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C++使用OLE/COM高速读写EXCEL的源码 - C/C++ - 清泛网 - 专注C/C++及内核技术

...下步骤: 1、导入并封装Excel中的接口 Excel作为OLE/COM库插件,定义好了各类交互的接口,这些接口是跨语言的接口。VC可以通过导入这些接口,并通过接口来对Excel的操作。 由于本文只关心对Excel表格中的数据的读取,主要关注...
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Excel RTD(Excel Real-Time Data)实时刷新数据技术 - C/C++ - 清泛网 - 专注C/C++及内核技术

...xcel中异步自定义函数,异步的UDF函数能够极大地提高Excel插件的用户体验,能够提高系统的可扩展性和稳定性。 本文所有的代码点击此处下载,希望本文对您了解Excel中的RTD函数有所帮助。 来源:http://www.cnblogs.com/yangecnu/p/Excel...
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ZMQ: 基本原理 - 开源 & Github - 清泛网 - 专注C++内核技术

...持多源码文件编译运行 7次浏览 4eclipse git插件设置代理 6次浏览 5prism 怎么加入行号? 6次浏览 6【解决】cannot load such f... 5次浏览 7CMake 编译libcurl 5次浏览 ...
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通信连接组件 · App Inventor 2 中文网

...像的Base64编码及解码方法,便于图像文件的通信传输。此插件仅提供2个函数,使用非常方便,几乎没有学习成本。 属性 无 事件 无 方法 EncodeImage DecodeImage MqttClient 拓展 .aix 拓展及demo程序打包下载: UrsAI2Paho.zip MQT...
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构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...系统任务。存储引擎层有很多种,mysql提供了存储引擎的插件式结构,支持多种存储引擎,用的最广泛的是innodb和myisamin;inodb主要面向OLTP方面的应用,支持事务处理,myisam不支持事务,表锁,对OLAP操作速度快。 以下主要针对in...
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generate days from date range

...000 days, and could be extended to go as far back or forward as you wish. select a.Date from ( select curdate() - INTERVAL (a.a + (10 * b.a) + (100 * c.a) + (1000 * d.a) ) DAY as Date from (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all ...
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Efficiently convert rows to columns in sql server

...ou can use the PIVOT function to transform the data from rows to columns: select Firstname, Amount, PostalCode, LastName, AccountNumber from ( select value, columnname from yourtable ) d pivot ( max(value) for columnname in (Firstname, Amount, PostalCode, LastName, AccountNumber) ) piv; S...
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Is it possible to use the SELECT INTO clause with UNION [ALL]?

... This works in SQL Server: SELECT * INTO tmpFerdeen FROM ( SELECT top 100 * FROM Customers UNION All SELECT top 100 * FROM CustomerEurope UNION All SELECT top 100 * FROM CustomerAsia UNION All SELECT top 100 * FROM CustomerAme...
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Best way to test if a row exists in a MySQL table

... You could also try EXISTS: SELECT EXISTS(SELECT * FROM table1 WHERE ...) and per the documentation, you can SELECT anything. Traditionally, an EXISTS subquery starts with SELECT *, but it could begin with SELECT 5 or SELECT column1 or anything ...
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LISTAGG in Oracle to return distinct values

... 19c and later: select listagg(distinct the_column, ',') within group (order by the_column) from the_table 18c and earlier: select listagg(the_column, ',') within group (order by the_column) from ( select distinct the_column from t...