如何通过Ruby'连接到MySQL；s"；mysql2“；宝石

我安装了一个新的MySQL实例，并尝试通过MySQL工作台（使用IP地址、默认端口、用户名/密码）连接到该实例。连接成功。所以这些值是正确的

然后，我创建了一个新的数据库模式“newDB”，并为同一个用户授予了newDB的所有特权

接下来，我将使用以下ruby代码连接到这个MySQL实例

require 'fileutils'
require 'logger'
require 'sequel'
require 'mysql2'

DATABASE_URL = 'mysql2://The.IP.Address:3306'

DB_OPTIONS = { encoding: 'utf8', sql_log_level: :debug, adapter: "mysql2",  database: "newDB", password: 'password123', username: 'someUser', host:'The.IP.Address', port:'3306'  }

database_connection = Sequel.connect(DATABASE_URL, DB_OPTIONS.merge(logger: database_logger))

但是，此连接失败。以下是stacktrace：

13: from C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sequel-5.44.0/lib/sequel/core.rb:124:in `connect'
        12: from C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sequel-5.44.0/lib/sequel/database/connecting.rb:57:in `connect'
        11: from C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sequel-5.44.0/lib/sequel/database/connecting.rb:57:in `new'
        10: from C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sequel-5.44.0/lib/sequel/database/misc.rb:169:in `initialize'
         9: from C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sequel-5.44.0/lib/sequel/database/connecting.rb:278:in `test_connection'
         8: from C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sequel-5.44.0/lib/sequel/database/connecting.rb:269:in `synchronize'
         7: from C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sequel-5.44.0/lib/sequel/connection_pool/threaded.rb:91:in `hold'
         6: from C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sequel-5.44.0/lib/sequel/connection_pool/threaded.rb:139:in `acquire'
         5: from C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sequel-5.44.0/lib/sequel/connection_pool/threaded.rb:209:in `assign_connection'
         4: from C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sequel-5.44.0/lib/sequel/connection_pool.rb:122:in `make_new'
         3: from C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sequel-5.44.0/lib/sequel/adapters/mysql2.rb:43:in `connect'
         2: from C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/sequel-5.44.0/lib/sequel/adapters/mysql2.rb:43:in `new'
         1: from C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/mysql2-0.5.3-x64-mingw32/lib/mysql2/client.rb:90:in `initialize'
C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/mysql2-0.5.3-x64-mingw32/lib/mysql2/client.rb:90:in `connect': Mysql2::Erro (Sequel::DatabaseConnectionError)sha2_password' cannot be loaded: The specified module could not be found.

---

如何修复此错误？我似乎已经为主机名、用户名等提供了正确的值。

我终于解决了这个问题。存在多个问题：

默认情况下，MySQL使用较新的sha256身份验证。当我们直接以文本形式提供密码时，这会导致问题

解决方案1是创建一个新用户，并在创建过程中使用本机身份验证

SQL错误仍然保持不变，即使我们更进一步。下一个问题是SQL搜索用户someUser@%

快速修复方法是创建具有该名称的用户（重复#1）

另一个问题是，SQL希望用户也具有某些管理角色，而不仅仅是模式权限（感谢MySQL！）

因此，您还需要为用户提供管理角色