dynamodb get all items by an array of ids - node.js

Question

I have a table with an attribute with name id and of type HASH. I want to get all items from a array of id's.
{
TableName: `MyTable`,
FilterExpression: 'id IN (:id)',
ExpressionAttributeValues: { ':id': ids },
};
What should I do to get all items by my ids?

Answer 1

You can also use DocumentClient and batchGet.
const AWS = require('aws-sdk');
const documentClient = new AWS.DynamoDB.DocumentClient();
let queryParams = {RequestItems: {}};
queryParams.RequestItems['tableName'] = {
Keys: [{'id': 'Value1'}, {'id': 'value2'}],
ProjectionExpression: 'id' //define other fileds that you have Ex: 'id,name'
};
documentClient.batchGet(queryParams, function (err, data) {
if (err) {
console.log('failure:getItemByBatch data from Dynamo error', err);
} else {
console.log('success:getItemByBatch data from Dynamo data');
console.log(data)
}
});

Answer 2

Please use BatchGetItem API to get multiple values from DynamoDB table.
BatchGetItem
Example:-
var dynamodb = new AWS.DynamoDB({maxRetries: 5, retryDelayOptions: {base: 300} });
var table = "Movies";
var year_val = 2015;
var title = "The Big New Movie";
var params = {
"RequestItems" : {
"Movies" : {
"Keys" : [ {
"yearkey" : {N : "2016"},
"title" : {S : "The Big New Movie 1"}
} ]
}
},
"ReturnConsumedCapacity" : "TOTAL"
};
dynamodb.batchGetItem(params, function(err, data) {
if (err) {
console.error("Unable to get item. Error JSON:", JSON.stringify(err,
null, 2));
} else {
console.log("Movie data:", JSON.stringify(data, null, 2));
}
});

Answer 3

Its in C#, below code is to get all items by an array of ids from a dynamodb table having different guid's using BatchGet or CreateBatchGet
string tablename = "AnyTableName"; //table whose data you want to fetch
var BatchRead = ABCContext.Context.CreateBatchGet<ABCTable>(
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 & data you want to fetch