How to retrieve multiple items from Dynamo DB using AWS lambda - amazon-web-services

Question

How to get multiple items from DB. the below code throws me an error as it fetches only one item. I am retrieving the items based on email value.
import json
import os
import boto3
import decimalencoder
dynamodb = boto3.resource('dynamodb')
def get(event, context):
table = dynamodb.Table(os.environ['DYNAMODB_TABLE'])
# fetch a person from the database
result = table.get_item(
Key={
'email': event['pathParameters']['email']
}
)
# create a response
response = {
"statusCode": 200,
"body": json.dumps(result['Item'], cls=decimalencoder.DecimalEncoder),
"headers": {
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Credentials": "true"
}
}
return response

Answer 1

To retrive multiple rows from db, first query on id you want data to be filtered.
Then maintain a list to store all row values in it.
def lambda_handler(event,context):
item = table.query(
KeyConditionExpression=Key('hubID').eq(hubId)
)
if (item["Count"] == 0):
response = {"msg": "Item not exist, can't perform READ"}
else:
i = 1
lst = []
while i < item["Count"]:
response = {
"hubId" : item["Items"][i]["hubID"],
"deviceState": int(item["Items"][i]["deviceState"]),
"deviceId": item["Items"][i]["deviceID"],
"deviceType": item["Items"][i]["deviceType"],
"intensity": int(item["Items"][i]["intensity"])
}
lst.append(response)
i += 1
print(lst)
response = lst
return response