RE: String concat with hierarchical query and sys_connect_by_path(): Avoid ORA-30004?
Date: Mon, 8 Jun 2009 09:22:02 -0400
You have a few options.
1. use the chr function to specify the character so the actual character won't be in the path.
2. use the replace function on the sql_text field to strip out whichever character you are using.
3. filter your query out of the results based on its sqlid.
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Martin Klier
Sent: Monday, June 08, 2009 6:05 AM
Subject: String concat with hierarchical query and sys_connect_by_path(): Avoid ORA-30004?
I've got a question about hierarchical queries, especially sys_connect_by_path():
sys_connect_by_path requires a seperator that does not exist in the returned values, otherwise it spawns an ORA-30004 (or an ORA-30003 if an empty string is specified, which would do for my case).
Is there any way to avoid that? I want to use the query on a statspack sql table (stats$sqltext), so no matter what I choose, sooner or later it will be part of the data. :)
What I did try, is to get the full SQL text from stats$sqltext in one line, without whitespaces. It works very well, but only until my query becomes part of the SQL history. :P
As I'm typing that, I become aware that I can exclude this query from this query, but it would be generally interesting if I somehow can be fully independent from a fixed seperator string (or a seperator in general), since hierarchivcal queries are useful otherwise, too, and it's always a risk to rely on a fixed expression?
My code (the skeleton "stolen" from hali's blog):
with data as
select sql_id, SQL_TEXT, row_number() over (partition by SQL_ID order by PIECE) rn, count(*) over (partition by SQL_ID) cnt from stats$sqltext
-- TRANSLATE replaces '_' with '_', and '$$$' with nothing,
- since no replacement char is specified :)
translate(sys_connect_by_path(SQL_TEXT,'$$$'), '_$$$', '_') SQL_TEXT
where rn = cnt
start with rn = 1
connect by prior SQL_ID = SQL_ID and prior rn = rn-1
order by SQL_ID
Thanks in advance
Usn's IT Blog for Linux, Oracle, Asterisk http://www.usn-it.de
http://www.freelists.org/webpage/oracle-l Received on Mon Jun 08 2009 - 08:22:02 CDT