663 lines
23 KiB
Ruby
663 lines
23 KiB
Ruby
require 'active_record/connection_adapters/abstract_adapter'
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require 'set'
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module MysqlCompat #:nodoc:
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# add all_hashes method to standard mysql-c bindings or pure ruby version
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def self.define_all_hashes_method!
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raise 'Mysql not loaded' unless defined?(::Mysql)
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target = defined?(Mysql::Result) ? Mysql::Result : MysqlRes
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return if target.instance_methods.include?('all_hashes') ||
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target.instance_methods.include?(:all_hashes)
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# Ruby driver has a version string and returns null values in each_hash
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# C driver >= 2.7 returns null values in each_hash
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if Mysql.const_defined?(:VERSION) && (Mysql::VERSION.is_a?(String) || Mysql::VERSION >= 20700)
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target.class_eval <<-'end_eval'
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def all_hashes # def all_hashes
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rows = [] # rows = []
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each_hash { |row| rows << row } # each_hash { |row| rows << row }
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rows # rows
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end # end
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end_eval
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# adapters before 2.7 don't have a version constant
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# and don't return null values in each_hash
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else
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target.class_eval <<-'end_eval'
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def all_hashes # def all_hashes
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rows = [] # rows = []
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all_fields = fetch_fields.inject({}) { |fields, f| # all_fields = fetch_fields.inject({}) { |fields, f|
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fields[f.name] = nil; fields # fields[f.name] = nil; fields
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} # }
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each_hash { |row| rows << all_fields.dup.update(row) } # each_hash { |row| rows << all_fields.dup.update(row) }
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rows # rows
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end # end
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end_eval
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end
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unless target.instance_methods.include?('all_hashes') ||
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target.instance_methods.include?(:all_hashes)
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raise "Failed to defined #{target.name}#all_hashes method. Mysql::VERSION = #{Mysql::VERSION.inspect}"
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end
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end
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end
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module ActiveRecord
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class Base
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# Establishes a connection to the database that's used by all Active Record objects.
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def self.mysql_connection(config) # :nodoc:
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config = config.symbolize_keys
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host = config[:host]
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port = config[:port]
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socket = config[:socket]
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username = config[:username] ? config[:username].to_s : 'root'
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password = config[:password].to_s
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database = config[:database]
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# Require the MySQL driver and define Mysql::Result.all_hashes
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unless defined? Mysql
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begin
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require_library_or_gem('mysql')
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rescue LoadError
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$stderr.puts '!!! The bundled mysql.rb driver has been removed from Rails 2.2. Please install the mysql gem and try again: gem install mysql.'
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raise
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end
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end
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MysqlCompat.define_all_hashes_method!
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mysql = Mysql.init
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mysql.ssl_set(config[:sslkey], config[:sslcert], config[:sslca], config[:sslcapath], config[:sslcipher]) if config[:sslca] || config[:sslkey]
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default_flags = Mysql.const_defined?(:CLIENT_MULTI_RESULTS) ? Mysql::CLIENT_MULTI_RESULTS : 0
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options = [host, username, password, database, port, socket, default_flags]
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ConnectionAdapters::MysqlAdapter.new(mysql, logger, options, config)
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end
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end
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module ConnectionAdapters
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class MysqlColumn < Column #:nodoc:
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def extract_default(default)
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if sql_type =~ /blob/i || type == :text
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if default.blank?
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return null ? nil : ''
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else
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raise ArgumentError, "#{type} columns cannot have a default value: #{default.inspect}"
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end
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elsif missing_default_forged_as_empty_string?(default)
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nil
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else
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super
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end
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end
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def has_default?
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return false if sql_type =~ /blob/i || type == :text #mysql forbids defaults on blob and text columns
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super
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end
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private
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def simplified_type(field_type)
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return :boolean if MysqlAdapter.emulate_booleans && field_type.downcase.index("tinyint(1)")
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return :string if field_type =~ /enum/i
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super
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end
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def extract_limit(sql_type)
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case sql_type
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when /blob|text/i
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case sql_type
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when /tiny/i
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255
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when /medium/i
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16777215
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when /long/i
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2147483647 # mysql only allows 2^31-1, not 2^32-1, somewhat inconsistently with the tiny/medium/normal cases
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else
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super # we could return 65535 here, but we leave it undecorated by default
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end
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when /^bigint/i; 8
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when /^int/i; 4
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when /^mediumint/i; 3
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when /^smallint/i; 2
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when /^tinyint/i; 1
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else
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super
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end
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end
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# MySQL misreports NOT NULL column default when none is given.
