vendor/davedevelopment/phpmig/src/Phpmig/Adapter/Zend/DbAdapter.php

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<?php
/**
 * @package    Phpmig
 * @subpackage Phpmig\Adapter
 */
namespace Phpmig\Adapter\Zend;

use Phpmig\Adapter\AdapterInterface;
use Phpmig\Migration\Migration;
use Zend\Db\Adapter\Adapter;
use Zend\Db\Metadata\Metadata;
use Zend\Db\Sql\Ddl\Column\Varchar;
use Zend\Db\Sql\Ddl\CreateTable;
use Zend\Db\Sql\Select;
use Zend\Db\Sql\Sql;
use Zend\Db\TableGateway\TableGateway;

/**
 * Phpmig adapter for zendframework/zend-db
 *
 * @package Phpmig\Adapter\Zend
 */
class DbAdapter implements AdapterInterface
{
    /**
     * @var TableGateway
     */
    private $tableGateway;

    /**
     * @var string
     */
    private $tableName;

    /**
     * @var Adapter
     */
    private $adapter;

    /**
     * @param Adapter $adapter
     * @param string $tableName
     */
    public function __construct(Adapter $adapter, $tableName)
    {
        $this->adapter   = $adapter;
        $this->tableName = $tableName;
    }

    /**
     * @return TableGateway
     */
    private function tableGateway()
    {
        if (!$this->tableGateway) {
            $this->tableGateway = new TableGateway($this->tableName, $this->adapter);
        }

        return $this->tableGateway;
    }