AWS DynamoDB ExclusiveStartKey default value
I'm trying to make a query to DynamoDB, and if a LastEvaluatedKey is returned (meaning the query exceeds 1 MB) I want to make other queries in order to fetch all the required data from the table, using LastEvaluatedKey as ExclusiveStartKey for the next query.
This is the code I have for now:
query_response = table.query(
KeyConditionExpression=Key('brand').eq(brand)
)
pagination_key = None
if 'LastEvaluatedKey' in query_response:
pagination_key = query_response['LastEvaluatedKey']
while pagination_key:
next_query_response = table.query(
KeyConditionExpression=Key('brand').eq(brand),
ExclusiveStartKey=pagination_key
)
However, I'd like to refacto this code by extracting the query into a method, passing it pagination_key as an argument. To do this, I'd have to be able to either set ExclusiveStartKey to False, None or some other default value for the first call but I didn't find anything on this, or I'd have to be able to exclude the ExclusiveStartKey alltogether, but I don't know how to do this either.
python amazon-dynamodb
edited Nov 12 at 14:56
Aqueous Carlos
289213
asked Nov 12 at 14:40
nicojonck
334
add a comment |
I'm trying to make a query to DynamoDB, and if a LastEvaluatedKey is returned (meaning the query exceeds 1 MB) I want to make other queries in order to fetch all the required data from the table, using LastEvaluatedKey as ExclusiveStartKey for the next query.
This is the code I have for now:
query_response = table.query(
KeyConditionExpression=Key('brand').eq(brand)
)
pagination_key = None
if 'LastEvaluatedKey' in query_response:
pagination_key = query_response['LastEvaluatedKey']
while pagination_key:
next_query_response = table.query(
KeyConditionExpression=Key('brand').eq(brand),
ExclusiveStartKey=pagination_key
)
However, I'd like to refacto this code by extracting the query into a method, passing it pagination_key as an argument. To do this, I'd have to be able to either set ExclusiveStartKey to False, None or some other default value for the first call but I didn't find anything on this, or I'd have to be able to exclude the ExclusiveStartKey alltogether, but I don't know how to do this either.
python amazon-dynamodb
edited Nov 12 at 14:56
Aqueous Carlos
289213
asked Nov 12 at 14:40
nicojonck
334
I know you can simply omit the ExclusiveStartKey or set it to null in the java sdk. Have you tried simply omitting that argument or setting it to None? What were your results?
– Matthew Pope
Nov 15 at 16:56
add a comment |
I'm trying to make a query to DynamoDB, and if a LastEvaluatedKey is returned (meaning the query exceeds 1 MB) I want to make other queries in order to fetch all the required data from the table, using LastEvaluatedKey as ExclusiveStartKey for the next query.
This is the code I have for now:
query_response = table.query(
KeyConditionExpression=Key('brand').eq(brand)
)
pagination_key = None
if 'LastEvaluatedKey' in query_response:
pagination_key = query_response['LastEvaluatedKey']
while pagination_key:
next_query_response = table.query(
KeyConditionExpression=Key('brand').eq(brand),
ExclusiveStartKey=pagination_key
)
However, I'd like to refacto this code by extracting the query into a method, passing it pagination_key as an argument. To do this, I'd have to be able to either set ExclusiveStartKey to False, None or some other default value for the first call but I didn't find anything on this, or I'd have to be able to exclude the ExclusiveStartKey alltogether, but I don't know how to do this either.
python amazon-dynamodb
edited Nov 12 at 14:56
Aqueous Carlos
289213
asked Nov 12 at 14:40
nicojonck
334
I'm trying to make a query to DynamoDB, and if a LastEvaluatedKey is returned (meaning the query exceeds 1 MB) I want to make other queries in order to fetch all the required data from the table, using LastEvaluatedKey as ExclusiveStartKey for the next query.
