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У меня возникла странная проблема и вам нужна помощь в определении причины. До сих пор я мог наблюдать симптомы. Что это значит, так это то, что MySQL выполняет запрос по-разному в зависимости от того, есть ли у меня символ новой строки перед моей первой «LEFT JOIN».Почему пробелы влияют на MySQL Left Join и возвращают значения NULL?
Вот мои настройки:
Я бегу запросов на экземпляре базы данных MySQL, предоставленной www.xeround.com. Я использую структуру Kohana версии 3.0. Я запускаю PHP 5.3.3 FastCGI на Lighttpd. Я составил PHP с MySQL Native Driver:
--with-MySQL = mysqlnd --with-MySQLi = mysqlnd --with-PDO-MySQL = mysqlnd
Я использую по умолчанию Kohana 3 базы данных MySQL драйвер на и QueryBuilder.
Я собираюсь пропустить PHP-код и разделить SQL с тех пор, как это кажется проблемой. QueryBuilder заканчивает строительство этого запроса:
SELECT `fieldreps`.`user_id` AS `fieldreps.user_id`, `fieldreps`.`availability_id` AS `fieldreps.availability_id`, `fieldreps`.`applicant_type` AS `fieldreps.applicant_type`, `fieldreps`.`license_number` AS `fieldreps.license_number`, `fieldreps`.`license_exp` AS `fieldreps.license_exp`, `fieldreps`.`license_state` AS `fieldreps.license_state`, `fieldreps`.`car` AS `fieldreps.car`, `fieldreps`.`authorized_worker` AS `fieldreps.authorized_worker`, `fieldreps`.`restrictions` AS `fieldreps.restrictions`, `fieldreps`.`night` AS `fieldreps.night`, `fieldreps`.`day` AS `fieldreps.day`, `fieldreps`.`longer` AS `fieldreps.longer`, `fieldreps`.`commitment` AS `fieldreps.commitment`, `fieldreps`.`travel_metro` AS `fieldreps.travel_metro`, `fieldreps`.`travel_states` AS `fieldreps.travel_states`, `fieldreps`.`big_employee` AS `fieldreps.big_employee`, `fieldreps`.`employed` AS `fieldreps.employed`, `fieldreps`.`retail` AS `fieldreps.retail`, `fieldreps`.`status` AS `fieldreps.status`, `fieldreps`.`start` AS `fieldreps.start`, `fieldreps`.`sales` AS `fieldreps.sales`, `fieldreps`.`study` AS `fieldreps.study`, `fieldreps`.`relevant` AS `fieldreps.relevant`, `fieldreps`.`experience` AS `fieldreps.experience`, `fieldreps`.`claims` AS `fieldreps.claims`, `fieldreps`.`education` AS `fieldreps.education`, `fieldreps`.`degree_details` AS `fieldreps.degree_details`, `fieldreps`.`degree_institution` AS `fieldreps.degree_institution`, `fieldreps`.`other_training` AS `fieldreps.other_training`, `fieldreps`.`jobs` AS `fieldreps.jobs`, `fieldreps`.`current_training` AS `fieldreps.current_training`, `fieldreps`.`interested` AS `fieldreps.interested`, `fieldreps`.`achievements` AS `fieldreps.achievements`, `fieldreps`.`passions` AS `fieldreps.passions`, `fieldreps`.`ambitions` AS `fieldreps.ambitions`, `fieldreps`.`max_travel_time` AS `fieldreps.max_travel_time`, `fieldreps`.`creation_time` AS `fieldreps.creation_time`, `fieldreps`.`resume` AS `fieldreps.resume`, `users`.`user_id` AS `users.user_id`, `users`.`email` AS `users.email`, `users`.`name` AS `users.name`, `users`.`password` AS `users.password`, `users`.`given_name` AS `users.given_name`, `users`.`title` AS `users.title`, `users`.`nationality` AS `users.nationality`, `availabilities`.`availability_id` AS `availabilities.availability_id`, `availabilities`.