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由于最近在弄自绘界面，经常会在一些软件上取色。本来以前一直都用泪闯天涯的彗星小助手，很方便，但自从用了高分屏+Win10后，如果屏幕显示缩放不是100%，就会出现各种不兼容的问题，比如取色、截图结果都不准。所以就自己写了这个屏幕取色的小工具。 主要原理： 第一步：截取整个屏幕并生成位图图像 需要获取屏幕设备场景（DC）转换为位图，如果用易语言的 快照（） 命令在 显示缩放不为100% 的情况下是无法截取整个屏幕的 第二步：处理鼠标坐标偏差 举例：屏幕最大分辨率1920*1080 在显示缩放125%时，鼠标最大坐标1536*860（好像是），直接用鼠标坐标肯定是不准确的，需要进行转换。 计算方式：鼠标坐标*显示缩放比=最终坐标 比如：1536*1.25=1920

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Many popular database management systems implement a multiversion concurrency control algorithm called snapshot isolation rather than providing full serializability based on locking. There are well-known anomalies permitted by snapshot isolation that can lead to violations of data consistency by interleaving transactions that would maintain consistency if run serially. Until now, the only way to prevent these anomalies was to modify the applications by introducing explicit locking or ...

DB - Making Snapshot Isolation Serializable.pdf Snapshot Isolation (SI) is a multiversion concurrency control algorithm, first described in Berenson et al. [1995]. SI is attractive because it provides an isolation level that avoids many of the common concurrency anomalies, and has been implemented by Oracle and Microsoft SQL Server (with certain minor variations). SI does not guarantee serializability in all cases, but the TPC-C benchmark application [TPC-C],

This paper describes our experience implementing PostgreSQL’s new serializable isolation level. It is based on the recently-developed Serializable Snapshot Isolation (SSI) technique. This is the first implementation of SSI in a production database release as well as the first in a database that did not previously have a lock-based serializable isolation level. We reflect on our experience and describe how we overcame some of the resulting challenges, including the implementation of a new lock ...

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DB - A Critique of ANSI SQL Isolation Levels.pdf ANSI SQL-92 [MS, ANSI] defines Isolation Levels in terms of phenomena: Dirty Reads, Non-Re-peatable Reads, and Phantoms. This document shows that these phenomena and the ANSI SQL definitions fail to characterize several popular isolation levels, including the standard locking implementations of the levels. Investigating the ambiguities of the phenomena leads to clearer definitions.