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H5大文件分片上传.rar
压缩文件中是实现了大文件分片上传的前后端代码,亲测通过。大文件上传的思路其实就是因为前端H5传输过程中,文件大小有限制,故将大文件进行分页上传,上传完成后再将分片的文件合并到一个文件中,这样即可实现了大文件的上传
2019-11-24
The Art of Sql
For all the buzz about trendy IT techniques, data processing is still at the core of our systems, especially now that enterprises all over the world are confronted with exploding volumes of data. Database performance has become a major headache, and most IT departments believe that developers should provide simple SQL code to solve immediate problems and let DBAs tune any "bad SQL" later.
In The Art of SQL, author and SQL expert Stephane Faroult argues that this "safe approach" only leads to disaster. His insightful book, named after Art of War by Sun Tzu, contends that writing quick inefficient code is sweeping the dirt under the rug. SQL code may run for 5 to 10 years, surviving several major releases of the database management system and on several generations of hardware. The code must be fast and sound from the start, and that requires a firm understanding of SQL and relational theory.
The Art of SQL offers best practices that teach experienced SQL users to focus on strategy rather than specifics. Faroult's approach takes a page from Sun Tzu's classic treatise by viewing database design as a military campaign. You need knowledge, skills, and talent. Talent can't be taught, but every strategist from Sun Tzu to modern-day generals believed that it can be nurtured through the experience of others. They passed on their experience acquired in the field through basic principles that served as guiding stars amid the sound and fury of battle. This is what Faroult does with SQL.
Like a successful battle plan, good architectural choices are based on contingencies. What if the volume of this or that table increases unexpectedly? What if, following a merger, the number of users doubles? What if you want to keep several years of data online? Faroult's way of looking at SQL performance may be unconventional and unique, but he's deadly serious about writing good SQL and using SQL well. The Art of SQL is not a cookbook, listing problems and giving recipes. The aim is to get you-and your manager-to raise good questions.
2014-12-12
银联网上支付接口(ChinaPay)
ChinaPay商户支付接口接入为ChinaPay商户会员提供完善的网上支付解决方案,让商户更快捷、方便和安心的开展网上交易。目前ChinaPay商户支付接口接入提供如下功能(支持WINDOWS,LINUX等操作系统): 商户消费交易的银行支付、商户针对成功消费交易的退款、商户对已有交易(消费)查询等功能。支持语言ASP/ASP.NET、Java、C#/C、PHP、 等主流开发语言。
2012-03-29
学生成绩管理系统学生成绩管理系统学生成绩管理系统
此程序实现学生成绩查询,更改,增添功能。用到的数据库是MySQL,而且压缩包中有对MySQL的使用说明和注意事项,即使不会数据库的同学,也能轻松进行该程序,由于时间仓促,第二个页面做的不是很好..
2010-06-18
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