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
- #blob_or_text_column? ⇒ Boolean
- #case_sensitive? ⇒ Boolean
- #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.
13 14 15 |
# File 'lib/arjdbc/mysql/column.rb', line 13 def collation @collation end |
#extra ⇒ Object (readonly)
Returns the value of attribute extra.
13 14 15 |
# File 'lib/arjdbc/mysql/column.rb', line 13 def extra @extra end |
#strict ⇒ Object (readonly)
Returns the value of attribute strict.
13 14 15 |
# File 'lib/arjdbc/mysql/column.rb', line 13 def strict @strict end |
Instance Method Details
#blob_or_text_column? ⇒ Boolean
31 32 33 |
# File 'lib/arjdbc/mysql/column.rb', line 31 def blob_or_text_column? sql_type.index('blob') || type == :text end |
#case_sensitive? ⇒ Boolean
35 36 37 |
# File 'lib/arjdbc/mysql/column.rb', line 35 def case_sensitive? collation && !collation.match(/_ci$/) end |
#extract_default(default) ⇒ Object
15 16 17 18 19 20 21 22 23 24 |
# File 'lib/arjdbc/mysql/column.rb', line 15 def extract_default(default) if blob_or_text_column? return null || strict ? nil : '' if default.blank? raise ArgumentError, "#{type} columns cannot have a default value: #{default.inspect}" elsif missing_default_forged_as_empty_string?(default) nil else super end end |
#extract_limit(sql_type) ⇒ Object
83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 |
# File 'lib/arjdbc/mysql/column.rb', line 83 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
26 27 28 29 |
# File 'lib/arjdbc/mysql/column.rb', line 26 def has_default? return false if blob_or_text_column? #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 ''.
117 118 119 |
# File 'lib/arjdbc/mysql/column.rb', line 117 def missing_default_forged_as_empty_string?(default) type != :string && !null && default == '' end |
#simplified_type(field_type) ⇒ Object
39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 |
# File 'lib/arjdbc/mysql/column.rb', line 39 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 |