databaseinfo.java

一个ERP强大系统的源码

/*
 *this file is part of nseer erp
 *Copyright (C)2006-2010 Nseer(Beijing) Technology co.LTD/http://www.nseer.com 
 *
 *This program 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.
 *
 *This program 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 this program; if not, write to the Free Software
 *Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *这个文件是恩信科技ERP软件的组成部分。
 *版权所有（C）2006-2010 北京恩信创业科技有限公司/http://www.nseer.com
 *
 *这一程序是自由软件，你可以遵照自由软件基金会出版的GNU通用公共许可
 *证条款来修改和重新发布这一程序。或者用许可证的第二版，或者（根据你的选
 *择）用任何更新的版本。
 *
 *发布这一程序的目的是希望它有用，但没有任何担保。甚至没有适合特定目
 *的的隐含的担保。更详细的情况请参阅GNU通用公共许可证。
 *你应该已经和程序一起收到一份GNU通用公共许可证的副本。如果还没有，
 *写信给：
 *The Free Software Foundation, Inc., 675 Mass Ave, Cambridge,
 *MA02139, USA
 */
package com.xml.export;

import java.sql.*;
import include.nseer_db.*;

public class DataBaseInfo{
	//rivate static Logger _log = Logger.getLogger("DataBaseInfo.class"); 
	   ResultSet rs = null;
	   nseer_db db = null;
	   private String tablename ="";
	   private String condition ="";
	   
       public DataBaseInfo(String dbname,String tablename,String condition){
			   this.tablename = tablename;
			   this.condition = condition;
       	       db = new nseer_db(dbname);
       	       rs = db.executeQuery("select * from "+tablename+" "+condition+"");
       	       
       	}
       
      
      		 
     
      
      /*getColumnType的辅助方法 */
      
      public  int getColumnIndex(String columnName){
      	  try {
      	  	   ResultSetMetaData rsmd = rs.getMetaData();
      	  	   for(int i=1;i<=rsmd.getColumnCount();i++){
      	  	   	    if(columnName.equals(rsmd.getColumnName(i)))
      	  	   	      return i;
      	  	   	}    
		    }
		    catch (Exception ex) {
		       ex.printStackTrace();
		       return -1;
		    }	
      	     return -1; 
      	}
      
      
      public  String getColumnType(String columnName) throws Exception{
      		  try {
      		  	 if(rs ==null) throw new Exception("请指定你的数据表名称");
      		  	 ResultSetMetaData rsmd =rs.getMetaData();
      		  	 if(getColumnIndex(columnName) == -1)
      		  	    return (null);
			     else
			        return rsmd.getColumnTypeName(getColumnIndex(columnName));
			    }
			    catch (Exception ex) {
			      ex.printStackTrace();
			      return (null);
			    }
      	}
      
       public String getTableName(){
       	   return this.tablename;
       	}
       	    
	  public void close(){
	  	   db.close();
	  	   db = null;
	  	}
}