# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 34
def initialize(connection, logger, connection_options, config)
  super
  @prepared_statements = false
  configure_connection
end

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 81
def active?
  @connection.ping
end

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 94
def disconnect!
  super
  @connection.close
end

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 65
def error_number(exception)
  exception.error_number if exception.respond_to?(:error_number)
end

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 237
def exec_delete(sql, name, binds)
  execute to_sql(sql, binds), name
  @connection.affected_rows
end

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 233
def exec_insert(sql, name, binds, pk = nil, sequence_name = nil)
  execute to_sql(sql, binds), name
end

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 220
def exec_query(sql, name = 'SQL', binds = [])
  result = execute(sql, name)
  ActiveRecord::Result.new(result.fields, result.to_a)
end

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 212
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

  super
end

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 103
def explain(arel, binds = [])
  sql     = "EXPLAIN #{to_sql(arel, binds.dup)}"
  start   = Time.now
  result  = exec_query(sql, 'EXPLAIN', binds)
  elapsed = Time.now - start

  ExplainPrettyPrinter.new.pp(result, elapsed)
end

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 41
def initialize_schema_migrations_table
  if charset == 'utf8mb4'
    ActiveRecord::SchemaMigration.create_table(MAX_INDEX_LENGTH_FOR_UTF8MB4)
  else
    ActiveRecord::SchemaMigration.create_table
  end
end

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 227
def insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)
  super
  id_value || @connection.last_id
end

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 243
def last_inserted_id(result)
  @connection.last_id
end

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 73
def quote_string(string)
  @connection.escape(string)
end

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 85
def reconnect!
  super
  disconnect!
  connect
end

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 207
def select_rows(sql, name = nil, binds = [])
  execute(sql, name).to_a
end

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 49
def supports_explain?
  true
end