When a developer has multiple versions of the object-relational mapping database, and the developer calls the BookStoreUpgrade class to upgrade the database version, the version number of the BookStoreUpgrade class is configured as "2", and the actual version number of the current BookStore.db is "1".
When a developer starts a music player on a remote device, he or she may not fill in the Deviceld of the remote device.
In HarmonyOS's "1+8+N" strategy, smart microwave oven devices belong to "N" devices.
HarmonyOS's distributed soft bus enables distributed management of application data and user data.
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