#2 楼 @angelfan 照这种方法也可以解决

终于查清楚原因了，是 dbi 包自身的问题，修改 dbi 的源代码如下: 源代码

@hash.each_key do |x|
    if x.kind_of? String
        sym = x.to_sym
        if @hash.has_key? sym
            raise ::TypeError, 
                "#{self.class.name} may construct from a hash keyed with strings or symbols, but not both" 
        end
        @hash[sym] = @hash[x]
        @hash.delete(x)
    end
end

修改为如下：

hash_size = @hash.size()
keys = @hash.keys
#puts "#{keys}"
#puts hash_size
for i in 0..hash_size-1
  keyi = keys[i]
  #puts "#{keyi}"
  if keys[i].kind_of? String
    sym = keyi.to_sym
    if @hash.has_key? sym 
      raise ::TypeError, "#{self.class.name} may construct from a hash keyed with strings or symbols, but not both" 
    end 
    @hash[sym] = @hash[keyi]
    @hash.delete(keyi)
  end 
end 

#8 楼 @king1990_cool 错误就是出自 dbh sqlanywhere，现在打算先用 C 连接 sybase，然后在调用 C，试试行不行，谢谢耐心回答

#5 楼 @rubyist518 还有什么别的方法能连 sybase ASE/IQ吗？

#3 楼 @king1990_cool 不行，提示" Database server not found (DBI::DatabaseError)"错误，还有别的什么方法能连接 sybase 吗？

#1 楼 @king1990_cool 用 Mysql 和 Mysql2 都能连接 mysql，现在打算用 sqlanywhere 连接 sybase，问题是用 sqlanywhere，mysql 也连接不了，总出现问题：Database server not found (DBI::DatabaseError)。以下连接语句都不行： dbh=DBI.connect('DBI:SQLAnywhere:db_oa:localhost','root', 'root') dbh=DBI.connect("DBI:SQLAnywhere:Host=192.168.142.128:3306;DatabaseName=db_oa",'root','root') dbh = DBI.connect("DBI:SQLAnywhere:db_oa:localhost","root","root") dbh = DBI.connect("DBI:SQLAnywhere:mydatabase:192.168.100.120","sa","560128") dbh=DBI.connect("DBI:SQLAnywhere:Host=192.168.100.120:5000;DatabaseName=mydatabase",'sa','560128')