public PreparedStatement getPreStatement(Connection conn){
		PreparedStatement preStat=null;
		StringBuffer sqlbuffer=new StringBuffer();
		sqlbuffer.append("SELECT link FROM test.LINK_INFO");
		try {
			preStat=conn.prepareStatement(sqlbuffer.toString());
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return preStat;
	}