feat: 新增 上/下章ID查询接口 & 数据库常量类

src/main/java/io/github/xxyopen/novel/controller/front/BookController.java

@@ -66,6 +66,22 @@ public class BookController {
         return bookService.getBookContentAbout(chapterId);
     }
 
+    /**
+     * 获取上一章节ID接口
+     * */
+    @GetMapping("preChapterId/{chapterId}")
+    public RestResp<Long> getPreChapterId(@PathVariable("chapterId") Long chapterId){
+        return bookService.getPreChapterId(chapterId);
+    }
+
+    /**
+     * 获取下一章节ID接口
+     * */
+    @GetMapping("nextChapterId/{chapterId}")
+    public RestResp<Long> nextChapterId(@PathVariable("chapterId") Long chapterId){
+        return bookService.nextChapterId(chapterId);
+    }
+
     /**
      * 小说点击榜查询接口
      * */

src/main/java/io/github/xxyopen/novel/core/constant/DatabaseConsts.java

@@ -0,0 +1,120 @@
+package io.github.xxyopen.novel.core.constant;
+
+import lombok.Getter;
+
+/**
+ * 数据库 常量
+ *
+ * @author xiongxiaoyang
+ * @date 2022/5/12
+ */
+public class DatabaseConsts {
+
+    /**
+     * 小说表
+     */
+    public static class BookTable {
+
+        @Getter
+        public enum ColumnEnum {
+
+            CATEGORY_ID("category_id"),
+            VISIT_COUNT("visit_count"),
+            LAST_CHAPTER_UPDATE_TIME("last_chapter_update_time")
+            ;
+
+            private String name;
+
+            ColumnEnum(String name) {
+                this.name = name;
+            }
+
+        }
+
+    }
+
+    /**
+     * 小说章节表
+     */
+    public static class BookChapterTable {
+
+        @Getter
+        public enum ColumnEnum {
+
+            BOOK_ID("book_id"),
+            CHAPTER_NUM("chapter_num"),
+            LAST_CHAPTER_UPDATE_TIME("last_chapter_update_time")
+            ;
+
+            private String name;
+
+            ColumnEnum(String name) {
+                this.name = name;
+            }
+
+        }
+
+    }
+
+    /**
+     * 小说内容表
+     */
+    public static class BookContentTable {
+
+        @Getter
+        public enum ColumnEnum {
+
+            CHAPTER_ID("chapter_id")
+            ;
+
+            private String name;
+
+            ColumnEnum(String name) {
+                this.name = name;
+            }
+
+        }
+
+    }
+
+    /**
+     * 通用列枚举类
+     * */
+    @Getter
+    public enum CommonColumnEnum{
+
+        ID("id"),
+        SORT("sort"),
+        CREATE_TIME("create_time"),
+        UPDATE_TIME("update_time");
+
+        private String name;
+
+        CommonColumnEnum(String name){
+            this.name = name;
+        }
+
+    }
+
+
+    /**
+     * SQL语句枚举类
+     * */
+    @Getter
+    public enum SqlEnum {
+
+        LIMIT_1("limit 1"),
+        LIMIT_2("limit 2"),
+        LIMIT_30("limit 30"),
+        LIMIT_500("limit 500")
+        ;
+
+        private String sql;
+
+        SqlEnum(String sql) {
+            this.sql = sql;
+        }
+
+    }
+
+}

src/main/java/io/github/xxyopen/novel/dto/resp/BookChapterRespDto.java

@@ -31,6 +31,11 @@ public class BookChapterRespDto implements Serializable {
      */
     private Long bookId;
 