`fieldrep_id` AS `availabilities.fieldrep_id`, `availabilities`.`mon_start` AS `availabilities.mon_start`, `availabilities`.`mon_end` AS `availabilities.mon_end`, `availabilities`.`tue_start` AS `availabilities.tue_start`, `availabilities`.`tue_end` AS `availabilities.tue_end`, `availabilities`.`wed_start` AS `availabilities.wed_start`, `availabilities`.`wed_end` AS `availabilities.wed_end`, `availabilities`.`thur_start` AS `availabilities.thur_start`, `availabilities`.`thur_end` AS `availabilities.thur_end`, `availabilities`.`fri_start` AS `availabilities.fri_start`, `availabilities`.`fri_end` AS `availabilities.fri_end`, `availabilities`.`sat_start` AS `availabilities.sat_start`, `availabilities`.`sat_end` AS `availabilities.sat_end`, `availabilities`.`sun_start` AS `availabilities.sun_start`, `availabilities`.`sun_end` AS `availabilities.sun_end` FROM `fieldreps` AS `fieldreps` LEFT JOIN `users` ON (`fieldreps`.`user_id` = `users`.`user_id`) LEFT JOIN `availabilities` ON (`fieldreps`.`availability_id` = `availabilities`.`availability_id`)
который возвращает результат как это: (. Я удалил большую часть возвращаемых полей из таблицы Fieldreps, чтобы держать его коротким и менее личный)
[0] => Array
(
[fieldreps.user_id] => 1f01f4c2-43fd-550d-a53d-1f191786ebad
[fieldreps.availability_id] => e31b0773-ecba-41d1-8ebb-7ac718496456
[fieldreps.car] => Yes
[fieldreps.authorized_worker] => Yes
[fieldreps.restrictions] => Has Restrictions: No
[fieldreps.night] => Yes
[fieldreps.day] => Yes
[fieldreps.longer] => Yes
[users.user_id] => 1f01f4c2-43fd-550d-a53d-1f191786ebad
[users.email] => [email protected]
[users.name] => Jones
[users.password] =>
[users.given_name] => Fred
[users.title] => Miss
[users.nationality] =>
[availabilities.availability_id] =>
[availabilities.fieldrep_id] =>
[availabilities.mon_start] =>
[availabilities.mon_end] =>
[availabilities.tue_start] =>
[availabilities.tue_end] =>
[availabilities.wed_start] =>
[availabilities.wed_end] =>
[availabilities.thur_start] =>
[availabilities.thur_end] =>
[availabilities.fri_start] =>
[availabilities.fri_end] =>
[availabilities.sat_start] =>
[availabilities.sat_end] =>
[availabilities.sun_start] =>
[availabilities.sun_end] =>
)
[1] => Array
(
[fieldreps.user_id] => 812c3a9f-d7d8-565a-a886-1b182753dd41
[fieldreps.availability_id] =>
[fieldreps.car] => 1
[fieldreps.authorized_worker] => 1
[fieldreps.restrictions] =>
[fieldreps.night] => 1
[fieldreps.day] => 1
[fieldreps.longer] => 1
[users.user_id] => 812c3a9f-d7d8-565a-a886-1b182753dd41
[users.email] => [email protected]
[users.name] => Smith
[users.password] =>
[users.given_name] => Jill
[users.title] =>
[users.nationality] =>
[availabilities.availability_id] =>
[availabilities.fieldrep_id] =>
[availabilities.mon_start] =>
[availabilities.mon_end] =>
[availabilities.tue_start] =>
[availabilities.tue_end] =>
[availabilities.wed_start] =>
[availabilities.wed_end] =>
[availabilities.thur_start] =>
[availabilities.thur_end] =>
[availabilities.fri_start] =>
[availabilities.fri_end] =>
[availabilities.sat_start] =>
[availabilities.sat_end] =>
[availabilities.sun_start] =>
[availabilities.sun_end] =>
Тем не менее, когда я вставить символ новой строки непосредственно перед первым LEFT JOIN, как это:
