Perl

DynamoDB - DeleteItem

See more Amazon DynamoDB Examples

Deletes a single item in a table by primary key. You can perform a conditional delete operation that deletes the item if it exists, or if it has an expected attribute value. Perl

use chilkat();

$success = 0;

$rest = chilkat::CkRest->new();

# 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.DeleteItem" \
#   -d '{
#     "TableName": "Thread",
#     "Key": {
#         "ForumName": {
#             "S": "Amazon DynamoDB"
#         },
#         "Subject": {
#             "S": "How do I update multiple items?"
#         }
#     },
#     "ConditionExpression": "attribute_not_exists(Replies)",
#     "ReturnValues": "ALL_OLD"
# }'

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

$authAws = chilkat::CkAuthAws->new();
$authAws->put_AccessKey("AWS_ACCESS_KEY");
$authAws->put_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->put_Region("us-west-2");
$authAws->put_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->get_ConnectFailReason() . "\r\n";
    print $rest->lastErrorText() . "\r\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": "How do I update multiple items?"
#     }
#   },
#   "ConditionExpression": "attribute_not_exists(Replies)",
#   "ReturnValues": "ALL_OLD"
# }

$json = chilkat::CkJsonObject->new();
$json->UpdateString("TableName","Thread");
$json->UpdateString("Key.ForumName.S","Amazon DynamoDB");
$json->UpdateString("Key.Subject.S","How do I update multiple items?");
$json->UpdateString("ConditionExpression","attribute_not_exists(Replies)");
$json->UpdateString("ReturnValues","ALL_OLD");

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

$sbRequestBody = chilkat::CkStringBuilder->new();
$json->EmitSb($sbRequestBody);
$sbResponseBody = chilkat::CkStringBuilder->new();
$success = $rest->FullRequestSb("POST","/",$sbRequestBody,$sbResponseBody);
if ($success != 1) {
    print $rest->lastErrorText() . "\r\n";
    exit;
}

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

$jsonResponse = chilkat::CkJsonObject->new();
$jsonResponse->LoadSb($sbResponseBody);

$jsonResponse->put_EmitCompact(0);
print $jsonResponse->emit() . "\r\n";

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

# {
#   "Attributes": {
#     "LastPostedBy": {
#       "S": "fred@example.com"
#     },
#     "ForumName": {
#       "S": "Amazon DynamoDB"
#     },
#     "LastPostDateTime": {
#       "S": "201303201023"
#     },
#     "Tags": {
#       "SS": [
#         "Update",
#         "Multiple Items",
#         "HelpMe"
#       ]
#     },
#     "Subject": {
#       "S": "How do I update multiple items?"
#     },
#     "Message": {
#       "S": "I want to update multiple items in a single call. What's the best way to do that?"
#     }
#   }
# }

# 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");
$AttributesMessageS = $jsonResponse->stringOf("Attributes.Message.S");
$i = 0;
$count_i = $jsonResponse->SizeOfArray("Attributes.Tags.SS");
while ($i < $count_i) {
    $jsonResponse->put_I($i);
    $strVal = $jsonResponse->stringOf("Attributes.Tags.SS[i]");
    $i = $i + 1;
}