AutoIt

DynamoDB - Query

See more Amazon DynamoDB Examples

The Query operation finds items based on primary key values. You can query any table or secondary index that has a composite primary key (a partition key and a sort key). AutoIt

Local $bSuccess = False

$oRest = ObjCreate("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.Query" \
;   -d '{
;     "TableName": "Reply",
;     "IndexName": "PostedBy-Index",
;     "Limit": 3,
;     "ConsistentRead": true,
;     "ProjectionExpression": "Id, PostedBy, ReplyDateTime",
;     "KeyConditionExpression": "Id = :v1 AND PostedBy BETWEEN :v2a AND :v2b",
;     "ExpressionAttributeValues": {
;         ":v1": {"S": "Amazon DynamoDB#DynamoDB Thread 1"},
;         ":v2a": {"S": "User A"},
;         ":v2b": {"S": "User C"}
;     },
;     "ReturnConsumedCapacity": "TOTAL"
; }'

; 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": "Reply",
;   "IndexName": "PostedBy-Index",
;   "Limit": 3,
;   "ConsistentRead": true,
;   "ProjectionExpression": "Id, PostedBy, ReplyDateTime",
;   "KeyConditionExpression": "Id = :v1 AND PostedBy BETWEEN :v2a AND :v2b",
;   "ExpressionAttributeValues": {
;     ":v1": {
;       "S": "Amazon DynamoDB#DynamoDB Thread 1"
;     },
;     ":v2a": {
;       "S": "User A"
;     },
;     ":v2b": {
;       "S": "User C"
;     }
;   },
;   "ReturnConsumedCapacity": "TOTAL"
; }

$oJson = ObjCreate("Chilkat.JsonObject")
$oJson.UpdateString("TableName","Reply")
$oJson.UpdateString("IndexName","PostedBy-Index")
$oJson.UpdateInt("Limit",3)
$oJson.UpdateBool("ConsistentRead",True)
$oJson.UpdateString("ProjectionExpression","Id, PostedBy, ReplyDateTime")
$oJson.UpdateString("KeyConditionExpression","Id = :v1 AND PostedBy BETWEEN :v2a AND :v2b")
$oJson.UpdateString("ExpressionAttributeValues.:v1.S","Amazon DynamoDB#DynamoDB Thread 1")
$oJson.UpdateString("ExpressionAttributeValues.:v2a.S","User A")
$oJson.UpdateString("ExpressionAttributeValues.:v2b.S","User C")
$oJson.UpdateString("ReturnConsumedCapacity","TOTAL")

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

; {
;   "ConsumedCapacity": {
;     "CapacityUnits": 1,
;     "TableName": "Reply"
;   },
;   "Count": 2,
;   "Items": [
;     {
;       "ReplyDateTime": {
;         "S": "2015-02-18T20:27:36.165Z"
;       },
;       "PostedBy": {
;         "S": "User A"
;       },
;       "Id": {
;         "S": "Amazon DynamoDB#DynamoDB Thread 1"
;       }
;     },
;     {
;       "ReplyDateTime": {
;         "S": "2015-02-25T20:27:36.165Z"
;       },
;       "PostedBy": {
;         "S": "User B"
;       },
;       "Id": {
;         "S": "Amazon DynamoDB#DynamoDB Thread 1"
;       }
;     }
;   ],
;   "ScannedCount": 2
; }

; 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 $sReplyDateTimeS
Local $sPostedByS
Local $sIdS

Local $iConsumedCapacityCapacityUnits = $oJsonResponse.IntOf("ConsumedCapacity.CapacityUnits")
Local $sConsumedCapacityTableName = $oJsonResponse.StringOf("ConsumedCapacity.TableName")
Local $iCount = $oJsonResponse.IntOf("Count")
Local $iScannedCount = $oJsonResponse.IntOf("ScannedCount")
Local $i = 0
Local $iCount_i = $oJsonResponse.SizeOfArray("Items")
While $i < $iCount_i
    $oJsonResponse.I = $i
    $sReplyDateTimeS = $oJsonResponse.StringOf("Items[i].ReplyDateTime.S")
    $sPostedByS = $oJsonResponse.StringOf("Items[i].PostedBy.S")
    $sIdS = $oJsonResponse.StringOf("Items[i].Id.S")
    $i = $i + 1
Wend