UserRepository接口有哪些方法：
1.save
2.saveAll
3.findById
4. existsById
5.findAll
6.findAllById
7.count
8.deleteById
9.delete
10.deleteAll
✕
UserRepository接口有哪些方法：
1.save
2.saveAll
3.findById
4. existsById
5.findAll
6.findAllById
7.count
8.deleteById
9.delete
10.deleteAll
