Ruby calls the OfficeJet engine to compress the access database

To meet the business needs of an organization, a server is built for data storage. Because the data stream is small, the access database is used as the database. It was okay at first, but later I found a problem with the access database, that is, the tablespace will become larger and larger as it is used, even if there is no data in the table. Because the content stored in a table at a time is very small, it will be deleted every few minutes and then

To meet the business needs of an organization, a server is built for data storage. Because the data stream is small, the access database is used as the database. It was okay at first, but later I found a problem with the access database, that is, the tablespace will become larger and larger as it is used, even if there is no data in the table. Because the content stored in a table at a time is very small, it will be deleted every few minutes and then

To meet the business needs of an organization, a server is built for data storage. Because the data stream is small, the access database is used as the database. It was okay at first, but later I found a problem with the access database, that is, the tablespace will become larger and larger as it is used, even if there is no data in the table. Because the content stored in a table at a time is very small, it will be deleted every few minutes and then written, so the table will become larger and larger!

Originally, it was a compression software written in VB. Because it was M $'s own language, it naturally had good support for the Office series. Later, it was found that ruby could also access the Jet engine through Win32ole, why not use ruby? This is because the previous code was used by the magic horse class, which is slightly exaggerated, but the effect is good.

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