如何在输出中获取 Escape char '\\\\'

Question

有人可以帮助在我的配置单元插入覆盖查询输出中获取'\ \ \ \'（四个反斜杠）。

我试过了：

beeline = "beeline -u 'jdbc:hive2:blahblah'"
exportDir = " /dev/targetdir "
presql =  ' INSERT OVERWRITE DIRECTORY \'' + exportDir + '\' ROW FORMAT DELIMITED FIELDS TERMINATED BY \',\' ' + 'ESCAPED BY \'\\\\\' NULL DEFINED AS \'\' '
sql = " select abc from xyz limit 10 "

>>> print(beeline + " -e " + '\"'+ presql + sql+'\"')

beeline -u 'jdbc:hive2blahblah' -e "INSERT OVERWRITE DIRECTORY '/dev/targetDir/' ROW FORMAT DELIMITED FIELDS TERMINATED BY ',' ESCAPED BY '\\' NULL DEFINED AS '' select abc from xyz limit 10"


#Expected O/p:

beeline -u 'jdbc:hive2blahblah' -e "INSERT OVERWRITE DIRECTORY '/dev/targetDir/' ROW FORMAT DELIMITED FIELDS TERMINATED BY ',' ESCAPED BY '\\\\' NULL DEFINED AS '' select abc from xyz limit 10"

Answer 1

你可以像这样定义一个原始字符串：

slash_str = r"your_string_with_slashes"

在此处阅读有关原始字符串的更多信息：Link

Answer 2

为了转义单个 \，您需要使用额外的 \ 作为转义字符。因此，要获得预期的输出，您需要有 8 个 \ - 然后每对转义字符加上要转义的字符将显示一个 \。