SELECT data_key, data_value
FROM xf_data_registry
WHERE data_key IN ('options', 'languages', 'contentTypes', 'codeEventListeners', 'deferredRun', 'simpleCache', 'addOns', 'defaultStyleProperties', 'routeFiltersIn', 'routeFiltersOut', 'routesPublic', 'nodeTypes', 'bannedIps', 'discouragedIps', 'styles', 'displayStyles', 'userBanners', 'smilies', 'bbCode', 'threadPrefixes', 'userTitleLadder', 'reportCounts', 'moderationCounts', 'userModerationCounts', 'notices', 'userFieldsInfo')
Run Time: 0.000704
Select Type | Table | Type | Possible Keys | Key | Key Len | Ref | Rows | Extra |
---|
SIMPLE | xf_data_registry | range | PRIMARY | PRIMARY | 27 | | 26 | Using where |
SELECT data_key, data_value
FROM xf_data_registry
WHERE data_key IN ('brListenerClasses', 'brBriviumAddOns')
Run Time: 0.000154
Select Type | Table | Type | Possible Keys | Key | Key Len | Ref | Rows | Extra |
---|
SIMPLE | xf_data_registry | range | PRIMARY | PRIMARY | 27 | | 2 | Using where |
SELECT *
FROM xf_brivium_addon
ORDER BY addon_id
Run Time: 0.000142
Select Type | Table | Type | Possible Keys | Key | Key Len | Ref | Rows | Extra |
---|
SIMPLE | xf_brivium_addon | index | | PRIMARY | 77 | | 1 | |
INSERT INTO xf_data_registry
(data_key, data_value)
VALUES
(?, ?)
ON DUPLICATE KEY UPDATE
data_value = VALUES(data_value)
Params: brBriviumAddOns, a:0:{}
Run Time: 0.000128
SELECT cache_value
FROM xf_permission_combination
WHERE permission_combination_id = ?
Params: 1
Run Time: 0.000173
Select Type | Table | Type | Possible Keys | Key | Key Len | Ref | Rows | Extra |
---|
SIMPLE | xf_permission_combination | const | PRIMARY | PRIMARY | 4 | const | 1 | |
SELECT thread.*
,
user.gender, user.avatar_date, user.gravatar,
NULL AS thread_read_date,
0 AS thread_reply_banned,
0 AS thread_is_watched,
'' AS draft_message, NULL AS draft_extra
FROM xf_thread AS thread
LEFT JOIN xf_user AS user ON
(user.user_id = thread.user_id)
WHERE thread.thread_id = ?
Params: 289284
Run Time: 0.000369
Select Type | Table | Type | Possible Keys | Key | Key Len | Ref | Rows | Extra |
---|
SIMPLE | thread | const | PRIMARY | PRIMARY | 4 | const | 1 | |
SIMPLE | user | const | PRIMARY | PRIMARY | 4 | const | 1 | |
SELECT node.*, forum.*
,
permission.cache_value AS node_permission_cache,
NULL AS forum_read_date
FROM xf_forum AS forum
INNER JOIN xf_node AS node ON (node.node_id = forum.node_id)
LEFT JOIN xf_permission_cache_content AS permission
ON (permission.permission_combination_id = 1
AND permission.content_type = 'node'
AND permission.content_id = forum.node_id)
WHERE node.node_id = ?
