Library . Amazon . DynamoDB . GetItem

Returns a set of attributes for the item with the given primary key.

Input
• AWSAccessKeyId The Access Key ID provided by Amazon Web Services.
• AWSSecretKeyId The Secret Key ID provided by Amazon Web Services.
• Key A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
• TableName The name of the table containing the requested items.
Optional Input
• ConsistentRead Determines the read consistency model: If set to true, then the operation uses strongly consistent reads; otherwise, the operation uses eventually consistent reads.
• ExpressionAttributeNames One or more substitution tokens for attribute names in an expression.
• ProjectionExpression A string that identifies one or more attributes to retrieve from the table.
• ReturnConsumedCapacity Determines the level of detail about provisioned throughput consumption that is returned in the response. Valid values are: INDEXES, TOTAL, NONE.
• UserRegion The AWS region that corresponds to the S3 endpoint you wish to access. The default region is "us-east-1".
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• Output
  Actuator Trigger Condition

  If{"Response":{"type":"json","description":"The response from Amazon."},"Success":{"type":"boolean"}}ResponseSuccess then write

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  • Response The response from Amazon.
• CHOREO CLASS

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  Code

  • // Instantiate the Choreo, using a previously instantiated TembooSession object, eg:
    // TembooSession session = new TembooSession("accountName", "myFirstApp", "abc123xxxxxxxxxxxxxx");
    
    GetItem getItemChoreo = new GetItem(session);
    
    // Get an InputSet object for the choreo
    GetItemInputSet getItemInputs = getItemChoreo.newInputSet();
    
    // Set inputs
    
    // Execute Choreo
    GetItemResultSet getItemResults = getItemChoreo.execute(getItemInputs);

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• Notes

  • This Choreo returns a set of attributes for the item with the given primary key. The documentation for this DynamoDB resource can be found here.

    Here is an example input set:

    AWSAccessKeyId: {YOUR ACCESS KEY ID}
    AWSSecretKeyId: {YOUR SECRET ACCESS KEY}
    TableName: Thread
    ProjectionExpression: LastPostDateTime, Message, Tags
    ConsistentRead: true
    ReturnConsumedCapacity: TOTAL
    Key:

    {
      "ForumName": {
        "S": "Amazon DynamoDB"
      },
      "Subject": {
        "S": "How do I update multiple items?"
      }
    }

    The following is a sample of the JSON information returned by this Choreo:

     {
        "ConsumedCapacity": {
            "CapacityUnits": 1,
            "TableName": "Thread"
        },
        "Item": {
            "Tags": {
                "SS": ["Update","Multiple Items","HelpMe"]
            },
            "LastPostDateTime": {
                "S": "201303190436"
            },
            "Message": {
                "S": "I want to update multiple items in a single API call. What's the best way to do that?"
            }
        }
    }