Re: BUG? res.next() == false, but psql finds tuples? - Mailing list pgsql-jdbc

Well, honestly, i'm pretty sure the driver works as well... Problem is, all
other queries *around* this one works.

I guess we'll have to dig deeper into this...

/Palle


--On fredag, april 22, 2005 10.30.37 -0400 Dave Cramer <pg@fastcrypt.com>
wrote:

> Palle,
>
> Well, I'm fairly sure the driver works, so my best guess is that you
> aren't connecting to the db you think you are.
>
> Dave
>
> Palle Girgensohn wrote:
>
>> Well, it uses the server side prepared statements (in the V3
>> protocol?), as you can see in the tcpdump at the end.
>>
>> The working query is
>>
>> select lang from participant where userid = 'mango' and course_id = 38
>>
>> and the dyfunctional is
>>
>> select lang from participant where userid = $1 and course_id = $2
>>
>> with args = mango and 38...
>>
>> /Palle
>>
>>
>> --On fredag, april 22, 2005 10.16.08 -0400 Dave Cramer
>> <pg@fastcrypt.com> wrote:
>>
>>> Certainly looks like a bug, in the java version mango is not quoted
>>> so pg
>>> thinks it is a column.
>>>
>>> Although I just checked the test cases and we do this all the time ???
>>>
>>> Dave
>>>
>>> Palle Girgensohn wrote:
>>>
>>>> Hi!
>>>>
>>>> Here's something really odd. Is it a bug in the jdbc driver? 8.0.311:
>>>>
>>>>
>>>>       String query = "select lang from participant where userid = ?
>>>> and course_id = ?";
>>>>       PreparedStatement ps = con.prepareStatement(query);
>>>>       ps.setString(1, userId);
>>>>       ps.setInt(2, courseId);
>>>>       ResultSet res = ps.executeQuery();
>>>>
>>>>       System.err.println("[1] "+ps);
>>>>
>>>>       boolean hasNext = res.next();
>>>>       System.err.println("hasNext: "+hasNext);
>>>>
>>>>       if (hasNext) {
>>>>           System.err.println("[2]");
>>>>        language = res.getString(1);
>>>>           System.err.println("language: "+language);
>>>>       }
>>>>       System.err.println("[3]");
>>>>
>>>> In the java error log:
>>>>
>>>> ---
>>>> [1] select lang from participant where userid = mango and course_id
>>>> = 38
>>>> hasNext: false
>>>> [3]
>>>> ---
>>>>
>>>>
>>>> but with psql, there's no problem getting a value:
>>>>
>>>> mango=> select lang from participant where userid = 'mango' and
>>>> course_id = 38;
>>>> lang
>>>> ------
>>>> sv
>>>> (1 row)
>>>>
>>>> (Connected to same database as same user.)
>>>>
>>>> What's up? Is there a problem with the (new) prepared statement stuff?
>>>>
>>>> postgresql-8.0.2, postgresql-jdbc-8.0.311, FreeBSD 4.11, java 1.4.2.
>>>>
>>>> /Palle
>>>>
>>>> PS. Here's a tcpdump of the query, FWIW:
>>>>
>>>> 13:37:14.909230 localhost.3277 > localhost.postgresql: P
>>>> 564113356:564113492(136) ack 897123100 win 57344 <nop,nop,timestamp
>>>> 729334714 729334409> (DF)
>>>> 0x0000   4500 00bc 5038 4000 4006 ec01 7f00 0001
>>>> E...P8@.@.......
>>>> 0x0010   7f00 0001 0ccd 1538 219f afcc 3579 031c
>>>> .......8!...5y..
>>>> 0x0020   8018 e000 6474 0000 0101 080a 2b78 c3ba
>>>> ....dt......+x..
>>>> 0x0030   2b78 c289 5000 0000 5100 7365 6c65 6374
>>>> +x..P...Q.select
>>>> 0x0040   206c 616e 6720 6672 6f6d 2070 6172 7469
