ruby文件夹 *** 作

一、新建文件

f=File.new(File.join("C:","Test.txt"), "w+")

f.puts("I am Jack")

f.puts("Hello World")

文件模式

"r" ：Read-only. Starts at beginning of file (default mode).

"r+" ：Read-write. Starts at beginning of file.

"w" ：Write-only. Truncates existing file to zero length or creates a new file for writing.

"w+" ：Read-write. Truncates existing file to zero length or creates a new file for reading and writing.

"a" ：Write-only. Starts at end of file if file existsotherwise, creates a new file for writing.

"a+" ：Read-write. Starts at end of file if file existsotherwise, creates a new file for reading and writing.

"b"局伍 ：(DOS/Windows only.) Binary file mode. May appear with any of the key letters listed above

二、读取文件

file=File.open(File.join("C:","Test.txt"),"r")

file.each { |line| print "#{file.lineno}.", line }

file.close

三、新建、删除、重命名文件

File.new( "books.txt", "w" )

File.rename( "books.txt", "chaps.txt" )

File.delete( "chaps.txt" )

四、目录 *** 作

1     创建目录

Dir.mkdir("c:/testdir")

04     #删除目录

05     Dir.rmdir("c:/testdir")

07     #查询目录里的文件

08     p Dir.entries(File.join("C:","Ruby")).join(' ')

10     #遍历目录

11     Dir.entries(File.join("C:","Ruby")).each {

|e| puts e

}

1、ARGV and ARGF

ARGV

ARGV <<"cnblogslink.txt"

#The gets method is a Kernel method that gets lines from ARGV

print while gets

p ARGV.class

ARGF

while line = ARGF.gets

print line

end

2、文件信息桐桐或查询

#文件轮戚是否存在

p File::exists?( "cnblogslink.txt" ) # =>true

#是否是文件

p File.file?( "cnblogslink.txt" ) # =>true

#是否是目录

p File::directory?( "c:/ruby" ) # =>true

p File::directory?( "cnblogslink.txt" ) # =>false

#文件权限

p File.readable?( "cnblogslink.txt" ) # =>true

p File.writable?( "cnblogslink.txt" ) # =>true

p File.executable?( "cnblogslink.txt" ) # =>false

#是否是零长度

p File.zero?( "cnblogslink.txt" ) # =>false

#文件大小 bytes

p File.size?( "cnblogslink.txt" ) # =>74

p File.size( "cnblogslink.txt" ) # =>74

#文件或文件夹

p File::ftype( "cnblogslink.txt" ) # =>"file"

#文件创建、修改、最后一次存取时间

p File::ctime( "cnblogslink.txt" ) # =>Sat Sep 19 08:05:07 +0800 2009

p File::mtime( "cnblogslink.txt" ) # =>Sat Sep 19 08:06:34 +0800 2009

p File::atime( "cnblogslink.txt" ) # =>Sat Sep 19 08:05:07 +0800 2009

3、查找文件

puts "查找目录下所有文件及文件夹"

Dir["c:/ruby/*"].each {|x|

puts x

}

puts "条件查询"

Dir.foreach('c:/ruby') {

|x| puts x if x != "." &&x != ".."

}

puts "查找某一类型文件"

Dir["*.rb"].each {|x|

puts x

}

puts "Open 查询"

Dir.open('c:/ruby') { |d| d.grep /l/ }.each{|x| puts x}

puts "---------------------------"

puts "正则表达式查询"

Dir["c:/ruby/ruby/[rs]*"].each{|x| puts x}

puts "------------------------"

Dir["c:/ruby/[^s]*"].each{|x| puts x}

puts "------------------------"

Dir["c:/ruby/{ruby,li}*"].each{|x| puts x}

puts "------------------------"

Dir["c:/ruby/?b*"].each{|x| puts x}

puts "查找目录及子目录的文件"

require 'find'

Find.find('./') { |path| puts path }

3、查询目录及子目录文件

require "find"

Find.find("/etc/passwd", "/var/spool/lp1", ".") do |f|

Find.prune if f == "."

puts f

end

原型：ref.find( [ aName ]* ) {| aFileName | block }

prune：Skips the current file or directory, restarting the loop with the next entry. If the current file is a directory, that directory will not be recursively entered. Meaningful only within the block associated with Find::find.

4、文件比较 复制等

require 'ftools'

File.copy 'testfile', 'testfile1'  » true

File.compare 'testfile', 'testfile1'  » true

直接写入数据库就好了，写一个读写物歼mysql的类文件接口，然后调用 *** 作。具体如下，我调试过的。

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

require 'mysql'

class MysqlDb

# attr_accessor :host, :user, :pass, :database

def open(host=nil, user=nil, pass=nil, database=nil,port=3306)

@host =host

@user = user

@pass = pass

@database = database

@port = port

begin

@connection = Mysql.new(@host, @user, @pass, @database, @port)

rescue

puts "connect faild! an error has occurred: #{$!}" # 错误信息保存在特殊变量$!中。

try_again

end

end

def try_again

puts '------------------try again, if not modify, leave a blank---------------'

print "host: "

host=STDIN.gets.strip

@host = check_value(host,@host)

puts "---------------current host: #{@host}"

print "user: "

user =STDIN.gets.strip

@user = check_value(user,@user)

puts "---------------current user: #{@user}"

print "password: "

pass =STDIN.gets.strip

@pass = check_value(pass,@pass)

puts "---------------current password: #{@pass}"

print "database: "罩闭冲

database =STDIN.gets.strip

@database = check_value(database,@database)

puts "---------------current database: #{@database}"

print "port: "

port =STDIN.gets.strip

@port = check_value(port,@port)

open(@host, @user, @pass, @database, @port)

puts "---------------current port: #{@port}"

end

def check_value(value,returnvalue)

if value == ""

nil

else

returnvalue = value

end

return returnvalue

end

def iquery(sql)

field = []

@connection.query(sql).each do |data|

field <<data

end

field.to_a

end

def iexecute(sql)

@connection.query(sql)

end

def close

@connection.close

end

end

# useages

adb = MysqlDb.new

adb.open('127.0.0.1'态橡,'root','zyq001122','hello_z','3307')

# result = db.query "insert into user value(7,\"lilY\",\"256y42\",\"#{Time.now.strftime("%Y-%m-%d %H:%M:%S")}\" )" # 插入记录

# result.each {|row| puts row}

num_of_records = adb.iquery ('select count(*) from user') #查询

puts num_of_records

#sql = "insert into user value(10,\"Hello-Kitty\",\"256y42\",\"#{Time.now.strftime("%Y-%m-%d %H:%M:%S")}\" )"# 数据 *** 作

# sql = 'update user set name=\'jackjhons\' where uid=5 ' # 更新一条记录

#adb.iexecute(sql)

# adb.close

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