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ivaneeo — Tue, 18 Nov 2014 10:23:00 GMT

http://redminecrm.com/pages/vmware_image

ivaneeo 2014-11-18 18:23 发表评论

jruby jdbc�q�接oracle

ivaneeo — Wed, 22 Apr 2009 06:50:00 GMT

require 'java'

import 'oracle.jdbc.driver.OracleDriver'

module JavaLang

include_package "java.lang"

end

module JavaSql

include_package "java.sql"

end

#JavaLang::Class.forName("oracle.jdbc.driver.OracleDriver").newInstance

##发现如果直接用Class.forName话根本找不到�c�R��看来jruby是预先导入的直接用import CLASS卛_��

con =

JavaSql::DriverManager.getConnection( \

"jdbc:oracle:thin:@132.228.129.104:1521:ods","ods","ods")

sql = con.createStatement()

result = sql.executeQuery("select * from dual")

while result.next

puts result.getString(1)

end

ivaneeo 2009-04-22 14:50 发表评论

rdoc地址集合

ivaneeo — Mon, 20 Nov 2006 09:44:00 GMT

1.ruby
    http://www.ruby-doc.org/core/
    代理讉K��:http://anonymouse.org/cgi-bin/anon-www.cgi/http://www.ruby-doc.org/core/

    http://www.ruby-doc.org/stdlib/
2.rmagick
    http://studio.imagemagick.org/RMagick/doc/index.html

3.gemjack.com集合的大多数rdoc(推荐!)
    http://gemjack.com/

ivaneeo 2006-11-20 17:44 发表评论

dbi如何操作blob

ivaneeo — Mon, 20 Nov 2006 09:38:00 GMT

mysql和oracle存储囄��文�g都是用blob�c�d��,但是ruby怎么处理的呢?
ruby�q�是把它当作字符�?但是要经�q�加�?

我们完全可以使用rmagick�q�个囑�Ş库来�q�行.

代码:
    require 'rubygems'
    require_gem 'rmagick'
    include Magick

    DBI.connect('DBI:Mysql:test_dbo:192.168.0.164', 'mysql', '') { |dbh|
     dbh.execute 'SET NAMES utf8'
       1.upto(13) { |i|
    str = "insert into users(name, pwd, img) values(?,?,?)"
     dbh.prepare(str) { |st|
jpg = Image.read('1.jpg').first
st.execute('a', 'b', jpg.to_blob)
}
}
}

如果从数据库反响出来,也类�?from_blob�Ҏ��)

ivaneeo 2006-11-20 17:38 发表评论

ivaneeo — Mon, 20 Nov 2006 06:28:00 GMT

首先创徏�?我们�q�里默认�~�码utf8:

create table samples (

    id int not null auto_increment,
    foo varchar(100) not null,
    bar text not null,
    primary key (id)
) Type=MyISAM CHARACTER SET utf8;


�q�里创徏表类型时要��用MyISAM�c�d��,因�ؓ只有MyISAM�c�d��才支持完整的utf8.最后设�|�编码utf8.

1.dbi操作数据�?br />	如果你本地编码时gbk的话,首先要默认类Iconv�q�行转换.
		require 'iconv'
		def gb2u str
			conv = Iconv.new("UTF-8", "GBK")
			str = conv.iconv(str)
			str << conv.iconv(nil)
			conv.close

			str
		end

	插入代码:
		DBI.connect('DBI:Mysql:test:localhost', 'mysql', '') { |dbh|
	 		dbh.execute 'SET NAMES utf8'  #�q�里要指明代�?br />     			1.upto(13) { |i|
	  			st.execute("insert into samples(foo, bar) values('#{gb2u('一')}#{i}', '#{gb2u('�?)}')")
	  		}
     		}



2.activerecord
	activerecord是对dbi的包�?(也更��?呵呵!)
	代码:
		require     'rubygems'
		require_gem 'activerecord' #因�ؓ我是gem的安�?br />
		ActiveRecord::Base.establish_connection(
			:adapter =>  "mysql",
			:host     => "localhost",
			:database => "test",
			:username => "mysql",
			:password => "",
			:encoding => "utf8") #�~�码只需�q�里指明

