public void close() {
		if(rs != null ){
			try {
				rs.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		if(stmt != null) {
			try {
				stmt.close();
			} catch(Exception e) {
				e.printStackTrace();
			}
		}
		if(pstmt != null) {
			try {
				pstmt.close();
			} catch(Exception e) {
				e.printStackTrace();
			}
		}
		if(connection != null) {
			try {
				connection.close();
			} catch(Exception e) {
				e.printStackTrace();
			}
		}
	}