require 'win32ole'
conn = WIN32OLE.new('ADODB.Connection')
strCnxn="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=f:\\My Documents\\db1.mdb;Persist Security Info=False"
conn.Open strCnxn
rsCustomers = WIN32OLE.new("ADODB.Recordset")
strSQLCustomers = "select * from test1"
rsCustomers =conn.execute(strSQLCustomers)
rsCustomers.MoveFirst()
print "test#{rsCustomers.Fields}"
puts rsCustomers.Fields.item('test').value # field value
puts rsCustomers.Fields.item('test').name #field name
puts rsCustomers.Fields.Count
2009年1月20日星期二
ruby module include , class send
in rails's codes there is a wondful use of ruby module,just see following codes:
Notes:
A couple of points about the include statement before we go on. First, it has nothing to do with files. C programmers use a preprocessor directive called #include to insert the contents of one file into another during compilation. The Ruby include statement simply makes a reference to a named module. If that module is in a separate file, you must use require to drag that file in before using include. Second, a Ruby include does not simply copy the module's instance methods into the class. Instead, it makes a reference from the class to the included module. If multiple classes include that module, they'll all point to the same thing. If you change the definition of a method within a module, even while your program is running, all classes that include that module will exhibit the new behavior.[Of course, we're speaking only of methods here. Instance variables are always per-object, for example.]
References : http://www.rubycentral.com/pickaxe/tut_modules.html
another words:
The extend method will mix a module’s methods at the class level. The method defined in the Math module can be used as a class/static method.
The include method will mix a module’s methods at the instance level, meaning that the methods will become instance methods.
http://www.juixe.com/techknow/index.php/2006/06/15/mixins-in-ruby/
module MyTools
def run(*args)
puts "let #{args.join(' ')} run"
end
end
class Klass
def hello(*args)
"Hello " + args.join(' ')
end
end
class TryTools
#include MyTools
def initialize()
self.class.send :include,MyTools
end
end
k = Klass.new
k.send :hello, "gentle", "readers" #=> "Hello gentle readers"
c=TryTools.new
c.run("me")
Notes:
A couple of points about the include statement before we go on. First, it has nothing to do with files. C programmers use a preprocessor directive called #include to insert the contents of one file into another during compilation. The Ruby include statement simply makes a reference to a named module. If that module is in a separate file, you must use require to drag that file in before using include. Second, a Ruby include does not simply copy the module's instance methods into the class. Instead, it makes a reference from the class to the included module. If multiple classes include that module, they'll all point to the same thing. If you change the definition of a method within a module, even while your program is running, all classes that include that module will exhibit the new behavior.[Of course, we're speaking only of methods here. Instance variables are always per-object, for example.]
References : http://www.rubycentral.com/pickaxe/tut_modules.html
another words:
The extend method will mix a module’s methods at the class level. The method defined in the Math module can be used as a class/static method.
The include method will mix a module’s methods at the instance level, meaning that the methods will become instance methods.
http://www.juixe.com/techknow/index.php/2006/06/15/mixins-in-ruby/
2009年1月5日星期一
Debugging Ruby and ROR
1,install rdebug, sudo gem install ruby-debug
2,command line for debugging ruby file , rdebug rubyscript.rb
3,tips for debugging rails app , insert 'debugger' statement into your code where the code you want to check
4,run ./script/server --debugger,then the app will trap into rdebug when execution flow encounters the 'debugger' statement.
2,command line for debugging ruby file , rdebug rubyscript.rb
3,tips for debugging rails app , insert 'debugger' statement into your code where the code you want to check
4,run ./script/server --debugger,then the app will trap into rdebug when execution flow encounters the 'debugger' statement.
2008年12月30日星期二
Ruby dynamic syntax checking
From the file sample/test.rb in the Ruby source code distribution:
def valid_syntax?(code, fname)
eval("BEGIN {return true}\n#{code}", nil, fname, 0)
rescue Exception
puts $!.message
false
end
original post: http://groups.google.com/group/comp.lang.ruby/browse_thread/thread/1efc85a01ab278f4?pli=1
def valid_syntax?(code, fname)
eval("BEGIN {return true}\n#{code}", nil, fname, 0)
rescue Exception
puts $!.message
false
end
original post: http://groups.google.com/group/comp.lang.ruby/browse_thread/thread/1efc85a01ab278f4?pli=1
Ruby syntax checking
Ruby -T way for checking ruby script like perl stict mode( maybe like ^_^)
sorry,it's wrong .
sorry,it's wrong .
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