Class ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter < ActiveRecord::ConnectionAdapters::AbstractAdapter

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 102
class_attribute :emulate_booleans

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 133
def initialize(connection, logger, connection_options, config)
  super(connection, logger)
  @connection_options, @config = connection_options, config
  @quoted_column_names, @quoted_table_names = {}, {}

  if config.fetch(:prepared_statements) { true }
    @visitor = Arel::Visitors::MySQL.new self
  else
    @visitor = BindSubstitution.new self
  end
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 460
def add_column(table_name, column_name, type, options = {})
  execute("ALTER TABLE #{quote_table_name(table_name)} #{add_column_sql(table_name, column_name, type, options)}")
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 512
def add_column_position!(sql, options)
  if options[:first]
    sql << " FIRST"
  elsif options[:after]
    sql << " AFTER #{quote_column_name(options[:after])}"
  end
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 267
def begin_db_transaction
  execute "BEGIN"
rescue Exception
  # Transactions aren't supported
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 549
def case_insensitive_comparison(table, attribute, column, value)
  if column.case_sensitive?
    super
  else
    table[attribute].eq(value)
  end
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 545
def case_sensitive_modifier(node)
  Arel::Nodes::Bin.new(node)
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 464
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

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 469
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

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 369
def charset
  show_variable 'character_set_database'
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 374
def collation
  show_variable 'collation_database'
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 348
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

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 285
def create_savepoint
  execute("SAVEPOINT #{current_savepoint_name}")
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 364
def current_database
  select_value 'SELECT DATABASE() as db'
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 241
def execute(sql, name = nil)
  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

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 557
def limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key)
  where_sql
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 173
def native_database_types
  NATIVE_DATABASE_TYPES
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 527
def pk_and_sequence_for(table)
  execute_and_free("SHOW CREATE TABLE #{quote_table_name(table)}", 'SCHEMA') do |result|
    create_table = each_hash(result).first[:"Create Table"]
    if create_table.to_s =~ /PRIMARY KEY\s+(?:USING\s+\w+\s+)?\((.+)\)/
      keys = $1.split(",").map { |key| key.gsub(/[`"]/, "") }
      keys.length == 1 ? [keys.first, nil] : nil
    else
      nil
    end
  end
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 540
def primary_key(table)
  pk_and_sequence = pk_and_sequence_for(table)
  pk_and_sequence && pk_and_sequence.first
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 198
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

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 221
def quoted_false
  QUOTED_FALSE
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 217
def quoted_true
  QUOTED_TRUE
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 336
def recreate_database(name, options = {})
  drop_database(name)
  create_database(name, options)
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 293
def release_savepoint
  execute("RELEASE SAVEPOINT #{current_savepoint_name}")
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 456
def rename_table(table_name, new_name)
  execute "RENAME TABLE #{quote_table_name(table_name)} TO #{quote_table_name(new_name)}"
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 289
def rollback_to_savepoint
  execute("ROLLBACK TO SAVEPOINT #{current_savepoint_name}")
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 521
def show_variable(name)
  variables = select_all("SHOW VARIABLES LIKE '#{name}'")
  variables.first['Value'] unless variables.empty?
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 169
def supports_index_sort_order?
  true
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 150
def supports_migrations?
  true
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 154
def supports_primary_key?
  true
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 159
def supports_savepoints?
  true
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 388
def table_exists?(name)
  return false unless name
  return true if tables(nil, nil, name).any?

  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, table).any?
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 488
def type_to_sql(type, limit = nil, precision = nil, scale = nil)
  case type.to_s
  when '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
  when 'text'
    case limit
    when 0..0xff;               'tinytext'
    when nil, 0x100..0xffff;    'text'
    when 0x10000..0xffffff;     'mediumtext'
    when 0x1000000..0xffffffff; 'longtext'
    else raise(ActiveRecordError, "No text type has character length #{limit}")
    end
  else
    super
  end
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 599
def add_column_sql(table_name, column_name, type, options = {})
  add_column_sql = "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)
  add_column_sql
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 563
def add_index_length(option_strings, column_names, options = {})
  if options.is_a?(Hash) && length = options[:length]
    case length
    when Hash
      column_names.each {|name| option_strings[name] += "(#{length[name]})" if length.has_key?(name) && length[name].present?}
    when Fixnum
      column_names.each {|name| option_strings[name] += "(#{length})"}
    end
  end

  return option_strings
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 644
def add_index_sql(table_name, column_name, options = {})
  index_name, index_type, index_columns = add_index_options(table_name, column_name, options)
  "ADD #{index_type} INDEX #{index_name} (#{index_columns})"
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 654
def add_timestamps_sql(table_name)
  [add_column_sql(table_name, :created_at, :datetime), add_column_sql(table_name, :updated_at, :datetime)]
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 606
def change_column_sql(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 = "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)
  change_column_sql
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 576
def quoted_columns_for_index(column_names, options = {})
  option_strings = Hash[column_names.map {|name| [name, '']}]

  # add index length
  option_strings = add_index_length(option_strings, column_names, options)

  # add index sort order
  option_strings = add_index_sort_order(option_strings, column_names, options)

  column_names.map {|name| quote_column_name(name) + option_strings[name]}
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 639
def remove_column_sql(table_name, *column_names)
  columns_for_remove(table_name, *column_names).map {|column_name| "DROP #{column_name}" }
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 649
def remove_index_sql(table_name, options = {})
  index_name = index_name_for_remove(table_name, options)
  "DROP INDEX #{index_name}"
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 658
def remove_timestamps_sql(table_name)
  [remove_column_sql(table_name, :updated_at), remove_column_sql(table_name, :created_at)]
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 623
def rename_column_sql(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 = "CHANGE #{quote_column_name(column_name)} #{quote_column_name(new_column_name)} #{current_type}"
  add_column_options!(rename_column_sql, options)
  rename_column_sql
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 588
def translate_exception(exception, message)
  case error_number(exception)
  when 1062
    RecordNotUnique.new(message, exception)
  when 1452
    InvalidForeignKey.new(message, exception)
  else
    super
  end
end