Is it possible to use `ADD` function with DynamoDBMapper save expression
I'm using DynamoDBMapper DynamoDBSaveExpression to save objects into database and have a specific requirement.
In case object doesn't exist in database I want to insert it, otherwise I want to increase counter attached to the object by 1.
There is ADD function which should work for me, but I don't see any way how to use it with mapper.
Any help would be appreciated.
amazon-dynamodb
asked Dec 28 '18 at 0:24
Orest
2,69352146
add a comment |
I'm using DynamoDBMapper DynamoDBSaveExpression to save objects into database and have a specific requirement.
In case object doesn't exist in database I want to insert it, otherwise I want to increase counter attached to the object by 1.
There is ADD function which should work for me, but I don't see any way how to use it with mapper.
Any help would be appreciated.
amazon-dynamodb
asked Dec 28 '18 at 0:24
Orest
2,69352146
Just to say, if you are trying to implement object versioning, you could just use dynamodbmapper optimistic locking docs.aws.amazon.com/amazondynamodb/latest/developerguide/…
– Stu
Dec 29 '18 at 9:31
Interesting, actually I want to have a counter on a row which would be increased every time I see the same hash + range key, but it seems that versioning would do the same for me. Thanks for the suggestion @Stu
– Orest
Dec 29 '18 at 19:14
add a comment |
I'm using DynamoDBMapper DynamoDBSaveExpression to save objects into database and have a specific requirement.
In case object doesn't exist in database I want to insert it, otherwise I want to increase counter attached to the object by 1.
There is ADD function which should work for me, but I don't see any way how to use it with mapper.
Any help would be appreciated.
amazon-dynamodb
asked Dec 28 '18 at 0:24
Orest
2,69352146
I'm using DynamoDBMapper DynamoDBSaveExpression to save objects into database and have a specific requirement.
In case object doesn't exist in database I want to insert it, otherwise I want to increase counter attached to the object by 1.
There is ADD function which should work for me, but I don't see any way how to use it with mapper.
Any help would be appreciated.
amazon-dynamodb
amazon-dynamodb
asked Dec 28 '18 at 0:24
Orest
2,69352146
asked Dec 28 '18 at 0:24
Orest
2,69352146
edited Dec 28 '18 at 17:32
asked Dec 28 '18 at 0:24
Orest
2,69352146
asked Dec 28 '18 at 0:24
Orest
2,69352146
asked Dec 28 '18 at 0:24
Orest
2,69352146
2,69352146
Just to say, if you are trying to implement object versioning, you could just use dynamodbmapper optimistic locking docs.aws.amazon.com/amazondynamodb/latest/developerguide/…
– Stu
Dec 29 '18 at 9:31
Interesting, actually I want to have a counter on a row which would be increased every time I see the same hash + range key, but it seems that versioning would do the same for me. Thanks for the suggestion @Stu
– Orest
Dec 29 '18 at 19:14
add a comment |
Just to say, if you are trying to implement object versioning, you could just use dynamodbmapper optimistic locking docs.aws.amazon.com/amazondynamodb/latest/developerguide/…
– Stu
Dec 29 '18 at 9:31
Interesting, actually I want to have a counter on a row which would be increased every time I see the same hash + range key, but it seems that versioning would do the same for me. Thanks for the suggestion @Stu
– Orest
Dec 29 '18 at 19:14
Just to say, if you are trying to implement object versioning, you could just use dynamodbmapper optimistic locking docs.aws.amazon.com/amazondynamodb/latest/developerguide/…
– Stu
Dec 29 '18 at 9:31
Just to say, if you are trying to implement object versioning, you could just use dynamodbmapper optimistic locking docs.aws.amazon.com/amazondynamodb/latest/developerguide/…
– Stu
Dec 29 '18 at 9:31
Interesting, actually I want to have a counter on a row which would be increased every time I see the same hash + range key, but it seems that versioning would do the same for me. Thanks for the suggestion @Stu
– Orest
Dec 29 '18 at 19:14
Interesting, actually I want to have a counter on a row which would be increased every time I see the same hash + range key, but it seems that versioning would do the same for me. Thanks for the suggestion @Stu
– Orest
Dec 29 '18 at 19:14
add a comment |
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Just to say, if you are trying to implement object versioning, you could just use dynamodbmapper optimistic locking docs.aws.amazon.com/amazondynamodb/latest/developerguide/…
– Stu
Dec 29 '18 at 9:31
Interesting, actually I want to have a counter on a row which would be increased every time I see the same hash + range key, but it seems that versioning would do the same for me. Thanks for the suggestion @Stu
– Orest
Dec 29 '18 at 19:14