Need a complete example for DynamoDB with php

I want to write service in php where -

1) DynamoDB will have table t with two columns key and val

2) I will check if some key exists in table t or not.

3) If exist read data .. if don't exist insert new key-value in table t

I was checking some links http://docs.aws.amazon.com/AWSSDKforPHP/latest/index.html#m=AmazonDynamoDB/put_item http://docs.aws.amazon.com/aws-sdk-php/guide/latest/quick-start.html

Which one to follow ?

Also can someone give me quick example and exact syntax.

Thanks in advance.

回答1:

The full walkthrough is located HERE. It gives you a step by step outline of the setup process for credentials and comes with a easy to use add on to the PHP SDK for AWS

AWS Setup - AWS doesn't lay out the Credentials setup for you set by step, so I will.

1. Go to AWS and get your PUBLIC_KEY and PRIVATE_KEY
- AWS does have tutorials for this HERE and HERE
2. Open Terminal
3. If you haven't created your credentials yet, in Terminal's fresh page, type in:
```
nano ~/.aws/credentials
```
- The nano function page will open up. You will see GNU nano 2.0.6... at the top.

4. Inside the nano page, type in:

[default]
aws_access_key_id = public_key_ABCDEFGHIJKLMNOPQRSTUVWXYZ
aws_secret_access_key = private_key_s0m3_CR42Y_l3tt3rS_i5y0ur53cr3tK3y

5. Once you've typed it out, hit CONTROL + X (Yes...Control, not Command).
6. Hit Y then ENTER
7. Get the [AWS_SDK_PHP][4]
8. Go to Your Elastic Beanstalk
9. When you are done creating your app and you see the Overview screen with the green check. Look to the side and hit Configuration.
10. Under Software Configuration -> Document root: type in: /
11. Under Property Name -> AWS_ACCESS_KEY_ID type in: [your_access_key]
12. Under AWS_ACCESS_KEY_ID is the AWS_SECRET_KEY, type in: [your_secret_key]
13. When your PHP Project is ready. Put all your files into one folder. Name the folder [whatever], then compress the files inside [whatever]. Do not compress the whole folder. Only compress the files in the folder. If one of these files includes your index.php or index.html, your project will show up on EBS default URL.
14. Your project should be called Archive.zip (Mac). Go to EBS, upload the zip and there you go! All finished with AWS Setup!

AWS Setup

1. Put the AWS_SDK_PHP in an empty folder

2. At the top of the file using the SDK (index.php or whatever), put in:

require 'aws/aws-autoloader.php';
date_default_timezone_set('America/New_York');

use Aws\DynamoDb\DynamoDbClient;

$client = new DynamoDbClient([
    'profile' => 'default',
    'region'  => 'us-east-1',
    'version' => 'latest'
]);

Data Types
- S = String
- N = Number
- B = Binary

The Basic Methods

Describe Table

$result = $client->describeTable(array(
    'TableName' => '[Table_Name]'
));

echo $result;

Put Item

$response = $client->putItem(array(
    'TableName' => '[Table_Name]', 
    'Item' => array(
        '[Hash_Name]'   => array('S' => '[Hash_Value]'),
        '[Range_Name]'  => array('S' => '[Range_Value]')
    )
));

//Echoing the response is only good to check if it was successful. Status: 200 = Success
echo $response;

Get Item

$response = $client->getItem(array(
    'TableName' => '[Table_Name]',
    'Key' => array(
        '[Hash_Name]'  => array('S' => '[Hash_Value]'),
        '[Range_Name]' => array('S' => '[Range_Value]')
    )
));

echo $response;

Delete Item

$response = $client->deleteItem(array(
    'TableName' => '[Table_Name]',
    'Key' => array(
        '[Hash_Name]'  => array('S' => '[Hash_Value]'),
        '[Range_Name]' => array('S' => '[Range_Value]')
    )
));
//Echoing the response is only good to check if it was successful. Status: 200 = Success
echo $response;

Query Item

$response = $client->query(array(
    'TableName' => '[Table_Name]',
    'KeyConditionExpression' => '[Hash_Name] = :v_hash and [Range_Name] = :v_range',
    'ExpressionAttributeValues' =>  array (
        ':v_hash'  => array('S' => '[Hash_Value]'),
        ':v_range' => array('S' => '[Range_Value]')
    )
));

echo $response;

Hope this helps.

回答2:

You can Follow Example : http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/GSILowLevelPHP.Example.html

or you can also follow the guidelines :

http://docs.aws.amazon.com/aws-sdk-php/latest/class-Aws.DynamoDb.DynamoDbClient.html

It hepled me alot

回答3:

I found this basic walkthrough quite useful:

http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/SampleData.html