貌似可以随机读取dataframe格式的文本文件.…

Question Does anyone know the fastest way to read large text files (10Mb) into a string.Readln is just too slow.   Answer 1 You may try this: function R(const FileName: string): string; var M: TFileStream; begin M := TFileStream.Create(FileName, fmOp…

solution 1: <Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" useSendfile="false" compression="on" compressionMinSize="2048" noCompressionUserA…

一.概述 HSSF和XSSF是apache开源项目POI中实现java面向Excel的两个接口.两者的区别在于,HSSF适用于Excel '97(-2007)文档,而XSSF适用于Excel 2007 OOXML (.xlsx). HSSF 和 XSSF 提供了许多用于工作表格创建.修改.阅读.撰写的方法.他们提供有: 特殊需求的低层次构建 针对只可阅读的的api 一个全用户的api(用于创建.阅读.修改XLS文件) 来自apache介绍 二.使用方法 具体的使用方法在官网上有介绍,在此不赘述…

Given an array A1,A2...AN, you have to print the size of the largest contiguous subarray such that LCM of all integers in that subarray is equal to the product of all integers in that subarray. Formally, For a subarray Ai,Ai+1...Aj where 1 ≤ i < j ≤…

Access text files using SQL statements by DB Query Analyzer Ma Gen feng (Guangdong Unitoll Services incorporated, Guangzhou510300) Abstract   Is it a dream that you can access text files using SQL statements? But now, it is true that DB Query Analyze…

Ascii vs. Binary Files Introduction Most people classify files in two categories: binary files and ASCII (text) files. You've actually worked with both. Any program you write (C/C++/Perl/HTML) is almost surely an ASCII file. An ASCII file is defined…

How fast is Redis? Redis includes the redis-benchmark utility that simulates running commands done by N clients at the same time sending M total queries (it is similar to the Apache's ab utility). Below you'll find the full output of a benchmark exec…

https://github.com/path/FastImageCache Fast Image Cache is an efficient, persistent, and—above all—fast way to store and retrieve images in your iOS application. Part of any good iOS application's user experience is fast, smooth scrolling, and Fast I…

https://medium.com/@mycoralhealth/learn-to-securely-share-files-on-the-blockchain-with-ipfs-219ee47df54c   If you have any questions about the following tutorial or want to request a future tutorial, join our Telegram chat! Ask us anything! Before re…