DDB | Dictionary DataBase | Dictionary library
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kandi X-RAY | DDB Summary
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- Return True if the query matches the given query .
- Insert a new item .
- Convert to a list .
- Return a copy of self . d .
- Return a new DDB that matches the given query .
- Initialize the model .
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Trending Discussions on DDB
QUESTION
I looked at documentation but couldn't find an answer for that. I am trying to add "rating" of type "float" inside custom lambda function. All I see for items are written as {S: date.toISOString()}. Here "S" stands for I think string, but what if I want it to be a float?
...ANSWER
Answered 2022-Apr-03 at 15:22The type for numbers is "N".
This is documented https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DynamoDBMapper.DataTypes.html.
DynamoDB has just one number type - an unusual decimal floating point type that can be used to represent either floats or integers. So you don't need to tell it if the number is an integer or a float - you just tell it it's a number.
QUESTION
I'm attempting to retrieve an item from DynamoDB with a Lambda function and always get the same error:
ValidationException The provided key element does not match the schema
This is how I am currently attempting to pull the data. myAttribute is not a string, as seen here. Since value is a variable taken from queryStringParamters, I am using the DocumentClient which supports native JS types:
ANSWER
Answered 2022-Mar-20 at 20:11You're using the get method of the Document Client, which maps to the underlying GetItem API call. This API call requires the entire primary key to return the item. In your case, that means you would have to know the partition/hash and sort/range key of your item.
Since that's not the case as you mention in the comments, I suggest you use the Query API. Query operates on item collections (all items that share a partition key) and allows you to return the whole item collection or filter in the item collection based on the sort key.
QUESTION
I have a DynamoDB table whose items have these attributes: id, user, status. Status can take values A or B.
- Is it possible to trigger a lambda based on only the value of attribute 'status' ?
Example, trigger the lambda when a new item is added to DDB with status == A or when the status of an existing item is updated to A. (I am looking into DynamoDB streams for achieving this, but I have not come across an example where anyone is using it for this use case.)
- Is it possible to monitor a DDB based on value of a certain attribute ?
Example, when status == B, I don't want to trigger lambda, but only emit a metrics for that row. Basically, I want to have a metrics to see how many items in the table have status == B at a given point.
If not from DynamoDB , are the above two possible for any other storage type ?
...ANSWER
Answered 2022-Mar-06 at 22:23Yes, as your initial research has uncovered, this is something you'll want to use DynamoDB Streams for.
You can trigger a lambda function based on an item being written, updated, or removed from Dynamo DB, and you can configure your stream subscription to filter on only attributes and values you care about.
DynamoDB recently introduced the ability to filter stream events before invoking your function, you can read more about how that works and how to configure it here
For more information about DynamoDB Stream use cases, this post may be helpful.
QUESTION
I have the following code to update one DynamoDB attribute:
...ANSWER
Answered 2022-Mar-03 at 12:33Sorry, no. There’s just the one condition expression
QUESTION
I'm using react-query to make two separate queries in the same React component. I originally tried using two useQuery hooks:
ANSWER
Answered 2021-Sep-08 at 18:18No, this is not the correct syntax for useQueries. You can't pass a useQuery hook in as queryFn - the queryFn needs the function that fetches the data, in your case, that would be fetchData(chartId, "models").
The root cause of your initial problem however seems to be that your condition only waits until one of the queries has finished loading:
QUESTION
Kinesis data firehose has a default format to add files into separate partitions in S3 bucket which looks like : s3://bucket/prefix/yyyy/MM/dd/HH/file.extension
I have created event streams to dump data from DynamoDB to S3 using Firehose. There is a transformation lambda in between which converts DDB records into TSV format (tab separated).
All of this is added on an existing table which already contains huge data. I need to backfill the existing data from DynamoDB to S3 bucket maintaining the parity in format with existing Firehose output style.
Solution I tried :
Step 1 : Export the Table to S3 using DDB Export feature. Use Glue crawler to create Data catalog Table.
Step 2 : Used Athena's CREATE TABLE AS SELECT Query to imitate the transformation done by the intermediate Lambda and storing that Output to S3 location.
Step 3 : However, Athena CTAS applies a default compression that cannot be done away with. So I wrote a Glue Job that reads from the previous table and writes to another S3 location. This job also takes care of adding the partitions based on year/month/day/hour as is the format with Firehose, and writes the decompressed S3 tab-separated format files.
However, the problem is that Glue creates Hive-style partitions which look like :
s3://bucket/prefix/year=2021/month=02/day=02/. And I need to match the firehose block style S3 partitions instead.
I am looking for an approach to help achieve this. Couldn't find a way to add block style partitions using Glue. Another approach I have is, to use AWS CLI S3 mv command to move all this data into separate folders with correct file-name which is not clean and optimised.
ANSWER
Answered 2022-Feb-22 at 12:40Leaving the solution I ended up implementing here in case it helps anyone.
I created a Lambda and added S3 event trigger on this bucket. The Lambda did the job of moving the file from Hive-style partitioned S3 folder to correctly structured block-style S3 folder.
The Lambda used Copy and delete function from boto3 s3Client to implement the same. It worked like a charm even though I had like > 10^6 output files split across different partitions.
QUESTION
I have created a model that was working when I had my backend functions running on my local machine, but when it uses AWS I get and authentication problem when the table is being queried:
...ANSWER
Answered 2022-Feb-18 at 15:23Disclaimer: this answer is based on Dynamoose v3.0.0 beta 1. Answers based on beta versions can become outdated quickly, so be sure to check for any updated details for your version of Dynamoose.
In Dynamoose v3, a new class was introduced called Table. This represents a single DynamoDB Table. In previous versions of Dynamoose, a Model represented a single DynamoDB Table, but based on the API also kinda represented a specific entity or model in your data structure (ex. Movie, Order, User, etc). This lead to complications and confusion when it comes to single table design structures especially.
In terms of code, what this means is the following.
QUESTION
I have made a python script to find the subnet mask for the given number of host. But I want it to take HTML input on button click and pass it as user input in python script and give the output on same HTML page. I have tried to give you guys max details of this program I'm not able to understand the problem. it shows taking input in url like here the terminal output is for input 500
urls.py
...ANSWER
Answered 2022-Feb-14 at 13:54you can check if noofhost_input is empty upon submission from browser because I think your form input submission action is overwritten (see below):
QUESTION
So I'm trying to delete two records for the same user. However, when I run the Lambda function below it really does not console log either a success or failure and the records are not deleted in DynamoDB. Any advice on how I could modify the below to get the expected result of having both records deleted would be appreciated. Thanks
- Included several console logs for troubleshooting
- both PK and SK are strings in DynamoDB
- Both delete request are for the same user just two different entries in the same table
ANSWER
Answered 2022-Feb-12 at 20:15You are not waiting for the batchWrite call to complete, the lambda terminates before actually sending the request to DynamoDB. Your handler is async, so you can do :
QUESTION
Hello have a simple Dockerfile which has to create the DynamoDB tables:
...ANSWER
Answered 2022-Feb-10 at 11:04In your command you must not have a space after \ that why maybe you recevie the error because the rest statements is ignored.
Try test again with this :
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