Class: Sequel::Mysql2::Database

Inherits:
Object
  • Object
show all
Defined in:
lib/midori-contrib/sequel/mysql2.rb

Overview

Midori Extension of sequel MySQL through meta programming

Instance Method Summary collapse

Instance Method Details

#_execute(conn, sql, opts, &block) ⇒ Mysql2::Result

Execute the given SQL on the given connection. If the :type option is :select, yield the result of the query, otherwise yield the connection if a block is given.

Parameters:

  • conn (Mysql2::Client) —

    connection to database

  • sql (String) —

    sql query

  • opts (Hash) —

    optional options

Returns:

  • (Mysql2::Result) —

    MySQL results



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# File 'lib/midori-contrib/sequel/mysql2.rb', line 23

def _execute(conn, sql, opts, &block)
  # _execute_nonblock(conn, sql, opts, &block)
  if Fiber.current == EventLoop.root_fiber
    # Block usage
    return _execute_block(conn, sql, opts, &block)
  else
    # Nonblock usage
    return _execute_nonblock(conn, sql, opts, &block)
  end
end

#_execute_block ⇒ Object 



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# File 'lib/midori-contrib/sequel/mysql2.rb', line 14

alias_method :_execute_block, :_execute

#_execute_nonblock(conn, sql, opts) ⇒ Mysql2::Result

Execute the given SQL on the given connection. If the :type option is :select, yield the result of the query, otherwise yield the connection if a block is given.

Parameters:

  • conn (Mysql2::Client) —

    connection to database

  • sql (String) —

    sql query

  • opts (Hash) —

    optional options

Returns:

  • (Mysql2::Result) —

    MySQL results



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# File 'lib/midori-contrib/sequel/mysql2.rb', line 41

def _execute_nonblock(conn, sql, opts) # rubocop:disable Metrics/MethodLength, Metrics/CyclomaticComplexity
  begin
    # :nocov:
    stream = opts[:stream]
    if NativePreparedStatements
      if (args = opts[:arguments])
        args = args.map{|arg| bound_variable_value(arg)}
      end

      case sql
        when ::Mysql2::Statement
          stmt = sql
        when Dataset
          sql = sql.sql
          close_stmt = true
          stmt = conn.prepare(sql)
      end
    end

    r = log_connection_yield((log_sql = opts[:log_sql]) ? sql + log_sql : sql, conn, args) do
      if stmt
        conn.query_options.merge!(cache_rows: true,
                                  database_timezone: timezone,
                                  application_timezone: Sequel.application_timezone,
                                  stream: stream,
                                  cast_booleans: convert_tinyint_to_bool)
        stmt.execute(*args)
        # :nocov:
      else
        if MYSQL_SOCKETS[conn.socket].nil?
          MYSQL_SOCKETS[conn.socket] = IO::open(conn.socket)
        end
        socket = MYSQL_SOCKETS[conn.socket]
        await(Promise.new do |resolve|
          count = 0
          EventLoop.register(socket, :rw) do
            if (count == 0)
              # Writable
              count += 1
              conn.query(sql,
                        database_timezone: timezone,
                        application_timezone: Sequel.application_timezone,
                        stream: stream,
                        async: true)
            else
              # Readable
              begin
                EventLoop.deregister(socket)
                resolve.call(conn.async_result)
              rescue ::Mysql2::Error => e
                resolve.call(PromiseException.new(e))
                next
              end
            end
          end
        end)
      end
    end

    # :nocov:
    if opts[:type] == :select
      if r
        if stream
          begin
            r2 = yield r
          ensure
            # If r2 is nil, it means the block did not exit normally,
            # so the rest of the results must be drained to prevent
            # "commands out of sync" errors.
            r.each{} unless r2
          end
        else
          yield r
        end
      end
    elsif block_given?
      yield conn
    end
  rescue ::Mysql2::Error => e
    raise_error(e)
  ensure
    if stmt
      conn.query_options.replace(conn.instance_variable_get(:@sequel_default_query_options))
      stmt.close if close_stmt
    end
    # :nocov:
  end
end