		#指明�?br />		class Mytab < ActiveRecord::Base
			set_table_name 'samples'
		end

		#插入数据
		tab = Mytab.new
		tab.foo= gb2u('一')
		tab.bar = gb2u('�?)
		tab.save

		#查询数据
		data = Mytab.find(:all)
		data.each { |line| 
			puts "['#{line[:id]}', '#{line[:foo]}, '#{line[:bar]}]" 
		}

ivaneeo 2006-11-20 14:28 发表评论

ivaneeo — Fri, 17 Nov 2006 16:33:00 GMT

看rrobots的一个简单的例子:

----------------------- code -----------------------
require 'robot'

class NervousDuck
   include Robot

def tick events
    turn_radar 1 if time == 0
    turn_gun 30 if time < 3
    accelerate 1
    turn 2
    fire 3 unless events['robot_scanned'].empty?
end
end

----------------------- code -----------------------

�q�里臛_��要实现tick�Ҏ��.

下面是控制robot的一些方法和属�?

battlefield_height #the height of the battlefield
battlefield_width   #the width of the battlefield
energy              #your remaining energy (if this drops below 0 you are dead)
gun_heading         #the heading of your gun, 0 pointing east, 90 pointing
                      #north, 180 pointing west, 270 pointing south
gun_heat            #your gun heat, if this is above 0 you can't shoot
heading             #your robots heading, 0 pointing east, 90 pointing north,
                      #180 pointing west, 270 pointing south
size                #your robots radius, if x <= size you hit the left wall
radar_heading       #the heading of your radar, 0 pointing east,
                      #90 pointing north, 180 pointing west, 270 pointing south
time                #ticks since match start
speed               #your speed (-8/8)
x                   #your x coordinate, 0...battlefield_width
y                   #your y coordinate, 0...battlefield_height
accelerate(param)   #accelerate (max speed is 8, max accelerate is 1/-1,
                      #negativ speed means moving backwards)
stop                #accelerates negativ if moving forward (and vice versa),
                      #may take 8 ticks to stop (and you have to call it every tick)
fire(power)         #fires a bullet in the direction of your gun,
                      #power is 0.1 - 3, this power will heat your gun
turn(degrees)       #turns the robot (and the gun and the radar),
                      #max 10 degrees per tick
turn_gun(degrees)   #turns the gun (and the radar), max 30 degrees per tick
turn_radar(degrees) #turns the radar, max 60 degrees per tick
dead                #true if you are dead
say(msg)            #shows msg above the robot on screen
broadcast(msg)      #broadcasts msg to all bots (they recieve 'broadcasts'
                      #events with the msg and rough direction)

ivaneeo 2006-11-18 00:33 发表评论

ivaneeo — Tue, 07 Nov 2006 13:12:00 GMT

				1。gem query --remote        # shortcut: gem q -R
#列出所有包
2。gem query --remote --name-matches doom
  # shortcut: gem q -R -n doom
#列出所有名字匹配的�?br />3。gem install --remote progressbar
# shortcut: gem i -r progressbar
#安装指定名字的包�?br />gem ins -r progressbar --version '> 0.0.1' #�q�里可以匚w��版本
4。gem specification  progressbar
# shortcut: gem spec progressbar
#查看安装�q�的指定包详�l�信�?br />5�?code>gem uninstall progressbar
#卸蝲�?br />6。gem query --local
# shortcut: 'gem q -L'
#列出所有本地安装过的包
7�?code>gem ins rake
#在本地安装，如果没有�q�程安装
8�?code>gem list -b ^C
#列出所有以C开头的�?br />9�?code>gem_server
开启rdoc服务。可以查看安装包的rdoc

ivaneeo 2006-11-07 21:12 发表评论

ruby code example(14)

ivaneeo — Tue, 12 Sep 2006 08:33:00 GMT

class Song
include Comparable ##include�?code>extend有什么不同？

                                     ##include负责��?code>module插入到类(模块)中，�q�样��p��以函数的形式来调用方法；�?code>extend负责��?code>module插入到对�?实例)中，�q�样��添加了�Ҏ��Ҏ��?br />
    @@plays = 0            ##�c�d��量，必须初始�?br />    attr_reader :name, :artist, :duration   ##分别为@name,@artist,@duration讄��可读的属�?br />    attr_writer :duration                           ##对@duration讄��可写的属�?br />

    def initialize(name, artist, duration)
    	@name     = name
   	@artist   = artist
    	@duration = duration

