コオロギを入手したcodeigniterフォーラムからクロスポストされました。
2つの左結合といくつかの内部結合を使用するクエリがあります。Firefoxでは接続リセットエラーが返され、apacheログにはエラーメッセージが返されません。
'left'引数を削除しても、同じエラーは発生しません。DBで直接$ this-> db-> last_query（）からSQLを実行し、LEFT結合を追加すると、正しく戻ります（phpMyAdminのいずれかで）。またはコマンドライン）。
「内側の」引数を渡す必要はありません。実験のためにそこに入れます。
$this->db->select('votes.uid AS voterUID, comments.uid AS voteeUID, voteTypes.id AS voteTypeID, userratingVoter.level AS voterLevel, userratingVotee.level AS voteeLevel');
$this->db->from('votes');
# Join the comments table on comments.id = votes.cid
$this->db->join('comments', 'comments.id = votes.cid', 'inner');
# Join the userauth table for admin WHERE clause below
$this->db->join('userauth', 'userauth.uid = votes.uid', 'inner');
# Join the votesTypes table for the WHERE IN clause below
$this->db->join('voteTypes', 'voteTypes.id = votes.voteid', 'inner');
# Join the userrating table twice once for the Voter once for the Votee
$this->db->join('userrating AS userratingVotee', 'userratingVotee.uid = comments.uid', 'left');
$this->db->join('userrating AS userratingVoter', 'userratingVoter.uid = votes.uid', 'left');
# Where in valid Vote Types
# Valid Vote Types: helpful, interesting, correct, incorrect
# 5 4 2 7
$validVoteTypes = array(5,4,2,7);
$this->db->where_in('votes.voteid', $validVoteTypes);
# Where vote is active.
$this->db->where('votes.active',1);
# Where timestamp is greater than the last run timestamp.
$this->db->where('votes.timestamp >',$lastrun);
# Only standard user votes count, may have to update this if we get other authids
$this->db->where('userauth.authid',2);
$ this-> db-> last_query（）...からSQLを分割すると、phpMyAdminおよびコマンドラインから機能します。
SELECT `votes`.`uid` AS voterUID, `comments`.`uid` AS voteeUID, `voteTypes`.`id` AS voteTypeID, `userratingVoter`.`level` AS voterLevel, `userratingVotee`.`level` AS voteeLevel
FROM (`votes`)
INNER JOIN `comments` ON `comments`.`id` = `votes`.`cid`
INNER JOIN `userauth` ON `userauth`.`uid` = `votes`.`uid`
INNER JOIN `voteTypes` ON `voteTypes`.`id` = `votes`.`voteid`
LEFT JOIN `userrating` AS userratingVotee ON `userratingVotee`.`uid` = `comments`.`uid`
LEFT JOIN `userrating` AS userratingVoter ON `userratingVoter`.`uid` = `votes`.`uid`
WHERE `votes`.`voteid` IN (5, 4, 2, 7)
AND `votes`.`active` = 1
AND `votes`.`timestamp` > '2012-03-01 00:00:00'
AND `userauth`.`authid` = 2
さらに、アクティブレコード構文の代わりに標準クエリを使用すると、同じ結果が生成されます。
$sql = "SELECT `votes`.`uid` AS voterUID, `comments`.`uid` AS voteeUID, `voteTypes`.`id` AS voteTypeID, `userratingVoter`.`level` AS voterLevel, `userratingVotee`.`level` AS voteeLevel FROM (`votes`) INNER JOIN `comments` ON `comments`.`id` = `votes`.`cid` INNER JOIN `userauth` ON `userauth`.`uid` = `votes`.`uid` INNER JOIN `voteTypes` ON `voteTypes`.`id` = `votes`.`voteid` LEFT JOIN `userrating` AS userratingVotee ON `userratingVotee`.`uid` = `comments`.`uid` LEFT JOIN `userrating` AS userratingVoter ON `userratingVoter`.`uid` = `votes`.`uid` WHERE `votes`.`voteid` IN (5, 4, 2, 7) AND `votes`.`active` = 1 AND `votes`.`timestamp` > '2012-03-01 00:00:00' AND `userauth`.`authid` = 2";
$query = $this->db->query($sql);
LEFT JOINの代わりに標準のJOINを使用すると、必要なデータは返されませんが、エラーは発生しません。
サーバー情報：
Apache / 2.2.14（Ubuntu）PHP / 5.3.2 MySQL 5.1.63 CodeIgniter 2.1.2
application / config / database.php
$active_group = 'default';
$active_record = TRUE;
$db['default']['hostname'] = 'localhost';
$db['default']['username'] = 'some_user';
$db['default']['password'] = 'some_pass';
$db['default']['database'] = 'some_db';
$db['default']['dbdriver'] = 'mysqli';
$db['default']['dbprefix'] = '';
$db['default']['pconnect'] = TRUE;
$db['default']['db_debug'] = TRUE;
$db['default']['cache_on'] = FALSE;
$db['default']['cachedir'] = '';
$db['default']['char_set'] = 'utf8';
$db['default']['dbcollat'] = 'utf8_general_ci';
$db['default']['swap_pre'] = '';
$db['default']['autoinit'] = TRUE;
$db['default']['stricton'] = FALSE;