playorm

问题 This may sound silly as there are no null values in SQL's composite primary key. But just want to confirm if we can have the same in CQL3? So, we have a table like this to store wide rows: CREATE TABLE keyspace12.colFamily1 ( id text, colname text, colvalue blob, PRIMARY KEY (id,colname, colvalue) ) WITH COMPACT STORAGE And we have some cases where colname is null. Can I do that? If yes, then how? If NO, then what are the ways to store wide columns rows where we can have some null in first

问题 Is there any sort of "How-To" for playORM? I'm just starting to work with it, and haven't been able to get any farther than importing the Ant build file into Eclipse. I didn't see anything like a readme in the unpacked tarball, besides a file in the examples/ directory that says "This is the examples directory" and a feature list in the main directory. Is there anything I can look at to get started using playORM, or is it just meant to be trial and error? 回答1: Very sorry, we are working on

问题 I would like to debate if PlayORM's virtual partitioning is the best way to partition data always, as compared to Cassandra's partitioning. Schema: TimeStamp Device ID Device Name Device Owner For a TimeStamp, there are 500 K rows, and for a particular Device ID, there are 10 K rows If I want to partition on 2 columns, say TimeStamp and Device ID. I have following ways this could be done: Use PlayORM to 'virtual' partition on both columns, such that data for any virtual partition by any

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . I want to do a POC and I would like a basic example of using playOrm. How do I create a basic project using eclipse and how do I