Module: ArJdbc::MySQL::Column
- Defined in:
- lib/arjdbc/mysql/column.rb
Overview
Column behavior based on (abstract) MySQL adapter in Rails.
Instance Attribute Summary collapse
-
#collation ⇒ Object
readonly
Returns the value of attribute collation.
-
#extra ⇒ Object
readonly
Returns the value of attribute extra.
-
#strict ⇒ Object
readonly
Returns the value of attribute strict.
Instance Method Summary collapse
- #extract_default(default) ⇒ Object
- #extract_limit(sql_type) ⇒ Object
- #has_default? ⇒ Boolean
-
#missing_default_forged_as_empty_string?(default) ⇒ Boolean
MySQL misreports NOT NULL column default when none is given.
- #simplified_type(field_type) ⇒ Object
Instance Attribute Details
#collation ⇒ Object (readonly)
Returns the value of attribute collation.
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# File 'lib/arjdbc/mysql/column.rb', line 13 def collation @collation end |
#extra ⇒ Object (readonly)
Returns the value of attribute extra.
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# File 'lib/arjdbc/mysql/column.rb', line 13 def extra @extra end |
#strict ⇒ Object (readonly)
Returns the value of attribute strict.
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# File 'lib/arjdbc/mysql/column.rb', line 13 def strict @strict end |
Instance Method Details
#extract_default(default) ⇒ Object
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# File 'lib/arjdbc/mysql/column.rb', line 15 def extract_default(default) if sql_type =~ /blob/i || type == :text if default.blank? return null ? nil : '' else raise ArgumentError, "#{type} columns cannot have a default value: #{default.inspect}" end elsif missing_default_forged_as_empty_string?(default) nil else super end end |
#extract_limit(sql_type) ⇒ Object
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# File 'lib/arjdbc/mysql/column.rb', line 78 def extract_limit(sql_type) case sql_type when /blob|text/i case sql_type when /tiny/i 255 when /medium/i 16777215 when /long/i 2147483647 # mysql only allows 2^31-1, not 2^32-1, somewhat inconsistently with the tiny/medium/normal cases else super # we could return 65535 here, but we leave it undecorated by default end when /^bigint/i; 8 when /^int/i; 4 when /^mediumint/i; 3 when /^smallint/i; 2 when /^tinyint/i; 1 when /^enum\((.+)\)/i # 255 $1.split(',').map{ |enum| enum.strip.length - 2 }.max when /^(bool|date|float|int|time)/i nil else super end end |
#has_default? ⇒ Boolean
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# File 'lib/arjdbc/mysql/column.rb', line 29 def has_default? return false if sql_type =~ /blob/i || type == :text #mysql forbids defaults on blob and text columns super end |
#missing_default_forged_as_empty_string?(default) ⇒ Boolean
MySQL misreports NOT NULL column default when none is given. We can't detect this for columns which may have a legitimate '' default (string) but we can for others (integer, datetime, boolean, and the rest).
Test whether the column has default '', is not null, and is not a type allowing default ''.
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# File 'lib/arjdbc/mysql/column.rb', line 112 def missing_default_forged_as_empty_string?(default) type != :string && !null && default == '' end |
#simplified_type(field_type) ⇒ Object
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# File 'lib/arjdbc/mysql/column.rb', line 34 def simplified_type(field_type) if adapter && adapter.emulate_booleans? return :boolean if field_type.downcase.index('tinyint(1)') end case field_type when /enum/i, /set/i then :string when /year/i then :integer # :tinyint : {:name=>"tinyint", :limit=>3} # :"tinyint unsigned" : {:name=>"tinyint unsigned", :limit=>3} # :bigint : {:name=>"bigint", :limit=>19} # :"bigint unsigned" : {:name=>"bigint unsigned", :limit=>20} # :integer : {:name=>"integer", :limit=>10} # :"integer unsigned" : {:name=>"integer unsigned", :limit=>10} # :int : {:name=>"int", :limit=>10} # :"int unsigned" : {:name=>"int unsigned", :limit=>10} # :mediumint : {:name=>"mediumint", :limit=>7} # :"mediumint unsigned" : {:name=>"mediumint unsigned", :limit=>8} # :smallint : {:name=>"smallint", :limit=>5} # :"smallint unsigned" : {:name=>"smallint unsigned", :limit=>5} when /int/i then :integer when /double/i then :float # double precision (alias) when 'bool' then :boolean when 'char' then :string # :mediumtext => {:name=>"mediumtext", :limit=>16777215} # :longtext => {:name=>"longtext", :limit=>2147483647} # :text => {:name=>"text"} # :tinytext => {:name=>"tinytext", :limit=>255} when /text/i then :text when 'long varchar' then :text # :"long varbinary" => {:name=>"long varbinary", :limit=>16777215} # :varbinary => {:name=>"varbinary", :limit=>255} when /binary/i then :binary # :mediumblob => {:name=>"mediumblob", :limit=>16777215} # :longblob => {:name=>"longblob", :limit=>2147483647} # :blob => {:name=>"blob", :limit=>65535} # :tinyblob => {:name=>"tinyblob", :limit=>255} when /blob/i then :binary when /^bit/i then :binary else super end end |