database-versioning | 易学教程

Row versioning in MySQL

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问题 I would like to include an integer version field in my table, auto-incrementing on each update made to a row. Is it possible to do this in MySQL? Please note that I'm not talking about a TIMESTAMP , which is not reliable as two concurrent updates might happen during the same second. 回答1: The only way (I can think of) to do this is a (before-update) trigger that automatically increments the column value. 回答2: Yes it is. The more general problem is called slowly changing dimensions. 来源： https:/

CouchDB versioning strategy

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Would the following be a viable strategy for implementing versioning(using "example" as a sample document type): Have one original document where the type field is named example_original. Subsequent changes to the document all have type example_change and the id of example_original document as a key. The change would also carry a timestamp. Keep one doc with type example_current that is the result of example_original with all example_change "applied". A new example_change document would automatically be applied to this document. Finding a specific version would consist in retrieving the

Ways to implement data versioning in Cassandra

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Can you share your thoughts how would you implement data versioning in Cassandra. Suppose that I need to version records in an simple address book. (Address book records are stored as Rows in a ColumnFamily). I expect that the history: will be used infrequently will be used all at once to present it in a "time machine" fashion there won't be more versions than few hundred to a single record. history won't expire. I'm considering the following approach: Convert the address book to Super Column Family and store multiple version of address book records in one Row keyed (by time stamp) as super

Database migrations for Entity Framework 4

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问题 I've been playing with Entity Framework 4, using the model driven approach to generate the database script from my entities. This is great but I'm not sure how this works when it comes to versioning the database. I'm guessing if I wanted to use an active record type migration framework I'd have to work the other way around and generate my entities from my database? Is there any way to use the model driven approach and version the database properly? 回答1: This will be coming soon as a NuGet

Database migrations in a complex branching system

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问题 In our current development workflow we have introduced database migrations (using Ruckusing) to keep our developers' db schema's in sync. It works great, is pretty straightforward in use but now we have switched to git as VCS we are facing the next problem in our database versioning system. When checking out a branch that has been in development for some time it might happen that the database schema has diverged alot from the schema in the branch i'm coming from. This causes database

Ways to implement data versioning in Cassandra

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问题 Can you share your thoughts how would you implement data versioning in Cassandra. Suppose that I need to version records in an simple address book. (Address book records are stored as Rows in a ColumnFamily). I expect that the history: will be used infrequently will be used all at once to present it in a "time machine" fashion there won't be more versions than few hundred to a single record. history won't expire. I'm considering the following approach: Convert the address book to Super Column