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Methods
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Constants
ADAPTER_NAME = 'Mysql2'.freeze
 
MAX_INDEX_LENGTH_FOR_UTF8MB4 = 191
 
Class Public methods
new(connection, logger, connection_options, config)
# 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
Instance Public methods
active?()
# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 81
def active?
  return false unless @connection
  @connection.ping
end
create(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)
Alias for: insert_sql
disconnect!()

Disconnects from the database if already connected. Otherwise, this method does nothing.

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 95
def disconnect!
  super
  unless @connection.nil?
    @connection.close
    @connection = nil
  end
end
error_number(exception)
# 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
exec_delete(sql, name, binds)
Also aliased as: exec_update
# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 243
def exec_delete(sql, name, binds)
  execute to_sql(sql, binds), name
  @connection.affected_rows
end
exec_insert(sql, name, binds, pk = nil, sequence_name = nil)
# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 239
def exec_insert(sql, name, binds, pk = nil, sequence_name = nil)
  execute to_sql(sql, binds), name
end
exec_query(sql, name = 'SQL', binds = [])
Also aliased as: exec_without_stmt
# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 226
def exec_query(sql, name = 'SQL', binds = [])
  result = execute(sql, name)
  ActiveRecord::Result.new(result.fields, result.to_a)
end
exec_update(sql, name, binds)
Alias for: exec_delete
exec_without_stmt(sql, name = 'SQL', binds = [])
Alias for: exec_query
execute(sql, name = nil)

Executes the SQL statement in the context of this connection.

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 216
def execute(sql, name = nil)
  if @connection
    # 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
  end

  super
end
explain(arel, binds = [])
# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 107
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
initialize_schema_migrations_table()
# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 41
def initialize_schema_migrations_table
  if @config[:encoding] == 'utf8mb4'
    ActiveRecord::SchemaMigration.create_table(MAX_INDEX_LENGTH_FOR_UTF8MB4)
  else
    ActiveRecord::SchemaMigration.create_table
  end
end
insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)
Also aliased as: create
# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 233
def insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)
  super
  id_value || @connection.last_id
end
last_inserted_id(result)
# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 249
def last_inserted_id(result)
  @connection.last_id
end
quote_string(string)
# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 73
def quote_string(string)
  @connection.escape(string)
end
reconnect!()
Also aliased as: reset!
# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 86
def reconnect!
  super
  disconnect!
  connect
end
reset!()
Alias for: reconnect!
select_rows(sql, name = nil, binds = [])

Returns an array of arrays containing the field values. Order is the same as that returned by columns.

# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 211
def select_rows(sql, name = nil, binds = [])
  execute(sql, name).to_a
end
supports_explain?()
# File activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb, line 49
def supports_explain?
  true
end