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# We can't detect this for columns which may have a legitimate ''
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# default (string) but we can for others (integer, datetime, boolean,
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# and the rest).
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#
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# Test whether the column has default '', is not null, and is not
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# a type allowing default ''.
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def missing_default_forged_as_empty_string?(default)
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type != :string && !null && default == ''
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end
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end
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# The MySQL adapter will work with both Ruby/MySQL, which is a Ruby-based MySQL adapter that comes bundled with Active Record, and with
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# the faster C-based MySQL/Ruby adapter (available both as a gem and from http://www.tmtm.org/en/mysql/ruby/).
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#
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# Options:
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#
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# * <tt>:host</tt> - Defaults to "localhost".
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# * <tt>:port</tt> - Defaults to 3306.
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# * <tt>:socket</tt> - Defaults to "/tmp/mysql.sock".
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# * <tt>:username</tt> - Defaults to "root"
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# * <tt>:password</tt> - Defaults to nothing.
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# * <tt>:database</tt> - The name of the database. No default, must be provided.
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# * <tt>:encoding</tt> - (Optional) Sets the client encoding by executing "SET NAMES <encoding>" after connection.
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# * <tt>:reconnect</tt> - Defaults to false (See MySQL documentation: http://dev.mysql.com/doc/refman/5.0/en/auto-reconnect.html).
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# * <tt>:sslca</tt> - Necessary to use MySQL with an SSL connection.
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# * <tt>:sslkey</tt> - Necessary to use MySQL with an SSL connection.
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# * <tt>:sslcert</tt> - Necessary to use MySQL with an SSL connection.
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# * <tt>:sslcapath</tt> - Necessary to use MySQL with an SSL connection.
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# * <tt>:sslcipher</tt> - Necessary to use MySQL with an SSL connection.
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#
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class MysqlAdapter < AbstractAdapter
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##
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# :singleton-method:
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# By default, the MysqlAdapter will consider all columns of type <tt>tinyint(1)</tt>
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# as boolean. If you wish to disable this emulation (which was the default
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# behavior in versions 0.13.1 and earlier) you can add the following line
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# to your environment.rb file:
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#
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# ActiveRecord::ConnectionAdapters::MysqlAdapter.emulate_booleans = false
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cattr_accessor :emulate_booleans
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self.emulate_booleans = true
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ADAPTER_NAME = 'MySQL'.freeze
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LOST_CONNECTION_ERROR_MESSAGES = [
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"Server shutdown in progress",
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"Broken pipe",
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"Lost connection to MySQL server during query",
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"MySQL server has gone away" ]
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QUOTED_TRUE, QUOTED_FALSE = '1'.freeze, '0'.freeze
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NATIVE_DATABASE_TYPES = {
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:primary_key => "int(11) DEFAULT NULL auto_increment PRIMARY KEY".freeze,
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:string => { :name => "varchar", :limit => 255 },
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:text => { :name => "text" },
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:integer => { :name => "int", :limit => 4 },
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:float => { :name => "float" },
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:decimal => { :name => "decimal" },
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:datetime => { :name => "datetime" },
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:timestamp => { :name => "datetime" },
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:time => { :name => "time" },
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:date => { :name => "date" },
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:binary => { :name => "blob" },
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:boolean => { :name => "tinyint", :limit => 1 }
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}
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def initialize(connection, logger, connection_options, config)
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super(connection, logger)
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@connection_options, @config = connection_options, config
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@quoted_column_names, @quoted_table_names = {}, {}
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connect
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end
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def adapter_name #:nodoc:
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ADAPTER_NAME
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end
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def supports_migrations? #:nodoc:
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true
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end
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def supports_primary_key? #:nodoc:
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true
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end
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def supports_savepoints? #:nodoc:
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true
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end
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def native_database_types #:nodoc:
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NATIVE_DATABASE_TYPES
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end
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# QUOTING ==================================================
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def quote(value, column = nil)
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if value.kind_of?(String) && column && column.type == :binary && column.class.respond_to?(:string_to_binary)
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s = column.class.string_to_binary(value).unpack("H*")[0]
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"x'#{s}'"
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elsif value.kind_of?(BigDecimal)
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value.to_s("F")
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else
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super
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end
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end
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def quote_column_name(name) #:nodoc:
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@quoted_column_names[name] ||= "`#{name.to_s.gsub('`', '``')}`"
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end
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def quote_table_name(name) #:nodoc:
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@quoted_table_names[name] ||= quote_column_name(name).gsub('.', '`.`')
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end
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def quote_string(string) #:nodoc:
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@connection.quote(string)
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end
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def quoted_true
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QUOTED_TRUE
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end
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def quoted_false
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QUOTED_FALSE
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end
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# REFERENTIAL INTEGRITY ====================================
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def disable_referential_integrity(&block) #:nodoc:
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old = select_value("SELECT @@FOREIGN_KEY_CHECKS")
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begin
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update("SET FOREIGN_KEY_CHECKS = 0")
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yield
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ensure
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update("SET FOREIGN_KEY_CHECKS = #{old}")
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end
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end
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# CONNECTION MANAGEMENT ====================================
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def active?
