9

ORA-30004 when using SYS_CONNECT_BY_PATH function, cannot have seperator as part of the column

Action: Use another seperator which does not occur in any column value, then retry.

Error on:

select ...
Sys_Connect_By_Path(myVariable || ':' || mySecondVariable, ' --> ') "myNewVar",
...

Works:

select ...
Sys_Connect_By_Path(myVariable || ':' || mySecondVariable, ' -> ') "myNewVar",
...

In the data we found some text like this

  • SomeText B--More Text
  • SomeText A--More Text

Since there is no '-->' or for that mater no '-->' in the data why does the first one error? The second one has a space in front and on the end.

4

1 回答 1

11

那是因为--它是分隔符的一部分，-->但不是->分隔符的一部分。

即使你的数据值有-->这个查询也不应该出错。如下所示。

SQL> select Sys_Connect_By_Path('SomeText B-->More Text' || ':' || 'SomeText A-->More Text', ' --> ') "myNewVar"
from dual
connect by  rownum<=3;

myNewVar                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
----------------------------------------------------
--> SomeText B-->More Text:SomeText A-->More Text                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
--> SomeText B-->More Text:SomeText A-->More Text --> SomeText B-->More Text:SomeText A-->More Text                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
--> SomeText B-->More Text:SomeText A-->More Text --> SomeText B-->More Text:SomeText A-->More Text --> SomeText B-->More Text:SomeText A-->More Text

上面的分隔符是-->，注意空格。此空格被视为分隔符的一部分，即chr(1)||chr(45)||chr(45)||chr(62)||chr(1). 这整个字符串不是您的数据或列值的一部分。

如下会出错的地方

SQL> select Sys_Connect_By_Path('SomeText B-->More Text' || ':' || 'SomeText A-->More Text', '-->') "myNewVar"
from dual
connect by  rownum<=3;

ORA-30004: when using SYS_CONNECT_BY_PATH function, cannot have seperator as part of column value
30004. 00000 -  "when using SYS_CONNECT_BY_PATH function, cannot have seperator as part of column value"
*Cause:    
*Action:   Use another seperator which does not occur in any column value,
           then retry.

上面的分隔符是-->，请注意没有空格，即chr(45)||chr(45)||chr(62)。这整个字符串确实是您的数据或列值的一部分，因此是错误的。

这是一个解决方案（性能未经测试）

select regexp_replace(Sys_Connect_By_Path('SomeText B-->More Text' || ':' || 'SomeText A-->More Text', ' -> '),' -> ','-->') "myNewVar"
from dual
connect by  rownum<=3;

myNewVar                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
--------------------------------------
-->SomeText B-->More Text:SomeText A-->More Text                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
-->SomeText B-->More Text:SomeText A-->More Text-->SomeText B-->More Text:SomeText A-->More Text                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
-->SomeText B-->More Text:SomeText A-->More Text-->SomeText B-->More Text:SomeText A-->More Text-->SomeText B-->More Text:SomeText A-->More Text

解释 -这里（在上面的查询中）->（带空格）不是这里数据的一部分，即-->。一旦列通过路径连接，regexp_replace将替换所有出现的->with-->所以这样你仍然可以使用-->分隔符而不是->.

于 2012-08-08T19:10:42.777 回答