TheAlanWang

Notes

01.Create Dynamo DB

1 min read

DynamoDB is a regional service

Add boto3.s3` type stubs

pip install "boto3-stubs[dynamodb]"

DynamoDB Compulsory

  • Compulsory to create DynamoDB:
    • TableName
    • KeySchema
      • Partition key (HASH)
      • Sort key (Range)
    • AttributeDefinition
      • AttributeType:
        • S: String
        • N: Number
        • B: Binary
    • Capacity model
      • BillingMode="PAY_PER_REQUEST", on-Demand
      • Provisioned capacity,
        • set Read Capacity Units
        • set Write Capacity Units

Create Table

When creating a table, can only definite the key attributes used in the key schema.

def create_dynamoDB(tablename, region):
    dynamoDB = boto3.client("dynamodb", region_name=region)
    
    if check_table_exist(tablename, regions=region):
        print(f"--- Table:{tablename} exists ---")
        return
 
    try:
        dynamoDB.create_table(
            TableName=tablename,
            BillingMode="PAY_PER_REQUEST",
            AttributeDefinitions=[
                {"AttributeName": "bucket_name", "AttributeType": "S"},
                {"AttributeName": "timestamp", "AttributeType":"N"}
 
            ],
            KeySchema=[
                {"AttributeName": "bucket_name", "KeyType": "HASH"},
                {"AttributeName": "timestamp", "KeyType": "RANGE"}
            ]
        )
        print(f"--- Created Table:{tablename} ---")
    except ClientError as e:
        print(e)

Check exist Table

def check_table_exist(table, regions):
    dynamoDB = boto3.client("dynamodb", region_name=region)
    try:
        dynamoDB.describe_table(TableName=tablename)
        return True
    except ClientError as e:
        code = e.response.get("Error", {}).get("Code")
        if code == "404":
            return False # not exist
        if code == "403":
            print(f"--- AccessDenied ----")

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