java.sql.SQLException：ORA-01436：⽤户数据中的
CONNECTBY循环
ion_id,parent_id
FROM cnl_region r1
ion_id =1 START ion_id = 1
CONNECT BY ion_id = r1.parent_id
在运⾏上⾯的SQL语句时它会报ORA-01436的错误，报这个错误原因是因为产⽣了循环。后来查我的数据发现，数据region_id为1的parent_id为24684,⽽region_id为24684的parent_id为1，这样就产⽣了循环后来我把数据改过来就运⾏正常了。
不改变数据将下⾯的SQL语句改为让它不产⽣循环
ion_id,parent_id
FROM cnl_region r1
ion_id =1 START ion_id = 1
CONNECT BY NOCYCLE ion_id = r1.parent_id
--start with ... connect by 层次查询的⽤法
--建表语句
create table automobiles(
特斯拉刹车失灵part_id number(5)
constraint pk_auto_part_id primary key,
parent_id number(5)
constraint fk_auto_ppid_ references automobiles(part_id),故宫奔驰
part_cname varchar2(30) not null,
part_ename varchar2(30) not null,
mp_cost number(9,2),
desribe varchar2(20)
);
--插⼊数据
insert into automobiles values( 1,1,'汽车','mobile',84321.99,'Assembly');
insert into automobiles values( 2,1,'车⾝','bodywork',19892.99,'Manufacture');
insert into automobiles values( 3,1,'发送机','engine',42128,'Purchase');
insert into automobiles values( 4,1,'附件','attached',15212,'Assembly');
insert into automobiles values( 5,2,'保险杠','bumper',4812.95,'Purchase');
insert into automobiles values( 6,2,'底盘','chassis',12795.11,'Manufacture');
insert into automobiles values( 7,2,'⾏李箱','Boot',812.11,'Manufacture');
insert into automobiles values( 8,6,'车轮','Wheel',2062.2,'Manufacture');
5挡手动insert into automobiles values( 9,6,'挡泥板','Mudguard',990,'Manufacture');
insert into automobiles values( 10,8,'轮胎','Tyre',300,'Purchase');
insert into automobiles values( 11,3,'发送机盘','Bonnet',3212,'Manufacture');
insert into automobiles values( 12,3,'活塞','Piston',1112.2,'Manufacture');
insert into automobiles values( 13,3,'汽化器','Carburetter',712.29,'Manufacture');
insert into automobiles values( 14,4,'变速器','Gearbox',5712.25,'Manufacture');
insert into automobiles values( 15,4,'仪表板','Dashboard',538.92,'Manufacture');
insert into automobiles values( 16,14,'制动器','Carburetter',712.29,'Manufacture');
insert into automobiles values( 17,14,'变速杆','Gearshift',2001,'Manufacture');
insert into automobiles values( 18,17,'传动轴','Shaft',1101,'Manufacture');
insert into automobiles values( 19,15,'⾥程表','Milometer',350.28,'Purchase');
汽车压缩机/
自动挡车档位介绍select level,part_id,parent_id,part_cname,part_ename,mp_cost,desribe
from automobiles
start with part_id=1
connect by prior part_id=parent_id
order by level;
--缩进显⽰
select level,
lpad(' ',2*level-1)||part_cname||' '||part_ename as partName
from automobiles
start with part_id=1
connect by prior part_id=parent_id
order by level;
ora汽车在执⾏select level语句的时候，报如下错误：ORA-01436: CONNECT BY loop in user data 解决⽅案：
将第⼀条数据中的parent_id改为null，否则loop循环parent_id就不到了！
【转载地址】blog.csdn/weikaifenglove/article/details/4206979
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