class DBI::ColumnInfo
This represents metadata for columns within a given table, such as the data type, whether or not the the column is a primary key, etc.
ColumnInfo is a delegate of Hash, but represents its keys indifferently, coercing all strings to symbols. It also has ostruct-like features, f.e.:
h = ColumnInfo.new({ "foo" => "bar" }) h[:foo] => "bar" h["foo"] => "bar" h.foo => "bar"
All of these forms have assignment forms as well.
Public Class Methods
new(hash=nil)
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Create a new ColumnInfo object.
If no Hash is provided, one will be created for you. The hash will be shallow cloned for storage inside the object, and an attempt will be made to convert all string keys to symbols.
In the event that both string and symbol keys are provided in the initial hash, we cannot safely route around collisions and therefore a TypeError is raised.
Calls superclass method
# File lib/dbi/columninfo.rb, line 37 def initialize(hash=nil) @hash = hash.dup rescue nil @hash ||= Hash.new # coerce all strings to symbols @hash.each_key do |x| if x.kind_of? String sym = x.to_sym if @hash.has_key? sym raise ::TypeError, "#{self.class.name} may construct from a hash keyed with strings or symbols, but not both" end @hash[sym] = @hash[x] @hash.delete(x) end end super(@hash) end
Public Instance Methods
[](key)
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# File lib/dbi/columninfo.rb, line 57 def [](key) @hash[key.to_sym] end
[]=(key, value)
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# File lib/dbi/columninfo.rb, line 61 def []=(key, value) @hash[key.to_sym] = value end
default()
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# File lib/dbi/columninfo.rb, line 65 def default() # :nodoc; XXX hack to get around Hash#default method_missing(:default) end
method_missing(sym, value=nil)
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# File lib/dbi/columninfo.rb, line 69 def method_missing(sym, value=nil) if sym.to_s =~ /=$/ sym = sym.to_s.sub(/=$/, '').to_sym @hash[sym] = value elsif sym.to_s =~ /\?$/ sym = sym.to_s.sub(/\?$/, '').to_sym @hash[sym] else @hash[sym] end end