(AutoIt) DynamoDB - UpdateItem

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).

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

$oRest = ObjCreate("Chilkat.Rest")
Local $bSuccess

; 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

$oAuthAws = ObjCreate("Chilkat.AuthAws")
$oAuthAws.AccessKey = "AWS_ACCESS_KEY"
$oAuthAws.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.)
$oAuthAws.Region = "us-west-2"
$oAuthAws.ServiceName = "dynamodb"
; SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
$oRest.SetAuthAws($oAuthAws)

; URL: https://dynamodb.us-west-2.amazonaws.com/
Local $bTls = True
Local $iPort = 443
Local $bAutoReconnect = True
$bSuccess = $oRest.Connect("dynamodb.us-west-2.amazonaws.com",$iPort,$bTls,$bAutoReconnect)
If ($bSuccess <> True) Then
    ConsoleWrite("ConnectFailReason: " & $oRest.ConnectFailReason & @CRLF)
    ConsoleWrite($oRest.LastErrorText & @CRLF)
    Exit
EndIf

; 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"
; }

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

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

$oSbRequestBody = ObjCreate("Chilkat.StringBuilder")
$oJson.EmitSb($oSbRequestBody)
$oSbResponseBody = ObjCreate("Chilkat.StringBuilder")
$bSuccess = $oRest.FullRequestSb("POST","/",$oSbRequestBody,$oSbResponseBody)
If ($bSuccess <> True) Then
    ConsoleWrite($oRest.LastErrorText & @CRLF)
    Exit
EndIf

Local $iRespStatusCode = $oRest.ResponseStatusCode
ConsoleWrite("response status code = " & $iRespStatusCode & @CRLF)
If ($iRespStatusCode >= 400) Then
    ConsoleWrite("Response Status Code = " & $iRespStatusCode & @CRLF)
    ConsoleWrite("Response Header:" & @CRLF)
    ConsoleWrite($oRest.ResponseHeader & @CRLF)
    ConsoleWrite("Response Body:" & @CRLF)
    ConsoleWrite($oSbResponseBody.GetAsString() & @CRLF)
    Exit
EndIf

$oJsonResponse = ObjCreate("Chilkat.JsonObject")
$oJsonResponse.LoadSb($oSbResponseBody)

$oJsonResponse.EmitCompact = False
ConsoleWrite($oJsonResponse.Emit() & @CRLF)

; 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

Local $strVal

Local $sAttributesLastPostedByS = $oJsonResponse.StringOf("Attributes.LastPostedBy.S")
Local $sAttributesForumNameS = $oJsonResponse.StringOf("Attributes.ForumName.S")
Local $sAttributesLastPostDateTimeS = $oJsonResponse.StringOf("Attributes.LastPostDateTime.S")
Local $sAttributesSubjectS = $oJsonResponse.StringOf("Attributes.Subject.S")
Local $sAttributesViewsN = $oJsonResponse.StringOf("Attributes.Views.N")
Local $sAttributesMessageS = $oJsonResponse.StringOf("Attributes.Message.S")
Local $i = 0
Local $iCount_i = $oJsonResponse.SizeOfArray("Attributes.Tags.SS")
While $i < $iCount_i
    $oJsonResponse.I = $i
    $strVal = $oJsonResponse.StringOf("Attributes.Tags.SS[i]")
    $i = $i + 1
Wend