PHP ActiveX

DynamoDB - UpdateItem

See more Amazon DynamoDB Examples

Edits an existing item's attributes, or adds a new item to the table if it does not already exist. You can put, delete, or add attribute values. You can also perform a conditional update on an existing item (insert a new attribute name-value pair if it doesn't exist, or replace an existing name-value pair if it has certain expected attribute values). PHP ActiveX

<?php

$success = 0;

$rest = new COM("Chilkat.Rest");

// Implements the following CURL command:

// curl -X POST https://dynamodb.us-west-2.amazonaws.com/ \
//   -H "Accept-Encoding: identity" \
//   -H "Content-Type: application/x-amz-json-1.0" \
//   -H "Authorization: AWS4-HMAC-SHA256 Credential=<Credential>, SignedHeaders=<Headers>, Signature=<Signature>" \
//   -H "X-Amz-Date: <Date>" \
//   -H "X-Amz-Target: DynamoDB_20120810.UpdateItem" \
//   -d '{
//     "TableName": "Thread",
//     "Key": {
//         "ForumName": {
//             "S": "Amazon DynamoDB"
//         },
//         "Subject": {
//             "S": "Maximum number of items?"
//         }
//     },
//     "UpdateExpression": "set LastPostedBy = :val1",
//     "ConditionExpression": "LastPostedBy = :val2",
//     "ExpressionAttributeValues": {
//         ":val1": {"S": "alice@example.com"},
//         ":val2": {"S": "fred@example.com"}
//     },
//     "ReturnValues": "ALL_NEW"
// }'

// Use the following online tool to generate REST code from a CURL command
// Convert a cURL Command to REST Source Code

$authAws = new COM("Chilkat.AuthAws");
$authAws->AccessKey = 'AWS_ACCESS_KEY';
$authAws->SecretKey = 'AWS_SECRET_KEY';
// Don't forget to change the region to your particular region. (Also make the same change in the call to Connect below.)
$authAws->Region = 'us-west-2';
$authAws->ServiceName = 'dynamodb';
// SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
$rest->SetAuthAws($authAws);

// URL: https://dynamodb.us-west-2.amazonaws.com/
$bTls = 1;
$port = 443;
$bAutoReconnect = 1;
$success = $rest->Connect('dynamodb.us-west-2.amazonaws.com',$port,$bTls,$bAutoReconnect);
if ($success != 1) {
    print 'ConnectFailReason: ' . $rest->ConnectFailReason . "\n";
    print $rest->LastErrorText . "\n";
    exit;
}

// Note: The above code does not need to be repeatedly called for each REST request.
// The rest object can be setup once, and then many requests can be sent.  Chilkat will automatically
// reconnect within a FullRequest* method as needed.  It is only the very first connection that is explicitly
// made via the Connect method.

// Use this online tool to generate code from sample JSON:
// Generate Code to Create JSON

// The following JSON is sent in the request body.

// {
//   "TableName": "Thread",
//   "Key": {
//     "ForumName": {
//       "S": "Amazon DynamoDB"
//     },
//     "Subject": {
//       "S": "Maximum number of items?"
//     }
//   },
//   "UpdateExpression": "set LastPostedBy = :val1",
//   "ConditionExpression": "LastPostedBy = :val2",
//   "ExpressionAttributeValues": {
//     ":val1": {
//       "S": "alice@example.com"
//     },
//     ":val2": {
//       "S": "fred@example.com"
//     }
//   },
//   "ReturnValues": "ALL_NEW"
// }

$json = new COM("Chilkat.JsonObject");
$json->UpdateString('TableName','Thread');
$json->UpdateString('Key.ForumName.S','Amazon DynamoDB');
$json->UpdateString('Key.Subject.S','Maximum number of items?');
$json->UpdateString('UpdateExpression','set LastPostedBy = :val1');
$json->UpdateString('ConditionExpression','LastPostedBy = :val2');
$json->UpdateString('ExpressionAttributeValues.:val1.S','alice@example.com');
$json->UpdateString('ExpressionAttributeValues.:val2.S','fred@example.com');
$json->UpdateString('ReturnValues','ALL_NEW');

$rest->AddHeader('Content-Type','application/x-amz-json-1.0');
$rest->AddHeader('X-Amz-Target','DynamoDB_20120810.UpdateItem');
$rest->AddHeader('Accept-Encoding','identity');

$sbRequestBody = new COM("Chilkat.StringBuilder");
$json->EmitSb($sbRequestBody);
$sbResponseBody = new COM("Chilkat.StringBuilder");
$success = $rest->FullRequestSb('POST','/',$sbRequestBody,$sbResponseBody);
if ($success != 1) {
    print $rest->LastErrorText . "\n";
    exit;
}

$respStatusCode = $rest->ResponseStatusCode;
print 'response status code = ' . $respStatusCode . "\n";
if ($respStatusCode >= 400) {
    print 'Response Status Code = ' . $respStatusCode . "\n";
    print 'Response Header:' . "\n";
    print $rest->ResponseHeader . "\n";
    print 'Response Body:' . "\n";
    print $sbResponseBody->getAsString() . "\n";
    exit;
}

$jsonResponse = new COM("Chilkat.JsonObject");
$jsonResponse->LoadSb($sbResponseBody);

$jsonResponse->EmitCompact = 0;
print $jsonResponse->emit() . "\n";

// Sample JSON response:
// (Sample code for parsing the JSON response is shown below)

// {
//   "Attributes": {
//     "LastPostedBy": {
//       "S": "alice@example.com"
//     },
//     "ForumName": {
//       "S": "Amazon DynamoDB"
//     },
//     "LastPostDateTime": {
//       "S": "20130320010350"
//     },
//     "Tags": {
//       "SS": [
//         "Update",
//         "Multiple Items",
//         "HelpMe"
//       ]
//     },
//     "Subject": {
//       "S": "Maximum number of items?"
//     },
//     "Views": {
//       "N": "5"
//     },
//     "Message": {
//       "S": "I want to put 10 million data items to an Amazon DynamoDB table.  Is there an upper limit?"
//     }
//   }
// }

// Sample code for parsing the JSON response...
// Use the following online tool to generate parsing code from sample JSON:
// Generate Parsing Code from JSON

$AttributesLastPostedByS = $jsonResponse->stringOf('Attributes.LastPostedBy.S');
$AttributesForumNameS = $jsonResponse->stringOf('Attributes.ForumName.S');
$AttributesLastPostDateTimeS = $jsonResponse->stringOf('Attributes.LastPostDateTime.S');
$AttributesSubjectS = $jsonResponse->stringOf('Attributes.Subject.S');
$AttributesViewsN = $jsonResponse->stringOf('Attributes.Views.N');
$AttributesMessageS = $jsonResponse->stringOf('Attributes.Message.S');
$i = 0;
$count_i = $jsonResponse->SizeOfArray('Attributes.Tags.SS');
while ($i < $count_i) {
    $jsonResponse->I = $i;
    $strVal = $jsonResponse->stringOf('Attributes.Tags.SS[i]');
    $i = $i + 1;
}


?>