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RubyµÄselfÓкÍJavaµÄthisÏàËÆÖ®´¦£¬µ«ÓÖ´ó²»Ïàͬ¡£JavaµÄ·½·¨¶¼ÊÇÔÚʵÀý·½·¨ÖÐÒýÓã¬ËùÒÔthisÒ»°ã¶¼ÊÇÖ¸Ïòµ±Ç°¶ÔÏóµÄ¡£¶øRubyµÄ´úÂëÖðÐÐÖ´ÐУ¬ËùÒÔÔÚ²»Í¬µÄÉÏÏÂÎÄ(context)self¾ÍÓÐÁ˲»Í¬µÄº¬Ò壬ÏÈÀ´¿´¿´³£¼ûµÄcontext self¶¼´ú±íÄÄЩ
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# Õâ¸öλÖÃλÓÚtop level context£¬´ú±íObjectµÄĬÈ϶ÔÏómain
p self # => main
p self.class # => Object
@self1 = self
# ÒòΪËùÓÐ×Ô¶¨ÒåÀ඼λÓÚmain contextÖ®ÖУ¬ËùÒÔÕâÊÇObjectµÄʵÀý·½·¨
# ͬʱҲ¿ÉÒÔ˵ÊÇÒ»¸öÈ«¾Ö·½·¨
def a_method
@self2 = self
p self
# => main£¬ÒòΪÓÐÁËʵÀý±äÁ¿@self1ºÍ@self2£¬ËùÒÔ´òÓ¡³öÀ´µÄ²»ÊÇmainÕâ¸ö×Ö·û
# => µ«ÈÔÈ»ÊÇmain¶ÔÏó£¬×¢Ê͵ô4£¬8Ðм´¿É¿´µ½Ð§¹û
p @self1 == @self2 # => true
end
# ÏÂÃæÊÇÒ»¸ö¹ØÓÚÀàÖв»Í¬ÉÏÏÂÎĵÄself
class Person
p self # => Person£¬´ú±íµ±Ç°Àà
def instance_method
p self # => #<Person:0xb7818fdc>£¬´ú±íµ±Ç°ÀàµÄʵÀý
end
def self.class_method
p self # => Person£¬ºÍµÚ16ÐÐÒ»Ñù´ú±íµ±Ç°ÀࣨÕâÊÇÀà·½·¨µÄcontext£©£¬ËüÃÇÊÇÏàµÈµÄ
end
end
m = Person.new
def m.hello
p self # => ´ú±ímÕâ¸öµ¥Àý¶ÔÏó
end
m.hello
ÉÏÃæֻдÁËÔÚÀàÖеÄself£¬ÆäʵÔÚmoduleÒ²ÊÇÒ»ÑùµÄ¡£Í¨¹ýÉÏÃæ´úÂëÄã¿ÉÒÔ·¢ÏÖ£¬selfÒ»Ö±ÒýÓÃ×ÅËüËùÔÚλÖÃÉÏÏÂÎĵÄʵÀý/Àà¡£
selfÏÔʽ/Òþʽ
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class Person
attr_accessor :name
def set_name(your_name)
name = your_name
end
end
m = Person.new
p m.name
m.set_name('today')
p m.name # => ²ÂÊÇʲô
Èç¹ûÄã²ÂÊÇtoday¾Í´ó´íÌØ´íÁË£¬´ð°¸ÊÇnil£¬ÎªÊ²Ã´ÊÇnilÄØ£¬ÔÚµÚ5ÐУ¬ÎÒÃ÷Ã÷µ÷ÓõÄÊÇattr_accessorÉú³ÉµÄname=·½·¨¸³ÖµµÄ°¡£¬Äã¿ÉÒÔÔÚÇ°Ãæ¼ÓÉÏselfÊÔÊÔ£¬´úÂëÈçÄãÔ¤ÆÚµÄÒ»ÑùÖ´ÐÐÁË¡£ÔÚÕâÖÖÇé¿öÏÂname = your_name²¢Ã»ÓÐÈ¥µ÷ÓÃattr_accessorÉú³ÉµÄxx=·½·¨£¬¶øÊǽ«nameµ±×÷ÁËÒ»¸ö¾Ö²¿±äÁ¿£¬Èç¹ûÏÔʽµÄÖ¸¶¨self£¬¾ÍûÓÐÎÊÌâÁ
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To get it done is not easy. I spent a whole day to figure out the various compatibility issues along the way out.
Now there still might be potential issues, but it works by my rough test.
Step 1: Install Apache Cassandra
You may know that the Ruby gem cassandra will do it for you.
  ......
The following is improved version of the code created by David Mullet, from
http://rubyonwindows.blogspot.com/2007/03/ruby-ado-and-sqlserver.html
require 'win32ole'
class SqlServer
# This class manages database connection and queries
attr_accessor :connection, :data, :fields
attr_wr ......
×î½üÓÉÓÚѧϰʹÓÃlinuxϵÄC¿ª·¢£¬ÐèÒª²éѯLinux Cº¯Êý²Î¿¼£¬¾Í¾³£ÉÏhttp://man.chinaunix.net/develop/c&c++/linux_c/default.htm²é¿´£¬ÃèÊöµÃ±È½ÏÏêϸ¶øÇÒ»¹ÓÐÀý×Ó¡£
ÍøÉÏ»¹ÓÐÐí¶à¸÷ÖÖ¼¼ÊõµÄÍøÒ³¸ñʽµÄ²Î¿¼²ÄÁ϶¼·Ç³£Ç¿´ó£¬¿ÉϧºÜ¶àʱºò¶¼Ã»ÓÐÍø¡£ÓÚÊǾÍÏëд¸ö½Å±¾¿ÉÒÔ°ÑÎĵµÏÂÔØ£¬Ïñandroid¿ª·¢ÕßÎĵµÒ»ÑùŪµ½±¾µØ ......
ת Adding Sound to Your Ruby Apps
Have you ever thought about including sounds in your Ruby application? Used sparingly, sound may enhance your applications by adding audio cues or a custom touch. You could, for example, play a beep or chime that announces the completion of a lengthy process. Per ......