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if @connection.respond_to?(:stat)
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@connection.stat
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else
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@connection.query 'select 1'
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end
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# mysql-ruby doesn't raise an exception when stat fails.
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if @connection.respond_to?(:errno)
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@connection.errno.zero?
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else
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true
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end
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rescue Mysql::Error
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false
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end
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def reconnect!
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disconnect!
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connect
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end
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def disconnect!
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@connection.close rescue nil
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end
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def reset!
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if @connection.respond_to?(:change_user)
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# See http://bugs.mysql.com/bug.php?id=33540 -- the workaround way to
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# reset the connection is to change the user to the same user.
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@connection.change_user(@config[:username], @config[:password], @config[:database])
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configure_connection
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end
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end
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# DATABASE STATEMENTS ======================================
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def select_rows(sql, name = nil)
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@connection.query_with_result = true
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result = execute(sql, name)
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rows = []
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result.each { |row| rows << row }
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result.free
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@connection.more_results && @connection.next_result # invoking stored procedures with CLIENT_MULTI_RESULTS requires this to tidy up else connection will be dropped
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rows
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end
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# Executes a SQL query and returns a MySQL::Result object. Note that you have to free the Result object after you're done using it.
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def execute(sql, name = nil) #:nodoc:
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log(sql, name) { @connection.query(sql) }
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rescue ActiveRecord::StatementInvalid => exception
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if exception.message.split(":").first =~ /Packets out of order/
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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."
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else
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raise
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end
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end
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def insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) #:nodoc:
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super sql, name
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id_value || @connection.insert_id
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end
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def update_sql(sql, name = nil) #:nodoc:
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super
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@connection.affected_rows
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end
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def begin_db_transaction #:nodoc:
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execute "BEGIN"
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rescue Exception
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# Transactions aren't supported
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end
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def commit_db_transaction #:nodoc:
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execute "COMMIT"
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rescue Exception
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# Transactions aren't supported
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end
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def rollback_db_transaction #:nodoc:
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execute "ROLLBACK"
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rescue Exception
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# Transactions aren't supported
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end
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def create_savepoint
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execute("SAVEPOINT #{current_savepoint_name}")
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end
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def rollback_to_savepoint
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execute("ROLLBACK TO SAVEPOINT #{current_savepoint_name}")
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end
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def release_savepoint
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execute("RELEASE SAVEPOINT #{current_savepoint_name}")
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end
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def add_limit_offset!(sql, options) #:nodoc:
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if limit = options[:limit]
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limit = sanitize_limit(limit)
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unless offset = options[:offset]
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sql << " LIMIT #{limit}"
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else
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sql << " LIMIT #{offset.to_i}, #{limit}"
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end
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end
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end
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# SCHEMA STATEMENTS ========================================
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def structure_dump #:nodoc:
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if supports_views?
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sql = "SHOW FULL TABLES WHERE Table_type = 'BASE TABLE'"
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else
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sql = "SHOW TABLES"
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end
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select_all(sql).inject("") do |structure, table|
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table.delete('Table_type')
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structure += select_one("SHOW CREATE TABLE #{quote_table_name(table.to_a.first.last)}")["Create Table"] + ";\n\n"
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end
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end
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def recreate_database(name, options = {}) #:nodoc:
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drop_database(name)
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create_database(name, options)
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end
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# Create a new MySQL database with optional <tt>:charset</tt> and <tt>:collation</tt>.
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# Charset defaults to utf8.
