add AR mysql2 adatper back
This commit is contained in:
Brian Lopez
parent
164ad07332
commit
95fb97dc2b
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@ -0,0 +1,639 @@
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# encoding: utf-8
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require 'mysql2' unless defined? Mysql2
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module ActiveRecord
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class Base
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def self.mysql2_connection(config)
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config[:username] = 'root' if config[:username].nil?
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client = Mysql2::Client.new(config.symbolize_keys)
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options = [config[:host], config[:username], config[:password], config[:database], config[:port], config[:socket], 0]
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ConnectionAdapters::Mysql2Adapter.new(client, logger, options, config)
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end
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end
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module ConnectionAdapters
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class Mysql2Column < Column
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BOOL = "tinyint(1)"
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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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# Returns the Ruby class that corresponds to the abstract data type.
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def klass
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case type
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when :integer then Fixnum
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when :float then Float
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when :decimal then BigDecimal
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when :datetime then Time
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when :date then Date
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when :timestamp then Time
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when :time then Time
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when :text, :string then String
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when :binary then String
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when :boolean then Object
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end
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end
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def type_cast(value)
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return nil if value.nil?
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case type
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when :string then value
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when :text then value
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when :integer then value.to_i rescue value ? 1 : 0
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when :float then value.to_f # returns self if it's already a Float
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when :decimal then self.class.value_to_decimal(value)
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when :datetime, :timestamp then value.class == Time ? value : self.class.string_to_time(value)
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when :time then value.class == Time ? value : self.class.string_to_dummy_time(value)
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when :date then value.class == Date ? value : self.class.string_to_date(value)
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when :binary then value
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when :boolean then self.class.value_to_boolean(value)
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else value
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end
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end
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def type_cast_code(var_name)
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case type
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when :string then nil
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when :text then nil
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when :integer then "#{var_name}.to_i rescue #{var_name} ? 1 : 0"
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when :float then "#{var_name}.to_f"
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when :decimal then "#{self.class.name}.value_to_decimal(#{var_name})"
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when :datetime, :timestamp then "#{var_name}.class == Time ? #{var_name} : #{self.class.name}.string_to_time(#{var_name})"
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when :time then "#{var_name}.class == Time ? #{var_name} : #{self.class.name}.string_to_dummy_time(#{var_name})"
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when :date then "#{var_name}.class == Date ? #{var_name} : #{self.class.name}.string_to_date(#{var_name})"
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when :binary then nil
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when :boolean then "#{self.class.name}.value_to_boolean(#{var_name})"
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else nil
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end
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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 Mysql2Adapter.emulate_booleans && field_type.downcase.index(BOOL)
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return :string if field_type =~ /enum/i or field_type =~ /set/i
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return :integer if field_type =~ /year/i
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return :binary if field_type =~ /bit/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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class Mysql2Adapter < AbstractAdapter
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cattr_accessor :emulate_booleans
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self.emulate_booleans = true
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ADAPTER_NAME = 'Mysql2'
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PRIMARY = "PRIMARY"
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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', '0'
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NATIVE_DATABASE_TYPES = {
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:primary_key => "int(11) DEFAULT NULL auto_increment PRIMARY KEY",
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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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configure_connection
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end
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def adapter_name
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ADAPTER_NAME
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end
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def supports_migrations?
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true
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end
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def supports_primary_key?
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true
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end
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def supports_savepoints?
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true
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end
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def native_database_types
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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}`"
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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)
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@connection.escape(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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return false unless @connection
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@connection.query 'select 1'
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true
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rescue Mysql2::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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# this is set to true in 2.3, but we don't want it to be
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def requires_reloading?
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false
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end
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def disconnect!
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unless @connection.nil?
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@connection.close
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@connection = nil
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end
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end
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def reset!
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disconnect!
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connect
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end
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# DATABASE STATEMENTS ======================================
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# FIXME: re-enable the following once a "better" query_cache solution is in core
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#
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# The overrides below perform much better than the originals in AbstractAdapter
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# because we're able to take advantage of mysql2's lazy-loading capabilities
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#
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# # Returns a record hash with the column names as keys and column values
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# # as values.
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# def select_one(sql, name = nil)
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# result = execute(sql, name)
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# result.each(:as => :hash) do |r|
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# return r
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# end
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# end
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#
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# # Returns a single value from a record
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# def select_value(sql, name = nil)
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# result = execute(sql, name)
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# if first = result.first
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# first.first
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# end
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# end
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#
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# # Returns an array of the values of the first column in a select:
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# # select_values("SELECT id FROM companies LIMIT 3") => [1,2,3]
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# def select_values(sql, name = nil)
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# execute(sql, name).map { |row| row.first }
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# end
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# Returns an array of arrays containing the field values.
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# Order is the same as that returned by +columns+.
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def select_rows(sql, name = nil)
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execute(sql, name).to_a
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end
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# Executes the SQL statement in the context of this connection.
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def execute(sql, name = nil)
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# make sure we carry over any changes to ActiveRecord::Base.default_timezone that have been
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# made since we established the connection
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@connection.query_options[:database_timezone] = ActiveRecord::Base.default_timezone
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if name == :skip_logging
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@connection.query(sql)
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else
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log(sql, name) { @connection.query(sql) }
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end
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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)
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super
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id_value || @connection.last_id
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end
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alias :create :insert_sql
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def update_sql(sql, name = nil)
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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
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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
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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
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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)
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limit, offset = options[:limit], options[:offset]
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if limit && offset
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sql << " LIMIT #{offset.to_i}, #{sanitize_limit(limit)}"
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elsif limit
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sql << " LIMIT #{sanitize_limit(limit)}"
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elsif offset
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sql << " OFFSET #{offset.to_i}"
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end
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sql
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end
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# SCHEMA STATEMENTS ========================================
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def structure_dump
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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 = {})
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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)
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tables = []
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execute("SHOW TABLES", name).each do |field|
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tables << field.first
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end
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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)
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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(:symbolize_keys => true, :as => :hash) do |row|
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if current_index != row[:Key_name]
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next if row[:Key_name] == PRIMARY # skip the primary key
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current_index = row[:Key_name]
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indexes << IndexDefinition.new(row[:Table], row[:Key_name], row[:Non_unique] == 0, [])
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end
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indexes.last.columns << row[:Column_name]
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end
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indexes
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end
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def columns(table_name, name = nil)
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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, :skip_logging)
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result.each(:symbolize_keys => true, :as => :hash) { |field|
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columns << Mysql2Column.new(field[:Field], field[:Default], field[:Type], field[:Null] == "YES")
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}
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columns
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end
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def create_table(table_name, options = {})
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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)
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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 = {})
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column = column_for(table_name, column_name)
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unless options_include_default?(options)
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options[:default] = column.default
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end
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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)
|
||||
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
|
||||
|
||||
def show_variable(name)
|
||||
variables = select_all("SHOW VARIABLES LIKE '#{name}'")
|
||||
variables.first['Value'] unless variables.empty?
|
||||
end
|
||||
|
||||
def pk_and_sequence_for(table)
|
||||
keys = []
|
||||
result = execute("describe #{quote_table_name(table)}")
|
||||
result.each(:symbolize_keys => true, :as => :hash) do |row|
|
||||
keys << row[:Field] if row[:Key] == "PRI"
|
||||
end
|
||||
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
|
||||
|
||||
def translate_exception(exception, message)
|
||||
return super unless exception.respond_to?(:error_number)
|
||||
|
||||
case exception.error_number
|
||||
when 1062
|
||||
RecordNotUnique.new(message, exception)
|
||||
when 1452
|
||||
InvalidForeignKey.new(message, exception)
|
||||
else
|
||||
super
|
||||
end
|
||||
end
|
||||
|
||||
private
|
||||
def connect
|
||||
@connection = Mysql2::Client.new(@config)
|
||||
configure_connection
|
||||
end
|
||||
|
||||
def configure_connection
|
||||
@connection.query_options.merge!(:as => :array)
|
||||
encoding = @config[:encoding]
|
||||
execute("SET NAMES '#{encoding}'", :skip_logging) 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", :skip_logging)
|
||||
end
|
||||
|
||||
# Returns an array of record hashes with the column names as keys and
|
||||
# column values as values.
|
||||
def select(sql, name = nil)
|
||||
execute(sql, name).each(:as => :hash)
|
||||
end
|
||||
|
||||
def supports_views?
|
||||
version[0] >= 5
|
||||
end
|
||||
|
||||
def version
|
||||
@version ||= @connection.info[:version].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
|
||||
Loading…
Reference in New Issue