问题
I have a small django website where people have signed up and uploaded pictures and stuff.
I now want to rebuild the website API. This will change the database schema and I want to migrate all the user information from old database to new database.
Whats the best practice of doing this? Links to tutorials will be helpful.
The database backend is postgres-postgis.
TIA
回答1:
There are different approaches to data migration. In my previous employer we rewrote much of the code from scratch and before deploying the new application we had to migrate old data. Two methods are:
Migrate data from the first schema directly from the DB: This is very useful especially if the data you have in legacy DB is huge. If you let the DB copy from one table/database to another it will be extremely fast. You need to have SQL knowledge for this though (google 'insert into from another database').
Write a script or django command to load the data into django models and go from there. This will not be as fast as DB option but it may be easier to code and depending on your scale of changes, your only option. If you are going to do some computation beforehand then a high level language such as python will be helpful.
来源：https://stackoverflow.com/questions/21456575/migrating-data-between-different-schemas