Amazon Web Services: Delete item on DynamoDB Database from Lambda Function

Question

How can I delete an item from a DynamoDB database from a Lambda function. I know how to put and item. Here is working code:

dynamo.putItem({
            "TableName": "Table",
            "Item": item
        }, function(err, data) {
            if (err) {
                console.log("Failure: " + err);
                context.succeed("Failure!");
                context.done();
            } else {
                console.log("Success!");
                context.succeed("Success!");
                context.done();
            }
        });

veggiebenz · Accepted Answer · 2015-08-26 02:15:18Z

3

this works for me... omitting the lambda boilerplate stuff...

    var tableName = "Users"
dynamodb.deleteItem({
    "TableName": tableName, 
    "Key" : {
        "UserId": event.UserId
    }
}, function (err, data) {
    if (err) {
        context.fail('FAIL:  Error deleting item from dynamodb - ' + err);
    }
    else {
        console.log("DEBUG:  deleteItem worked. ");
        context.succeed(data);
    }
});

answered Aug 26, 2015 at 2:15

veggiebenz

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newbie · Accepted Answer · 2015-09-08 11:51:53Z

0

Correction to the code above, this is working :

var tableName = "Users";
dynamodb.deleteItem({
    "TableName": tableName, 
    "Key" : {
        "UserId": {
            "N" : event.userId.toString()
         }
    }
}, function (err, data) {
    if (err) {
        context.fail('FAIL:  Error deleting item from dynamodb - ' + err);
    } else {
        console.log("DEBUG:  deleteItem worked. ");
        context.succeed(data);
    }
});

answered Sep 8, 2015 at 11:51

newbie

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Hasoun GH · Accepted Answer · 2019-09-19 05:24:23Z

0

const AWS = require('aws-sdk');
const ddb = new AWS.DynamoDB.DocumentClient();

exports.handler = (event, context, callback) => {
  const connectionId = event.requestContext.connectionId;
  deleteConnectionId(connectionId).then(() => {
    callback(null, { statusCode: 200 , message: 'userId deleted'});
  });
};


function deleteConnectionId(connectionId) {
  return ddb
    .delete({ TableName: 'your table name', 
        Key: {
            userId : connectionId.toString() // userId is my PK in this case
         }
    } )
    .promise();
}

answered Sep 19, 2019 at 5:24

Hasoun GH

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