遇到难题，求救啊……

一个bean的源文件，前面还看得懂，后面完全看不懂啊……求高手帮忙注释一下吧
package database.operation;
import java.sql.*;
import java.util.*;
public class RandomQueryBean
{   String databaseName="";             
    String tableName="";                
    int count;                          
    int randomNumber;                   
    StringBuffer randomQueryResult;     
    Connection con;
    Statement sql; 
    ResultSet rs; 
    public RandomQueryBean()
    {  randomQueryResult=new StringBuffer();
       try{  Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
          }
       catch(Exception e){ } 
    }
    public void setDatabaseName(String s)
    {  databaseName=s.trim();
       randomQueryResult=new StringBuffer();
    }
    public String getDatabaseName()
    {  return databaseName;
    }
    public void setTableName(String s)
    {  tableName=s.trim();
       randomQueryResult=new StringBuffer(); 
    }
    public String getTableName()
    {  return tableName;
    }
    public void setRandomNumber(int n)
    {  randomNumber=n;
       randomQueryResult=new StringBuffer(); 
    }
    public int getRandomNumber()
    {  return randomNumber;
    }
    public int getCount()
    { try{  String uri="jdbc:sqlserver://127.0.0.1:1433;DatabaseName="+databaseName;
           con=DriverManager.getConnection(uri,"sa","sa");
           sql= con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
                                    ResultSet.CONCUR_READ_ONLY);
           rs=sql.executeQuery("SELECT * FROM "+tableName);
           rs.last();
           count=rs.getRow();
           con.close();
          }
        catch(SQLException exp)
          { count=-1;
          }
       return count;
    } 
    public StringBuffer getRandomQueryResult()
    {  randomQueryResult=new StringBuffer();
       try { randomQueryResult.append("<table border=1>");
            String uri= "jdbc:sqlserver://127.0.0.1:1433;DatabaseName="+databaseName;
            con=DriverManager.getConnection(uri,"sa","sa");
            DatabaseMetaData metadata=con.getMetaData();
            ResultSet rs1=metadata.getColumns(null,null,tableName,null);
            int 字段个数=0;
            randomQueryResult.append("<tr>");
            while(rs1.next())
             { 字段个数++;
               String clumnName=rs1.getString(4);
               randomQueryResult.append("<td>"+clumnName+"</td>");
             }
            randomQueryResult.append("</tr>");
            sql=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
                                    ResultSet.CONCUR_READ_ONLY);
            rs=sql.executeQuery("SELECT * FROM "+tableName);
            rs.last();
            count=rs.getRow(); 
            Vector<Integer> vector=new Vector<Integer>();
            for(int i=1;i<=count;i++)
            {  vector.add(new Integer(i));
            }
           int 抽取数目=Math.min(randomNumber,count);
           while(抽取数目>0)
           {  int i=(int)(Math.random()*vector.size());
              int index=(vector.elementAt(i)).intValue();
              rs.absolute(index);                       
              randomQueryResult.append("<tr>");
              for(int k=1;k<=字段个数;k++) 
                 {  randomQueryResult.append("<td>"+rs.getString(k)+"</td>");
                 }
              randomQueryResult.append("</tr>");
              抽取数目--; 
              vector.removeElementAt(i);  
            }
            randomQueryResult.append("</table>");
            con.close();
           }
       catch(SQLException e){ }
       randomNumber=0;
       return randomQueryResult;
   }    
}