Learning Objectives:
1. To learn a SQL-compatible query language (PartiQL) with Amazon DynamoDB.
2. To learn PartiQL Statements to SELECT, INSERT, UPDATE and DELETE in DynamoDB.
Step 1: Follow Step 1, 2, 3 and 4 from this blog to create Cloud9 environment.
Step 2: Copy the below code in your “create_table.py” file.
CODE
import boto3
from decimal import Decimal
# Initialize the DynamoDB resource and client
dynamodb = boto3.resource('dynamodb')
client = boto3.client('dynamodb')
# Define the table name
table_name = 'Movies'
# Create the DynamoDB table
try:
table = dynamodb.create_table(
TableName=table_name,
KeySchema=[
{
'AttributeName': 'year',
'KeyType': 'HASH' # Partition key
},
{
'AttributeName': 'title',
'KeyType': 'RANGE' # Sort key
}
],
AttributeDefinitions=[
{
'AttributeName': 'year',
'AttributeType': 'N' # Numeric
},
{
'AttributeName': 'title',
'AttributeType': 'S' # String
}
],
ProvisionedThroughput={
'ReadCapacityUnits': 5,
'WriteCapacityUnits': 5
}
)
# Wait for the table to be created
table.meta.client.get_waiter('table_exists').wait(TableName=table_name)
print(f"Table '{table_name}' created successfully.")
except client.exceptions.ResourceInUseException:
print(f"Table '{table_name}' already exists.")
# Add items to the table
movies_data = [
{
'year': 1994,
'title': 'The Shawshank Redemption',
'info': {
'plot': 'Two imprisoned men bond over a number of years, finding solace and eventual redemption through acts of common decency.',
'rating': Decimal('9.3') # Use Decimal for rating
}
},
{
'year': 1972,
'title': 'The Godfather',
'info': {
'plot': 'The aging patriarch of an organized crime dynasty transfers control of his clandestine empire to his reluctant son.',
'rating': Decimal('9.2') # Use Decimal for rating
}
},
{
'year': 2008,
'title': 'The Dark Knight',
'info': {
'plot': 'When the menace known as The Joker emerges from his mysterious past, he wreaks havoc and chaos on the people of Gotham.',
'rating': Decimal('9.0') # Use Decimal for rating
}
}
]
table = dynamodb.Table(table_name)
for movie in movies_data:
table.put_item(Item=movie)
print("Items added to the table.")
After copying the code save the file using Ctrl+S.
In the terminal execute the following command.
python create_table.py
You can go to DynamoDB service and check your Table is created and in Explore Items you can see the Items are added.
Step 3: In the left panel click on PartiQL editor, in the query box copy the following query and paste it and then click on Run.
SELECT * FROM Movies WHERE year = 1994;
You can after running the query, you get the item returned for the year given.
Step 4: Click on + icon.
In the Query 2, write the following query to insert an item into the table.
INSERT INTO "Movies" value {'year' : 2023,'title' : 'Movie 1','info':{'plot':'Thriller movie must watch','rating':4.5}};
Click on Run.
In Explore Items, you can see the item is added in the table.
Step 5: Similarly now copy the below query in Query Box.
UPDATE Movies
SET info = 'ABC', rating = 6.7
WHERE year = 1994 AND title = 'The Shawshank Redemption';
Then Click on Run.
You can see the updated item in the Explore Items section.
Step 6: Go back to PartiQL editor and copy the below command in Query box
DELETE FROM "Movies" WHERE "year" = 1994 AND "title" = 'The Shawshank Redemption';
Then click on Run.
You can the item is deleted from the table.
Note: Delete the Table from DynamoDB and also delete the Cloud9 environment, if no longer in use.
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