mysql2 gem，Rails 3.0.3和“不兼容字符编码”错误 [英] mysql2 gem, Rails 3.0.3 and "incompatible character encodings" errors

问题描述

我使用Rails 3.0.3，我已经将mysql适配器从ruby-mysql更改为mysql2，但现在我有以下错误：

I'm using Rails 3.0.3, and I have changed the mysql adapter from ruby-mysql to mysql2, but now I have the following error:

incompatible character encodings: ASCII-8BIT and UTF-8

application.rb： b

config.encoding = "utf-8"

database.yml：

database.yml:

development:   
  adapter: mysql2
  encoding: utf8
  database: rails3_development
  username: root
  password:
  host: localhost

宝石：

specs:
  abstract (1.0.0)
  actionmailer (3.0.3)
  actionpack (3.0.3)
  activemodel (3.0.3)
  activerecord (3.0.3)
  activeresource (3.0.3)
  activesupport (3.0.3)
  arel (2.0.7)
  bcrypt-ruby (2.1.4)
  builder (2.1.2)
  erubis (2.6.6)
  i18n (0.5.0)
  jquery-rails (0.2.6)
  mail (2.2.15)
  mime-types (1.16)
  **mysql2 (0.2.6)
  orm_adapter (0.0.4)
  paperclip (2.3.8)
  polyglot (0.3.1)
  rack (1.2.1)
  rack-mount (0.6.13)
  rack-test (0.5.7)
  rails (3.0.3)
  railties (3.0.3)
  rake (0.8.7)
  thor (0.14.6)
  treetop (1.4.9)
  tzinfo (0.3.24)
  warden (1.0.3)
  will_paginate (3.0.pre2)

推荐答案

我有一个类似的问题：varchar字段，具有ASCII-8BIT编码的排序规则utf8_bin。

I have a similar problem: a varchar field with collation utf8_bin having an ASCII-8BIT encoding.

问题出在mysql2 gem，不是在Rails，在mysql设置，至少在我的情况下，因为它不会发生ruby-mysql宝石。

The problem lies in the mysql2 gem, not in Rails, nor in the mysql settings, in my case at least, because it doesn't occur with the ruby-mysql gem.

请测试当您切换到ruby-mysql时问题是否消失。

Please test if the problem goes away when you switch to ruby-mysql.

从irb on ruby​​ 1.9.2，演示了问题：

The following code, run from irb on ruby 1.9.2, demonstrates the problem:

require 'mysql2'
c = Mysql2::Client.new(host: "localhost", username: "root", database: 'd')
c.query("select word from t where word = 'a'").to_a[0]["word"].encoding
# => #<Encoding:ASCII-8BIT>

在一个mysql数据库上，每个可能的设置都设置为utf8_bin排序规则。

This on a mysql database where every conceivable setting has been set to a utf8_bin collation.

在mysql2 gem中，在第253行的 result.c 文件中有以下代码片段：

In the mysql2 gem, in the result.c file on line 253, there's the following snippet:

if (fields[i].flags & BINARY_FLAG) {
  rb_enc_associate(val, binaryEncoding);
} else ...

我相信这是二进制编码被设置，也许是因为utf8_bin排序规则...我已经删除它，它解决了问题，但我相信它可能会引入其他问题，与blobs为例。

I believe this is where the binary (ASCII-8BIT) encoding is being set, maybe because of the utf8_bin collation... I've removed it, and it solved the problem, but I'm sure it will probably introduce other problems, with blobs for instance.

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