使用Zend Db Sql进行分页

Question

I'm following this tutorial on zend documentation to create the blog module from the beginning, finished and everything is working properly. On the previous tutorial that was to create an album module they used TableGateway and also showed how to create the pagination with it, but in this blog module they didn't and they are using Zend\\Db\\Sql .

I tried to find something on the internet about that and nothing...

public function findAllPosts()
{
    $sql       = new Sql($this->db);
    $select    = $sql->select('posts');
    $statement = $sql->prepareStatementForSqlObject($select);
    $result    = $statement->execute();

    if (! $result instanceof ResultInterface || ! $result->isQueryResult()) {
        return [];
    }

    $resultSet = new HydratingResultSet($this->hydrator, $this->postPrototype);
    $resultSet->initialize($result);
    return $resultSet;
}

On the previous tutorial we created two methods, one called fetchAll($paginated = false) and another one called fetchPaginatedResults , if $paginated was true it called the method fetchPaginatedResults , for example:

public function fetchAll($paginated = false)
{
    if ($paginated) {
        return $this->fetchPaginatedResults();
    }

    return $this->tableGateway->select();
}

private function fetchPaginatedResults()
{
    // Create a new Select object for the table:
    $select = new Select($this->tableGateway->getTable());

    // Create a new result set based on the Album entity:
    $resultSetPrototype = new ResultSet();
    $resultSetPrototype->setArrayObjectPrototype(new Album());

    // Create a new pagination adapter object:
    $paginatorAdapter = new DbSelect(
        // our configured select object:
        $select,
        // the adapter to run it against:
        $this->tableGateway->getAdapter(),
        // the result set to hydrate:
        $resultSetPrototype
    );

    $paginator = new Paginator($paginatorAdapter);
    return $paginator;
}

I was wondering, how to do the same using Zend\\Db\\Sql and HydratingResultSet ?

Answer 1

You must pick $db_adapter and you will get the paginator by :

use Zend\Paginator\Paginator;
use Zend\Paginator\Adapter\DbSelect;

$sql = new Sql($this->db);
$select = $sql->select('posts');
new Paginator(new DbSelect($select, $db_adpter));

Answer 2

you can set HydratingResultSet in Paginator.

Example:

    $sql = new Sql ( $this->db );
    $select = $sql->select ( $this->table );

    //$statement = $sql->prepareStatementForSqlObject ( $select );
    //$result = $statement->execute ();     
    //if (! $result instanceof ResultInterface || ! $result->isQueryResult ()) {return [ ];}

    $resultSet = new HydratingResultSet ( $this->hydrator, $this->Prototype );
    //$resultSet->initialize ( $result );
    // return $resultSet;

    // Executando
    $adapter = new \Zend\Paginator\Adapter\DbSelect ( $select, $this->db, $resultSet );
    $paginator = new \Zend\Paginator\Paginator ( $adapter );
    $paginator->setItemCountPerPage ( $count );
    $paginator->setCurrentPageNumber ( $offset );

    return $paginator;

but if you will use Paginator, I'm not sure if the Hydrator is the best option.

Remember , you need to install the package (if it is zf3)

$ composer require zendframework/zend-paginator
Using version ^2.7 for zendframework/zend-paginator
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
  - Installing zendframework/zend-paginator (2.7.0)
    Loading from cache


  Please select which config file you wish to inject 'Zend\Paginator' into:
  [0] Do not inject
  [1] config/modules.config.php
  [2] config/development.config.php.dist
  Make your selection (default is 0):1

  Remember this option for other packages of the same type? (y/N)
Installing Zend\Paginator from package zendframework/zend-paginator
zendframework/zend-paginator suggests installing zendframework/zend-cache (Zend\Cache component to support cache features)
Writing lock file
Generating autoload files