Question

我正在做这样的不同查询：

Offer.where("id IN (?) AND foo = ?", offer_ids, 'bar')

其中计算了offer_ids，其长度约为1.000 ids。

这会导致development.log的条目很长，如：

Offer Load (12.9ms)  SELECT `offers`.* FROM `offers` WHERE (id IN (156439476,162525730,169378363,197193532,209583012,212783238,236381946,260584008,267542041,140892256,154059101,157130091,158223924,161242255,161410617,169374703,184305303,187582050,234519939,235460328,252011721,253958427,257583669,260506433,262371001,262925076,265363980,266580943,268164854,271348458,272595168,272965063,141293866,162515580,195738185,210118609,210183244,210783954,212896682,219931290,224907551,225764370,227558502,234479337,234536939,236329414,238409428,241871979,245480324,245491111,245507734,253281480,254462074,257921737,265282309,265542934,266584572,267530034,268798204,271548316,272761011,272899348,273012205,119125136,134552742,166766466,169187658,213728958,213732981,225761919,234827176,247156634,247196151,247214973,247659810,259275332,261664338,262780711,267516898,267741935,270442768,271445586,271630463,272560287,272643405,272957626,106364954,205619149,213425974,213731373,243644164,266104747,266428301,266947751,268013142,126413832,157986541,175322047,204080600,205821543,205821564,205830753,205848558,207430869,207442535,207458847,207952331,208122137,213731142,217001805,226506891,228735112,243682190,257949941,265512977,265908636,268833366,269372138,270447643,271237573,59037247,59169923,662 ...) AND foo = 'bar')

我实际上对这些日志条目感兴趣，但不是特定的ID，滚动这些长条目会减慢我的优化。

是否有一种gem或简单的方法来减少mysql慢速查询日志的方式：

Offer Load (12.9ms)  SELECT `offers`.* FROM `offers` WHERE (id IN (?) AND foo = ?)

Answer 1

我不知道有什么方法可以更改日志。但是，如果您使用的是最新版本的rails，则可以使用子查询，这可能是防止长行日志记录的一种方法。

例如，

如果您目前有：

offer_ids = @business.offers.map(&:id) # this is an array object
Offer.where("id IN (?) AND foo = ?", offer_ids, 'bar')

您可以将代码重构为：

offer_ids = @business.offers # this is an ActiveRelation object
# offer_ids = @business.select(:id).offers # you can use this line instead of above line

Offer.where(:id => offer_ids, :foo => 'bar')

在这种情况下，您将收到如下查询：

SELECT `offers`.* FROM `offers` WHERE (id IN (SELECT id FROM `offers` WHERE business_id = 4) AND foo = 'bar')

不同之处在于您是否传递了Array个对象或ActiveRelation个对象。

ActiveRelation对象是您使用尚未执行查询的where，select，limit等查询方法时获得的对象。在这种情况下，请注意不要使用count，maximum，all或任何其他数组方法（例如。map，select）等方法。将强制查询运行，从而生成Array。

缩短rails中的长SQL日志条目

1 个答案: