20210429解决lombok插件存在，但是运行报不存在异&启动服务其实显示log日志写入地址找不到&Orcale树形结构查找

 1 -- 表结构
 2 create table menu(
 3  id varchar2(64) not null,
 4  parent_id varchar2(64) not null,
 5  name varchar2(100) not null,
 6  depth number(2) not null,
 7  primary key (id)
 8 )
 9 
10 -- 初始化数据
11 -- 顶级菜单
12 insert into menu values (‘100000‘, ‘0‘, ‘顶级菜单1‘, 1);
13 insert into menu values (‘200000‘, ‘0‘, ‘顶级菜单2‘, 1);
14 insert into menu values (‘300000‘, ‘0‘, ‘顶级菜单3‘, 1); 
15 
16 -- 父级菜单
17 -- 顶级菜单1 直接子菜单
18 insert into menu values (‘110000‘, ‘100000‘, ‘菜单11‘, 2);
19 insert into menu values (‘120000‘, ‘100000‘, ‘菜单12‘, 2);
20 insert into menu values (‘130000‘, ‘100000‘, ‘菜单13‘, 2);
21 insert into menu values (‘140000‘, ‘100000‘, ‘菜单14‘, 2); 
22 -- 顶级菜单2 直接子菜单
23 insert into menu values (‘210000‘, ‘200000‘, ‘菜单21‘, 2);
24 insert into menu values (‘220000‘, ‘200000‘, ‘菜单22‘, 2);
25 insert into menu values (‘230000‘, ‘200000‘, ‘菜单23‘, 2); 
26 -- 顶级菜单3 直接子菜单
27 insert into menu values (‘310000‘, ‘300000‘, ‘菜单31‘, 2); 
28 
29 -- 菜单13 直接子菜单
30 insert into menu values (‘131000‘, ‘130000‘, ‘菜单131‘, 3);
31 insert into menu values (‘132000‘, ‘130000‘, ‘菜单132‘, 3);
32 insert into menu values (‘133000‘, ‘130000‘, ‘菜单133‘, 3);
33 
34 -- 菜单132 直接子菜单
35 insert into menu values (‘132100‘, ‘132000‘, ‘菜单1321‘, 4);
36 insert into menu values (‘132200‘, ‘132000‘, ‘菜单1332‘, 4);
37  

--prior放的左右位置决定了检索是自底向上还是自顶向下. 左边是自上而下（找子节点），右边是自下而上（找父节点）
--找父节点
select * from menu start with id=‘130000‘ connect by id = prior parent_id;

--找子节点节点
-- (子节点)id为130000的菜单，以及130000菜单下的所有直接或间接子菜单(prior 在左边， prior、parent_id(等号右边)在右边）
select * from menu start with id=‘130000‘ connect by prior id =  parent_id  ;

-- (父节点)id为1321的菜单，以及1321菜单下的所有直接或间接父菜单(prior、parent_id(等号左边) 都在左边)
select * from menu start with id=‘132100‘ connect by prior parent_id = id;
-- prior 后面跟的是(parent_id) 则是查找父节点,prior后面跟的是(id)则是查找子节点

--根据菜单组分类统计每个菜单包含子菜单的个数
select id, max(name) name, count(1) from menu 
group by id
connect by prior parent_id = id
order by id

-- 查询所有的叶子节点
select t2.* from menu t2 where id not in(select t.parent_id from menu t) order by id;

--生成执行计划
explain plan for select * from menu start with id=‘132100‘ connect by prior parent_id = id;

-- 查询执行计划
select *  from  table( dbms_xplan.display);

Plan hash value: 3563250490
 
----------------------------------------------------------------------------------------------
| Id  | Operation                     | Name         | Rows  | Bytes | Cost (%CPU)| Time     |
----------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT              |              |     1 |   133 |     1   (0)| 00:00:01 |
|*  1 |  CONNECT BY WITH FILTERING    |              |       |       |            |          |
|   2 |   TABLE ACCESS BY INDEX ROWID | MENU         |     1 |   133 |     1   (0)| 00:00:01 |
|*  3 |    INDEX UNIQUE SCAN          | SYS_C0018586 |     1 |       |     1   (0)| 00:00:01 |
|   4 |   NESTED LOOPS                |              |       |       |            |          |
|   5 |    CONNECT BY PUMP            |              |       |       |            |          |
|   6 |    TABLE ACCESS BY INDEX ROWID| MENU         |     1 |   133 |     1   (0)| 00:00:01 |
|*  7 |     INDEX UNIQUE SCAN         | SYS_C0018586 |     1 |       |     1   (0)| 00:00:01 |
----------------------------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   1 - access("ID"=PRIOR "PARENT_ID")
   3 - access("ID"=‘132100‘)
   7 - access("ID"=PRIOR "PARENT_ID")
 
Note
-----
   - dynamic sampling used for this statement