Params: 38
Run Time: 0.000453
Select Type | Table | Type | Possible Keys | Key | Key Len | Ref | Rows | Extra |
---|
SIMPLE | forum | const | PRIMARY | PRIMARY | 4 | const | 1 | |
SIMPLE | node | const | PRIMARY | PRIMARY | 4 | const | 1 | |
SIMPLE | permission | const | PRIMARY | PRIMARY | 35 | const,const,const | 1 | |
SELECT post.*
,
thread.*, thread.user_id AS thread_user_id, thread.username AS thread_username,
thread.post_date AS thread_post_date,
post.user_id, post.username, post.post_date,
bb_code_parse_cache.parse_tree AS message_parsed, bb_code_parse_cache.cache_version AS message_cache_version,
user.*, IF(user.username IS NULL, post.username, user.username) AS username,
user_profile.*,
user_privacy.*,
signature_parse_cache.parse_tree AS signature_parsed, bb_code_parse_cache.cache_version AS signature_cache_version,
session_activity.view_date AS last_view_date,
0 AS like_date
FROM xf_post AS post
INNER JOIN xf_thread AS thread ON
(thread.thread_id = post.thread_id)
LEFT JOIN xf_bb_code_parse_cache AS bb_code_parse_cache ON
(bb_code_parse_cache.content_type = 'post' AND bb_code_parse_cache.content_id = post.post_id)
LEFT JOIN xf_user AS user ON
(user.user_id = post.user_id)
LEFT JOIN xf_user_profile AS user_profile ON
(user_profile.user_id = post.user_id)
LEFT JOIN xf_user_privacy AS user_privacy ON
(user_privacy.user_id = post.user_id)
LEFT JOIN xf_bb_code_parse_cache AS signature_parse_cache ON
(signature_parse_cache.content_type = 'signature' AND signature_parse_cache.content_id = post.user_id)
LEFT JOIN xf_session_activity AS session_activity ON
(post.user_id > 0 AND session_activity.user_id = post.user_id AND session_activity.unique_key = CAST(post.user_id AS BINARY))
WHERE (
(post.thread_id = ? AND (post.position >= 0 AND post.position < 10) )
)
AND (post.message_state IN ('visible'))
ORDER BY post.position ASC, post.post_date ASC
Params: 289284
Run Time: 0.002325
Select Type | Table | Type | Possible Keys | Key | Key Len | Ref | Rows | Extra |
---|
SIMPLE | thread | const | PRIMARY | PRIMARY | 4 | const | 1 | Using filesort |
SIMPLE | post | ref | thread_id_post_date,thread_id_position | thread_id_post_date | 4 | const | 1 | Using index condition; Using where |
SIMPLE | bb_code_parse_cache | eq_ref | content_type_id | content_type_id | 31 | const,xenforo.cc.post.post_id | 1 | Using where |
SIMPLE | user | eq_ref | PRIMARY | PRIMARY | 4 | xenforo.cc.post.user_id | 1 | |
SIMPLE | user_profile | eq_ref | PRIMARY | PRIMARY | 4 | xenforo.cc.post.user_id | 1 | |
SIMPLE | user_privacy | eq_ref | PRIMARY | PRIMARY | 4 | xenforo.cc.post.user_id | 1 | |
SIMPLE | signature_parse_cache | eq_ref | content_type_id | content_type_id | 31 | const,xenforo.cc.post.user_id | 1 | Using where |
SIMPLE | session_activity | eq_ref | PRIMARY | PRIMARY | 22 | xenforo.cc.post.user_id,func | 1 | Using where |
INSERT INTO xf_thread_view
(thread_id)
VALUES
(?)
Params: 289284
Run Time: 0.000089
INSERT INTO `xf_session` (`session_id`, `session_data`, `expiry_date`) VALUES (?, ?, ?)
Params: 14a2de3233263113c3dc22574b7aceec, , 1714402567
Run Time: 0.000693
INSERT INTO xf_session_activity
(user_id, unique_key, ip, controller_name, controller_action, view_state, params, view_date, robot_key)
VALUES
(?, ?, ?, ?, ?, ?, ?, ?, ?)
ON DUPLICATE KEY UPDATE
ip = VALUES(ip),
controller_name = VALUES(controller_name),
controller_action = VALUES(controller_action),
view_state = VALUES(view_state),
params = VALUES(params),
view_date = VALUES(view_date),
robot_key = VALUES(robot_key)
Params: 0, , , XenForo_ControllerPublic_Thread, Index, valid, thread_id=289284, 1714398967,
Run Time: 0.000110
INSERT INTO xf_bb_code_parse_cache
(content_type, content_id, parse_tree, cache_version, cache_date)
VALUES (?, ?, ?, ?, ?)
