ruby调用Office Jet引擎压缩access数据库

    由于单位业务需要,搭建一台服务器专门用来做数据存储。因为数据流很小,遂采用access库作为DB。开始还好,但是后来发现access数据库有一问题,就是表空间会随着使用越来越大,哪怕表里没有数据。因为表中单次存放的内容是很小的,每隔几分钟会全删除然后再写入,所以表也会越来越大啊!

    开始是用VB写的一个压缩软件,因为是M$自家的语言嘛,自然对Office系列支持很好,后来发现ruby中也可以通过Win32ole访问Jet引擎,为何不用ruby来写呢?因为是以前写的代码神马都用class来搞,稍显夸大,但效果还好。

#hb table write by hopy 2012 
require 'win32ole'
require 'oci8'

class Hb
  def initialize
    @oci = OCI8.new("xxx","***","xxx")
  end
  
  def open
    unless @acs
      conn_str = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=#{Dir.pwd}/hb.mdb"
      #conn_str = "driver={SQL Server};database=xxx;server=localhost,1433;uid=sa;pwd=sa"
      @acs = WIN32OLE.new('ADODB.Connection')
      @acs.Open(conn_str)
    end
  end
  
  def close
    (@acs.Close;@acs=nil) if @acs
  end
  
  def cls
    self.open
    sql = "DELETE * from InTable";@acs.Execute(sql)
    sql = "DELETE * from OutTable";@acs.Execute(sql)
  end
  
  def zip
    start = Time.now
    self.close
    jet = WIN32OLE.new('JRO.JetEngine')
    path = Dir.pwd+"/hb.mdb"
    new_path=Dir.pwd+"/hb_ziped.mdb"
    File.delete(new_path) if File.exist?(new_path)
    sp = "Provider=Microsoft.Jet.OLEDB.4.0"
    ss = sp+";Data Source="+path
    sd = sp+";Data Source="+new_path
    jet.CompactDatabase(ss,sd)
    File.delete(path)
    File.rename(new_path,path)
    puts "access ziped , take #{Time.now - start} s"
  end
  
  def sync
    self.cls
    self.open
    
    zb = [64981,57520]
    
    i = 0;start = Time.now
    ret = @oci.exec('select * from DBO.DPXS_ARRIVAL') do |r|
      next if r[7].unpack("v*") != zb
      
      zt = if r[24] == "Arrived" 
        r[23]
      elsif r[25]
        r[25]
      else
        r[23]
      end
      
      tm = if r[12]
        r[12]
      elsif r[11]
        r[11]
      else
        r[10]
      end
      
      @acs.Execute("INSERT INTO InTable VALUES('#{r[0]}','#{tm}','#{r[13]}','#{zt}')");i+=1
    end
    <span style="white-space:pre">	</span>puts "sync #{i} arrival flights , take #{Time.now - start} s"
    
    i = 0;start = Time.now
    ret = @oci.exec('select * from DBO.DPXS_DEPARTURE') do |r|
      next if r[7].unpack("v*") != zb
      
      tm = if r[13]
        r[13]
      elsif r[12]
        r[12]
      else
        r[11]
      end
      
      @acs.Execute("INSERT INTO OutTable VALUES('#{r[0]}','#{tm}','#{r[14]}','#{r[27]}')");i+=1
    end
    puts "sync #{i} departure flights , take #{Time.now - start} s"
  end
end

INTERVAL_sec = 10
hb = Hb.new
t = 0
loop do 
  sleep(INTERVAL_sec);t+=INTERVAL_sec
  hb.sync
  (hb.zip;t=0) if t >= 60
  #t=0 if t >= 60
end


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