feat(service): 增加 Markdown 文件分组名称字段

- 在 MarkdownFileVO 类中添加 groupingName 字段
- 修改 getFilesByGroupingId 和 getRecentFiles 方法返回 MarkdownFileVO 列表- 在前端 HomePage 组件中显示分组名称
- 优化后端 SQL 查询，减少不必要的查询次数

biji-houdaun/src/main/java/com/test/bijihoudaun/controller/MarkdownController.java

@@ -2,6 +2,7 @@ package com.test.bijihoudaun.controller;
 
 import com.test.bijihoudaun.common.response.R;
 import com.test.bijihoudaun.entity.MarkdownFile;
+import com.test.bijihoudaun.entity.MarkdownFileVO;
 import com.test.bijihoudaun.service.MarkdownFileService;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.Parameter;
@@ -71,8 +72,8 @@ public class MarkdownController {
     
     @Operation(summary = "根据分组ID获取Markdown文件")
     @GetMapping("/grouping/{groupingId}")
-    public R<List<MarkdownFile>> getFilesByGroupingId(@PathVariable String groupingId) {
-        List<MarkdownFile> files = markdownFileService.getFilesByGroupingId(groupingId);
+    public R<List<MarkdownFileVO>> getFilesByGroupingId(@PathVariable String groupingId) {
+        List<MarkdownFileVO> files = markdownFileService.getFilesByGroupingId(groupingId);
         return R.success(files);
     }
 
@@ -97,8 +98,8 @@ public class MarkdownController {
 
     @Operation(summary = "获取最近更新的笔记")
     @GetMapping("/recent")
-    public R<List<MarkdownFile>> getRecentFiles() {
-        List<MarkdownFile> files = markdownFileService.getRecentFiles(12);
+    public R<List<MarkdownFileVO>> getRecentFiles() {
+        List<MarkdownFileVO> files = markdownFileService.getRecentFiles(12);
         return R.success(files);
     }
 }

biji-houdaun/src/main/java/com/test/bijihoudaun/entity/MarkdownFileVO.java

@@ -0,0 +1,10 @@
+package com.test.bijihoudaun.entity;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class MarkdownFileVO extends MarkdownFile {
+    private String groupingName;
+}

biji-houdaun/src/main/java/com/test/bijihoudaun/mapper/MarkdownFileMapper.java

@@ -2,10 +2,27 @@ package com.test.bijihoudaun.mapper;
 
 import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import com.test.bijihoudaun.entity.MarkdownFile;
+import com.test.bijihoudaun.entity.MarkdownFileVO;
 import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+import org.apache.ibatis.annotations.Select;
+
+import java.util.List;
 
 @Mapper
 public interface MarkdownFileMapper extends BaseMapper<MarkdownFile> {
-    // 自定义方法：根据用户ID获取文件列表
-    // List<MarkdownFile> findByUserId(Integer userId);
+
+    @Select("SELECT mf.*, g.grouping as groupingName " +
+            "FROM markdown_file mf " +
+            "LEFT JOIN grouping g ON mf.grouping_id = g.id " +
+            "ORDER BY mf.updated_at DESC " +
+            "LIMIT #{limit}")
+    List<MarkdownFileVO> selectRecentWithGrouping(@Param("limit") int limit);
+
+    @Select("SELECT mf.*, g.grouping as groupingName " +
+            "FROM markdown_file mf " +
+            "LEFT JOIN grouping g ON mf.grouping_id = g.id " +
+            "WHERE mf.grouping_id = #{groupingId} " +
+            "ORDER BY mf.updated_at DESC")
+    List<MarkdownFileVO> selectByGroupingIdWithGrouping(@Param("groupingId") String groupingId);
 }

biji-houdaun/src/main/java/com/test/bijihoudaun/service/MarkdownFileService.java

@@ -2,6 +2,7 @@ package com.test.bijihoudaun.service;
 
 import com.baomidou.mybatisplus.extension.service.IService;
 import com.test.bijihoudaun.entity.MarkdownFile;
+import com.test.bijihoudaun.entity.MarkdownFileVO;
 
 import java.util.List;
 
@@ -26,7 +27,7 @@ public interface MarkdownFileService extends IService<MarkdownFile> {
      * @param groupingId 分组ID
      * @return 文件列表
      */
-    List<MarkdownFile> getFilesByGroupingId(String groupingId);
+    List<MarkdownFileVO> getFilesByGroupingId(String groupingId);
     
     /**
      * 删除Markdown文件
@@ -63,5 +64,5 @@ public interface MarkdownFileService extends IService<MarkdownFile> {
      * @param limit 数量
      * @return 文件列表
      */
-    List<MarkdownFile> getRecentFiles(int limit);
+    List<MarkdownFileVO> getRecentFiles(int limit);
 }

biji-houdaun/src/main/java/com/test/bijihoudaun/service/impl/MarkdownFileServiceImpl.java

@@ -1,9 +1,9 @@
 package com.test.bijihoudaun.service.impl;
 
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
-import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import com.test.bijihoudaun.entity.MarkdownFile;
+import com.test.bijihoudaun.entity.MarkdownFileVO;
 import com.test.bijihoudaun.mapper.MarkdownFileMapper;
 import com.test.bijihoudaun.service.MarkdownFileService;
 import com.test.bijihoudaun.util.SnowflakeIdGenerator;
@@ -46,11 +46,8 @@ public class MarkdownFileServiceImpl
 
     
     @Override
-    public List<MarkdownFile> getFilesByGroupingId(String groupingId) {
-        QueryWrapper<MarkdownFile> queryWrapper = new QueryWrapper<>();
-        queryWrapper.eq("grouping_id", groupingId)
-                .orderByDesc("updated_at");
-        return this.list(queryWrapper);
+    public List<MarkdownFileVO> getFilesByGroupingId(String groupingId) {
+        return markdownFileMapper.selectByGroupingIdWithGrouping(groupingId);
     }
     
     @Override
@@ -88,10 +85,7 @@ public class MarkdownFileServiceImpl
     }
 
     @Override
-    public List<MarkdownFile> getRecentFiles(int limit) {
-        Page<MarkdownFile> page = new Page<>(1, limit);
-        QueryWrapper<MarkdownFile> queryWrapper = new QueryWrapper<>();
-        queryWrapper.orderByDesc("updated_at");
-        return this.page(page, queryWrapper).getRecords();
+    public List<MarkdownFileVO> getRecentFiles(int limit) {
+        return markdownFileMapper.selectRecentWithGrouping(limit);
     }
 }