SSMP整合案例第三步业务层service开发及基于Mybatis的接口功能拓展

业务层开发

对于业务层的制作有个误区

Service层接口定义与数据层接口定义具有较大差别不要混用

业务层接口关注的是业务名称

数据层接口关注的是数据层名称

操作是不难

但是有些东西还是要掌握的

业务层接口如果是业务方法就按照业务名称来代替

如果是数据操作直接用操作名称来代替

写接口

package com.bigdata1421.ssmp.service;import com.baomidou.mybatisplus.core.metadata.IPage;
import com.bigdata1421.ssmp.domain.User;import java.util.List;public interface UserService {Boolean save(User user);Boolean update(User user);Boolean delete(Integer id);User getById(Integer id);List<User> geTAll();IPage<User> getPage(int currentPage , int pageSize);}

接口写完了我们去写实现类

实现方法

@service 注解定义成数据层对于的bean

@Autowired 注入

package com.bigdata1421.ssmp.service.impl;import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.bigdata1421.ssmp.dao.UserDao;
import com.bigdata1421.ssmp.domain.User;
import com.bigdata1421.ssmp.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.util.List;// 定义成业务层对应的bean
@Service
public class UserServiceImpl implements UserService {//注入@Autowiredprivate UserDao userDao;@Overridepublic Boolean save(User user) {return userDao.insert(user)>0;}@Overridepublic Boolean update(User user) {return userDao.updateById(user)>0;}@Overridepublic Boolean delete(Integer id) {return userDao.deleteById(id)>0;}@Overridepublic User getById(Integer id) {return userDao.selectById(id);}@Overridepublic List<User> geTAll() {return userDao.selectList(null);}@Overridepublic IPage<User> getPage(int currentPage, int pageSize) {IPage page = new Page(currentPage,pageSize);userDao.selectPage(page,null);return page;}
}

测试

业务层的逻辑必须书写测试方法

package com.bigdata1421.ssmp.service;import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.bigdata1421.ssmp.dao.UserDao;
import com.bigdata1421.ssmp.domain.User;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;import javax.xml.ws.soap.Addressing;@SpringBootTest
public class UserserviceTestCase {@Autowiredprivate UserService userService;@Testvoid testGetById(){System.out.println(userService.getById(1));}@Testvoid testSave(){User user=new User();user.setId(11);user.setName("王连扬");user.setAge(21);user.setGender(1);userService.save(user);}@Testvoid testUpdate(){User user=new User();user.setId(11);user.setName("王连扬");user.setAge(21);user.setGender(1);userService.update(user);}@Testvoid testDelete(){userService.delete(11);}@Testvoid testGetAll(){userService.geTAll();}@Testvoid testGetPage(){IPage<User>page=userService.getPage(2,5);System.out.println(page.getCurrent());System.out.println(page.getSize());System.out.println(page.getTotal());System.out.println(page.getPages());System.out.println(page.getRecords());}}

测试已经通过

小结

定义方法

实现类

测试类

业务层快速开发

业务层的开发快死死了

我们一个一个的写

其实不用

我们用Mybatis提供的业务层提供的公共接口即可实现功能的拓展

重写业务层接口

package com.bigdata1421.ssmp.service;import com.baomidou.mybatisplus.extension.service.IService;
import com.bigdata1421.ssmp.domain.User;public interface IUserService extends IService<User> {
}

直接写实现类

在通用类的基础上做功能重载和功能追加

impl 实现接口

package com.bigdata1421.ssmp.service.impl;import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.bigdata1421.ssmp.dao.UserDao;
import com.bigdata1421.ssmp.service.IUserService;
import com.bigdata1421.ssmp.domain.User;
import org.springframework.stereotype.Service;@Service//定义成业务层的bean
public class UserServiceImpl extends ServiceImpl<UserDao,User> implements IUserService {
}

开发测试

package com.bigdata1421.ssmp.service;import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.bigdata1421.ssmp.dao.UserDao;
import com.bigdata1421.ssmp.domain.User;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;import javax.xml.ws.soap.Addressing;@SpringBootTest
public class UserServiceTest {@Autowiredprivate IUserService iUserService ;@Testvoid testGetById(){System.out.println(iUserService.getById(1));}@Testvoid testSave(){User user=new User();user.setId(11);user.setName("王连扬");user.setAge(21);user.setGender(1);iUserService.save(user);}@Testvoid testUpdate(){User user=new User();user.setId(11);user.setName("王连扬");user.setAge(21);user.setGender(1);iUserService.updateById(user);}@Testvoid testDelete(){iUserService.removeById(1);}@Testvoid testGetAll(){iUserService.list();}@Testvoid testGetPage(){IPage<User>page=new Page<User>(2,5);iUserService.page(page);System.out.println(page.getCurrent());System.out.println(page.getSize());System.out.println(page.getTotal());System.out.println(page.getPages());System.out.println(page.getRecords());}}

测试通过