2 module ConnectionAdapters
3 module SchemaStatements
4 def quote_column_names(column_name)
5 Array(column_name).map { |e| quote_column_name(e) }.join(", ")
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})"
14 def remove_primary_key(table_name)
15 execute "ALTER TABLE #{table_name} DROP PRIMARY KEY"
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)})"
24 alias_method :old_options_include_default?, :options_include_default?
26 def options_include_default?(options)
27 return false if options[:options] =~ /AUTO_INCREMENT/i
28 return old_options_include_default?(options)
31 alias_method :old_add_column_options!, :add_column_options!
33 def add_column_options!(sql, options)
34 sql << " UNSIGNED" if options[:unsigned]
35 old_add_column_options!(sql, options)
36 sql << " #{options[:options]}"
41 alias_method :old_native_database_types, :native_database_types
43 def native_database_types
44 types = old_native_database_types
45 types[:bigint] = { :name => "bigint", :limit => 20 }
46 types[:double] = { :name => "double" }
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"]
54 unless type == :string or type == :text
55 options.delete(:default) if options[:default] = "";
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)
65 return { :id => false, :force => true, :options => "ENGINE=MyIsam" }
69 return { :id => false, :force => true, :options => "ENGINE=InnoDB" }