surgerycommand.java

来自「与postgresql数据库结合的数据库水印软件包」· Java 代码 · 共 79 行

/*
 * 
 * Copyright 2003,2004 The Watermill Team
 *
 * This file is part of Watermill.
 *
 *    Watermill is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    Watermill is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with Watermill; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
package Watermill.rmill;

import java.util.*;
import Watermill.kernel.*;
import Watermill.relational.*;
import java.sql.*;

public class SurgeryCommand extends Command {

    public String dbName;
    public String tableName;
    public int percent;

    public SurgeryCommand(String dbName,String tableName,int percent){
	this.dbName=dbName;
	this.tableName=tableName;
	this.percent=percent;
    }
    
    public void execute(Manager m){
	DB document=(DB)m.getDocument(dbName,Constant.masterDBuser,Constant.masterDBpassword);
	
	Random r=new Random();
	Statement s=null;
	String query=null;
	try {
	    Connection con=document.getConnection();
	    s=con.createStatement();
	    
	    
	    for(int i=1;i<=percent;i++){
		int j=r.nextInt(100);
		
		query="delete from "+tableName+" where idp='product"+j+"'";
		s.executeUpdate(query);
		Msg.debug("Destroying tuple product"+j); 
	    }

	    query="select count(*) from "+tableName;
	    ResultSet rs=s.executeQuery(query);
	    rs.next();
	    int res=rs.getInt(1);
	    

	    Msg.println("SURGERIES, REMAIN "+res);
	}
	catch (Exception e){
	    Msg.fatal(e);
	}
    }
	
    public String toString(){
	return "SurgeryCommand from "+dbName;
    }
}