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#
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# Example:
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# create_database 'charset_test', :charset => 'latin1', :collation => 'latin1_bin'
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# create_database 'matt_development'
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# create_database 'matt_development', :charset => :big5
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def create_database(name, options = {})
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if options[:collation]
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execute "CREATE DATABASE `#{name}` DEFAULT CHARACTER SET `#{options[:charset] || 'utf8'}` COLLATE `#{options[:collation]}`"
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else
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execute "CREATE DATABASE `#{name}` DEFAULT CHARACTER SET `#{options[:charset] || 'utf8'}`"
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end
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end
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def drop_database(name) #:nodoc:
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execute "DROP DATABASE IF EXISTS `#{name}`"
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end
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def current_database
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select_value 'SELECT DATABASE() as db'
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end
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# Returns the database character set.
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def charset
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show_variable 'character_set_database'
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end
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# Returns the database collation strategy.
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def collation
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show_variable 'collation_database'
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end
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def tables(name = nil) #:nodoc:
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tables = []
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result = execute("SHOW TABLES", name)
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result.each { |field| tables << field[0] }
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result.free
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tables
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end
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def drop_table(table_name, options = {})
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super(table_name, options)
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end
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def indexes(table_name, name = nil)#:nodoc:
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indexes = []
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current_index = nil
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result = execute("SHOW KEYS FROM #{quote_table_name(table_name)}", name)
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result.each do |row|
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if current_index != row[2]
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next if row[2] == "PRIMARY" # skip the primary key
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current_index = row[2]
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indexes << IndexDefinition.new(row[0], row[2], row[1] == "0", [], [])
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end
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indexes.last.columns << row[4]
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indexes.last.lengths << row[7]
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end
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result.free
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indexes
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end
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def columns(table_name, name = nil)#:nodoc:
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sql = "SHOW FIELDS FROM #{quote_table_name(table_name)}"
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columns = []
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result = execute(sql, name)
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result.each { |field| columns << MysqlColumn.new(field[0], field[4], field[1], field[2] == "YES") }
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result.free
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columns
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end
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def create_table(table_name, options = {}) #:nodoc:
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super(table_name, options.reverse_merge(:options => "ENGINE=InnoDB"))
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end
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def rename_table(table_name, new_name)
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execute "RENAME TABLE #{quote_table_name(table_name)} TO #{quote_table_name(new_name)}"
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end
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def add_column(table_name, column_name, type, options = {})
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add_column_sql = "ALTER TABLE #{quote_table_name(table_name)} ADD #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}"
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add_column_options!(add_column_sql, options)
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add_column_position!(add_column_sql, options)
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execute(add_column_sql)
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end
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def change_column_default(table_name, column_name, default) #:nodoc:
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column = column_for(table_name, column_name)
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change_column table_name, column_name, column.sql_type, :default => default
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end
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def change_column_null(table_name, column_name, null, default = nil)
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column = column_for(table_name, column_name)
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unless null || default.nil?
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execute("UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote(default)} WHERE #{quote_column_name(column_name)} IS NULL")
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end
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change_column table_name, column_name, column.sql_type, :null => null
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end
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def change_column(table_name, column_name, type, options = {}) #:nodoc:
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column = column_for(table_name, column_name)
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unless options_include_default?(options)
|
|
options[:default] = column.default
|
|
end
|
|
|
|
unless options.has_key?(:null)
|
|
options[:null] = column.null
|
|
end
|
|
|
|
change_column_sql = "ALTER TABLE #{quote_table_name(table_name)} CHANGE #{quote_column_name(column_name)} #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}"
|
|
add_column_options!(change_column_sql, options)
|
|
add_column_position!(change_column_sql, options)
|
|
execute(change_column_sql)
|
|
end
|
|
|
|
def rename_column(table_name, column_name, new_column_name) #:nodoc:
|
|
options = {}
|
|
if column = columns(table_name).find { |c| c.name == column_name.to_s }
|
|
options[:default] = column.default
|
|
options[:null] = column.null
|
|
else
|
|
raise ActiveRecordError, "No such column: #{table_name}.#{column_name}"
|
|
end
|
|
current_type = select_one("SHOW COLUMNS FROM #{quote_table_name(table_name)} LIKE '#{column_name}'")["Type"]
|
|
rename_column_sql = "ALTER TABLE #{quote_table_name(table_name)} CHANGE #{quote_column_name(column_name)} #{quote_column_name(new_column_name)} #{current_type}"
|
|
add_column_options!(rename_column_sql, options)
|
|
execute(rename_column_sql)