ON DUPLICATE KEY UPDATE parse_tree = VALUES(parse_tree),
cache_version = VALUES(cache_version),
cache_date = VALUES(cache_date)
Params: post, 295901, a:5:{i:0;a:4:{s:3:"tag";s:3:"img";s:6:"option";N;s:8:"original";a:2:{i:0;s:5:"[IMG]";i:1;s:6:"[/IMG]";}s:8:"children";a:1:{i:0;s:38:"http://pic1.zhimg.com/da8e974dc_is.jpg";}}i:1;s:14:" 知乎用户 ";i:2;a:4:{s:3:"tag";s:3:"url";s:6:"option";s:57:"https://www.zhihu.com/question/361939407/answer/967860312";s:8:"original";a:2:{i:0;s:65:"[URL='https://www.zhihu.com/question/361939407/answer/967860312']";i:1;s:6:"[/URL]";}s:8:"children";a:1:{i:0;s:12:"阅读原文";}}i:3;s:3634:"
这个问题在 2005 年左右,几乎相当于一个钱学森之问了:“为什么中国地大物博,却造不出来一台能和佳能索尼消费级 DC 相比的产品?更何况是单反”。当时我不负责这条线,工作原因我也被卷进去参与了讨论,期间还受邀参观过尼康和奥林巴斯在珠海的镜片工厂。我自己总结的原因如下:
第一部分:机身设计与光学性能,与日本差距巨大。以尼康为例吧,尼康在 1917 年创业,名字就叫日本光学工业株式会社。从那时候开始起,尼康就一直在研究光学方面的东西。整个二战期间,日军使用的所有光学器材,特别是海军使用的各种光学观测系统,都是尼康制造的。在把科研成果落实到低成本上的经验,日本要领先中国半个世纪都不止。有些东西我们不是弄不出来,而是不能工业化低成本生产,这是我们在光学能力上和日本差距最大的地方。至今日本几大公司也是全球顶尖的光学性能公司,而我们自己一家靠谱的光学厂都没有。
尼康在 1920S 就开始研发相机,并在那个年代注册了 Nikkor 镜头品牌,至今整整 100 年。这 100 年里,我们有过海鸥,有过凤凰,因为各种原因吧,里里外外都有,没有一家能保存到现在。
1959 年,尼康第一台单反相机——Nikon F 诞生。2020 年,尼康最新的全画幅单反数码相机阵列,使用的还是 1959 年的 F 卡口。这已经过去了 60 年了。
没有自己的机身和光学系统,在相机行业就相当于一个孤儿。当年富士搞 S2Pro DSLR,竟然用的是尼康的机身,为什么?就因为富士没有自己的单反机身和卡口标准,最后只能去买尼康的授权。
我们自己的单反厂商,只能靠兼容这些卡口才能生存,在漫长的发展历史中,没有自己的卡口国际标准,也不被别人承认。
第二部分:半导体技术,电子技术,马达技术长期落后于世界。可能现在华为搞了几块芯片之后大家都很沸腾,但是在相机领域,我们长期落后于世界主流水平。2005 年,当时海鸥也很不服气,觉得尼康能做的他们也能做,结果完全搞不了。2003 年,佳能就已经发布了第一代专用的 DSP 芯片 Digic,用于 EOS300D,目前发展了多少代我已经不记得了。而索尼更是在 20 年前就广泛布局了 CCD 和 CMOS 业务,当年敢于进军这个产业的还有富士的 SuperCCD,只是最后被索尼干垮了。
再说个。
这个行业,就是不积跬步无以至千里的,索尼用了几十年,才有了今天的感光元件成就(而且对中国相机厂商几乎从不出口)。
总结一下,我们为什么没有数码相机公司?
没有机身,没有光学系统积累,没有卡口标准,没有芯片技术,没有算法,没有马达技术,没有国际一流水准的镜头加工技术,没有低成本的镜片生产水平。
更没有尼康佳能索尼的技术输出和授权,我们想买人家都不卖给我们,人家可以全套授权给富士,就不可能授权给我们。
所以,没有..... 另外,反对那个高赞答案。数码相机在超高速增长的年代里,我们依然搞不出来,而国家确实是想搞出来的,把这个当战略项目,还是搞不出来。
相机不只是相机,这是一个大国在光学和影像技术上的战略能力,尼康不只是相机公司,还是全球领先的医学影像公司。这不是目前相机市场不大就能搪塞过去的。
";i:4;a:4:{s:3:"tag";s:3:"url";s:6:"option";s:39:"http://www.zhihu.com/question/361939407";s:8:"original";a:2:{i:0;s:47:"[URL='http://www.zhihu.com/question/361939407']";i:1;s:6:"[/URL]";}s:8:"children";a:1:{i:0;s:12:"阅读原文";}}}, 1621686945, 1714398967
Run Time: 0.000683