SELECT `fieldreps`.`user_id` AS `fieldreps.user_id`, `fieldreps`.`availability_id` AS `fieldreps.availability_id`, `fieldreps`.`applicant_type` AS `fieldreps.applicant_type`, `fieldreps`.`license_number` AS `fieldreps.license_number`, `fieldreps`.`license_exp` AS `fieldreps.license_exp`, `fieldreps`.`license_state` AS `fieldreps.license_state`, `fieldreps`.`car` AS `fieldreps.car`, `fieldreps`.`authorized_worker` AS `fieldreps.authorized_worker`, `fieldreps`.`restrictions` AS `fieldreps.restrictions`, `fieldreps`.`night` AS `fieldreps.night`, `fieldreps`.`day` AS `fieldreps.day`, `fieldreps`.`longer` AS `fieldreps.longer`, `fieldreps`.`commitment` AS `fieldreps.commitment`, `fieldreps`.`travel_metro` AS `fieldreps.travel_metro`, `fieldreps`.`travel_states` AS `fieldreps.travel_states`, `fieldreps`.`big_employee` AS `fieldreps.big_employee`, `fieldreps`.`employed` AS `fieldreps.employed`, `fieldreps`.`retail` AS `fieldreps.retail`, `fieldreps`.`status` AS `fieldreps.status`, `fieldreps`.`start` AS `fieldreps.start`, `fieldreps`.`sales` AS `fieldreps.sales`, `fieldreps`.`study` AS `fieldreps.study`, `fieldreps`.`relevant` AS `fieldreps.relevant`, `fieldreps`.`experience` AS `fieldreps.experience`, `fieldreps`.`claims` AS `fieldreps.claims`, `fieldreps`.`education` AS `fieldreps.education`, `fieldreps`.`degree_details` AS `fieldreps.degree_details`, `fieldreps`.`degree_institution` AS `fieldreps.degree_institution`, `fieldreps`.`other_training` AS `fieldreps.other_training`, `fieldreps`.`jobs` AS `fieldreps.jobs`, `fieldreps`.`current_training` AS `fieldreps.current_training`, `fieldreps`.`interested` AS `fieldreps.interested`, `fieldreps`.`achievements` AS `fieldreps.achievements`, `fieldreps`.`passions` AS `fieldreps.passions`, `fieldreps`.`ambitions` AS `fieldreps.ambitions`, `fieldreps`.`max_travel_time` AS `fieldreps.max_travel_time`, `fieldreps`.`creation_time` AS `fieldreps.creation_time`, `fieldreps`.`resume` AS `fieldreps.resume`, `users`.`user_id` AS `users.user_id`, `users`.`email` AS `users.email`, `users`.`name` AS `users.name`, `users`.`password` AS `users.password`, `users`.`given_name` AS `users.given_name`, `users`.`title` AS `users.title`, `users`.`nationality` AS `users.nationality`, `availabilities`.`availability_id` AS `availabilities.availability_id`, `availabilities`.`fieldrep_id` AS `availabilities.fieldrep_id`, `availabilities`.`mon_start` AS `availabilities.mon_start`, `availabilities`.`mon_end` AS `availabilities.mon_end`, `availabilities`.`tue_start` AS `availabilities.tue_start`, `availabilities`.`tue_end` AS `availabilities.tue_end`, `availabilities`.`wed_start` AS `availabilities.wed_start`, `availabilities`.`wed_end` AS `availabilities.wed_end`, `availabilities`.`thur_start` AS `availabilities.thur_start`, `availabilities`.`thur_end` AS `availabilities.thur_end`, `availabilities`.`fri_start` AS `availabilities.fri_start`, `availabilities`.`fri_end` AS `availabilities.fri_end`, `availabilities`.`sat_start` AS `availabilities.sat_start`, `availabilities`.`sat_end` AS `availabilities.sat_end`, `availabilities`.`sun_start` AS `availabilities.sun_start`, `availabilities`.`sun_end` AS `availabilities.sun_end` FROM `fieldreps` AS `fieldreps`
