Document client abstraction in DynamoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a DynamoDB DocumentClient instance.

DynamoDB

const AWS = require('aws-sdk');
const docClient = new AWS.DynamoDB.[1]();

Drag options to blanks, or click blank then click option'

ADocumentClient

BClient

CService

DDocument

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Client' instead of 'DocumentClient' causes errors because 'Client' is not a valid class.

Using 'Service' or 'Document' alone are not valid constructors.

The DocumentClient is the abstraction layer for DynamoDB that simplifies working with items as JSON.

2fill in blank

medium

Complete the code to put an item into a DynamoDB table using DocumentClient.

DynamoDB

const params = {
  TableName: 'Users',
  Item: { id: '123', name: 'Alice' }
};
docClient.[1](params).promise();

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Aquery

Bput

Cget

Dscan

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'get' instead of 'put' will only retrieve data, not insert.

Using 'query' or 'scan' are for reading multiple items, not inserting.

The put method inserts or replaces an item in the table.

3fill in blank

hard

Fix the error in the code to get an item by key using DocumentClient.

DynamoDB

const params = {
  TableName: 'Products',
  Key: { productId: 'abc123' }
};
docClient.[1](params).promise();

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Aput

Bdelete

Cupdate

Dget

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'put' or 'update' will overwrite or modify data instead of reading.

Using 'delete' removes the item, not retrieves it.

The get method retrieves a single item by its key.

4fill in blank

hard

Fill both blanks to update an item attribute using DocumentClient.

DynamoDB

const params = {
  TableName: 'Orders',
  Key: { orderId: '789' },
  UpdateExpression: 'set [1] = :val',
  ExpressionAttributeValues: { ':val': [2] }
};
docClient.update(params).promise();

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Astatus

B'shipped'

C'delivered'

Dquantity

Attempts:

3 left

💡 Hint

Common Mistakes

Putting the value without quotes causes syntax errors.

Using a wrong attribute name will update the wrong field.

The UpdateExpression sets the attribute named in the first blank to the value in the second blank.

Here, we update the status attribute to the string 'delivered'.

5fill in blank

hard

Fill all three blanks to query items with a condition using DocumentClient.

DynamoDB

const params = {
  TableName: 'Employees',
  KeyConditionExpression: '[1] = :id',
  ExpressionAttributeNames: { '#name': '[2]' },
  ExpressionAttributeValues: { ':id': [3] }
};
docClient.query(params).promise();

Drag options to blanks, or click blank then click option'

AemployeeId

Bname

C'E123'

Ddepartment

Attempts:

3 left

💡 Hint

Common Mistakes

Using attribute names without quotes in ExpressionAttributeValues causes errors.

Mixing up attribute names and values leads to wrong queries.

The KeyConditionExpression uses the partition key attribute name in the first blank.

The ExpressionAttributeNames maps the placeholder #name to the actual attribute name in the second blank.

The ExpressionAttributeValues provides the value for the key in the third blank.