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

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 128
class_attribute :emulate_booleans

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 162
def initialize(connection, logger, connection_options, config)
  super(connection, logger)
  @connection_options, @config = connection_options, config
  @quoted_column_names, @quoted_table_names = {}, {}

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

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 559
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 309
def begin_db_transaction
  execute "BEGIN"
rescue
  # Transactions aren't supported
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 315
def begin_isolated_db_transaction(isolation)
  execute "SET TRANSACTION ISOLATION LEVEL #{transaction_isolation_levels.fetch(isolation)}"
  begin_db_transaction
rescue
  # Transactions aren't supported
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 596
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 592
def case_sensitive_modifier(node)
  Arel::Nodes::Bin.new(node)
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 498
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 503
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 401
def charset
  show_variable 'character_set_database'
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 406
def collation
  show_variable 'collation_database'
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 380
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 334
def create_savepoint
  execute("SAVEPOINT #{current_savepoint_name}")
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 396
def current_database
  select_value 'SELECT DATABASE() as db'
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 358
def empty_insert_statement_value
  "VALUES ()"
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 283
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.new("'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.", exception.original_exception)
  else
    raise
  end
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 215
def index_algorithms
  { default: 'ALGORITHM = DEFAULT', copy: 'ALGORITHM = COPY', inplace: 'ALGORITHM = INPLACE' }
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 604
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 211
def native_database_types
  NATIVE_DATABASE_TYPES
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 574
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.delete('`"') }
      keys.length == 1 ? [keys.first, nil] : nil
    else
      nil
    end
  end
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 587
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 240
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 263
def quoted_false
  QUOTED_FALSE
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 259
def quoted_true
  QUOTED_TRUE
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 366
def recreate_database(name, options = {})
  drop_database(name)
  sql = create_database(name, options)
  reconnect!
  sql
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 342
def release_savepoint
  execute("RELEASE SAVEPOINT #{current_savepoint_name}")
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 493
def rename_table(table_name, new_name)
  execute "RENAME TABLE #{quote_table_name(table_name)} TO #{quote_table_name(new_name)}"
  rename_table_indexes(table_name, new_name)
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 338
def rollback_to_savepoint
  execute("ROLLBACK TO SAVEPOINT #{current_savepoint_name}")
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 23
def schema_creation
  SchemaCreation.new self
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 568
def show_variable(name)
  variables = select_all("SHOW VARIABLES LIKE '#{name}'", 'SCHEMA')
  variables.first['Value'] unless variables.empty?
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 608
def strict_mode?
  self.class.type_cast_config_to_boolean(@config.fetch(:strict, true))
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 199
def supports_index_sort_order?
  true
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 180
def supports_migrations?
  true
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 184
def supports_primary_key?
  true
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 189
def supports_savepoints?
  true
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 207
def supports_transaction_isolation?
  version[0] >= 5
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 420
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 528
def type_to_sql(type, limit = nil, precision = nil, scale = nil)
  case type.to_s
  when 'binary'
    case limit
    when 0..0xfff;           "varbinary(#{limit})"
    when nil;                "blob"
    when 0x1000..0xffffffff; "blob(#{limit})"
    else raise(ActiveRecordError, "No binary type has character length #{limit}")
    end
  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 612
def valid_type?(type)
  !native_database_types[type].nil?
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 665
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 629
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 714
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 724
def add_timestamps_sql(table_name, options = {})
  [add_column_sql(table_name, :created_at, :datetime, options), add_column_sql(table_name, :updated_at, :datetime, options)]
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 672
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 642
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 706
def remove_column_sql(table_name, column_name, type = nil, options = {})
  "DROP #{quote_column_name(column_name)}"
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 710
def remove_columns_sql(table_name, *column_names)
  column_names.map {|column_name| remove_column_sql(table_name, column_name) }
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 719
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 728
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 689
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
    options[:auto_increment] = (column.extra == "auto_increment")
  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}'", 'SCHEMA')["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 620
def subquery_for(key, select)
  subsubselect = select.clone
  subsubselect.projections = [key]

  subselect = Arel::SelectManager.new(select.engine)
  subselect.project Arel.sql(key.name)
  subselect.from subsubselect.as('__active_record_temp')
end

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 654
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