错误：can't add a new key into hash during iteration (RuntimeError)

jpwangluo — Thu, 05 May 2016 18:54:30 +0800

在用 SQLAnywhere 连接 Sybase IQ，有以下程序：

def db_query( dbh, sql )
    sth = dbh.execute(sql)
    print "# of Fields:  #{sth.column_names.size}\n"
    sth.fetch do |row|
        print "\n"
        sth.column_info.each_with_index do |info, i|
            unless info["type_name"] == "LONG VARBINARY"
                print "#{info["name"]}=#{row[i]}\n" 
            end 
        end 
    end 
    sth.finish
end

程序的完整地址：http://dcx.sap.com/sa160/fr/dbprogramming/pg-ruby-dbi.html 调用改程序进行查询，出现错误：

/home/sybase/.gem/ruby/gems/dbi-0.4.5/lib/dbi/columninfo.rb:49:in `[]=': can't add a new key into hash during iteration (RuntimeError)
        from /home/sybase/.gem/ruby/gems/dbi-0.4.5/lib/dbi/columninfo.rb:49:in `block in initialize'
        from /home/sybase/.gem/ruby/gems/dbi-0.4.5/lib/dbi/columninfo.rb:42:in `each_key'
        from /home/sybase/.gem/ruby/gems/dbi-0.4.5/lib/dbi/columninfo.rb:42:in `initialize'
        from /home/sybase/.gem/ruby/gems/dbi-0.4.5/lib/dbi/handles/statement.rb:185:in `new'
        from /home/sybase/.gem/ruby/gems/dbi-0.4.5/lib/dbi/handles/statement.rb:185:in `block in column_info'
        from /home/sybase/.gem/ruby/gems/dbi-0.4.5/lib/dbi/handles/statement.rb:185:in `collect'
        from /home/sybase/.gem/ruby/gems/dbi-0.4.5/lib/dbi/handles/statement.rb:185:in `column_info'
        from Conn2IQ3.rb:29:in `db_select'
        from Conn2IQ3.rb:59:in `<main>'

这是什么原因？

Ruby 利用 sqlanywhere 连接 MySQL

jpwangluo — Mon, 14 Dec 2015 20:14:52 +0800

各位大侠，ruby 如何利用 SQLanywhere 连接 mysql 数据库，那句连接语句该怎么写。试了几遍有好几种错误，其中一种如下： Connection error: Timeout occurred while waiting for connection response (DBI::DatabaseError) 这是什么原因

jpwangluo (jpwangluo)

错误：can't add a new key into hash during iteration (RuntimeError)

Ruby 利用 sqlanywhere 连接 MySQL