在特定日期之间查询 DynamoDB -NodeJs

Question

I'm trying to query Dynamo DB for person_id between two dates. I have errors with the following code:

Please note that the primary key of the table is (event_id), but I'm not sure how/where to use it?

 var params = { TableName: "tableName", IndexName: "person_id-event_date-index", FilterExpression: "#person_id =:person_id", KeyConditionExpression: "#person_id =:person_id and #event_date BETWEEN:from AND:to", ExpressionAttributeNames: { "#person_id": "person_id", "#event_date": "event_date" }, ExpressionAttributeValues: { ":person_id": person_id, ":from": start_date, ":to": end_date } } documentClient.query(params, function(err, data) { if (err) { console.error("Unable to query. Error:", JSON.stringify(err, null, 2)); callback(new Error(JSON.stringify(err))) } else { callback(null, data); } });

Can anyone please check how to make this working?

Many thanks

Answer 1

Short answer, you cannot do that unless the Table has some GSI (Global Secondary Indexes) set up that allow for that sort of query.

When doing a query you must pass a primary key value, you cannot do a query otherwise.

Considering that you want to query based on a different column, not the primary key, you need to see if you have an index defined with

• PrimaryKey = person_id and
• RangeKey = event_date

If such an index is note defined you may rely on scan , but that's not recommended.

Answer 2

Here is the fix code:

 var params = { TableName: "tableName", IndexName: "person_id-event_date-index", KeyConditionExpression: "#person_id =:person_id and #event_date BETWEEN:from AND:to", ExpressionAttributeNames: { "#person_id": "person_id", "#event_date": "event_date" }, ExpressionAttributeValues: { ":person_id": person_id, ":from": start_date, ":to": end_date } } documentClient.query(params, function(err, data) { if (err) { console.error("Unable to query. Error:", JSON.stringify(err, null, 2)); callback(new Error(JSON.stringify(err))) } else { callback(null, data); } }); }