有什么办法能让这看起来好一点吗?
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'
比如,有没有办法暗示串联?
有什么办法能让这看起来好一点吗?
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'
比如,有没有办法暗示串联?
当前回答
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…
其他回答
像你一样,我也在寻找一个不包括换行符的解决方案。(虽然它们在SQL中可能是安全的,但在我的情况下不安全,我有一个大的文本块要处理)
这可以说是同样丑陋,但你可以在heredoc中反斜杠转义换行符,以从结果字符串中省略它们:
conn.exec <<~END_OF_INPUT
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
END_OF_INPUT
请注意,如果没有插值(即<<~'END_OF_INPUT'),就不能执行此操作,所以要小心。#{expressions}将在这里求值,而在原始代码中不会求值。答:出于这个原因,威尔逊的回答可能更好。
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)
其他选项:
#multi line string
multiline_string = <<EOM
This is a very long string
that contains interpolation
like #{4 + 5} \n\n
EOM
puts multiline_string
#another option for multiline string
message = <<-EOF
asdfasdfsador #{2+2} this month.
asdfadsfasdfadsfad.
EOF
puts message
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。