今天完成的事情：（一定要写非常细致的内容，比如说学会了盒子模型，了解了Margin）

完成banner的查询

package org.example.controller;

import org.example.mapper.BannerMapper;
import org.example.model.ApiResponse;
import org.example.model.Banner;
import org.example.service.BannerService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import javax.validation.Valid;
import java.util.List;
import java.util.Map;

@RestController
@RequestMapping("/banner")
public class BannerController {
@Autowired
private BannerService bannerService;
@Autowired
    private BannerMapper bannerMapper;
@GetMapping("/{state}")
public ApiResponse <Banner> getBannerState(@PathVariable String state) {
    Banner banner = bannerService.getBannerByState(state);
    if (banner == null) {
        return ApiResponse.error(404, "Banner not found");
    }
    return ApiResponse.success(banner);
}
@GetMapping("/{author}")
public ApiResponse <Banner> getBannerAuthor(@PathVariable String author) {
    Banner banner = bannerService.getBannerByAuthor(author);
    if (banner == null) {
        return ApiResponse.error(404, "Banner not found");
    }
    return ApiResponse.success(banner);
}
@GetMapping("/all")
public ApiResponse <List<Banner>> getAllBanners() {
    List<Banner> banners = bannerService.getAllBanners();
    return ApiResponse.success(banners);
    }
    @PutMapping("/{id}")
    public ApiResponse<Boolean> updateBanner(@PathVariable Long id, @RequestBody@Valid Banner banner) {
     return ApiResponse.success(bannerService.updateBanner(banner));
    }
    @PostMapping("/")
    public ApiResponse <Long> createBanner(@RequestBody Banner banner) {
        return ApiResponse.success(bannerService.insertBanner(banner));
    }
    @DeleteMapping("/{id}")
        public ApiResponse <Boolean> deleteBanner(@PathVariable Long id) {
    return ApiResponse.success(bannerService.deleteById(id));
    }
}

package org.example.service.Impl;

import org.example.mapper.BannerMapper;
import org.example.model.Banner;
import org.example.service.BannerService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;

@Service
public class BannerServiceImpl implements BannerService {
    @Autowired
    private BannerMapper bannerMapper;
    @Override
    public long insertBanner(Banner banner){
        long currentTime = System.currentTimeMillis();
        banner.setCreateAt(currentTime);
        banner.setUpdateAt(currentTime);
        bannerMapper.insert(banner);
        return banner.getId();
    }
    @Override
    public boolean updateBanner(Banner banner) {
        long currentTime = System.currentTimeMillis();
        return bannerMapper.update(banner) > 0;
    }
    @Override
    public boolean deleteById(Long id) {
        return bannerMapper.deleteById(id) > 0;
    }
    @Override
    public Banner getBannerByState(String state) {
        return bannerMapper.selectByState(state);
    }
    @Override
    public Banner getBannerByAuthor(String author) {
        return bannerMapper.selectByAuthor(author);
    }
    @Override
    public List<Banner> getAllBanners() {
        return bannerMapper.selectAll();
    }
}

明天计划的事情：（一定要写非常细致的内容）
遇到的问题：（遇到什么困难，怎么解决的）
收获：（通过今天的学习，学到了什么知识）