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a.Service层和Dao层结构大致相同
b.ServiceImpl调用Dao层,组合Dao:
private BookMapper bookMapper;public void setBookMapper(BookMapper bookMapper) { this.bookMapper = bookMapper;}public int addBook(Books books) { return bookMapper.addBook();}
c.Controller层调Service层进行注入:
public class BookController { //Controller调service层 @Autowired @Qualifier("BookServiceImpl") private BookService bookService;
d.SSM框架写法:
数据库(jsp和数据库构建)————————>Dao(Mapper和mapper.xml)——————>Service(Service和ServiceImpl)——————>Controller
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