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This PR create a new
Driver
interface underStore
, to hold all code relate to underlying database, such as SQL construct. With the newDriver
is whole ready, we can add a new database driver such as MySQL more easily.This PR will realize the request on #1816 and #2269 .
Currently, only
Activity
andSystemSetting
have been moved (in this PR), other struct list below will be moved in next PRs: