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# encoding: utf-8
gem 'mysql2', '~> 0.3.4'
require 'mysql2'
module ActiveRecord
class Base
# Establishes a connection to the database that's used by all Active Record objects.
def self.mysql2_connection(config)
config[:username] = 'root' if config[:username].nil?
if Mysql2::Client.const_defined? :FOUND_ROWS
config[:flags] = Mysql2::Client::FOUND_ROWS
end
client = Mysql2::Client.new(config.symbolize_keys)
options = [config[:host], config[:username], config[:password], config[:database], config[:port], config[:socket], 0]
ConnectionAdapters::Mysql2Adapter.new(client, logger, options, config)
end
end
module ConnectionAdapters
class Mysql2IndexDefinition < Struct.new(:table, :name, :unique, :columns, :lengths) #:nodoc:
end
class Mysql2Column < Column
BOOL = "tinyint(1)"
def extract_default(default)
if sql_type =~ /blob/i || type == :text
if default.blank?
return null ? nil : ''
else
raise ArgumentError, "#{type} columns cannot have a default value: #{default.inspect}"
end
elsif missing_default_forged_as_empty_string?(default)
nil
else
super
end
end
def has_default?
return false if sql_type =~ /blob/i || type == :text #mysql forbids defaults on blob and text columns
super
end
private
def simplified_type(field_type)
return :boolean if Mysql2Adapter.emulate_booleans && field_type.downcase.index(BOOL)
case field_type
when /enum/i, /set/i then :string
when /year/i then :integer
when /bit/i then :binary
else
super
end
end
def extract_limit(sql_type)
case sql_type
when /blob|text/i
case sql_type
when /tiny/i
255
when /medium/i
16777215
when /long/i
2147483647 # mysql only allows 2^31-1, not 2^32-1, somewhat inconsistently with the tiny/medium/normal cases
else
super # we could return 65535 here, but we leave it undecorated by default
end
when /^bigint/i; 8
when /^int/i; 4
when /^mediumint/i; 3
when /^smallint/i; 2
when /^tinyint/i; 1
else
super
end
end
# MySQL misreports NOT NULL column default when none is given.
# We can't detect this for columns which may have a legitimate ''
# default (string) but we can for others (integer, datetime, boolean,
# and the rest).
#
# Test whether the column has default '', is not null, and is not
# a type allowing default ''.
def missing_default_forged_as_empty_string?(default)
type != :string && !null && default == ''
end
end
class Mysql2Adapter < AbstractAdapter
cattr_accessor :emulate_booleans
self.emulate_booleans = true
ADAPTER_NAME = 'Mysql2'
PRIMARY = "PRIMARY"
LOST_CONNECTION_ERROR_MESSAGES = [
"Server shutdown in progress",
"Broken pipe",
"Lost connection to MySQL server during query",
"MySQL server has gone away" ]
QUOTED_TRUE, QUOTED_FALSE = '1', '0'
NATIVE_DATABASE_TYPES = {
:primary_key => "int(11) DEFAULT NULL auto_increment PRIMARY KEY",
:string => { :name => "varchar", :limit => 255 },
:text => { :name => "text" },
:integer => { :name => "int", :limit => 4 },
:float => { :name => "float" },
:decimal => { :name => "decimal" },
:datetime => { :name => "datetime" },
:timestamp => { :name => "datetime" },
:time => { :name => "time" },
:date => { :name => "date" },
:binary => { :name => "blob" },
:boolean => { :name => "tinyint", :limit => 1 }
}
def initialize(connection, logger, connection_options, config)
super(connection, logger)
@connection_options, @config = connection_options, config
@quoted_column_names, @quoted_table_names = {}, {}
configure_connection
end
def adapter_name
ADAPTER_NAME
end
# Returns true, since this connection adapter supports migrations.
def supports_migrations?
true
end
def supports_primary_key?
true
end
# Returns true, since this connection adapter supports savepoints.
def supports_savepoints?
true
end
def native_database_types
NATIVE_DATABASE_TYPES
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}'"
elsif value.kind_of?(BigDecimal)
value.to_s("F")
else
super
end
end
def quote_column_name(name) #:nodoc:
@quoted_column_names[name] ||= "`#{name}`"
end
def quote_table_name(name) #:nodoc:
@quoted_table_names[name] ||= quote_column_name(name).gsub('.', '`.`')
end
def quote_string(string)
@connection.escape(string)
end
def quoted_true
QUOTED_TRUE
end
def quoted_false
QUOTED_FALSE
end
def substitute_at(column, index)
Arel.sql "\0"
end
# REFERENTIAL INTEGRITY ====================================
def disable_referential_integrity(&block) #:nodoc:
old = select_value("SELECT @@FOREIGN_KEY_CHECKS")
begin
update("SET FOREIGN_KEY_CHECKS = 0")
yield
ensure
update("SET FOREIGN_KEY_CHECKS = #{old}")
end
end
# CONNECTION MANAGEMENT ====================================
def active?
return false unless @connection
@connection.ping
end
def reconnect!
disconnect!
connect
end
# this is set to true in 2.3, but we don't want it to be
def requires_reloading?
false
end
# Disconnects from the database if already connected.
# Otherwise, this method does nothing.
def disconnect!
unless @connection.nil?
@connection.close
@connection = nil
end
end
def reset!
disconnect!
connect
end
# DATABASE STATEMENTS ======================================
# FIXME: re-enable the following once a "better" query_cache solution is in core
#
# The overrides below perform much better than the originals in AbstractAdapter
# because we're able to take advantage of mysql2's lazy-loading capabilities
#
# # Returns a record hash with the column names as keys and column values
# # as values.
# def select_one(sql, name = nil)
# result = execute(sql, name)
# result.each(:as => :hash) do |r|
# return r
# end
# end
#
# # Returns a single value from a record
# def select_value(sql, name = nil)
# result = execute(sql, name)
# if first = result.first
# first.first
# end
# end
#
# # Returns an array of the values of the first column in a select:
# # select_values("SELECT id FROM companies LIMIT 3") => [1,2,3]
# def select_values(sql, name = nil)
# execute(sql, name).map { |row| row.first }
# end
# Returns an array of arrays containing the field values.
# Order is the same as that returned by +columns+.
def select_rows(sql, name = nil)
execute(sql, name).to_a
end
# Executes the SQL statement in the context of this connection.
def execute(sql, name = nil)
# make sure we carry over any changes to ActiveRecord::Base.default_timezone that have been
# made since we established the connection
@connection.query_options[:database_timezone] = ActiveRecord::Base.default_timezone
if name == :skip_logging
@connection.query(sql)
else
log(sql, name) { @connection.query(sql) }
end
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(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)
super
id_value || @connection.last_id
end
alias :create :insert_sql
def exec_insert(sql, name, binds)
binds = binds.dup
# Pretend to support bind parameters
execute sql.gsub("\0") { quote(*binds.shift.reverse) }, name
end
def exec_delete(sql, name, binds)
binds = binds.dup
# Pretend to support bind parameters
execute sql.gsub("\0") { quote(*binds.shift.reverse) }, name
@connection.affected_rows
end
alias :exec_update :exec_delete
def last_inserted_id(result)
@connection.last_id
end
def update_sql(sql, name = nil)
super
@connection.affected_rows
end
def begin_db_transaction
execute "BEGIN"
rescue Exception
# Transactions aren't supported
end
def commit_db_transaction
execute "COMMIT"
rescue Exception
# Transactions aren't supported
end
def rollback_db_transaction
execute "ROLLBACK"
rescue Exception
# Transactions aren't supported
end
def create_savepoint
execute("SAVEPOINT #{current_savepoint_name}")
end
def rollback_to_savepoint
execute("ROLLBACK TO SAVEPOINT #{current_savepoint_name}")
end
def release_savepoint
execute("RELEASE SAVEPOINT #{current_savepoint_name}")
end
def add_limit_offset!(sql, options)
limit, offset = options[:limit], options[:offset]
if limit && offset
sql << " LIMIT #{offset.to_i}, #{sanitize_limit(limit)}"
elsif limit
sql << " LIMIT #{sanitize_limit(limit)}"
elsif offset
sql << " OFFSET #{offset.to_i}"
end
sql
end
deprecate :add_limit_offset!
# SCHEMA STATEMENTS ========================================
def structure_dump
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 #{quote_table_name(table.to_a.first.last)}")["Create Table"] + ";\n\n"
end
end
# Drops the database specified on the +name+ attribute
# and creates it again using the provided +options+.
def recreate_database(name, options = {})
drop_database(name)
create_database(name, options)
end
# Create a new MySQL database with optional <tt>:charset</tt> and <tt>:collation</tt>.
# Charset defaults to utf8.
#
# Example:
# create_database 'charset_test', :charset => 'latin1', :collation => 'latin1_bin'
# create_database 'matt_development'
# create_database 'matt_development', :charset => :big5
def create_database(name, options = {})
if options[:collation]
execute "CREATE DATABASE `#{name}` DEFAULT CHARACTER SET `#{options[:charset] || 'utf8'}` COLLATE `#{options[:collation]}`"
else
execute "CREATE DATABASE `#{name}` DEFAULT CHARACTER SET `#{options[:charset] || 'utf8'}`"
end
end
# Drops a MySQL database.
#
# Example:
# drop_database('sebastian_development')
def drop_database(name) #:nodoc:
execute "DROP DATABASE IF EXISTS `#{name}`"
end
def current_database
select_value 'SELECT DATABASE() as db'
end
# Returns the database character set.
def charset
show_variable 'character_set_database'
end
# Returns the database collation strategy.
def collation
show_variable 'collation_database'
end
def tables(name = nil, database = nil) #:nodoc:
sql = ["SHOW TABLES", database].compact.join(' IN ')
execute(sql, 'SCHEMA').collect do |field|
field.first
end
end
def table_exists?(name)
return true if super
name = name.to_s
schema, table = name.split('.', 2)
unless table # A table was provided without a schema
table = schema
schema = nil
end
tables(nil, schema).include? table
end
def drop_table(table_name, options = {})
super(table_name, options)
end
# Returns an array of indexes for the given table.
def indexes(table_name, name = nil)
indexes = []
current_index = nil
result = execute("SHOW KEYS FROM #{quote_table_name(table_name)}", 'SCHEMA')
result.each(:symbolize_keys => true, :as => :hash) do |row|
if current_index != row[:Key_name]
next if row[:Key_name] == PRIMARY # skip the primary key
current_index = row[:Key_name]
indexes << Mysql2IndexDefinition.new(row[:Table], row[:Key_name], row[:Non_unique] == 0, [], [])
end
indexes.last.columns << row[:Column_name]
indexes.last.lengths << row[:Sub_part]
end
indexes
end
# Returns an array of +Mysql2Column+ objects for the table specified by +table_name+.
def columns(table_name, name = nil)
sql = "SHOW FIELDS FROM #{quote_table_name(table_name)}"
columns = []
result = execute(sql, 'SCHEMA')
result.each(:symbolize_keys => true, :as => :hash) { |field|
columns << Mysql2Column.new(field[:Field], field[:Default], field[:Type], field[:Null] == "YES")
}
columns
end
def create_table(table_name, options = {})
super(table_name, options.reverse_merge(:options => "ENGINE=InnoDB"))
end
# Renames a table.
#
# Example:
# rename_table('octopuses', 'octopi')
def rename_table(table_name, new_name)
execute "RENAME TABLE #{quote_table_name(table_name)} TO #{quote_table_name(new_name)}"
end
def add_column(table_name, column_name, type, options = {})
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])}"
add_column_options!(add_column_sql, options)
add_column_position!(add_column_sql, options)
execute(add_column_sql)
end
def change_column_default(table_name, column_name, default)
column = column_for(table_name, column_name)
change_column table_name, column_name, column.sql_type, :default => default
end
def change_column_null(table_name, column_name, null, default = nil)
column = column_for(table_name, column_name)
unless null || default.nil?
execute("UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote(default)} WHERE #{quote_column_name(column_name)} IS NULL")
end
change_column table_name, column_name, column.sql_type, :null => null
end
def change_column(table_name, column_name, type, options = {})
column = column_for(table_name, column_name)
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)
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)
keys = []
result = execute("DESCRIBE #{quote_table_name(table)}", 'SCHEMA')
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
deprecate :case_sensitive_equality_operator
def case_sensitive_modifier(node)
Arel::Nodes::Bin.new(node)
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)
# By default, MySQL 'where id is null' selects the last inserted id.
# Turn this off. http://dev.rubyonrails.org/ticket/6778
variable_assignments = ['SQL_AUTO_IS_NULL=0']
encoding = @config[:encoding]
# make sure we set the encoding
variable_assignments << "NAMES '#{encoding}'" if encoding
# increase timeout so mysql server doesn't disconnect us
wait_timeout = @config[:wait_timeout]
wait_timeout = 2592000 unless wait_timeout.is_a?(Fixnum)
variable_assignments << "@@wait_timeout = #{wait_timeout}"
execute("SET #{variable_assignments.join(', ')}", :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, binds = [])
binds = binds.dup
exec_query(sql.gsub("\0") { quote(*binds.shift.reverse) }, name).to_a
end
def exec_query(sql, name = 'SQL', binds = [])
@connection.query_options[:database_timezone] = ActiveRecord::Base.default_timezone
log(sql, name, binds) do
begin
result = @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
ActiveRecord::Result.new(result.fields, result.to_a)
end
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
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