This is the code I have for now:
query_response = table.query(
KeyConditionExpression=Key('brand').eq(brand)
)
pagination_key = None
if 'LastEvaluatedKey' in query_response:
pagination_key = query_response['LastEvaluatedKey']
while pagination_key:
next_query_response = table.query(
KeyConditionExpression=Key('brand').eq(brand),
ExclusiveStartKey=pagination_key
)
However, I'd like to refacto this code by extracting the query into a method, passing it pagination_key as an argument. To do this, I'd have to be able to either set ExclusiveStartKey to False, None or some other default value for the first call but I didn't find anything on this, or I'd have to be able to exclude the ExclusiveStartKey alltogether, but I don't know how to do this either.
python amazon-dynamodb
python amazon-dynamodb
edited Nov 12 at 14:56
Aqueous Carlos
289213
asked Nov 12 at 14:40
nicojonck
334
edited Nov 12 at 14:56
Aqueous Carlos
289213
asked Nov 12 at 14:40
nicojonck
334
edited Nov 12 at 14:56
Aqueous Carlos
289213
edited Nov 12 at 14:56
Aqueous Carlos
289213
edited Nov 12 at 14:56
Aqueous Carlos
289213
289213
asked Nov 12 at 14:40
nicojonck
334
asked Nov 12 at 14:40
nicojonck
334
asked Nov 12 at 14:40
nicojonck
334
334
I know you can simply omit the ExclusiveStartKey or set it to null in the java sdk. Have you tried simply omitting that argument or setting it to None? What were your results?
– Matthew Pope
Nov 15 at 16:56
add a comment |
I know you can simply omit the ExclusiveStartKey or set it to null in the java sdk. Have you tried simply omitting that argument or setting it to None? What were your results?
– Matthew Pope
Nov 15 at 16:56
I know you can simply omit the ExclusiveStartKey or set it to null in the java sdk. Have you tried simply omitting that argument or setting it to None? What were your results?
– Matthew Pope
Nov 15 at 16:56
I know you can simply omit the ExclusiveStartKey or set it to null in the java sdk. Have you tried simply omitting that argument or setting it to None? What were your results?
– Matthew Pope
Nov 15 at 16:56
add a comment |
1 Answer
1
active
oldest
votes
I found an easy way of building the parameters:
query_params = 'KeyConditionExpression': Key('brand').eq(brand)
if pagination_key:
query_params['ExclusiveStartKey'] = pagination_key
query_response = table.query(query_params)
answered Dec 7 at 11:26
nicojonck
334
add a comment |
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1 Answer
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votes
1 Answer
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active
oldest
votes
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oldest
votes
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oldest
votes
I found an easy way of building the parameters:
query_params = 'KeyConditionExpression': Key('brand').eq(brand)
if pagination_key:
query_params['ExclusiveStartKey'] = pagination_key
query_response = table.query(query_params)
answered Dec 7 at 11:26
nicojonck
334
add a comment |
I found an easy way of building the parameters:
query_params = 'KeyConditionExpression': Key('brand').eq(brand)
if pagination_key:
query_params['ExclusiveStartKey'] = pagination_key
query_response = table.query(query_params)
answered Dec 7 at 11:26
nicojonck
334
add a comment |
I found an easy way of building the parameters:
query_params = 'KeyConditionExpression': Key('brand').eq(brand)
if pagination_key:
query_params['ExclusiveStartKey'] = pagination_key
query_response = table.query(query_params)
answered Dec 7 at 11:26
nicojonck
334
I found an easy way of building the parameters:
query_params = 'KeyConditionExpression': Key('brand').eq(brand)
if pagination_key:
query_params['ExclusiveStartKey'] = pagination_key
query_response = table.query(query_params)
answered Dec 7 at 11:26
nicojonck
334
answered Dec 7 at 11:26
nicojonck
334
answered Dec 7 at 11:26
nicojonck
334
answered Dec 7 at 11:26
nicojonck
334
334
add a comment |
add a comment |
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I know you can simply omit the ExclusiveStartKey or set it to null in the java sdk. Have you tried simply omitting that argument or setting it to None? What were your results?
– Matthew Pope
Nov 15 at 16:56