require 'active_record/connection_adapters/abstract_adapter' module ActiveRecord class Base # Establishes a connection to the database that's used by all Active Record objects. def self.mysql_connection(config) # :nodoc: # Only include the MySQL driver if one hasn't already been loaded unless defined? Mysql begin require_library_or_gem 'mysql' rescue LoadError => cannot_require_mysql # Only use the supplied backup Ruby/MySQL driver if no driver is already in place begin require 'active_record/vendor/mysql' rescue LoadError raise cannot_require_mysql end end end config = config.symbolize_keys host = config[:host] port = config[:port] socket = config[:socket] username = config[:username] ? config[:username].to_s : 'root' password = config[:password].to_s if config.has_key?(:database) database = config[:database] else raise ArgumentError, "No database specified. Missing argument: database." end mysql = Mysql.init mysql.ssl_set(config[:sslkey], config[:sslcert], config[:sslca], config[:sslcapath], config[:sslcipher]) if config[:sslkey] ConnectionAdapters::MysqlAdapter.new(mysql, logger, [host, username, password, database, port, socket], config) end end module ConnectionAdapters class MysqlColumn < Column #:nodoc: private def simplified_type(field_type) return :boolean if MysqlAdapter.emulate_booleans && field_type.downcase.index("tinyint(1)") return :string if field_type =~ /enum/i super end end # The MySQL adapter will work with both Ruby/MySQL, which is a Ruby-based MySQL adapter that comes bundled with Active Record, and with # the faster C-based MySQL/Ruby adapter (available both as a gem and from http://www.tmtm.org/en/mysql/ruby/). # # Options: # # * :host -- Defaults to localhost # * :port -- Defaults to 3306 # * :socket -- Defaults to /tmp/mysql.sock # * :username -- Defaults to root # * :password -- Defaults to nothing # * :database -- The name of the database. No default, must be provided. # * :sslkey -- Necessary to use MySQL with an SSL connection # * :sslcert -- Necessary to use MySQL with an SSL connection # * :sslcapath -- Necessary to use MySQL with an SSL connection # * :sslcipher -- Necessary to use MySQL with an SSL connection # # By default, the MysqlAdapter will consider all columns of type tinyint(1) # as boolean. If you wish to disable this emulation (which was the default # behavior in versions 0.13.1 and earlier) you can add the following line # to your environment.rb file: # # ActiveRecord::ConnectionAdapters::MysqlAdapter.emulate_booleans = false class MysqlAdapter < AbstractAdapter @@emulate_booleans = true cattr_accessor :emulate_booleans LOST_CONNECTION_ERROR_MESSAGES = [ "Server shutdown in progress", "Broken pipe", "Lost connection to MySQL server during query", "MySQL server has gone away" ] def initialize(connection, logger, connection_options, config) super(connection, logger) @connection_options, @config = connection_options, config @null_values_in_each_hash = Mysql.const_defined?(:VERSION) connect end def adapter_name #:nodoc: 'MySQL' end def supports_migrations? #:nodoc: true end def native_database_types #:nodoc { :primary_key => "int(11) DEFAULT NULL auto_increment PRIMARY KEY", :string => { :name => "varchar", :limit => 255 }, :text => { :name => "text" }, :integer => { :name => "int", :limit => 11 }, :float => { :name => "float" }, :datetime => { :name => "datetime" }, :timestamp => { :name => "datetime" }, :time => { :name => "time" }, :date => { :name => "date" }, :binary => { :name => "blob" }, :boolean => { :name => "tinyint", :limit => 1 } } end # QUOTING ================================================== def quote(value, column = nil) if value.kind_of?(String) && column && column.type == :binary && column.class.respond_to?(:string_to_binary) s = column.class.string_to_binary(value).unpack("H*")[0] "x'#{s}'" else super end end def quote_column_name(name) #:nodoc: "`#{name}`" end def quote_string(string) #:nodoc: @connection.quote(string) end def quoted_true "1" end def quoted_false "0" end # CONNECTION MANAGEMENT ==================================== def active? if @connection.respond_to?(:stat) @connection.stat else @connection.query 'select 1' end # mysql-ruby doesn't raise an exception when stat fails. if @connection.respond_to?