(Ruby) DynamoDB - GetItem

The GetItem operation returns a set of attributes for the item with the given primary key. If there is no matching item, GetItem does not return any data and there will be no Item element in the response.

For more information, see https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_GetItem.html

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

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.GetItem" \
#   -d '{
#     "TableName": "Thread",
#     "Key": {
#         "ForumName": {
#             "S": "Amazon DynamoDB"
#         },
#         "Subject": {
#             "S": "How do I update multiple items?"
#         }
#     },
#     "ProjectionExpression":"LastPostDateTime, Message, Tags",
#     "ConsistentRead": true,
#     "ReturnConsumedCapacity": "TOTAL"
# }'

# 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 = true
port = 443
bAutoReconnect = true
success = rest.Connect("dynamodb.us-west-2.amazonaws.com",port,bTls,bAutoReconnect)
if (success != true)
    print "ConnectFailReason: " + rest.get_ConnectFailReason().to_s() + "\n";
    print rest.lastErrorText() + "\n";
    exit
end

# 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?"
#     }
#   },
#   "ProjectionExpression": "LastPostDateTime, Message, Tags",
#   "ConsistentRead": true,
#   "ReturnConsumedCapacity": "TOTAL"
# }

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("ProjectionExpression","LastPostDateTime, Message, Tags")
json.UpdateBool("ConsistentRead",true)
json.UpdateString("ReturnConsumedCapacity","TOTAL")

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

sbRequestBody = Chilkat::CkStringBuilder.new()
json.EmitSb(sbRequestBody)
sbResponseBody = Chilkat::CkStringBuilder.new()
success = rest.FullRequestSb("POST","/",sbRequestBody,sbResponseBody)
if (success != true)
    print rest.lastErrorText() + "\n";
    exit
end

respStatusCode = rest.get_ResponseStatusCode()
print "response status code = " + respStatusCode.to_s() + "\n";
if (respStatusCode >= 400)
    print "Response Status Code = " + respStatusCode.to_s() + "\n";
    print "Response Header:" + "\n";
    print rest.responseHeader() + "\n";
    print "Response Body:" + "\n";
    print sbResponseBody.getAsString() + "\n";
    exit
end

jsonResponse = Chilkat::CkJsonObject.new()
jsonResponse.LoadSb(sbResponseBody)

jsonResponse.put_EmitCompact(false)
print jsonResponse.emit() + "\n";

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

# {
#   "ConsumedCapacity": {
#     "CapacityUnits": 1,
#     "TableName": "Thread"
#   },
#   "Item": {
#     "Tags": {
#       "SS": [
#         "Update",
#         "Multiple Items",
#         "HelpMe"
#       ]
#     },
#     "LastPostDateTime": {
#       "S": "201303190436"
#     },
#     "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

ConsumedCapacityCapacityUnits = jsonResponse.IntOf("ConsumedCapacity.CapacityUnits")
ConsumedCapacityTableName = jsonResponse.stringOf("ConsumedCapacity.TableName")
ItemLastPostDateTimeS = jsonResponse.stringOf("Item.LastPostDateTime.S")
ItemMessageS = jsonResponse.stringOf("Item.Message.S")
i = 0
count_i = jsonResponse.SizeOfArray("Item.Tags.SS")
while i < count_i
    jsonResponse.put_I(i)
    strVal = jsonResponse.stringOf("Item.Tags.SS[i]")
    i = i + 1
end