如何在 Ruby/Rails 中将 load 命令与 MySQL 一起使用？答案

【问题标题】：How to use the load command with MySQL in Ruby/Rails?如何在 Ruby/Rails 中将 load 命令与 MySQL 一起使用？
【发布时间】：2015-04-02 09:50:28
【问题描述】：

在 MySQL 中，我可以运行：

LOAD DATA LOCAL INFILE "/home/pt/test/bal.csv" INTO TABLE bal FIELDS
TERMINATED BY ',' ENCLOSED BY '"' LINES TERMINATED BY '"' IGNORE 1
LINES;

但是，在我的 Ruby 程序中：

str="LOAD DATA LOCAL INFILE "/home/pt/test/bal.csv" INTO TABLE bal
FIELDS TERMINATED BY ',' ENCLOSED BY '"' LINES TERMINATED BY '"'
IGNORE 1 LINES;"

puts str

dbh.query(str)

输出是：

LOAD DATA LOCAL INFILE "/home/pt/test/bal.csv" INTO TABLE bal FIELDS
TERMINATED BY ',' ENCLOSED BY '"' LINES TERMINATED BY '"' IGNORE 1
LINES;

/home/pt/test/ptb.rb:34:in `query': Field separator argument is not what
is expected; check the manual (Mysql::Error)
from /home/pt/test/ptb.rb:34:in `<main>'

这段代码有什么问题？

【问题讨论】：

str="LOAD DATA LOCAL INFILE \"/home/pt/test/bal.csv\" INTO TABLE bal FIELDS TERMINATED BY ',' ENCLOSED BY '\"' LINES TERMINATED BY '\" ' 忽略 1 行；"试试这个它会工作..:)

标签： mysql ruby-on-rails ruby ruby-on-rails-3 mysqldump

【解决方案1】：

删除ENCLOSED BY ' \"'中的空格

str="LOAD DATA LOCAL INFILE \"/home/pt/test/bal.csv\" INTO TABLE bal FIELDS TERMINATED BY ',' ENCLOSED BY '\"' LINES TERMINATED BY '\n' IGNORE 1 LINES;"

%Q[] Ruby syntax 也可能对您有用。它类似于""，但您不需要在字符串中转义"：

str=%Q[LOAD DATA LOCAL INFILE "/home/pt/test/bal.csv" INTO TABLE bal FIELDS TERMINATED BY ',' ENCLOSED BY '"' LINES TERMINATED BY '\n' IGNORE 1 LINES;]

【讨论】：

你试过 %Q[] 语法了吗？
我已经完成了，但它不起作用主要错误是：字段分隔符参数不是预期的；从/home/pt/test/ptb.rb:34:in'查看手册（Mysql::Error）
您能否直接复制并粘贴此代码而不做任何更改：dbh.query %Q[LOAD DATA LOCAL INFILE "/home/pt/test/bal.csv" INTO TABLE bal FIELDS TERMINATED BY ', ' ENCLOSED BY '"' LINES TERMINATED BY '\n' IGNORE 1 LINES;]
完成但我最终得到错误：`query': The used command is not allowed with this MySQL version (Mysql::Error)