[GENERAL] ERROR: query returned no rows - Mailing list pgsql-general

From Alexander Farber
Subject [GENERAL] ERROR: query returned no rows
Date
Msg-id CAADeyWi2CRO8t3mo7nKdf=mmRfbPqjrL-0_-QoTD4VqE6u5Zjw@mail.gmail.com
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Re: [GENERAL] ERROR: query returned no rows
Re: [GENERAL] ERROR: query returned no rows
List pgsql-general
Good evening,

with PostgreSQL 9.5 I have extended a larger custom function, which has worked well before and my problem is that the error message returned by the database is rather cryptic:

words=> select * from words_skip_game(1, 1);
ERROR:  query returned no rows
CONTEXT:  PL/pgSQL function words_skip_game(integer,integer) line 85 at SQL statement

When I look at my source code ( https://gist.github.com/afarber/cac9a83b7a37307ace8d787be9b8ff4c ) at the line 85, then I am not sure if the line number reported by the error message is correct, because it points into middle of an UPDATE statement:

                UPDATE words_games SET
                        finished = _finished,
                        played2  = CURRENT_TIMESTAMP
                WHERE
                        gid      = in_gid AND
                        player2  = in_uid AND
                        -- game is not over yet
                        finished IS NULL  AND
                        -- and it is second player's turn
                        (played2 IS NULL OR played2 < played1)
                RETURNING
                        player1,
                        score2, 
                        score1
                INTO
                        _opponent,
                        _score1,               -- the line 85
                        _score2;

And here is my words_games table:

words=> \d words_games
                                   Table "public.words_games"
  Column  |           Type           |                         Modifiers                         
----------+--------------------------+-----------------------------------------------------------
 gid      | integer                  | not null default nextval('words_games_gid_seq'::regclass)
 created  | timestamp with time zone | not null
 finished | timestamp with time zone | 
 player1  | integer                  | not null
 player2  | integer                  | 
 played1  | timestamp with time zone | 
 played2  | timestamp with time zone | 
 score1   | integer                  | not null
 score2   | integer                  | not null
 hand1    | character(1)[]           | not null
 hand2    | character(1)[]           | not null
 pile     | character(1)[]           | not null
 letters  | character(1)[]           | not null
 values   | integer[]                | not null
 bid      | integer                  | not null
Indexes:
    "words_games_pkey" PRIMARY KEY, btree (gid)
Check constraints:
    "words_games_check" CHECK (player1 <> player2)
    "words_games_score1_check" CHECK (score1 >= 0)
    "words_games_score2_check" CHECK (score2 >= 0)
Foreign-key constraints:
    "words_games_bid_fkey" FOREIGN KEY (bid) REFERENCES words_boards(bid) ON DELETE CASCADE
    "words_games_player1_fkey" FOREIGN KEY (player1) REFERENCES words_users(uid) ON DELETE CASCADE
    "words_games_player2_fkey" FOREIGN KEY (player2) REFERENCES words_users(uid) ON DELETE CASCADE
Referenced by:
    TABLE "words_chat" CONSTRAINT "words_chat_gid_fkey" FOREIGN KEY (gid) REFERENCES words_games(gid) ON DELETE CASCADE
    TABLE "words_moves" CONSTRAINT "words_moves_gid_fkey" FOREIGN KEY (gid) REFERENCES words_games(gid) ON DELETE CASCADE
    TABLE "words_notes" CONSTRAINT "words_notes_gid_fkey" FOREIGN KEY (gid) REFERENCES words_games(gid) ON DELETE CASCADE
    TABLE "words_scores" CONSTRAINT "words_scores_gid_fkey" FOREIGN KEY (gid) REFERENCES words_games(gid) ON DELETE CASCADE

And the record for the gid=1 (apologies if I copy-paste too much data here):

words=> select * from words_games where gid=1;
 gid |            created            | finished | player1 | player2 | played1 | played2 | score1 | score2 |      hand1      |      hand2      |                                                                                                                   pile                                                                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               letters                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                values                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | bid 
-----+-------------------------------+----------+---------+---------+---------+---------+--------+--------+-----------------+-----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----
   1 | 2017-06-26 19:42:22.356327+02 |          |       1 |         |         |         |      0 |      0 | {У,К,Ж,О,И,Д,Т} | {Е,Р,П,З,Х,О,*} | {Т,Р,В,Л,Ц,А,С,Л,И,В,Б,Д,Ш,Ы,Е,О,Н,В,И,В,С,А,Т,Ж,С,К,С,Л,Г,*,А,Щ,Н,И,Е,Б,К,Ф,Д,Т,О,К,Р,П,Б,М,Е,Г,Ю,З,Д,Ъ,С,А,К,Ч,И,П,М,Й,У,Е,Е,М,О,О,Н,Н,Ь,У,Й,Э,Л,О,С,Х,И,М,Я,Д,О,Е,А,П,А,Е,Ч,Я,Й,Г,А,Н,Я,О,И,Р,О,П,Е,Р,Н,К,Ь,В,Р,М,А,А,А,Н,Т,П,Ы,Н,И,Й} | {{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL}} | {{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULwords=> 

Any hints please? 

Searching Google for "query returned no rows" postgresql has not worked for me yet.

Looking at the server logs has not helped either (same cryptic error message with no additional details).

Best regards
Alex

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