LEFT JOIN `users` ON (`fieldreps`.`user_id` = `users`.`user_id`) LEFT JOIN `availabilities` ON (`fieldreps`.`availability_id` = `availabilities`.`availability_id`)
теперь я получаю результат я хочу:
[0] => Array
(
[fieldreps.user_id] => 1f01f4c2-43fd-550d-a53d-1f191786ebad
[fieldreps.availability_id] => e31b0773-ecba-41d1-8ebb-7ac718496456
[fieldreps.car] => Yes
[fieldreps.authorized_worker] => Yes
[fieldreps.restrictions] => Has Restrictions: No
[fieldreps.night] => Yes
[fieldreps.day] => Yes
[fieldreps.longer] => Yes
[users.user_id] => 1f01f4c2-43fd-550d-a53d-1f191786ebad
[users.email] => [email protected]
[users.name] => Jones
[users.password] =>
[users.given_name] => Fred
[users.title] => Miss
[users.nationality] =>
[availabilities.availability_id] => e31b0773-ecba-41d1-8ebb-7ac718496456
[availabilities.fieldrep_id] => 1f01f4c2-43fd-550d-a53d-1f191786ebad
[availabilities.mon_start] => 540
[availabilities.mon_end] => 1020
[availabilities.tue_start] => 540
[availabilities.tue_end] => 1020
[availabilities.wed_start] => 540
[availabilities.wed_end] => 1020
[availabilities.thur_start] => 540
[availabilities.thur_end] => 1020
[availabilities.fri_start] => 540
[availabilities.fri_end] => 1020
[availabilities.sat_start] =>
[availabilities.sat_end] =>
[availabilities.sun_start] =>
[availabilities.sun_end] =>
)
[1] => Array
(
[fieldreps.user_id] => 812c3a9f-d7d8-565a-a886-1b182753dd41
[fieldreps.availability_id] =>
[fieldreps.car] => 1
[fieldreps.authorized_worker] => 1
[fieldreps.restrictions] =>
[fieldreps.night] => 1
[fieldreps.day] => 1
[fieldreps.longer] => 1
[users.user_id] => 812c3a9f-d7d8-565a-a886-1b182753dd41
[users.email] => [email protected]
[users.name] => Smith
[users.password] =>
[users.given_name] => Jill
[users.title] =>
[users.nationality] =>
[availabilities.availability_id] =>
[availabilities.fieldrep_id] =>
[availabilities.mon_start] =>
[availabilities.mon_end] =>
[availabilities.tue_start] =>
[availabilities.tue_end] =>
[availabilities.wed_start] =>
[availabilities.wed_end] =>
[availabilities.thur_start] =>
[availabilities.thur_end] =>
[availabilities.fri_start] =>
[availabilities.fri_end] =>
[availabilities.sat_start] =>
[availabilities.sat_end] =>
[availabilities.sun_start] =>
[availabilities.sun_end] =>
Обратите внимание, что LEFT JOIN в таблице Users отлично работает в обоих сценариях. Я также попытался добавить новую строку перед вторым LEFT JOIN, а не первым. Такой же нежелательный результат. Единственное, что я могу найти, чтобы исправить это, - это поставить новую строку перед первой LEFT JOIN. Запросы, которые построены QueryBuilder и отправленные в MySQL, всегда являются длинными, однострочными, минимальными пробелами ... нет новых строк! Это первый раз, когда я столкнулся с этой проблемой. Я просто не могу поверить, что было бы требование разместить новую строку перед первым LEFT JOIN.
Мой вопрос сводится к этим пунктам:
- это должно ли происходить таким образом? (Пробел, результатом которого является результат запроса)
- Каков наилучший способ получить результат, который я хочу.
Я не эксперт по SQL, иначе мне, вероятно, не нужно было задавать этот вопрос. Я уверен, что есть кое-что, что я пропускаю.
Спасибо,
Джонатану