	@plays    = 0		##对象变量
    end

    def to_s
    	"Song: #@name--#@artist (#@duration)"
    end

  def name	##函数式的公开所有变�?br />    @name
  end
  def artist
    @artist
  end
  def duration
    @duration
  end

ivaneeo 2006-09-12 16:33 发表评论

ruby code example(13)

ivaneeo — Tue, 12 Sep 2006 08:07:00 GMT

while gets
  if /Ruby/
    print
  end
end

##�{�同代码

 ARGF.each {|line|  print line  if line =~ /Ruby/ }
##ARGF
##An object providing access to virtual concatenation of files passed as command-line
##arguments or standard input if there are no command-line arguments. A synonym for
##$<.

##�{�同代码
print ARGF.grep(/Ruby/)

ivaneeo 2006-09-12 16:07 发表评论

ruby code example(12)

ivaneeo — Tue, 12 Sep 2006 07:59:00 GMT

##闭包的常见用�? 
[ 'cat', 'dog', 'horse' ].each {|name| print name, " " }
  5.times {  print "*" }
  3.upto(6) {|i|  print i }	##3..6又一写法
  ('a'..'e').each {|char| print char }

##输出函数的格式字�W�串
printf("Number: %5.2f,\nString: %s\n", 1.23, "hello")

ivaneeo 2006-09-12 15:59 发表评论

ruby code example(11)

ivaneeo — Tue, 12 Sep 2006 07:52:00 GMT

#############################################
##闭包的一个用�?br />  animals = %w( ant bee cat dog elk )    # create an array
  animals.each {|animal| puts animal }   # iterate over the contents


#############################################

  def call_block
    puts "Start of method"
    yield					##执行传入的参�?�q�里�?In the block"
    yield
    puts "End of method"
  end

  call_block { puts "In the block" }

##############################################

ivaneeo 2006-09-12 15:52 发表评论

ruby code example(10)

ivaneeo — Tue, 12 Sep 2006 07:49:00 GMT

##块的用法
 { puts "Hello" }       # this is a block

  do                     ###
    club.enroll(person)    # and so is this
    person.socialize       #
  end                    ###

ivaneeo 2006-09-12 15:49 发表评论

ruby code example(9)

ivaneeo — Tue, 12 Sep 2006 07:29:00 GMT

line = "abc"
if line =~ /Perl|Python/	##匚w��正则表达�?br />    puts "Scripting language mentioned: #{line}" 
end


  line.sub(/Perl/, 'Ruby')    # replace first 'Perl' with 'Ruby'
  line.gsub(/Python/, 'Ruby') # replace every 'Python' with 'Ruby'

ivaneeo 2006-09-12 15:29 发表评论

ruby code example(8)

ivaneeo — Tue, 12 Sep 2006 07:22:00 GMT

  histogram = Hash.new(0)	##�l�hash表设�|�默然��gؓ0
  histogram['key1']
  histogram['key1'] = histogram['key1'] + 1
  histogram['key1']

######################################
##gets 从命令行出入的文件名得到的文件的每一行文本�?br />while line = gets
  puts line.downcase	##downcase全部转换成小�?br />end

ivaneeo 2006-09-12 15:22 发表评论

ruby code example(7)

ivaneeo — Tue, 12 Sep 2006 07:10:00 GMT

##数组
a = [ 'ant', 'bee', 'cat', 'dog', 'elk' ]
  a[0]
  a[3]
# this is the same:
  a = %w{ ant bee cat dog elk }
  a[0]
  a[3]

##hash�?br /> inst_section = {
    'cello'     => 'string',
    'clarinet'  => 'woodwind',
    'drum'      => 'percussion',
    'oboe'      => 'woodwind',
    'trumpet'   => 'brass',
    'violin'    => 'string'
  }

  inst_section['oboe']
  inst_section['cello']
  inst_section['bassoon']

ivaneeo 2006-09-12 15:10 发表评论

ruby code example(6)

ivaneeo — Tue, 12 Sep 2006 07:07:00 GMT

 a = [ 1, 'cat', 3.14 ]   # array with three elements
  # access the first element
  a[0]
  # set the third element
  a[2] = nil
  # dump out the array
  a

ivaneeo 2006-09-12 15:07 发表评论

ruby code example(5)