+    /**
+     * 章节号
+     */
+    private Integer chapterNum;
+
     /**
      * 章节名
      */

src/main/java/io/github/xxyopen/novel/manager/BookChapterCacheManager.java

@@ -30,6 +30,7 @@ public class BookChapterCacheManager {
         return BookChapterRespDto.builder()
                 .id(chapterId)
                 .bookId(bookChapter.getBookId())
+                .chapterNum(bookChapter.getChapterNum())
                 .chapterName(bookChapter.getChapterName())
                 .chapterWordCount(bookChapter.getWordCount())
                 .chapterUpdateTime(bookChapter.getUpdateTime())

src/main/java/io/github/xxyopen/novel/manager/BookContentCacheManager.java

@@ -2,6 +2,7 @@ package io.github.xxyopen.novel.manager;
 
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import io.github.xxyopen.novel.core.constant.CacheConsts;
+import io.github.xxyopen.novel.core.constant.DatabaseConsts;
 import io.github.xxyopen.novel.dao.entity.BookContent;
 import io.github.xxyopen.novel.dao.mapper.BookContentMapper;
 import lombok.RequiredArgsConstructor;
@@ -27,7 +28,7 @@ public class BookContentCacheManager {
             , value = CacheConsts.BOOK_CONTENT_CACHE_NAME)
     public String getBookContent(Long chapterId) {
         QueryWrapper<BookContent> contentQueryWrapper = new QueryWrapper<>();
-        contentQueryWrapper.eq("chapter_id",chapterId).last("limit 1");
+        contentQueryWrapper.eq(DatabaseConsts.BookContentTable.ColumnEnum.CHAPTER_ID.getName(), chapterId).last(DatabaseConsts.SqlEnum.LIMIT_1.getSql());
         BookContent bookContent = bookContentMapper.selectOne(contentQueryWrapper);
         return bookContent.getContent();
     }

src/main/java/io/github/xxyopen/novel/manager/BookInfoCacheManager.java

@@ -2,6 +2,7 @@ package io.github.xxyopen.novel.manager;
 
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import io.github.xxyopen.novel.core.constant.CacheConsts;
+import io.github.xxyopen.novel.core.constant.DatabaseConsts;
 import io.github.xxyopen.novel.dao.entity.BookChapter;
 import io.github.xxyopen.novel.dao.entity.BookInfo;
 import io.github.xxyopen.novel.dao.mapper.BookChapterMapper;
@@ -38,9 +39,9 @@ public class BookInfoCacheManager {
         // 查询首章ID
         QueryWrapper<BookChapter> queryWrapper = new QueryWrapper<>();
         queryWrapper
-                .eq("book_id", id)
+                .eq(DatabaseConsts.BookChapterTable.ColumnEnum.BOOK_ID.getName(), id)
-                .orderByAsc("chapter_num")
+                .orderByAsc(DatabaseConsts.BookChapterTable.ColumnEnum.CHAPTER_NUM.getName())
-                .last("limit 1");
+                .last(DatabaseConsts.SqlEnum.LIMIT_1.getSql());
         BookChapter firstBookChapter = bookChapterMapper.selectOne(queryWrapper);
         // 组装响应对象
         return BookInfoRespDto.builder()
@@ -68,9 +69,9 @@ public class BookInfoCacheManager {
             , value = CacheConsts.LAST_UPDATE_BOOK_ID_LIST_CACHE_NAME)
     public List<Long> getLastUpdateIdList(Long categoryId) {
         QueryWrapper<BookInfo> queryWrapper = new QueryWrapper<>();
-        queryWrapper.eq("category_id", categoryId)
+        queryWrapper.eq(DatabaseConsts.BookTable.ColumnEnum.CATEGORY_ID.getName(), categoryId)
-                .orderByDesc("last_chapter_update_time")
+                .orderByDesc(DatabaseConsts.BookTable.ColumnEnum.LAST_CHAPTER_UPDATE_TIME.getName())
-                .last("limit 500");
+                .last(DatabaseConsts.SqlEnum.LIMIT_500.getSql());
         return bookInfoMapper.selectList(queryWrapper).stream().map(BookInfo::getId).toList();
     }
 

src/main/java/io/github/xxyopen/novel/manager/BookRankCacheManager.java

@@ -2,6 +2,7 @@ package io.github.xxyopen.novel.manager;
 
