Kettle

Kettle is a lightweight object-dynamodb mapper for PHP. Kettle provides a simple interface to Amazon DynamoDB.

See Some Code

<?php
use Kettle\ORM;

$user = ORM::factory('User')->findOne(10);
$user->name = 'John';
$user->save();


$tweets = ORM::factory('Tweet')->where('user_id', 10)
                 ->findMany();

foreach ($tweets as $tweet) {
    echo $tweet->text . PHP_EOL;
}

1. Installation

---

Package is available on Packagist, you can install it using Composer.

$ cat <<EOF > composer.json
{
    "require": {
        "kettle/dynamodb-orm": "0.2.0"
    }
}
EOF

$ composer install

2. Configuration

---

<?php
use Kettle\ORM;

ORM::configure("key",    'AWS_KEY');
ORM::configure("secret", 'AWS_SECRET');
ORM::configure("region", 'AWS_REGION');

// In order to use DynamoDB Local, you need to set "base_url".
// ORM::configure("base_url", 'http://localhost:8000/');

If you are using multiple aws account, use as follows.

<?php
use Kettle\ORM;

ORM::configure("key",    'AWS_KEY',    'account-2');
ORM::configure("secret", 'AWS_SECRET', 'account-2');
ORM::configure("region", 'AWS_REGION', 'account-2');

$user = ORM::factory('User', 'account-2');

3. Create Model Class

---

<?php

class User extends ORM {
    protected $_table_name = 'user';
    protected $_hash_key   = 'user_id';
    protected $_schema = array(
      'user_id'    => 'N',  // user_id is number
      'name'       => 'S',  // name is string
      'age'        => 'N',
      'country'    => 'S',
     );
}

If you use a generator, you can also create an class as follows.

$ php bin/kettle-skeleton.php --table-name user --region ap-northeast-1 > User.php

Table must have been created in advance. Because this generator generates a class based on the information and data collected by the "describeTable" and "scan" operation.

4. Create

---

<?php

$user = ORM::factory('User')->create();
$user->user_id = 1;
$user->name    = 'John';
$user->age     = 20;
$user->save();

5. Retrieve

---

<?php

$user = ORM::factory('User')->findOne(1);
echo $user->name. PHP_EOL;

print_r($user->asArray());

6. Update

---

<?php

$user = ORM::factory('User')->findOne(1);
$user->age = 21;
$user->save();

7. Delete

---

<?php

$user = ORM::factory('User')->findOne(1);
$user->delete();

8. Find

---

<?php

$tweets = ORM::factory('Tweets')
        ->where('user_id', 1)
        ->where('timestamp', '>', 1397264554)
        ->findMany();

foreach ($tweets as $tweet) {
     echo $tweet->text . PHP_EOL;
}

9. Find first record

---

<?php

$tweet = ORM::factory('Tweets')
        ->where('user_id', 1)
        ->where('timestamp', '>', 1397264554)
        ->findFirst();

echo $tweet->text . PHP_EOL;

10. Find by Global Secondary Index

---

<?php

$users = ORM::factory('User')
        ->where('country', 'Japan')
        ->where('age', '>=', 20)
        ->index('country-age-index')  // specify index name
        ->findMany();

11. Query Filtering

---

<?php

$tweets = ORM::factory('Tweets')
          ->where('user_id', 1)
          ->filter('is_deleted', 0) // using filter
          ->findMany();