Ok, here’s a fairly basic one – how to force a textbox to accept only numeric input. Somebody asked me this today on a support call so I did a few quick lookups online and found the solutions listed rather unsatisfying. The main problem with most of…
Mapping abstract values to visual representations is what data visualization is all about, and that’s exactly what D3 scales do. This is usually done using pretty straightforward algorithms, but nothing is straightforward when you’re working with Dat…
Topics Logical Values struct Bool A value type whose instances are either true or false. Numeric Values struct Int A signed integer value type. struct Double A double-precision, floating-point value type. struct Float A single-precision, floating-poi…
reference url:http://www.cplusplus.com/reference/algorithm reference url:https://blog.csdn.net/Swust_Zeng_zhuo_K/article/details/80113384 <algorithm> Standard Template Library: Algorithms The header <algorithm> A range is any sequence of objec…
超文本传输协议版本 2 IETF HTTP2草案(draft-ietf-httpbis-http2-13) 摘要 本规范描述了一种优化的超文本传输协议(HTTP).HTTP/2通过引进报头字段压缩以及多路复用来更有效利用网络资源.减少感知延迟.另外还介绍了服务器推送规范. 本文档保持对HTTP/1.1的后向兼容,HTTP的现有的语义保持不变. 1 介绍 The Hypertext Transfer Protocol (HTTP) is a wildly successful protocol.…
commands : show sys connect sys as sysdba or connect system as sysdba logout or disc clear screen or cle screen (utlsample.sql —> unlock scott tables.sql —> all tables data.sql —> add data into tables) connect scott/tiger start C:\utlsample.sq…
