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“INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”
...enerated, but it is not used in the changed row.
See demonstration below, tested with Percona Server 5.5.28. The configuration variable innodb_autoinc_lock_mode=1 (the default):
mysql> create table foo (id serial primary key, u int, unique key (u));
mysql> insert into foo (u) values (10);
m...
Get current AUTO_INCREMENT value for any table
...
Does this give the latest AUTO_INCREMENT value in the table or what the nnext value is going to be?
– sidx
Aug 19 '15 at 6:50
...
Need for predictable random generator
....
I wrote a simple Shuffle Bag like implementation in Ruby and did some testing. The implementation did this:
If it still seems fair or we haven't reached a threshold of minimum rolls, it returns a fair hit based on the normal probability.
If the observed probability from past rolls makes it s...
App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议 · App Inventor 2 中文网
... 教育 入门必读 中文教程 IoT专题 AI2拓展 ChatGPT接入 Aia Store 开通VIP 搜索 App Inventor 2 UrsAI2UDP 拓展 - UDP广播...
What are some good resources for learning about Artificial Neural Networks? [closed]
...any notions that artificial neural networks have anything to do with the brain but for a passing similarity to networks of biological neurons. Learning biology won't help you effectively apply neural networks; learning linear algebra, calculus, and probability theory will. You should at the very lea...
分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...虑下面的这么几个情况：
1）容灾：数据不丢、结点的Failover
2）数据的一致性：事务处理
3）性能：吞吐量 、 响应时间
前面说过，要解决数据不丢，只能通过数据冗余的方法，就算是数据分区，每个区也需要进行数据冗余处...
Why should I avoid multiple inheritance in C++?
...ly, it was done for bad reasons, and it will blow back in the face of the maintainer.
Summary
Consider composition of features, instead of inheritance
Be wary of the Diamond of Dread
Consider inheritance of multiple interfaces instead of objects
Sometimes, Multiple Inheritance is the right thing. I...
StringUtils 字符串工具扩展：强大的文本处理工具集 · App Inventor 2 中文网
...e.ullisroboterseite.ursai2stringutils.aix
.aia示例文件：
StringUtilsTest.aia
版本历史
版本
日期
修改内容
1.0
2024-06-15
初始版本
1.1
2025-04-20
添加 getASCIICode...
DaffyMenu 扩展：弹出菜单扩展，为组件添加弹出式菜单功能 · App Inventor 2 中文网
...链接
扩展文件：
com.gordonlu.daffymenu.aix
demo:
Test.aia
功能概述
扩展特性
弹出式菜单：为任何组件添加右键菜单功能
自定义选项：支持添加多个菜单项
事件响应：处理菜单项...
How to copy files from 'assets' folder to sdcard?
...ssetManager.list("");
} catch (IOException e) {
Log.e("tag", "Failed to get asset file list.", e);
}
if (files != null) for (String filename : files) {
InputStream in = null;
OutputStream out = null;
try {
in = assetManager.open(filename);
...