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import io.github.xxyopen.novel.core.constant.CacheConsts;
+import io.github.xxyopen.novel.core.constant.DatabaseConsts;
 import io.github.xxyopen.novel.dao.entity.BookInfo;
 import io.github.xxyopen.novel.dao.mapper.BookInfoMapper;
 import io.github.xxyopen.novel.dto.resp.BookRankRespDto;
@@ -31,7 +32,7 @@ public class BookRankCacheManager {
     public List<BookRankRespDto> listVisitRankBooks() {
         QueryWrapper<BookInfo> bookInfoQueryWrapper = new QueryWrapper<>();
         bookInfoQueryWrapper
-                .orderByDesc("visit_count");
+                .orderByDesc(DatabaseConsts.BookTable.ColumnEnum.VISIT_COUNT.getName());
         return getBookRankRespDtos(bookInfoQueryWrapper);
     }
 
@@ -43,7 +44,7 @@ public class BookRankCacheManager {
     public List<BookRankRespDto> listNewestRankBooks() {
         QueryWrapper<BookInfo> bookInfoQueryWrapper = new QueryWrapper<>();
         bookInfoQueryWrapper
-                .orderByDesc("create_time");
+                .orderByDesc(DatabaseConsts.CommonColumnEnum.CREATE_TIME.getName());
         return getBookRankRespDtos(bookInfoQueryWrapper);
     }
 
@@ -55,12 +56,12 @@ public class BookRankCacheManager {
     public List<BookRankRespDto> listUpdateRankBooks() {
         QueryWrapper<BookInfo> bookInfoQueryWrapper = new QueryWrapper<>();
         bookInfoQueryWrapper
-                .orderByDesc("update_time");
+                .orderByDesc(DatabaseConsts.CommonColumnEnum.UPDATE_TIME.getName());
         return getBookRankRespDtos(bookInfoQueryWrapper);
     }
 
     private List<BookRankRespDto> getBookRankRespDtos(QueryWrapper<BookInfo> bookInfoQueryWrapper) {
-        bookInfoQueryWrapper.last("limit 30");
+        bookInfoQueryWrapper.last(DatabaseConsts.SqlEnum.LIMIT_30.getSql());
         return bookInfoMapper.selectList(bookInfoQueryWrapper).stream().map(v -> {
             BookRankRespDto respDto = new BookRankRespDto();
             respDto.setId(v.getId());

src/main/java/io/github/xxyopen/novel/manager/FriendLinkCacheManager.java

@@ -2,6 +2,7 @@ package io.github.xxyopen.novel.manager;
 
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import io.github.xxyopen.novel.core.constant.CacheConsts;
+import io.github.xxyopen.novel.core.constant.DatabaseConsts;
 import io.github.xxyopen.novel.dao.entity.HomeFriendLink;
 import io.github.xxyopen.novel.dao.mapper.HomeFriendLinkMapper;
 import io.github.xxyopen.novel.dto.resp.HomeFriendLinkRespDto;
@@ -31,7 +32,7 @@ public class FriendLinkCacheManager {
     public List<HomeFriendLinkRespDto> listFriendLinks() {
         // 从友情链接表中查询出友情链接列表
         QueryWrapper<HomeFriendLink> queryWrapper = new QueryWrapper<>();
-        queryWrapper.orderByAsc("sort");
+        queryWrapper.orderByAsc(DatabaseConsts.CommonColumnEnum.SORT.getName());
         return friendLinkMapper.selectList(queryWrapper).stream().map(v -> {
             HomeFriendLinkRespDto respDto = new HomeFriendLinkRespDto();
             respDto.setLinkName(v.getLinkName());

src/main/java/io/github/xxyopen/novel/manager/HomeBookCacheManager.java

@@ -2,6 +2,7 @@ package io.github.xxyopen.novel.manager;
 