ivaneeo — Tue, 12 Sep 2006 07:05:00 GMT

  def say_goodnight(name)
    result = "Good night, #{name}"	##把变量name的值替换进字符�?ruby使用#{var}.
    return result
  end
  puts say_goodnight('Pa')
##########################################################

  def say_goodnight(name)
    result = "Good night, #{name.capitalize}" ##s.capitalize �W�一个子母变为大�?br />								      ##s.capitalize!
							              ##Returns a copy of s with the first character converted to uppercase and the remainder to lowercase.
								      ##"fooBar".capitalize # => "Foobar"
  return result
  end
  puts say_goodnight('uncle')

##########################################################

$greeting = "Hello"        # $greeting is a global variable
@name     = "Prudence"     # @name is an instance variable
puts "#$greeting, #@name"

##########################################################
  def say_goodnight(name)	##不用使用return语句也可以返�?br />    "Good night, #{name}"
  end
  puts say_goodnight('Ma')

ivaneeo 2006-09-12 15:05 发表评论

ruby code example(4)

ivaneeo — Tue, 12 Sep 2006 06:53:00 GMT

 number = -123	#数字都有Math�cȝ���Ҏ��
 number = number.abs

ivaneeo 2006-09-12 14:53 发表评论

ruby code example(3)

ivaneeo — Tue, 12 Sep 2006 06:50:00 GMT

  song = 1
  sam = ""
  def sam.play(a)	#定义�Ҏ��
    "duh dum, da dum de dum ..."
  end

  "gin joint".length	#所有都是以Object为root
  "Rick".index("c")
  -1942.abs
  sam.play(song)

ivaneeo 2006-09-12 14:50 发表评论

ruby code example(2)

ivaneeo — Tue, 12 Sep 2006 06:29:00 GMT

class Song
def initialize(a) #构造函�?br />end
end

song1 = Song.new("Ruby Tuesday")
song2 = Song.new("Enveloped in Python")
# and so on

ivaneeo 2006-09-12 14:29 发表评论

ruby code example(1)

ivaneeo — Tue, 12 Sep 2006 06:27:00 GMT

3.times { puts "Hello!" }

i.times {| i| ...}
Iterates the block i times. ##�q�代一个闭包i��?br />

ivaneeo 2006-09-12 14:27 发表评论

ivaneeo — Tue, 23 Aug 2005 09:06:00 GMT

随着��Z��对动态语�a�兴趣的日益浓厚，��来��多的�h都遇��C��闭包�Q�Closures �Q�和或块�Q�Blocks�Q�等概念。有着C/C++/Java/C#�{�语�a�背景的�h因�ؓ�q�些语言本��n没有闭包�q�个概念�Q�所以可能不太了解闭包。本文将��单的介绍一下闭包的概念�Q�那些有大量支持闭包语言�~�程�l�验的�h也许觉得本文不会太有意思�?

闭包的概念已�l�提出很长时间了。我�W�一�ơ碰到这它是在smalltalk中，那时候还叫做块（blocks�Q�。Lisp语言中用的很多。Ruby中也有同��L��功能�Q�这也是Ruby用户喜欢Ruby的一个原因�?/P>

本质上来��_��一个闭包是一块代码，它们能作为参��C��递给一个方法调用。我��通过一个简单的例子来阐�q�这个观炏V��假设我们有一个包含一些雇员对象的列表�Q�然后我惛_��位�ؓ�l�理的员工，�q�样的员工可以通过IsManager判断。在C#里，我们可能会写��Z��面类似的代码�Q?/P>

  public static IList Managers(IList emps) {
    IList result = new ArrayList();
    foreach(Employee e in emps)
      if (e.IsManager) result.Add(e);
    return result;
  }

在一�U�支持闭包的语言中，比如Ruby�Q�我们可以这样写�Q?/P>

  def managers(emps)
	return emps.select {|e| e.isManager}
  end

select是Ruby中定义的集合�l�构中的一个方法，它接受一个block�Q�也��是闭包�Q�作��Z��个参数。在Ruby中，闭包写在一对大括号中（不止�q�一�U�方法，另一�U��ؓdo .. end�Q�。如果这个块也接受参敎ͼ�你可以将�q�些参数攑ֈ�两个竖线之间。select�Ҏ��循环�q�代�l�定的数�l�，�Ҏ��个元素执行给定的block�Q�然后将每次执行block�q�回true的元素组成一个新的数�l�再�q�回�?/P>

