问题
I'm using dynamoDB with boto, and having a bit of a problem in the design/query of my table.
I'd like my data to look something like
+---------------------------------------+
hash_key account_id mykey
-----------------------------------------
1 12345 myvalue1
2 12345 myvalue2
3 12345 myvalue3
4 123456 myvalue4
+---------------------------------------+
And then retrieve all data for account 12345. Looking at the boto docs, I always need to have the hash_key available. I know how I would query this standard SQL / MongoDB, but I can't find a solution for boto. I assume this is possible? Thanks!
EDIT: This seems to work
+---------------------------------------+
hash_key range_key mykey
-----------------------------------------
12345 12568 myvalue1
12345 53890 myvalue2
12345 12322 myvalue3
123456 23432 myvalue4
+---------------------------------------+
Followed by
> res = table.query(hash_key='12345')
> for item in res:
> print i
Since I want to grab all the entries with account # 12345, regardless of the range_key, I need to query instead of get_item
回答1:
I would use the account_id as the hash_key along with some range_key to differentiate them.
In DynamoDB, the primary key is composed of a (hash_key, range_key) range_key being optional. This tuple needs to be unique. Note that you will need the whole tuple to access a given element with get_item.
Having an 'auto_increment' hash_key is a bad habit from the SQL world.
If you want to know more on this subject, I wrote some background do on modeling data in the dynamodb-mapper documentation: http://dynamodb-mapper.readthedocs.org/en/latest/api/model.html#auto-increment-when-to-use
来源：https://stackoverflow.com/questions/12484635/query-dynamodb-with-non-hash-key-field-with-boto-python