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[rails.git] / lib / migrate.rb
1 module ActiveRecord
2   module ConnectionAdapters
3     module SchemaStatements
4       def quote_column_names(column_name)
5         Array(column_name).map { |e| quote_column_name(e) }.join(", ")
6       end
7
8       def add_primary_key(table_name, column_name, options = {})
9         column_names = Array(column_name)
10         quoted_column_names = column_names.map { |e| quote_column_name(e) }.join(", ")
11         execute "ALTER TABLE #{table_name} ADD PRIMARY KEY (#{quoted_column_names})"
12       end
13
14       def remove_primary_key(table_name)
15         execute "ALTER TABLE #{table_name} DROP PRIMARY KEY"
16       end
17
18       def add_foreign_key(table_name, column_name, reftbl, refcol = nil)
19         execute "ALTER TABLE #{table_name} ADD " +
20           "FOREIGN KEY (#{quote_column_names(column_name)}) " +
21           "REFERENCES #{reftbl} (#{quote_column_names(refcol || column_name)})"
22       end
23
24       alias_method :old_options_include_default?, :options_include_default?
25
26       def options_include_default?(options)
27         return false if options[:options] =~ /AUTO_INCREMENT/i
28         return old_options_include_default?(options)
29       end
30
31       alias_method :old_add_column_options!, :add_column_options!
32
33       def add_column_options!(sql, options)
34         sql << " UNSIGNED" if options[:unsigned]
35         old_add_column_options!(sql, options)
36         sql << " #{options[:options]}"
37       end
38     end
39
40     class MysqlAdapter
41       alias_method :old_native_database_types, :native_database_types
42
43       def native_database_types
44         types = old_native_database_types
45         types[:bigint] = { :name => "bigint", :limit => 20 }
46         types[:double] = { :name => "double" }
47         types
48       end
49
50       def change_column(table_name, column_name, type, options = {})
51         unless options_include_default?(options)
52           options[:default] = select_one("SHOW COLUMNS FROM #{table_name} LIKE '#{column_name}'")["Default"]
53
54           unless type == :string or type == :text
55             options.delete(:default) if options[:default] = "";
56           end
57         end
58
59         change_column_sql = "ALTER TABLE #{table_name} CHANGE #{column_name} #{column_name} #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}"
60         add_column_options!(change_column_sql, options)
61         execute(change_column_sql) 
62       end
63
64       def myisam_table
65         return { :id => false, :force => true, :options => "ENGINE=MyIsam" }
66       end
67
68       def innodb_table
69         return { :id => false, :force => true, :options => "ENGINE=InnoDB" }
70       end
71     end
72   end
73 end