How can I fetch all items from a DynamoDB table without specifying the primary key

Question

I have a table called products with primary key Id  I want to select all items in the table  This is the code is I m using    batch get response    dynamodb- gt batch get item array       RequestItems    gt  array            products    gt  array               Keys    gt  array                  array     Key  1                      HashKeyElement     gt  array  AmazonDynamoDB  TYPE NUMBER   gt   1                         RangeKeyElement    gt  array  AmazonDynamoDB  TYPE NUMBER   gt   current time                                      array     Key  2                      HashKeyElement     gt  array  AmazonDynamoDB  TYPE NUMBER   gt   2                         RangeKeyElement    gt  array  AmazonDynamoDB  TYPE NUMBER   gt   current time                                                             Is it possible to select all items without specifying the primary key  I m using the AWS SDK for PHP

User · Answer

I fetch all items from dynamodb with the following query  It works fine  i create these function generic in zend framework and access these functions over the project           public function getQuerydata  tablename   filterKey   filterValue               return  this- gt getQuerydataWithOp  tablename   filterKey   filterValue   EQ                       public function getQuerydataWithOp  tablename   filterKey   filterValue   compOperator            result    this- gt getClientdb  - gt query array                   TableName        gt   tablename                   IndexName        gt   filterKey                   Select           gt   ALL ATTRIBUTES                    KeyConditions    gt  array                       filterKey   gt  array                           AttributeValueList    gt  array                              array  S    gt   filterValue                                              ComparisonOperator    gt   compOperator                                                     return  result  Items                        Below i Access these functions and get data          accountsimg    this- gt getQuerydataWithPrimary  accounts    accountID   msgdata 0   accountID    S

User · Answer

Hi you can download using boto3  In python import boto3 from boto3 dynamodb conditions import Key  Attr  dynamodb   boto3 resource  dynamodb   table   dynamodb Table  Table   response   table scan   items   response  Items   while  LastEvaluatedKey  in response      print response  LastEvaluatedKey        response   table scan ExclusiveStartKey response  LastEvaluatedKey        items extend response  Items

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A simple code to list all the Items from DynamoDB Table by specifying the region of AWS Service  import boto3  dynamodb   boto3 resource  dynamodb   region name  ap-south-1   table   dynamodb Table  puppy store   response   table scan   items   response  Items      Prints All the Items at once print items     Prints Items line by line for i  j in enumerate items       print f quot Num   i  -- gt   j  quot

User · Answer

I figured you are using PHP but not mentioned  edited   I found this question by searching internet and since I got solution working   for those who use nodejs here is a simple solution using scan     var dynamoClient   new AWS DynamoDB DocumentClient      var params         TableName  config dynamoClient tableName     give it your table name      Select   quot ALL ATTRIBUTES quot          dynamoClient scan params  function err  data        if  err           console error  quot Unable to read item  Error JSON  quot   JSON stringify err  null  2          else          console log  quot GetItem succeeded  quot   JSON stringify data  null  2                 I assume same code can be translated to PHP too using different AWS SDK

User · Answer

This C  code is to fetch all items from a dynamodb table using BatchGet or CreateBatchGet          string tablename    AnyTableName     table whose data you want to fetch          var BatchRead   ABCContext Context CreateBatchGet lt ABCTable gt                  new DynamoDBOperationConfig                               OverrideTableName   tablename                            foreach string Id in IdList     in case you are taking string from input                       Guid objGuid   Guid Parse Id     parsing string to guid             BatchRead AddKey objGuid                      await BatchRead ExecuteAsync            var result   BatchRead Results       ABCTable is the table modal which is used to create in dynamodb  amp  data you want to fetch

User · Answer

Amazon DynamoDB provides the Scan operation for this purpose  which returns one or more items and its attributes by performing a full scan of a table  Please be aware of the following two constraints    Depending on your table size  you may need to use pagination to retrieve the entire result set          Note   If the total number of scanned items exceeds the 1MB limit  the   scan stops and results are returned to the user with a   LastEvaluatedKey to continue the scan in a subsequent operation  The   results also include the number of items exceeding the limit  A scan   can result in no table data meeting the filter criteria       The result set is eventually consistent   The Scan operation is potentially costly regarding both performance and consumed capacity units  i e  price   see section Scan and Query Performance in Query and Scan in Amazon DynamoDB            Also  as a table grows  the scan operation slows  The scan   operation examines every item for the requested values  and can use up   the provisioned throughput for a large table in a single operation    For quicker response times  design your tables in a way that can use   the Query  Get  or BatchGetItem APIs  instead  Or  design your   application to use scan operations in a way that minimizes the impact   on your table s request rate  For more information  see Provisioned   Throughput Guidelines in Amazon DynamoDB   emphasis mine     You can find more details about this operation and some example snippets in Scanning Tables Using the AWS SDK for PHP Low-Level API for Amazon DynamoDB  with the most simple example illustrating the operation being    dynamodb   new AmazonDynamoDB      scan response    dynamodb- gt scan array       TableName    gt   ProductCatalog        foreach   scan response- gt body- gt Items as  item        echo   lt p gt  lt strong gt Item Number  lt  strong gt               string   item- gt Id- gt  AmazonDynamoDB  TYPE NUMBER       echo   lt br gt  lt strong gt Item Name   lt  strong gt               string   item- gt Title- gt  AmazonDynamoDB  TYPE STRING     lt  p gt

[php] How can I fetch all items from a DynamoDB table without specifying the primary key?

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