现在�Q�如果你是C�E�序员你也许要想�Q�通过函数指针也可以实玎ͼ�如果你是JAVA�E�序员，你可能回��x��可以用匿名内�c�L��实现�Q�而一个C#者则会想��C��理（delegate�Q�。这些机制和闭包�c�M��Q�但是它们和闭包之间有两个明昑־�区别�?/P>

�W�一个是形式上的不同�Q�The first one is a formal difference�Q�。闭包可以引用它定义时候可见的变量。看看下面的�Ҏ��Q?/P>

def highPaid(emps)
	threshold = 150
	return emps.select {|e| e.salary > threshold}
end

注意select的block代码中引用了在包含它的方法中的局部变量，而其它不支持真正闭包的语�a�使用其它�Ҏ��辑ֈ��c�M��功能的方法则不能�q�样做。闭包还允许你做更有��的事情�Q�比如下面方法：

def paidMore(amount)
	return Proc.new {|e| e.salary > amount}
end

�q�个�Ҏ��q�回一个闭包，实际上它�q�回一个依赖于传给它的参数的闭包。我可以用一个参数创��Z��个这��L��Ҏ��Q�然后再把它赋给另一个变量�?/P>

highPaid = paidMore(150)

变量包含了一�D�代码（在Ruby中是一个Proc对象�Q�，�q�段代码��判断一个对象的salary属性是否大�?50。我们可以这样��用这个方法：

john = Employee.new
john.salary = 200
print highPaid.call(john)

表达�?CODE>调用我之前定义的代码�Q�这时候此代码中的amount已经在创��Ҏ��的时候绑定�ؓ150。即使现在我执行print 的时候，150已经不在它的范围内了�Q�但是amount�?50之间的绑定依然存在�?/P>

所以，闭包的第一个关键点是闭包是一�D�代码加上和定义它的环境之间的绑定（they are a block of code plus the bindings to the environment they came from�Q�。这是闭包和函数指针�{�其它相似技术的不同点（java匿名内类可以讉K��局部变量，但是只有当这些内�c�L��final的时候才行）�?/P>

�W�二个不同点不是定义形式的不同，但是也同样重要。（The second difference is less of a defined formal difference, but is just as important, if not more so in practice�Q�。支持闭包的语言允许你用很少的语法去定义一个闭包，��管�q�点可能不是很重要的一点，但我�怿��q�点是至关重要的�Q�这是��得�h们能很自然的使用闭包的关键点。看看Lisp�Q�Smalltalk和Ruby�Q�闭包遍布各处－比其它语�a�中类似的使用多很多。绑定局部变量是它的特点之一�Q�但我想最大的原因是��用闭包的语法和符号非常简单和清楚�?/P>

一个很好的相关例子是从Smalltalk�E�序员到JAVA�E�序员，开始时很多人，包括我，试验性的��在Smalltalk中��用闭包的地方在Java中��用匿名内�c�L��实现。但�l�果使得代码变得混�ؕ隄��Q�所以我们不得不攑ּ��?/P>

我在Ruby�l�常使用闭包�Q�但我不打算创徏Proc对象�Q�然后传来传厅R��大多数旉��我用闭包来处理前面我提到的select�{�基于集合对象的�Ҏ��。闭包另一个重要用途是'execute around method'�Q�比如处理一个文�Ӟ��

File.open(filename) {|f| doSomethingWithFile(f)}

�q�里open�Ҏ��打开一个文�Ӟ��然后执行�l�定的block�Q�然后关闭它。这样处理非常方便，��其是对事务�Q�要求commit或者rollback�Q�，或者其它的你需要在处理�l�束时候作一些收��֤�理的事情。我在我的xml文档转换中广泛��用这个优炏V�?/P>

闭包的这些用法显然远不如用Lisp语言的�h遇到的多�Q�即使我�Q�在使用没有闭包支持的语�a�的时候，也会惛_��q�些东西。闭包就像一些你�W�一��D��到觉得不怎么��L��东西�Q�但你很快就会喜�Ƣ上它们�?/P>

ivaneeo 2005-08-23 17:06 发表评论