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当无法建立到数据库的连接时引发，因为无法连接到主机或授权失败。

方法
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类公共方法

hostname_error(hostname)

来源: 显示 | 在GitHub上

# File activerecord/lib/active_record/errors.rb, line 107
      def hostname_error(hostname)
        DatabaseConnectionError.new(<<~MSG)
          There is an issue connecting with your hostname: #{hostname}.\n
          Please check your database configuration and ensure there is a valid connection to your database.
        MSG
      end

new(message = nil)

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# File activerecord/lib/active_record/errors.rb, line 102
def initialize(message = nil)
  super(message || "Database connection error")
end

username_error(username)

来源: 显示 | 在GitHub上

# File activerecord/lib/active_record/errors.rb, line 114
      def username_error(username)
        DatabaseConnectionError.new(<<~MSG)
          There is an issue connecting to your database with your username/password, username: #{username}.\n
          Please check your database configuration to ensure the username/password are valid.
        MSG
      end