapter\Adapter');
$Statement = $dbadpater->query($val['values']);
$results = $Statement->execute();
$vHtml = '<select name="' . $val['dbcols'] . '" id="' . $val['dbcols'] . '">';
if (!empty($results)) {
foreach ($results as $rkey => $rval) {
$vHtml .='<option value="' . $rval['id'] . '">' . $rval['text'] . '</option>';
}
}
$vHtml .='</select>';
break;
}
return $vHtml;
}
public function ProcessOptValue($val) {
$oHtml = '<select name="' . $val['dbcols'] . '" id="' . $val['dbcols'] . '">';
$oHtml .='<option value="eq">Equal</option>';
switch ($val['opt']) {
case 'date':
break;
case 'text':
$oHtml .='<option value="cnt">Contain</option>';
$oHtml .='<option value="ncnt">Not Contain</option>';
break;
case 'query':
$oHtml .='<option value="lth">Less Than</option>';
$oHtml .='<option value="gth">Greater Than</option>';
$oHtml .='<option value="leq">Less than Equal</option>';
$oHtml .='<option value="geq">Greater than Equal</option>';
break;
}
$oHtml .= '</select>';
return $oHtml;
}
public function renderSearchBox() {
if (!empty($this->RawSearch)) {
$Sbox = '<table cellspacing="0px" cellpadding="0px">';
foreach ($this->RawSearch as $key => $val) {
$Sbox.= '<tr>'
. '<td><label>'.$val['label'].'</label></td>'
. '<td>'.$this->ProcessOptValue($val).'</td>'
. '<td>'.$this->ProcessSearchValue($val).'</td>'
. '</tr>';
}
$Sbox.='</table>';
}
return $Sbox;
}
}
Now when i execute the statement "$box = $Search->renderSearchBox();" it give me the error.
I am not able to execute the query inside the plugins.