C++

DynamoDB - PutItem

See more Amazon DynamoDB Examples

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. C++

#include <CkRest.h>
#include <CkAuthAws.h>
#include <CkJsonObject.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    bool success = false;

    CkRest 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

    CkAuthAws authAws;
    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/
    bool bTls = true;
    int port = 443;
    bool bAutoReconnect = true;
    success = rest.Connect("dynamodb.us-west-2.amazonaws.com",port,bTls,bAutoReconnect);
    if (success != true) {
        std::cout << "ConnectFailReason: " << rest.get_ConnectFailReason() << "\r\n";
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    // 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?"
    //     }
    //   }
    // }

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

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

    CkStringBuilder sbRequestBody;
    json.EmitSb(sbRequestBody);
    CkStringBuilder sbResponseBody;
    success = rest.FullRequestSb("POST","/",sbRequestBody,sbResponseBody);
    if (success != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    int respStatusCode = rest.get_ResponseStatusCode();
    std::cout << "response status code = " << respStatusCode << "\r\n";
    if (respStatusCode >= 400) {
        std::cout << "Response Status Code = " << respStatusCode << "\r\n";
        std::cout << "Response Header:" << "\r\n";
        std::cout << rest.responseHeader() << "\r\n";
        std::cout << "Response Body:" << "\r\n";
        std::cout << sbResponseBody.getAsString() << "\r\n";
        return;
    }

    CkJsonObject jsonResponse;
    jsonResponse.LoadSb(sbResponseBody);

    jsonResponse.put_EmitCompact(false);
    std::cout << jsonResponse.emit() << "\r\n";
    }