public static void main(String[] args){
		Conn con = PoolManager.getInstance().getConnection();
		Connection conn = con.getConn();
		
		Statement stmt = null;
		ResultSet rs = null;
		try {
			stmt = conn.createStatement();
			rs = stmt.executeQuery("select * from article ");
			int c = rs.getMetaData().getColumnCount();			
			for(int i = 1; i <= c; ++i){
				System.out.println(rs.getMetaData().getColumnName(i));
			}
			
			while (rs.next()) {
				System.out.print(rs.getString("title"));				
				System.out.print(rs.getString("author"));
				
				
				//System.out.print(rs.getObject("abc"));
				
				System.out.println();
			}
		}catch(SQLException e){
			e.printStackTrace();
		}finally{
			/*this.closeDB(stmt, rs);
			dbConns.freeConnection("mcms", conn);*/
			try{
				stmt.close();
			}catch(SQLException e){
				e.printStackTrace();
			}
			
			PoolManager.getInstance().releaseConnection(con);// 释放链接
		}
	}