python mysql escape \ n（简单语法错误）

Question

我想使用这个python命令将mysql数据库导出到.csv文件中。

cursor.execute("""SELECT * INTO OUTFILE 'NullServids.csv' FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' ESCAPED BY '\\' LINES TERMINATED BY '\\n' FROM accounts WHERE srvid is NULL""") 

但它返回以下语法错误。

_mysql_exceptions.ProgrammingError: (1064, "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '\\n' FROM accounts WHERE srvid is NULL' at line 1") 

因此，我试图不逃脱换行符，当我将它复制并粘贴到MySQL时显然是有效的。

cursor.execute("""SELECT * INTO OUTFILE 'NullServids.csv' FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' ESCAPED BY '\\' LINES TERMINATED BY '\n' FROM accounts WHERE srvid is NULL""") 

但我得到这个错误：

_mysql_exceptions.ProgrammingError: (1064, "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' FROM accounts WHERE srvid is NULL' at line 2") 

所以我的问题是，什么是逃跑的换行符，这样在cursor.execute()调用正确解释的正确方法？我谷歌搜索，找不到答案，很多我的尴尬。

Answer 1

你忘了反斜杠在字符串中逃逸，因此\没有任何意义。 如果您尝试打印字符串你使用，你会看到，随着反斜线的地方是空的

试试这个：

"""SELECT * INTO OUTFILE 'NullServids.csv' FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' ESCAPED BY '\\\\' LINES TERMINATED BY '\\n' FROM accounts WHERE srvid is NULL"""