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得到树结构数据也可以用lambda表达式也行#xff0c;也可以直接循环递归也行#xff0c;本文采用的是直接在Mybatis层得到结果#xff0c;各有各的优势。
代码
1、实体类
Data
public class CourseChapterVO implements Serializable {private static final long s…需求
得到树结构数据也可以用lambda表达式也行也可以直接循环递归也行本文采用的是直接在Mybatis层得到结果各有各的优势。
代码
1、实体类
Data
public class CourseChapterVO implements Serializable {private static final long serialVersionUID -67718827554034368L;/*** 主键ID*/private Integer id;/*** 课程ID*/private Integer courseId;/*** 课程章节名称*/private String chapterName;/*** 父ID*/private Integer chapterParent;/*** 层级*/private Integer chapterLevel;JsonInclude(JsonInclude.Include.NON_EMPTY) //当children为空时不返回 private ListCourseChapterVO children;}2、mapper.xml
resultMap typecom.ruoyi.manager.vo.CourseChapterVO idCourseChapterMap2result propertyid columnid jdbcTypeINTEGER/result propertycourseId columncourse_id jdbcTypeINTEGER/result propertychapterName columnchapter_name jdbcTypeVARCHAR/result propertychapterParent columnchapter_parent jdbcTypeINTEGER/result propertychapterLevel columnchapter_level jdbcTypeINTEGER/collection propertychildren ofTypecom.ruoyi.manager.vo.CourseChapterVO columnid selectselectListTree2//resultMapselect idselectListTree1 resultMapCourseChapterMap2select id , course_id, chapter_name, chapter_parent, chapter_levelfrom course_chapter where chapter_parent 0 /selectselect idselectListTree2 resultMapCourseChapterMap2select id , course_id, chapter_name, chapter_parent, chapter_level from course_chapter where chapter_parent #{id}/select3、mapper.java
ListCourseChapterVO selectListTree1(CourseChapter courseChapter);4、serviceImpl.java Overridepublic ListCourseChapterVO queryAll(CourseChapter courseChapter) {return this.courseChapterMapper.selectListTree1(courseChapter);}5、service.java
ListCourseChapterVO queryAll(CourseChapter courseChapter);6、controller.java GetMapping(list)public R queryAll(CourseChapter courseChapter) {return R.data(this.courseChapterService.queryAll(courseChapter));}7、实现效果
{msg: ,code: 0,data: [{id: 1,courseId: 5,chapterName: 第一章节学习,chapterParent: 0,chapterLevel: 1,children: [{id: 2,courseId: 5,chapterName: 第一章节学习子1,chapterParent: 1,chapterLevel: 2},{id: 3,courseId: 5,chapterName: 第一章节学习子2,chapterParent: 1,chapterLevel: 2},{id: 4,courseId: 5,chapterName: 第一章节学习子3,chapterParent: 1,chapterLevel: 2}]},{id: 5,courseId: 5,chapterName: 第二章节学习,chapterParent: 0,chapterLevel: 1,children: [{id: 6,courseId: 5,chapterName: 第二章节学习子,chapterParent: 5,chapterLevel: 2,children: [{id: 9,courseId: 5,chapterName: 第二章节学习子1子1,chapterParent: 6,chapterLevel: 3}]},{id: 7,courseId: 5,chapterName: 第二章节学习子1,chapterParent: 5,chapterLevel: 2},{id: 8,courseId: 5,chapterName: 第二章节学习子2,chapterParent: 5,chapterLevel: 2}]},{id: 10,courseId: 5,chapterName: 第三章节学习gfdgdf,chapterParent: 0,chapterLevel: 1}]
}