>>>> .lang.from.parti
>>>> 0x0050   6369 7061 6e74 2077 6865 7265 2075 7365
>>>> cipant.where.use
>>>> 0x0060   7269 6420 3d20 2431 2061 6e64 2063 6f75
>>>> rid.=.$1.and.cou
>>>> 0x0070   7273 655f 6964 203d 2024 3200 0002 0000
>>>> rse_id.=.$2.....
>>>> 0x0080   0413 0000 0017 4200 0000 1f00 0000 0200
>>>> ......B.........
>>>> 0x0090   0000 0000 0200 0000 056d 616e 676f 0000
>>>> .........mango..
>>>> 0x00a0   0002 3338 0000 4400 0000 0650 0045 0000
>>>> ..38..D....P.E..
>>>> 0x00b0   0009 0000 0000 0053 0000 0004                  .......S....
>>>> 13:37:14.916554 localhost.postgresql > localhost.3277: P 1:59(58) ack
>>>> 136 win 57344<nop,nop,timestamp 729334715 729334714> (DF)
>>>> 0x0000   4500 006e 5039 4000 4006 ec4e 7f00 0001
>>>> E..nP9@.@..N....
>>>> 0x0010   7f00 0001 1538 0ccd 3579 031c 219f b054
>>>> .....8..5y..!..T
>>>> 0x0020   8018 e000 4908 0000 0101 080a 2b78 c3bb
>>>> ....I.......+x..
>>>> 0x0030   2b78 c3ba 3100 0000 0432 0000 0004 5400
>>>> +x..1....2....T.
>>>> 0x0040   0000 1d00 016c 616e 6700 0000 4821 0003
>>>> .....lang...H!..
>>>> 0x0050   0000 0019 ffff ffff ffff 0000 4300 0000
>>>> ............C...
>>>> 0x0060   0b53 454c 4543 5400 5a00 0000 0549             .SELECT.Z....I
>>>>
>>>>
>>>>
>>>> And here's one from psql (that works fine, result = 'sv'):
>>>>
>>>> 15:16:40.179908 localhost.1973 > localhost.postgresql: P 82:159(77)
>>>> ack 294 win 57344 <nop,nop,timestamp 729931235 729930768> (DF)
>>>> 0x0000   4500 0081 f57e 4000 4006 46f6 7f00 0001
>>>> E....~@.@.F.....
>>>> 0x0010   7f00 0001 07b5 1538 3c3c 839d 3a40 cc42
>>>> .......8<<..:@.B
>>>> 0x0020   8018 e000 77ae 0000 0101 080a 2b81 dde3
>>>> ....w.......+...
>>>> 0x0030   2b81 dc10 5100 0000 4c73 656c 6563 7420
>>>> +...Q...Lselect.
>>>> 0x0040   6c61 6e67 2066 726f 6d20 7061 7274 6963
>>>> lang.from.partic
>>>> 0x0050   6970 616e 7420 7768 6572 6520 7573 6572
>>>> ipant.where.user
>>>> 0x0060   6964 203d 2027 6d61 6e67 6f27 2061 6e64
>>>> id.=.'mango'.and
>>>> 0x0070   2063 6f75 7273 655f 6964 203d 2033 383b
>>>> .course_id.=.38;
>>>> 0x0080   00                                             .
>>>> 15:16:40.183568 localhost.postgresql > localhost.1973: P 294:355(61)
>>>> ack 159 win 57344 <nop,nop,timestamp 729931236 729931235> (DF)
>>>> 0x0000   4500 0071 f580 4000 4006 4704 7f00 0001
>>>> E..q..@.@.G.....
>>>> 0x0010   7f00 0001 1538 07b5 3a40 cc42 3c3c 83ea
>>>> .....8..:@.B<<..
>>>> 0x0020   8018 e000 28fb 0000 0101 080a 2b81 dde4
>>>> ....(.......+...
>>>> 0x0030   2b81 dde3 5400 0000 1d00 016c 616e 6700
>>>> +...T......lang.
>>>> 0x0040   0000 4821 0003 0000 0019 ffff ffff ffff
>>>> ..H!............
>>>> 0x0050   0000 4400 0000 0c00 0100 0000 0273 7643
>>>> ..D..........svC
>>>> 0x0060   0000 000b 5345 4c45 4354 005a 0000 0005
>>>> ....SELECT.Z....
>>>> 0x0070   49                                             I
>>>>
>>>>
>>>>
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>>>>
>>>
>>> --
>>> Dave Cramer
>>> http://www.postgresintl.com
>>> 519 939 0336
>>> ICQ#14675561
>>>
>>
>>
>>
>>
>>
>>
>
> --
> Dave Cramer
> http://www.postgresintl.com
> 519 939 0336
> ICQ#14675561
>