Visual FoxPro
DynamoDB - PutItem

Creates a new item, or replaces an old item with a new item. If an item that has the same primary key as the new item already exists in the specified table, the new item completely replaces the existing item.
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LOCAL lnSuccess
LOCAL loRest
LOCAL loAuthAws
LOCAL lnBTls
LOCAL lnPort
LOCAL lnBAutoReconnect
LOCAL loJson
LOCAL loSbRequestBody
LOCAL loSbResponseBody
LOCAL lnRespStatusCode
LOCAL loJsonResponse

lnSuccess = 0

loRest = CreateObject('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.PutItem" \
*   -d '{
*     "TableName": "Thread",
*     "Item": {
*         "LastPostDateTime": {
*             "S": "201303190422"
*         },
*         "Tags": {
*             "SS": ["Update","Multiple Items","HelpMe"]
*         },
*         "ForumName": {
*             "S": "Amazon DynamoDB"
*         },
*         "Message": {
*             "S": "I want to update multiple items in a single call. What is the best way to do that?"
*         },
*         "Subject": {
*             "S": "How do I update multiple items?"
*         },
*         "LastPostedBy": {
*             "S": "fred@example.com"
*         }
*     },
*     "ConditionExpression": "ForumName <> :f and Subject <> :s",
*     "ExpressionAttributeValues": {
*         ":f": {"S": "Amazon DynamoDB"},
*         ":s": {"S": "How do I update multiple items?"}
*     }
* }'

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

loAuthAws = CreateObject('Chilkat.AuthAws')
loAuthAws.AccessKey = "AWS_ACCESS_KEY"
loAuthAws.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.)
loAuthAws.Region = "us-west-2"
loAuthAws.ServiceName = "dynamodb"
* SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
loRest.SetAuthAws(loAuthAws)

* URL: https://dynamodb.us-west-2.amazonaws.com/
lnBTls = 1
lnPort = 443
lnBAutoReconnect = 1
lnSuccess = loRest.Connect("dynamodb.us-west-2.amazonaws.com",lnPort,lnBTls,lnBAutoReconnect)
IF (lnSuccess <> 1) THEN
    ? "ConnectFailReason: " + STR(loRest.ConnectFailReason)
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loAuthAws
    CANCEL
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",
*   "Item": {
*     "LastPostDateTime": {
*       "S": "201303190422"
*     },
*     "Tags": {
*       "SS": [
*         "Update",
*         "Multiple Items",
*         "HelpMe"
*       ]
*     },
*     "ForumName": {
*       "S": "Amazon DynamoDB"
*     },
*     "Message": {
*       "S": "I want to update multiple items in a single call. What is the best way to do that?"
*     },
*     "Subject": {
*       "S": "How do I update multiple items?"
*     },
*     "LastPostedBy": {
*       "S": "fred@example.com"
*     }
*   },
*   "ConditionExpression": "ForumName <> :f and Subject <> :s",
*   "ExpressionAttributeValues": {
*     ":f": {
*       "S": "Amazon DynamoDB"
*     },
*     ":s": {
*       "S": "How do I update multiple items?"
*     }
*   }
* }

loJson = CreateObject('Chilkat.JsonObject')
loJson.UpdateString("TableName","Thread")
loJson.UpdateString("Item.LastPostDateTime.S","201303190422")
loJson.UpdateString("Item.Tags.SS[0]","Update")
loJson.UpdateString("Item.Tags.SS[1]","Multiple Items")
loJson.UpdateString("Item.Tags.SS[2]","HelpMe")
loJson.UpdateString("Item.ForumName.S","Amazon DynamoDB")
loJson.UpdateString("Item.Message.S","I want to update multiple items in a single call. What is the best way to do that?")
loJson.UpdateString("Item.Subject.S","How do I update multiple items?")
loJson.UpdateString("Item.LastPostedBy.S","fred@example.com")
loJson.UpdateString("ConditionExpression","ForumName <> :f and Subject <> :s")
loJson.UpdateString("ExpressionAttributeValues.:f.S","Amazon DynamoDB")
loJson.UpdateString("ExpressionAttributeValues.:s.S","How do I update multiple items?")

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

loSbRequestBody = CreateObject('Chilkat.StringBuilder')
loJson.EmitSb(loSbRequestBody)
loSbResponseBody = CreateObject('Chilkat.StringBuilder')
lnSuccess = loRest.FullRequestSb("POST","/",loSbRequestBody,loSbResponseBody)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loAuthAws
    RELEASE loJson
    RELEASE loSbRequestBody
    RELEASE loSbResponseBody
    CANCEL
ENDIF

lnRespStatusCode = loRest.ResponseStatusCode
? "response status code = " + STR(lnRespStatusCode)
IF (lnRespStatusCode >= 400) THEN
    ? "Response Status Code = " + STR(lnRespStatusCode)
    ? "Response Header:"
    ? loRest.ResponseHeader
    ? "Response Body:"
    ? loSbResponseBody.GetAsString()
    RELEASE loRest
    RELEASE loAuthAws
    RELEASE loJson
    RELEASE loSbRequestBody
    RELEASE loSbResponseBody
    CANCEL
ENDIF

loJsonResponse = CreateObject('Chilkat.JsonObject')
loJsonResponse.LoadSb(loSbResponseBody)

loJsonResponse.EmitCompact = 0
? loJsonResponse.Emit()

RELEASE loRest
RELEASE loAuthAws
RELEASE loJson
RELEASE loSbRequestBody
RELEASE loSbResponseBody
RELEASE loJsonResponse