Shulou(Shulou.com)06/01 Report--

In Android, you can get an instance that can operate on the database through both getReadableDatabase and getWritableDatabase (). Then you can add, delete, check and change the database. But there is also a difference between the two

1.getReadableDatabase first opens the database by reading and writing, but when the disk of the database is full, it will fail to open. After failure, the program will try to open the database as read-only. If the required task is completed, the read-only database will be closed and a read-write database object will be returned.

2.getWritableDatabase also opens the database by reading and writing, but when the disk of the database is full, it will fail to open, and then because you are using getWritableDatabase, it also fails to open the read-only database, so the program will make an error

The getWritableDatabase method is called in the 3.getReadableDatabase method.

The source code is:

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