|
|
end
|
|
|
|
# Maps logical Rails types to MySQL-specific data types.
|
|
def type_to_sql(type, limit = nil, precision = nil, scale = nil)
|
|
return super unless type.to_s == 'integer'
|
|
|
|
case limit
|
|
when 1; 'tinyint'
|
|
when 2; 'smallint'
|
|
when 3; 'mediumint'
|
|
when nil, 4, 11; 'int(11)' # compatibility with MySQL default
|
|
when 5..8; 'bigint'
|
|
else raise(ActiveRecordError, "No integer type has byte size #{limit}")
|
|
end
|
|
end
|
|
|
|
def add_column_position!(sql, options)
|
|
if options[:first]
|
|
sql << " FIRST"
|
|
elsif options[:after]
|
|
sql << " AFTER #{quote_column_name(options[:after])}"
|
|
end
|
|
end
|
|
|
|
# SHOW VARIABLES LIKE 'name'
|
|
def show_variable(name)
|
|
variables = select_all("SHOW VARIABLES LIKE '#{name}'")
|
|
variables.first['Value'] unless variables.empty?
|
|
end
|
|
|
|
# Returns a table's primary key and belonging sequence.
|
|
def pk_and_sequence_for(table) #:nodoc:
|
|
keys = []
|
|
result = execute("describe #{quote_table_name(table)}")
|
|
result.each_hash do |h|
|
|
keys << h["Field"]if h["Key"] == "PRI"
|
|
end
|
|
result.free
|
|
keys.length == 1 ? [keys.first, nil] : nil
|
|
end
|
|
|
|
# Returns just a table's primary key
|
|
def primary_key(table)
|
|
pk_and_sequence = pk_and_sequence_for(table)
|
|
pk_and_sequence && pk_and_sequence.first
|
|
end
|
|
|
|
def case_sensitive_equality_operator
|
|
"= BINARY"
|
|
end
|
|
|
|
def limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key)
|
|
where_sql
|
|
end
|
|
|
|
protected
|
|
def quoted_columns_for_index(column_names, options = {})
|
|
length = options[:length] if options.is_a?(Hash)
|
|
|
|
quoted_column_names = case length
|
|
when Hash
|
|
column_names.map {|name| length[name] ? "#{quote_column_name(name)}(#{length[name]})" : quote_column_name(name) }
|
|
when Fixnum
|
|
column_names.map {|name| "#{quote_column_name(name)}(#{length})"}
|
|
else
|
|
column_names.map {|name| quote_column_name(name) }
|
|
end
|
|
end
|
|
|
|
private
|
|
def connect
|
|
encoding = @config[:encoding]
|
|
if encoding
|
|
@connection.options(Mysql::SET_CHARSET_NAME, encoding) rescue nil
|
|
end
|
|
|
|
if @config[:sslca] || @config[:sslkey]
|
|
@connection.ssl_set(@config[:sslkey], @config[:sslcert], @config[:sslca], @config[:sslcapath], @config[:sslcipher])
|
|
end
|
|
|
|
@connection.options(Mysql::OPT_CONNECT_TIMEOUT, @config[:connect_timeout]) if @config[:connect_timeout]
|
|
@connection.options(Mysql::OPT_READ_TIMEOUT, @config[:read_timeout]) if @config[:read_timeout]
|
|
@connection.options(Mysql::OPT_WRITE_TIMEOUT, @config[:write_timeout]) if @config[:write_timeout]
|
|
|
|
@connection.real_connect(*@connection_options)
|
|
|
|
# reconnect must be set after real_connect is called, because real_connect sets it to false internally
|
|
@connection.reconnect = !!@config[:reconnect] if @connection.respond_to?(:reconnect=)
|
|
|
|
configure_connection
|
|
end
|
|
|
|
def configure_connection
|
|
encoding = @config[:encoding]
|
|
execute("SET NAMES '#{encoding}'") if encoding
|
|
|
|
# By default, MySQL 'where id is null' selects the last inserted id.
|
|
# Turn this off. http://dev.rubyonrails.org/ticket/6778
|
|
execute("SET SQL_AUTO_IS_NULL=0")
|
|
end
|
|
|
|
def select(sql, name = nil)
|
|
@connection.query_with_result = true
|
|
result = execute(sql, name)
|
|
rows = result.all_hashes
|
|
result.free
|
|
@connection.more_results && @connection.next_result # invoking stored procedures with CLIENT_MULTI_RESULTS requires this to tidy up else connection will be dropped
|
|
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
|
|
|
|
def column_for(table_name, column_name)
|
|
unless column = columns(table_name).find { |c| c.name == column_name.to_s }
|
|
raise "No such column: #{table_name}.#{column_name}"
|
|
end
|
|
column
|
|
end
|
|
end
|
|
end
|
|
end
|