安装Mysql 2 gem失败

Question

我正在尝试安装mysql2 (版本为0.4.5)，我使用的是Rails 5.0.2，Ruby2.3.1

我已经使用homebrew (版本8.0.11)安装了mysql服务器，并启动了mysql：

brew install mysql
brew services start mysql

Gemfile.rb

gem 'mysql2'

当我尝试安装gem mysql2时，我得到以下错误

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /Users/gomathi/.rvm/gems/ruby-2.3.1@connector/gems/mysql2-0.4.5/ext/mysql2

creating Makefile

current directory: /Users/gomathi/.rvm/gems/ruby-2.3.1@connector/gems/mysql2-0.4.5/ext/mysql2
make "DESTDIR=" clean

current directory: /Users/gomathi/.rvm/gems/ruby-2.3.1@connector/gems/mysql2-0.4.5/ext/mysql2
make "DESTDIR="
compiling client.c
In file included from client.c:1:
In file included from ./mysql2_ext.h:41:
./result.h:24:3: error: unknown type name 'my_bool'
  my_bool *is_null;
  ^
./result.h:25:3: error: unknown type name 'my_bool'
  my_bool *error;
  ^
client.c:507:3: error: use of undeclared identifier 'my_bool'
  my_bool res = mysql_read_query_result(client);
  ^
client.c:509:19: error: use of undeclared identifier 'res'
  return (void *)(res == 0 ? Qtrue : Qfalse);
                  ^
client.c:828:3: error: use of undeclared identifier 'my_bool'
  my_bool boolval;
  ^
client.c:859:7: error: use of undeclared identifier 'boolval'
      boolval = (value == Qfalse ? 0 : 1);
      ^
client.c:860:17: error: use of undeclared identifier 'boolval'
      retval = &boolval;
                ^
client.c:863:10: error: use of undeclared identifier 'MYSQL_SECURE_AUTH'; did you mean 'MYSQL_DEFAULT_AUTH'?
    case MYSQL_SECURE_AUTH:
         ^~~~~~~~~~~~~~~~~
         MYSQL_DEFAULT_AUTH
/usr/local/Cellar/mysql/8.0.11/include/mysql/mysql.h:188:3: note: 'MYSQL_DEFAULT_AUTH' declared here
  MYSQL_DEFAULT_AUTH,
  ^
client.c:864:7: error: use of undeclared identifier 'boolval'
      boolval = (value == Qfalse ? 0 : 1);
      ^
client.c:865:17: error: use of undeclared identifier 'boolval'
      retval = &boolval;
                ^
client.c:896:38: error: use of undeclared identifier 'boolval'
        wrapper->reconnect_enabled = boolval;
                                     ^
client.c:1285:38: error: use of undeclared identifier 'MYSQL_SECURE_AUTH'; did you mean 'MYSQL_DEFAULT_AUTH'?
  return _mysql_client_options(self, MYSQL_SECURE_AUTH, value);
                                     ^~~~~~~~~~~~~~~~~
                                     MYSQL_DEFAULT_AUTH
/usr/local/Cellar/mysql/8.0.11/include/mysql/mysql.h:188:3: note: 'MYSQL_DEFAULT_AUTH' declared here
  MYSQL_DEFAULT_AUTH,
  ^
12 errors generated.
make: *** [client.o] Error 1

make failed, exit code 2

我怎样才能完成这项工作呢？

Answer 1

您正在安装较旧版本的gem (0.4.5)。我也有同样的问题(使用0.4.3)。安装0.4.10版本为我解决了这个问题。

试试这个：

gem install mysql2 -v 0.4.10

如果可以完全安装，您必须更新您的Gemfile以要求此版本：

gem 'mysql2', '~> 0.4.10'

不要安装较新版本的gem (即0.5.x)，它们不能与Rails 4或更早版本的Rails 5(5.0.7/5.1.6之前)一起工作(请参阅https://github.com/brianmario/mysql2/issues/950)。

Answer 2

根据MySQL 5.7 document MYSQL_SECURE_AUTH在5.7中默认已启用，因为mysql2未编译到版本0.4.10以下的MySQL => 5.7

• https://github.com/brianmario/mysql2/releases/tag/0.4.10
• https://github.com/brianmario/mysql2/issues/891
• https://dev.mysql.com/doc/refman/5.6/en/mysql-options.html

Answer 3

另一个适用于我的替代方案是安装MariaDB，也就是10.0.x版本

$ brew install mariadb@10.0
$ brew link mariadb@10.0 --force

要自动启动MariaDB服务器，请使用Homebrew的服务功能，该功能与macOS启动auto集成：

brew services start mariadb@10.0

现在，mysql2的安装将会非常出色。

$ gem install mysql2 -v '0.4.6'
Building native extensions. This could take a while...
Successfully installed mysql2-0.4.6