org.dromara.hutool.db.handler.NumberHandler Maven / Gradle / Ivy
/*
* Copyright (c) 2013-2024 Hutool Team and hutool.cn
*
* 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.
*/
package org.dromara.hutool.db.handler;
import java.sql.ResultSet;
import java.sql.SQLException;
/**
* 处理为数字结果,当查询结果为单个数字时使用此处理器(例如select count(1))
* @author loolly
*
*/
public class NumberHandler implements RsHandler{
private static final long serialVersionUID = 4081498054379705596L;
/**
* 单例
*/
public static final NumberHandler INSTANCE = new NumberHandler();
@Override
public Number handle(final ResultSet rs) throws SQLException {
return (null != rs && rs.next()) ? rs.getBigDecimal(1) : null;
}
}