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import io.github.xxyopen.novel.core.constant.CacheConsts;
+import io.github.xxyopen.novel.core.constant.DatabaseConsts;
 import io.github.xxyopen.novel.dao.entity.BookInfo;
 import io.github.xxyopen.novel.dao.entity.HomeBook;
 import io.github.xxyopen.novel.dao.mapper.BookInfoMapper;
@@ -40,7 +41,7 @@ public class HomeBookCacheManager {
     public List<HomeBookRespDto> listHomeBooks() {
         // 从首页小说推荐表中查询出需要推荐的小说
         QueryWrapper<HomeBook> queryWrapper = new QueryWrapper<>();
-        queryWrapper.orderByAsc("sort");
+        queryWrapper.orderByAsc(DatabaseConsts.CommonColumnEnum.SORT.getName());
         List<HomeBook> homeBooks = homeBookMapper.selectList(queryWrapper);
 
         // 获取推荐小说ID列表
@@ -51,7 +52,7 @@ public class HomeBookCacheManager {
 
             // 根据小说ID列表查询相关的小说信息列表
             QueryWrapper<BookInfo> bookInfoQueryWrapper = new QueryWrapper<>();
-            bookInfoQueryWrapper.in("id", bookIds);
+            bookInfoQueryWrapper.in(DatabaseConsts.CommonColumnEnum.ID.getName(), bookIds);
             List<BookInfo> bookInfos = bookInfoMapper.selectList(bookInfoQueryWrapper);
 
             // 组装 HomeBookRespDto 列表数据并返回

src/main/java/io/github/xxyopen/novel/manager/NewsCacheManager.java

@@ -2,6 +2,7 @@ package io.github.xxyopen.novel.manager;
 
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import io.github.xxyopen.novel.core.constant.CacheConsts;
+import io.github.xxyopen.novel.core.constant.DatabaseConsts;
 import io.github.xxyopen.novel.dao.entity.NewsInfo;
 import io.github.xxyopen.novel.dao.mapper.NewsInfoMapper;
 import io.github.xxyopen.novel.dto.resp.NewsInfoRespDto;
@@ -31,8 +32,8 @@ public class NewsCacheManager {
     public List<NewsInfoRespDto> listLatestNews() {
         // 从新闻信息表中查询出最新发布的两条新闻
         QueryWrapper<NewsInfo> queryWrapper = new QueryWrapper<>();
-        queryWrapper.orderByDesc("create_time")
+        queryWrapper.orderByDesc(DatabaseConsts.CommonColumnEnum.CREATE_TIME.getName())
-                .last("limit 2");
+                .last(DatabaseConsts.SqlEnum.LIMIT_2.getSql());
         return newsInfoMapper.selectList(queryWrapper).stream().map(v -> {
             NewsInfoRespDto respDto = new NewsInfoRespDto();
             respDto.setId(v.getId());

src/main/java/io/github/xxyopen/novel/service/BookService.java

@@ -56,4 +56,14 @@ public interface BookService {
      * 增加小说点击量
      * */
     RestResp<Void> addVisitCount(Long bookId);
+
+    /**
+     * 获取上一章节ID
+     * */
+    RestResp<Long> getPreChapterId(Long chapterId);
+
+    /**
+     * 获取下一章节ID
+     * */
+    RestResp<Long> nextChapterId(Long chapterId);
 }

src/main/java/io/github/xxyopen/novel/service/impl/BookServiceImpl.java

@@ -2,6 +2,7 @@ package io.github.xxyopen.novel.service.impl;
 
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import io.github.xxyopen.novel.core.common.resp.RestResp;
+import io.github.xxyopen.novel.core.constant.DatabaseConsts;
 import io.github.xxyopen.novel.dao.entity.BookChapter;
 import io.github.xxyopen.novel.dao.mapper.BookChapterMapper;
 import io.github.xxyopen.novel.dao.mapper.BookInfoMapper;
@@ -19,6 +20,7 @@ import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Optional;
 import java.util.Random;
 
