Here you can find the source of getLong(Object object)
public static Long getLong(Object object)
//package com.java2s; /**//ww w. j av a 2s.c om * Copyright 2014 Nortal AS * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.math.BigDecimal; import java.sql.ResultSet; import java.sql.SQLException; public class Main { public static Long getLong(ResultSet rs, String columnLabel) throws SQLException { return getLong(rs.getObject(columnLabel)); } public static Long getLong(Object object) { if (object == null) { return null; } else if (object instanceof BigDecimal) { return Long.valueOf(((BigDecimal) object).longValue()); } else if (object instanceof Long) { return (Long) object; } else if (object instanceof String) { return Long.valueOf((String) object); } throw new IllegalArgumentException("You can give only String, BigDecimal and Long types!"); } }