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# frozen_string_literal: true
require "active_record/connection_adapters/abstract_mysql_adapter"
require "active_record/connection_adapters/mysql/database_statements"
gem "mysql2", ">= 0.3.18", "< 0.5"
require "mysql2"
raise "mysql2 0.4.3 is not supported. Please upgrade to 0.4.4+" if Mysql2::VERSION == "0.4.3"
module ActiveRecord
module ConnectionHandling # :nodoc:
# Establishes a connection to the database that's used by all Active Record objects.
def mysql2_connection(config)
config = config.symbolize_keys
config[:flags] ||= 0
if config[:flags].kind_of? Array
config[:flags].push "FOUND_ROWS".freeze
else
config[:flags] |= Mysql2::Client::FOUND_ROWS
end
client = Mysql2::Client.new(config)
ConnectionAdapters::Mysql2Adapter.new(client, logger, nil, config)
rescue Mysql2::Error => error
if error.message.include?("Unknown database")
raise ActiveRecord::NoDatabaseError
else
raise
end
end
end
module ConnectionAdapters
class Mysql2Adapter < AbstractMysqlAdapter
ADAPTER_NAME = "Mysql2".freeze
include MySQL::DatabaseStatements
def initialize(connection, logger, connection_options, config)
super
@prepared_statements = false unless config.key?(:prepared_statements)
configure_connection
end
def supports_json?
!mariadb? && version >= "5.7.8"
end
def supports_comments?
true
end
def supports_comments_in_create?
true
end
def supports_savepoints?
true
end
# HELPER METHODS ===========================================
def each_hash(result) # :nodoc:
if block_given?
result.each(as: :hash, symbolize_keys: true) do |row|
yield row
end
else
to_enum(:each_hash, result)
end
end
def error_number(exception)
exception.error_number if exception.respond_to?(:error_number)
end
#--
# QUOTING ==================================================
#++
def quote_string(string)
@connection.escape(string)
end
#--
# CONNECTION MANAGEMENT ====================================
#++
def active?
@connection.ping
end
def reconnect!
super
disconnect!
connect
end
alias :reset! :reconnect!
# Disconnects from the database if already connected.
# Otherwise, this method does nothing.
def disconnect!
super
@connection.close
end
private
def connect
@connection = Mysql2::Client.new(@config)
configure_connection
end
def configure_connection
@connection.query_options.merge!(as: :array)
super
end
def full_version
@full_version ||= @connection.server_info[:version]
end
end
end
end
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