 /**
@@ -79,7 +81,7 @@ public class BookServiceImpl implements BookService {
 
         // 查询章节总数
         QueryWrapper<BookChapter> chapterQueryWrapper = new QueryWrapper<>();
-        chapterQueryWrapper.eq("book_id", bookId);
+        chapterQueryWrapper.eq(DatabaseConsts.BookChapterTable.ColumnEnum.BOOK_ID.getName(), bookId);
         Long chapterTotal = bookChapterMapper.selectCount(chapterQueryWrapper);
 
         // 组装数据并返回
@@ -98,14 +100,14 @@ public class BookServiceImpl implements BookService {
         List<Integer> recIdIndexList = new ArrayList<>();
         int count = 0;
         Random rand = SecureRandom.getInstanceStrong();
-        while (count < REC_BOOK_COUNT){
+        while (count < REC_BOOK_COUNT) {
             int recIdIndex = rand.nextInt(lastUpdateIdList.size());
             if (!recIdIndexList.contains(recIdIndex)) {
                 recIdIndexList.add(recIdIndex);
                 bookId = lastUpdateIdList.get(recIdIndex);
                 BookInfoRespDto bookInfo = bookInfoCacheManager.getBookInfo(bookId);
                 respDtoList.add(bookInfo);
-                count ++ ;
+                count++;
             }
         }
         return RestResp.ok(respDtoList);
@@ -117,6 +119,46 @@ public class BookServiceImpl implements BookService {
         return RestResp.ok();
     }
 
+    @Override
+    public RestResp<Long> getPreChapterId(Long chapterId) {
+        // 查询小说ID 和 章节号
+        BookChapterRespDto chapter = bookChapterCacheManager.getChapter(chapterId);
+        Long bookId = chapter.getBookId();
+        Integer chapterNum = chapter.getChapterNum();
+
+        // 查询上一章信息并返回章节ID
+        QueryWrapper<BookChapter> queryWrapper = new QueryWrapper<>();
+        queryWrapper.eq(DatabaseConsts.BookChapterTable.ColumnEnum.BOOK_ID.getName(), bookId)
+                .lt(DatabaseConsts.BookChapterTable.ColumnEnum.CHAPTER_NUM.getName(), chapterNum)
+                .orderByDesc(DatabaseConsts.BookChapterTable.ColumnEnum.CHAPTER_NUM.getName())
+                .last(DatabaseConsts.SqlEnum.LIMIT_1.getSql());
+        return RestResp.ok(
+                Optional.ofNullable(bookChapterMapper.selectOne(queryWrapper))
+                        .map(BookChapter::getId)
+                        .orElse(null)
+        );
+    }
+
+    @Override
+    public RestResp<Long> nextChapterId(Long chapterId) {
+        // 查询小说ID 和 章节号
+        BookChapterRespDto chapter = bookChapterCacheManager.getChapter(chapterId);
+        Long bookId = chapter.getBookId();
+        Integer chapterNum = chapter.getChapterNum();
+
+        // 查询下一章信息并返回章节ID
+        QueryWrapper<BookChapter> queryWrapper = new QueryWrapper<>();
+        queryWrapper.eq(DatabaseConsts.BookChapterTable.ColumnEnum.BOOK_ID.getName(), bookId)
+                .gt(DatabaseConsts.BookChapterTable.ColumnEnum.CHAPTER_NUM.getName(), chapterNum)
+                .orderByAsc(DatabaseConsts.BookChapterTable.ColumnEnum.CHAPTER_NUM.getName())
+                .last(DatabaseConsts.SqlEnum.LIMIT_1.getSql());
+        return RestResp.ok(
+                Optional.ofNullable(bookChapterMapper.selectOne(queryWrapper))
+                        .map(BookChapter::getId)
+                        .orElse(null)
+        );
+    }
+
     @Override
     public RestResp<BookContentAboutRespDto> getBookContentAbout(Long chapterId) {
         // 查询章节信息