Node.js

DynamoDB - DeleteItem

See more Amazon DynamoDB Examples

Deletes a single item in a table by primary key. You can perform a conditional delete operation that deletes the item if it exists, or if it has an expected attribute value. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    var rest = new 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.DeleteItem" \
    //   -d '{
    //     "TableName": "Thread",
    //     "Key": {
    //         "ForumName": {
    //             "S": "Amazon DynamoDB"
    //         },
    //         "Subject": {
    //             "S": "How do I update multiple items?"
    //         }
    //     },
    //     "ConditionExpression": "attribute_not_exists(Replies)",
    //     "ReturnValues": "ALL_OLD"
    // }'

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

    var authAws = new chilkat.AuthAws();
    authAws.AccessKey = "AWS_ACCESS_KEY";
    authAws.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.Region = "us-west-2";
    authAws.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/
    var bTls = true;
    var port = 443;
    var bAutoReconnect = true;
    success = rest.Connect("dynamodb.us-west-2.amazonaws.com",port,bTls,bAutoReconnect);
    if (success !== true) {
        console.log("ConnectFailReason: " + rest.ConnectFailReason);
        console.log(rest.LastErrorText);
        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",
    //   "Key": {
    //     "ForumName": {
    //       "S": "Amazon DynamoDB"
    //     },
    //     "Subject": {
    //       "S": "How do I update multiple items?"
    //     }
    //   },
    //   "ConditionExpression": "attribute_not_exists(Replies)",
    //   "ReturnValues": "ALL_OLD"
    // }

    var json = new chilkat.JsonObject();
    json.UpdateString("TableName","Thread");
    json.UpdateString("Key.ForumName.S","Amazon DynamoDB");
    json.UpdateString("Key.Subject.S","How do I update multiple items?");
    json.UpdateString("ConditionExpression","attribute_not_exists(Replies)");
    json.UpdateString("ReturnValues","ALL_OLD");

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

    var sbRequestBody = new chilkat.StringBuilder();
    json.EmitSb(sbRequestBody);
    var sbResponseBody = new chilkat.StringBuilder();
    success = rest.FullRequestSb("POST","/",sbRequestBody,sbResponseBody);
    if (success !== true) {
        console.log(rest.LastErrorText);
        return;
    }

    var respStatusCode = rest.ResponseStatusCode;
    console.log("response status code = " + respStatusCode);
    if (respStatusCode >= 400) {
        console.log("Response Status Code = " + respStatusCode);
        console.log("Response Header:");
        console.log(rest.ResponseHeader);
        console.log("Response Body:");
        console.log(sbResponseBody.GetAsString());
        return;
    }

    var jsonResponse = new chilkat.JsonObject();
    jsonResponse.LoadSb(sbResponseBody);

    jsonResponse.EmitCompact = false;
    console.log(jsonResponse.Emit());

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

    // {
    //   "Attributes": {
    //     "LastPostedBy": {
    //       "S": "fred@example.com"
    //     },
    //     "ForumName": {
    //       "S": "Amazon DynamoDB"
    //     },
    //     "LastPostDateTime": {
    //       "S": "201303201023"
    //     },
    //     "Tags": {
    //       "SS": [
    //         "Update",
    //         "Multiple Items",
    //         "HelpMe"
    //       ]
    //     },
    //     "Subject": {
    //       "S": "How do I update multiple items?"
    //     },
    //     "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

    var strVal;

    var AttributesLastPostedByS = jsonResponse.StringOf("Attributes.LastPostedBy.S");
    var AttributesForumNameS = jsonResponse.StringOf("Attributes.ForumName.S");
    var AttributesLastPostDateTimeS = jsonResponse.StringOf("Attributes.LastPostDateTime.S");
    var AttributesSubjectS = jsonResponse.StringOf("Attributes.Subject.S");
    var AttributesMessageS = jsonResponse.StringOf("Attributes.Message.S");
    var i = 0;
    var count_i = jsonResponse.SizeOfArray("Attributes.Tags.SS");
    while (i < count_i) {
        jsonResponse.I = i;
        strVal = jsonResponse.StringOf("Attributes.Tags.SS[i]");
        i = i+1;
    }


}

chilkatExample();