content
1. Query age information (pagination with conditions)
1.1. Add methods to service and its implementation class
1.2. Add a method to the controller
2. Add and modify grade information
2.1. Add a method to the controller
3. Delete and batch delete grade information
3.1. Add a method to the controller
1. Query age information (pagination with conditions)
1.1. Add methods to service and its implementation class
GradeService
public interface GradeService extends IService<Grade> {
/**
* 获取年级信息(分页带条件)
* @param page
* @param gradeName 年级关键字搜索，用于模糊查询
* @return
*/
IPage<Grade> getGradesByOpr(Page<Grade> page, String gradeName);
}GradeServiceImpl
@Service
@Transactional
public class GradeServiceImpl extends ServiceImpl<GradeMapper, Grade> implements GradeService {
/**
* 获取年级信息(分页带条件)
* @param page
* @param gradeName 年级关键字搜索，用于模糊查询
* @return
*/
@Override
public IPage<Grade> getGradesByOpr(Page<Grade> page, String gradeName) {
QueryWrapper<Grade> queryWrapper = new QueryWrapper<>();
if(!StringUtils.isEmpty(gradeName)){
// gradeName不为空，添加模糊查询条件
queryWrapper.like("name", gradeName);
}
queryWrapper.orderByDesc("id"); // 根据id倒序排列
Page<Grade> gradePage = baseMapper.selectPage(page, queryWrapper);
return gradePage;
}
}1.2. Add a method to the controller
GradeController
@RestController
@RequestMapping("/sms/gradeController")
public class GradeController {
@Autowired
private GradeService gradeService;
/**
* 获取年级信息(分页带条件)
* 请求路径：localhost:8080/sms/gradeController/getGrades/{pageNo}/{pageSize}?gradeName=xxx
* 其中，请求路径的gradeName为密文
*
* @param pageNo 分页查询的页码数
* @param pageSize 分页查询每页的数据数
* @param gradeName 年级名字，用于搜索时的模糊查询
* @return
*/
@ApiOperation("获取年级信息(分页带条件)")
@GetMapping("/getGrades/{pageNo}/{pageSize}")
public Result getGrades(
@ApiParam("分页查询的页码数") @PathVariable("pageNo") Integer pageNo,
@ApiParam("分页查询每页的数据数") @PathVariable("pageSize") Integer pageSize,
// @RequestParam可以省略，若不省略，必须加上required = false，否则会出错
@ApiParam("年级名字，用于搜索时的模糊查询") @RequestParam(value = "gradeName", required = false) String gradeName
) {
// 分页，带条件查询
Page<Grade> page = new Page<>(pageNo, pageSize);
// 获取年级信息
IPage<Grade> pageRs = gradeService.getGradesByOpr(page, gradeName);
// 封装Result对象并返回
return Result.ok(pageRs);
}
}2. Add and modify grade information
2.1. Add a method to the controller
Since the IService provided by mybatisplus has the saveOrUpdate method, there is no need to write the method of the service layer
GradeController
/**
* 添加或修改年级信息，参数grade有id属性为修改，没有是添加
* @param grade 年级信息的JSON对象
* @return
*/
@ApiOperation("添加或修改年级信息，参数grade有id属性为修改，没有是添加")
@PostMapping("/saveOrUpdateGrade")
public Result saveOrUpdate(
// 从请求体中接收参数
@ApiParam("年级信息的JSON对象") @RequestBody Grade grade
) {
gradeService.saveOrUpdate(grade);
return Result.ok();
}3. Delete and batch delete grade information
3.1. Add a method to the controller
Since the IService provided by mybatisplus has the removeByIds method, there is no need to write the method of the service layer
GradeController
/**
* 删除或批量删除年级信息
* @param ids 要删除的年级信息的id的JSON集合
* @return
*/
@ApiOperation("(批量)删除年级信息")
@DeleteMapping("/deleteGrade")
public Result deleteGrade(
// 从请求体中接收参数json数组
@ApiParam("要删除的年级信息的id的JSON集合") @RequestBody List<Integer> ids
) {
gradeService.removeByIds(ids);
return Result.ok();
}