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Sequel 支持一个boolean类型。它将true和存储false在SQLite 中tf如果您再次阅读,数据将转换回truefalse

SQLite 本身更喜欢存储true为 1 和false0(一些 SQLite 管理工具期望它)。如果我将布尔值也存储为“1”,Sequel 也会将该值转换为“真”:

require 'sequel'
DB = Sequel.sqlite()#'test.db')
DB.create_table(:test){
  boolean :my_truth
  nvarchar :descr, :size => 10
}
DB[:test].insert(1, '1')
p DB[:test].filter(:descr => '1').first #-> {:my_truth=>true, :descr=>"1"}

但是,如果我选择 for true,则找不到任何值:

DB[:test].filter(:my_truth => true).each{|ds|
  puts "\t%s" % ds[:descr]
}

true"t"被发现:

DB[:test].insert(true, 'true')
DB[:test].insert('t', '"t"')
DB[:test].filter(:my_truth => true).each{|ds|
  puts "\t%s" % ds[:descr]    #true and 't'
}

假值也有类似的情况0......(请参阅问题后的示例代码)

所以我的问题是:我怎样才能DB[:test].filter(:my_truth => true)检测1-values和 DB[:test].filter(:my_truth => false)检测0-values?

我不是在寻找类似的东西DB[:test].filter(:my_truth => [true,1])

Activerecord Rails 3 SQLite3 Boolean false的类似问题

我使用续集 3.33.0


示例代码:

require 'sequel'
DB = Sequel.sqlite()#'test.db')
DB.create_table(:test){
  boolean :my_truth
  nvarchar :descr, :size => 10
  fixnum :line  #code line, where data is inserted
}

#All true:
DB[:test].insert(true, 'true', __LINE__)
DB[:test].insert('true', '"true"', __LINE__)
DB[:test].insert(1, 'one', __LINE__)
DB[:test].insert('t', 't', __LINE__)

#All false:
DB[:test].insert(false,'false', __LINE__)
DB[:test].insert('false','"false"', __LINE__)
DB[:test].insert(0,'zero', __LINE__)
DB[:test].insert('f', 'f', __LINE__)
DB[:test].insert('F', 'F', __LINE__)
DB[:test].insert(nil, 'nil', __LINE__)
DB[:test].insert('n', 'n', __LINE__)
DB[:test].insert('N', 'N', __LINE__)

#Also true
DB[:test].insert('x', 'x', __LINE__)
DB[:test].insert(' ', 'space', __LINE__)
DB[:test].insert('', 'empty', __LINE__)

puts "All true values:"
DB[:test].filter(:my_truth => true).each{|ds|
  puts "\t%s (line %i)" % [ds[:descr],  ds[:line] ]
}

puts "All false values:"
DB[:test].filter(:my_truth => false).each{|ds|
  puts "\t%s (line %i)" % [ds[:descr],  ds[:line] ]
}

puts "Data:"
DB[:test].each{|ds|
  puts "\t%-5s is <%s> (line %i)" % [ ds[:descr], ds[:my_truth].inspect, ds[:line] ]
}

结果:

All true values:
  true (line 10)
  t (line 13)
All false values:
  false (line 16)
  f (line 19)
Data:
  true  is <true> (line 10)
  "true" is <true> (line 11)
  one   is <true> (line 12)
  t     is <true> (line 13)
  false is <false> (line 16)
  "false" is <false> (line 17)
  zero  is <false> (line 18)
  f     is <false> (line 19)
  F     is <false> (line 20)
  nil   is <nil> (line 21)
  n     is <false> (line 22)
  N     is <false> (line 23)
  x     is <true> (line 26)
  space is <true> (line 27)
  empty is <true> (line 28)
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1 回答 1

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您可以使用 integer_booleans 设置来使用 1/0 作为真/假,而不是 't'/'f',请参阅http://sequel.rubyforge.org/rdoc-adapters/classes/Sequel/SQLite/DatabaseMethods.html . 这是一个例子:

DB = Sequel.sqlite(:integer_booleans=>true)
于 2012-05-24T15:10:29.087 回答