有时值得删除新的行字符\n，如:

conn.exec <<-eos.squish
 select attr1, attr2, attr3, attr4, attr5, attr6, attr7
 from table1, table2, table3, etc, etc, etc, etc, etc,
 where etc etc etc etc etc etc etc etc etc etc etc etc etc
eos

conn.exec [
  "select attr1, attr2, attr3, ...",
  "from table1, table2, table3, ...",
  "where ..."
].join(' ')

这个建议的优点在于，自动缩进器可以适当地缩进文档和长字符串的每个部分。但这是以效率为代价的。

是的，如果你不介意额外的换行被插入:

 conn.exec 'select attr1, attr2, attr3, attr4, attr5, attr6, attr7
            from table1, table2, table3, etc, etc, etc, etc, etc,
            where etc etc etc etc etc etc etc etc etc etc etc etc etc'

你也可以使用heredoc:

conn.exec <<-eos
   select attr1, attr2, attr3, attr4, attr5, attr6, attr7
   from table1, table2, table3, etc, etc, etc, etc, etc,
   where etc etc etc etc etc etc etc etc etc etc etc etc etc
eos

如果你不介意额外的空格和换行，你可以使用

conn.exec %w{select attr1, attr2, attr3, attr4, attr5, attr6, attr7
  from table1, table2, table3, etc, etc, etc, etc, etc,
  where etc etc etc etc etc etc etc etc etc etc etc etc etc} * ' '

(使用%W表示插值字符串)

今天的优雅回答:

<<~TEXT
Hi #{user.name}, 

Thanks for raising the flag, we're always happy to help you.
Your issue will be resolved within 2 hours.
Please be patient!

Thanks again,
Team #{user.organization.name}
TEXT

<<-TEXT和<<~TEXT有区别，前者保留了块内的空格，后者则没有。

还有其他的选择。 比如串联等等，但这个更有意义。

如果我错了，请告诉我…

为了避免每一行的圆括号关闭，你可以简单地使用双引号和反斜杠来转义换行:

"select attr1, attr2, attr3, attr4, attr5, attr6, attr7 \
from table1, table2, table3, etc, etc, etc, etc, etc, \
where etc etc etc etc etc etc etc etc etc etc etc etc etc"