博客

以下内容参考尚硅谷的https://www.bilibili.com/video/BV1y7411y7am视频

实体类为

EduTeacher

1.service层接口

public interface EduTeacherService extends IService<EduTeacher> {

}

2.service层实现类

@Service
public class EduTeacherServiceImpl extends ServiceImpl<EduTeacherMapper, EduTeacher> implements EduTeacherService {

}

3.controller层调用crud方法

public class EduTeacherController {

    //访问地址： http://localhost:8001/eduservice/teacher/findAll
    //把service注入
    @Autowired
    private EduTeacherService teacherService;

    //1 查询讲师表所有数据
    //rest风格
    @ApiOperation(value = "所有讲师列表")
    @GetMapping("findAll")
    public R findAllTeacher() {
        //调用service的方法实现查询所有的操作
        List<EduTeacher> list = teacherService.list(null);
        return R.ok().data("items",list);
    }

    //2 逻辑删除讲师的方法
    @ApiOperation(value = "逻辑删除讲师")
    @DeleteMapping("{id}")
    public R removeTeacher(@ApiParam(name = "id", value = "讲师ID", required = true)
                                     @PathVariable String id) {
        boolean flag = teacherService.removeById(id);
        if(flag) {
            return R.ok();
        } else {
            return R.error();
        }
    }

    //3 分页查询讲师的方法
    //current 当前页
    //limit 每页记录数
    @GetMapping("pageTeacher/{current}/{limit}")
    public R pageListTeacher(@PathVariable long current,
                             @PathVariable long limit) {
        //创建page对象
        Page<EduTeacher> pageTeacher = new Page<>(current,limit);

        int i = 10/0;

        //调用方法实现分页
        //调用方法时候，底层封装，把分页所有数据封装到pageTeacher对象里面
        teacherService.page(pageTeacher,null);

        long total = pageTeacher.getTotal();//总记录数
        List<EduTeacher> records = pageTeacher.getRecords(); //数据list集合

//        Map map = new HashMap();
//        map.put("total",total);
//        map.put("rows",records);
//        return R.ok().data(map);

        return R.ok().data("total",total).data("rows",records);
    }

    //4 条件查询带分页的方法
    @PostMapping("pageTeacherCondition/{current}/{limit}")
    public R pageTeacherCondition(@PathVariable long current,@PathVariable long limit,
                                  @RequestBody(required = false)  TeacherQuery teacherQuery) {
        //创建page对象
        Page<EduTeacher> pageTeacher = new Page<>(current,limit);

        //构建条件
        QueryWrapper<EduTeacher> wrapper = new QueryWrapper<>();
       // 多条件组合查询
        // mybatis学过 动态sql
        String name = teacherQuery.getName();
        Integer level = teacherQuery.getLevel();
        String begin = teacherQuery.getBegin();
        String end = teacherQuery.getEnd();
        //判断条件值是否为空，如果不为空拼接条件
        if(!StringUtils.isEmpty(name)) {
            //构建条件
            wrapper.like("name",name);
        }
        if(!StringUtils.isEmpty(level)) {
            wrapper.eq("level",level);
        }
        if(!StringUtils.isEmpty(begin)) {
            wrapper.ge("gmt_create",begin);
        }
        if(!StringUtils.isEmpty(end)) {
            wrapper.le("gmt_create",end);
        }

        //调用方法实现条件查询分页
        teacherService.page(pageTeacher,wrapper);

        long total = pageTeacher.getTotal();//总记录数
        List<EduTeacher> records = pageTeacher.getRecords(); //数据list集合
        return R.ok().data("total",total).data("rows",records);
    }

    //添加讲师接口的方法
    @PostMapping("addTeacher")
    public R addTeacher(@RequestBody EduTeacher eduTeacher) {
        boolean save = teacherService.save(eduTeacher);
        if(save) {
            return R.ok();
        } else {
            return R.error();
        }
    }

    //根据讲师id进行查询
    @GetMapping("getTeacher/{id}")
    public R getTeacher(@PathVariable String id) {
        EduTeacher eduTeacher = teacherService.getById(id);
        return R.ok().data("teacher",eduTeacher);
    }

    //讲师修改功能
    @PostMapping("updateTeacher")
    public R updateTeacher(@RequestBody EduTeacher eduTeacher) {
        boolean flag = teacherService.updateById(eduTeacher);
        if(flag) {
            return R.ok();
        } else {
            return R.error();
        }
    }
}