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MySQL query to get column names?
...lumn type, whether the column is nullable, max column size, character set, etc)...
Oh, and it's standard SQL (Whereas SHOW ... is a MySQL specific extension)...
For more information about the difference between SHOW... and using the INFORMATION_SCHEMA tables, check out the MySQL Documentation on I...
Apache Prefork vs Worker MPM
...te easily.
The setting for prefork, worker, or event is set in sudo nano /etc/httpd/conf.modules.d/00-mpm.conf (for CentOS 6.x/7.x/Apache 2.4).
# Select the MPM module which should be used by uncommenting exactly
# one of the following LoadModule lines:
# prefork MPM: Implements a non-threaded, p...
What can you use Python generator functions for?
...an iterate like this:
db = MySQLdb.connect(host="localhost", user="root", passwd="root", db="domains")
cursor = db.cursor()
cursor.execute("SELECT domain FROM domains")
for result in ResultGenerator(cursor):
doSomethingWith(result)
db.close()
...
When to use self over $this?
...context (are we in an object-context already? Are we outside of an object? etc).
What are the disadvantages of using persistent connection in PDO
... (Apache for mod_php, the current FastCGI process if you're using FastCGI, etc), not at the PHP level, and PHP doesn't tell the parent process to let the connection die when the script terminates abnormally.
If the dead script locked tables, those tables will remain locked until the connection dies...
When and why I should use session_regenerate_id()?
...g some important inputs (changing passwords, credentials, forgot passwords etc.) which may compromise site security or privacy policy.
See also:
PHP Security Guide: Sessions
Session Fixation(Nice read)
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MongoDB副本集详解 优于以往的主从模式 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...来很旧了，停止选举等待人来操作。
? 如果上面都没有问题就选择最后操作时间戳最新（保证数据是最新的）的服务器节点作为主节点。
选举的触发条件
初始化一个副本集时。
副本集和主节点断开连接，可能是网络问题。...
Git 工具 - 子模块(submodule)：一个仓库包含另一个仓库 - 开源 & Github -...
...方库，或者你独立开发的，用于多个父项目的库。 现在问题来了：你想要把它们当做两个独立的项 有种情况我们经常会遇到：某个工作中的项目需要包含并使用另一个项目。 也许是第三方库，或者你独立开发的，用于多个父...
Apache and Node.js on the Same Server
...or file handling (saving, editing, renaming, downloading, uploading files, etc.), he wants to use apache. So, I must:
10 A...
Can you explain the concept of streams?
... the compressed form on to another stream, or one which encrypts the data, etc. At the other end there'd be the reverse chain, decrypting, decompressing or whatever.
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