# File activerecord/lib/active_record/connection_adapters/mysql_adapter.rb, line 164
      def initialize(connection, logger, connection_options, config)
        super(connection, logger)
        @connection_options, @config = connection_options, config

        connect
      end

# File activerecord/lib/active_record/connection_adapters/mysql_adapter.rb, line 229
      def active?
        if @connection.respond_to?(:stat)
          @connection.stat
        else
          @connection.query 'select 1'
        end

        # mysql-ruby doesn't raise an exception when stat fails.
        if @connection.respond_to?(:errno)
          @connection.errno.zero?
        else
          true
        end
      rescue Mysql::Error
        false
      end

# File activerecord/lib/active_record/connection_adapters/mysql_adapter.rb, line 361
      def charset
        show_variable 'character_set_database'
      end

# File activerecord/lib/active_record/connection_adapters/mysql_adapter.rb, line 366
      def collation
        show_variable 'collation_database'
      end

# File activerecord/lib/active_record/connection_adapters/mysql_adapter.rb, line 344
      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/mysql_adapter.rb, line 356
      def current_database
        select_value 'SELECT DATABASE() as db'
      end

# File activerecord/lib/active_record/connection_adapters/mysql_adapter.rb, line 251
      def disconnect!
        @connection.close rescue nil
      end

# File activerecord/lib/active_record/connection_adapters/mysql_adapter.rb, line 199
      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/mysql_adapter.rb, line 222
      def quoted_false
        "0"
      end

# File activerecord/lib/active_record/connection_adapters/mysql_adapter.rb, line 218
      def quoted_true
        "1"
      end

# File activerecord/lib/active_record/connection_adapters/mysql_adapter.rb, line 246
      def reconnect!
        disconnect!
        connect
      end

# File activerecord/lib/active_record/connection_adapters/mysql_adapter.rb, line 402
      def rename_table(name, new_name)
        execute "RENAME TABLE #{name} TO #{new_name}"
      end

# File activerecord/lib/active_record/connection_adapters/mysql_adapter.rb, line 258
      def select_rows(sql, name = nil)
        @connection.query_with_result = true
        result = execute(sql, name)
        rows = []
        result.each { |row| rows << row }
        result.free
        rows
      end

# File activerecord/lib/active_record/connection_adapters/mysql_adapter.rb, line 433
      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/mysql_adapter.rb, line 439
        def connect
          encoding = @config[:encoding]
          if encoding
            @connection.options(Mysql::SET_CHARSET_NAME, encoding) rescue nil
          end
          @connection.ssl_set(@config[:sslkey], @config[:sslcert], @config[:sslca], @config[:sslcapath], @config[:sslcipher]) if @config[:sslkey]
          @connection.real_connect(*@connection_options)
          execute("SET NAMES '#{encoding}'") if encoding

          # By default, MySQL 'where id is null' selects the last inserted id.
          # Turn this off. http://dev.rubyonrails.org/ticket/6778
          execute("SET SQL_AUTO_IS_NULL=0")
        end

# File activerecord/lib/active_record/connection_adapters/mysql_adapter.rb, line 453
        def select(sql, name = nil)
          @connection.query_with_result = true
          result = execute(sql, name)
          rows = result.all_hashes
          result.free
          rows
        end

# File activerecord/lib/active_record/connection_adapters/mysql_adapter.rb, line 461
        def supports_views?
          version[0] >= 5
        end

# File activerecord/lib/active_record/connection_adapters/mysql_adapter.rb, line 465
        def version
          @version ||= @connection.server_info.scan(/^(\d+)\.(\d+)\.(\d+)/).flatten.map { |v| v.to_i }
        end