Aw: Re: Problems with comments in SQL code

4 Nov 2014


      I checked that with DBVisualizer and other database systems (like PostgreSQL, MySQL). The error appears with MonetDB only. So I guess, it's a matter of the MonetDB JDBC driver.

I am aware of the "/* */" comment style, but "--" it is very handy for quickly commenting single lines, and it's ANSI compliant, too.
...
Gesendet: Freitag, 17. Oktober 2014 um 11:47 Uhr
Von: "Sjoerd Mullender" 
An: developers-list@monetdb.org
Betreff: Re: Problems with comments in SQL code
On 17/10/14 11:32, Robert Koch wrote:
...
SELECT
    *
FROM
    sys.storage
WHERE 1=1
    AND "schema" = 'sapsr3'
    AND "table" = 'dfkkop'
;
works in mclient and DBVisualizer (via JDBC)
SELECT
    *
FROM
    sys.storage
WHERE 1=1
    AND "schema" = 'sapsr3'
    --AND "table" = 'dfkkop'
;
works in mclient, but does not work in DBVisualizer. error message:
11:23:37  [SELECT - 0 row(s), 0.000 secs]  1) [Error Code: 0, SQL State: 42000]  syntax error, unexpected $end, expecting SCOLON in: "select. 2) [Error Code: 0, SQL State: 22000]      *. 3) [Error Code: 0, SQL State: 22000]  from. 4) [Error Code: 0, SQL State: 22000]      sys.storage. 5) [Error Code: 0, SQL State: 22000]  where 1=1. 6) [Error Code: 0, SQL State: 22000]      and "schema" = 'sapsr3'. 7) [Error Code: 0, SQL State: 22000]      --AND "table" = 'dfkkop';"
... 1 statement(s) executed, 0 row(s) affected, exec/fetch time: 0.000/0.000 sec  [0 successful, 0 warnings, 1 errors]
Looks like DBVisualizer turns the embedded line endings into spaces, so
your comment doesn't end.
What you can do is use C-style comments: /* ... */.  These are also
recognized by MonetDB.
...
I also noticed this problem (handling comments) in other statements, especially when comments appear before the semicolon. I am not sure, if this is a problem in JDBC driver or DBVisualizer. To see, what is received by monetdb server, I would like to see log files of SQL queries. I found a directory named "/sql_logs/sql", but it consits of 2 files nearly empty. Where can I enable logging?
Stay away from those files!  They are an integral part of the database.
 That directory is for the write-ahead log.
There is a possibility to enable debugging.  I think you need to add a
debug=true and logfile=wherever property to the connection URI.
-- 
Sjoerd Mullender
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