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SpringBoot、mybatis返回树结构的数据实现

公司有个业务需要查出所有的用户权限分类,并将最后一层类别所包含的权限查出来。

数据库说明,有一个parent_id 字段是最好的:、

parent_id的值就是上级的id,一般的话,最顶级的parent_id是设置为0 。

先看看表结构:

 下面不说废话,直接上代码:

定义的vo类:

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@ApiModelProperty ( "id" )

private Long id;

 

@ApiModelProperty ( "父ID" )

private Long parentId;

 

 

@ApiModelProperty ( "名称" )

private String name;

 

@ApiModelProperty ( "子节点" )

private List<UserVo> children;

 获取列表

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List<UserVo>  userList userService.findUsersAndChildrenList(User);

List<UserVo> users = new ArrayList<>();

     for (UserVo r : userList) {

         UserVo user = new UserVo();

         user.setId(r.getId());

         user.setParentId(r.getParentId());

         user.setName(r.getName());

         List<UserVo>  children = this .getChildrenList(r.getId(), status);

         user.setChildren(children);

         users.add(user);

  }

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public List<UserVo> getChildrenList(Long cid){

     List<UserVo> users=  userService.findUserChildrenByParentId(cid);

     List<UserVo> userList= new ArrayList<>();

     if (users){

         for (UserVo u : users) {

             UserVo user = new UserVo();

             user.setId(u.getId());

             user.setName(u.getName());

             user.setParentId(u.getParentId());

             List<UserVo >  children = this .getChildrenList(u.getId());

             user.setChildren(children);

             userList.add(user);

         }

     }

     return   userList;

}

 mybatis查询:

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< select id = "findUserChildrenList" resultMap = "BaseResultMap" >

         SELECT *

         FROM user

         WHERE parent_id=#{id}

</ select >

最终的数据结构:

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{

     "message" : '获取成功' ,

     "data" :{

         "num" :1,

         "pageSize" :20,

         "total" :1,

         "list" :[

             {

                 "id" :6,

                 "name" : "测试" ,

                 "parent_id" :1,

                 "children" :[

                     {

                         "id" :9,

                         "name" : "测试1" ,

                         "parent_id" :6,

                         "children" :[

                             {

                                 "id" :20,

                                 "name" : "测试2" ,

                                 "parent_id" :9,

                                 "children" :[

                                     {

                                         "id" :21,

                                         "name" : "测试3" ,

                                         "parent_id" :20,

                                     },

                                     {

                                         "id" :22,

                                         "name" : "测试4" ,

                                         "parent_id" :20,

                                     },

                                     {

                                          "id" :23,

                                         "name" : "测试5" ,

                                         "parent_id" :20,

                                     }

                                 ],

                             }

                         ],

                     },

                 ],

             }

         ]

     },

     "code" :200

}

 如果要查某个节点的所有父节点:

 mybatis查询改为 :

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< select id = "findUserParentListById" resultMap = "BaseResultMap" >

         SELECT *

         FROM user

         WHERE id=#{id}

</ select >

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public List<UserVo> getParentList(Long cid){

     List<UserVo> users=  userService.findUserParentListById(cid);

     List<UserVo> userList= new ArrayList<>();

     if (users){

         for (UserVo u : users) {

             UserVo user = new UserVo();

             user.setId(u.getId());

             user.setName(u.getName());

             user.setParentId(u.getParentId());

             List<UserVo >  children = this .getParentList(u.getParentId());

             user.setChildren(children);

             userList.add(user);

         }

     }

     return   userList;

}

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原文链接:https://blog.csdn.net/lchmyhua88/article/details/124228470

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