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SpringBoot、mybatis返回树结构的数据实现

2022-11-15 11:52华大哥 Java教程

本文主要介绍了SpringBoot、mybatis返回树结构的数据实现,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编来一起学习学习吧

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。

SpringBoot、mybatis返回树结构的数据实现

数据库说明,有一个parent_id 字段是最好的:、

SpringBoot、mybatis返回树结构的数据实现

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:

SpringBoot、mybatis返回树结构的数据实现

 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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