(:errno) @connection.errno.zero? else true end rescue Mysql::Error false end def reconnect! disconnect! connect end def disconnect! @connection.close rescue nil end # DATABASE STATEMENTS ====================================== def select_all(sql, name = nil) #:nodoc: select(sql, name) end def select_one(sql, name = nil) #:nodoc: result = select(sql, name) result.nil? ? nil : result.first end def execute(sql, name = nil, retries = 2) #:nodoc: log(sql, name) { @connection.query(sql) } rescue ActiveRecord::StatementInvalid => exception if exception.message.split(":").first =~ /Packets out of order/ raise ActiveRecord::StatementInvalid, "'Packets out of order' error was received from the database. Please update your mysql bindings (gem install mysql) and read http://dev.mysql.com/doc/mysql/en/password-hashing.html for more information. If you're on Windows, use the Instant Rails installer to get the updated mysql bindings." else raise end end def insert(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) #:nodoc: execute(sql, name = nil) id_value || @connection.insert_id end def update(sql, name = nil) #:nodoc: execute(sql, name) @connection.affected_rows end alias_method :delete, :update #:nodoc: def begin_db_transaction #:nodoc: execute "BEGIN" rescue Exception # Transactions aren't supported end def commit_db_transaction #:nodoc: execute "COMMIT" rescue Exception # Transactions aren't supported end def rollback_db_transaction #:nodoc: execute "ROLLBACK" rescue Exception # Transactions aren't supported end def add_limit_offset!(sql, options) #:nodoc if limit = options[:limit] unless offset = options[:offset] sql << " LIMIT #{limit}" else sql << " LIMIT #{offset}, #{limit}" end end end # SCHEMA STATEMENTS ======================================== def structure_dump #:nodoc: if supports_views? sql = "SHOW FULL TABLES WHERE Table_type = 'BASE TABLE'" else sql = "SHOW TABLES" end select_all(sql).inject("") do |structure, table| table.delete('Table_type') structure += select_one("SHOW CREATE TABLE #{table.to_a.first.last}")["Create Table"] + ";\n\n" end end def recreate_database(name) #:nodoc: drop_database(name) create_database(name) end def create_database(name) #:nodoc: execute "CREATE DATABASE `#{name}`" end def drop_database(name) #:nodoc: execute "DROP DATABASE IF EXISTS `#{name}`" end def current_database select_one("SELECT DATABASE() as db")["db"] end def tables(name = nil) #:nodoc: tables = [] execute("SHOW TABLES", name).each { |field| tables << field[0] } tables end def indexes(table_name, name = nil)#:nodoc: indexes = [] current_index = nil execute("SHOW KEYS FROM #{table_name}", name).each do |row| if current_index != row[2] next if row[2] == "PRIMARY" # skip the primary key current_index = row[2] indexes << IndexDefinition.new(row[0], row[2], row[1] == "0", []) end indexes.last.columns << row[4] end indexes end def columns(table_name, name = nil)#:nodoc: sql = "SHOW FIELDS FROM #{table_name}" columns = [] execute(sql, name).each { |field| columns << MysqlColumn.new(field[0], field[4], field[1], field[2] == "YES") } columns end def create_table(name, options = {}) #:nodoc: super(name, {:options => "ENGINE=InnoDB"}.merge(options)) end def rename_table(name, new_name) execute "RENAME TABLE #{name} TO #{new_name}" end def change_column_default(table_name, column_name, default) #:nodoc: current_type = select_one("SHOW COLUMNS FROM #{table_name} LIKE '#{column_name}'")["Type"] change_column(table_name, column_name, current_type, { :default => default }) end def change_column(table_name, column_name, type, options = {}) #:nodoc: options[:default] ||= select_one("SHOW COLUMNS FROM #{table_name} LIKE '#{column_name}'")["Default"] change_column_sql = "ALTER TABLE #{table_name} CHANGE #{column_name} #{column_name} #{type_to_sql(type, options[:limit])}" add_column_options!(change_column_sql, options) execute(change_column_sql) end def rename_column(table_name, column_name, new_column_name) #:nodoc: current_type = select_one("SHOW COLUMNS FROM #{table_name} LIKE '#{column_name}'")["Type"] execute "ALTER TABLE #{table_name} CHANGE #{column_name} #{new_column_name} #{current_type}" end private def connect encoding = @config[:encoding] if encoding @connection.options(Mysql::SET_CHARSET_NAME, encoding) rescue nil end @connection.real_connect(*@connection_options) execute("SET NAMES '#{encoding}'") if encoding end def select(sql, name = nil) @connection.query_with_result = true result = execute(sql, name) rows = [] if @null_values_in_each_hash result.each_hash { |row| rows << row } else all_fields = result.fetch_fields.inject({}) { |fields, f| fields[f.name] = nil; fields } result.each_hash { |row| rows << all_fields.dup.update(row) } end result.free rows end def supports_views? version[0] >= 5 end def version @version ||= @connection.server_info.scan(/^(\d+)\.(\d+)\.(\d+)/).flatten.map { |v| v.to_i } end end end end