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In my project, I use the spring, but the cassandra cannot support transaction. How to operate the transaction of cassandra in service layer?
You can log every transaction you carry out, store them in a log file of some sort and when you want to undo it create a query that does the opposite of what you just did.
You need to think differently in noSQL. Read Building on Quicksand http://www-db.cs.wisc.edu/cidr/cidr2009/Paper_133.pdf. If using cassandra, you may want to check out PlayOrm as well and the nosql patterns page.
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I'm planning to use Node for my next project, because it seems to be a good fit for the problem I'm solving.
One thing I need to figure out is optimistic and pessimistic locking. http://guides.rubyonrails.org/active_record_querying.html#locking-records-for-update
Say, the user has a balance of 1. Two Node instances make requests concurrently to withdraw 1. The two requests could pass the check of sufficient balance at the same time, thus making two successful withdrawals resulting in a balance of -1.
Rails provides a wrapper around Postgres transactional and locking features. Does some kind of similar wrapper exist for Node?
How do you solve this in Node/Postgresql?
I know this is a database feature, but I wonder if Node or some library provides a abstraction away from writing raw SQL queries?
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incr like_unlike_counter1234['b']['total']by 1 with ttl=10;
How to implement ttl in counter column .There is any way for that?
No, counter columns don't support TTLs. See Jira issue CASSANDRA-2103 for the technical details why this is tricky.
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I'm trying to find any limitation for CouchDB. I need to know how much documents that Couch can contain. could their _id be used up ?. or another limitation posed by CouchDB since i rely on couchDB for many project lately.
Thanks
The amount of stored documents in CouchDB is only limited by available disk space for database files. You can limit maximum document size (in bytes) with couchdb/max_document_size option, but you cannot set any limits for document's count within single database.
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How to create a views in Cassandra,Can you give me an example, which data is coming from two or more tables.
You can't create views in Cassandra. Just like you can't do joins. It's not that kind of a database. With Cassandra you model your schema differently and you denormalize.
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I'm looking for a way to create a rule for StyleCop, Resharper, Visual Studio itself or at least a add in which show me a visual warning if a method is longer than X characters / longer than X lines.
Anyone some working solutions?
This is a very simple rule to create with StyleCop. If you don't feel like rolling your own, StyleCop+ includes such a rule that is configurable to your preferred maximum method length.