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Transaction isolation levels relation with locks on table
...implementation and the algorithm they use: MVCC or Two Phase Locking.
CUBRID (open source RDBMS) explains the idea of this two algorithms:
Two-phase locking (2PL)
The first one is when the T2 transaction tries to change the A record,
it knows that the T1 transaction has already cha...
xtreme toolkit pro——CXTPReportControl控件教程 - C/C++ - 清泛网 - 专注C/C++及内核技术
...添加一个自定义控件，将该控件的class属性改为XTPReport，ID改为;IDC_REPORTCTRL_LIST。
（2）添加一个自定义变量：CXTPReportControl m_wndReportCtrl;
（3）将控件和变量联系起来，在对话框初始化函数OnInitDialog()中添加如下代码：
m_wndReport...
How to get JSON response from http.Get
...
The ideal way is not to use ioutil.ReadAll, but rather use a decoder on the reader directly. Here's a nice function that gets a url and decodes its response onto a target structure.
var myClient = &http.Client{Timeout: 10 * ...
What is the significance of 1/1/1753 in SQL Server?
...2, 1492, and July 4, 1776? Do
you include those missing 12 days? To
avoid having to solve this problem,
the original Sybase SQL Server
developers decided not to allow dates
before 1753. You can store earlier
dates by using character fields, but
you can't use any datetime functions
wi...
is vs typeof
...
+1: In the past I wondered why the C# compiler didn't compile typeof(string).TypeHandle to the ldtoken CIL instruction, but it looks like the CLR takes care of it in the JIT. It still takes a few extra opcodes but it's a more generalized application of the optimization.
...
Load view from an external xib file in storyboard
...
My full example is here, but I will provide a summary below.
Layout
Add a .swift and .xib file each with the same name to your project. The .xib file contains your custom view layout (using auto layout constraints preferably).
Make the swift file the xib file's...
Why should we NOT use sys.setdefaultencoding(“utf-8”) in a py script?
... time, when Python scans the environment. It has to be called in a system-wide module, sitecustomize.py, After this module has been evaluated, the setdefaultencoding() function is removed from the sys module.
The only way to actually use it is with a reload hack that brings the attribute back.
A...
Difference between git stash pop and git stash apply
...de, allowing you to nicely resolve such conflicts… and neither will get rid of the stash, even though perhaps you’re expecting pop too. Since a lot of people expect stashes to just be a simple stack, this often leads to them popping the same stash accidentally later because they thought it was g...
How to make my custom type to work with “range-based for loops”?
...le: You must overload pre-++, ensure the initialization expressions are valid, binary != that can be used in a boolean context, unary * that returns something you can assign-initialize range_declaration with, and expose a public destructor.
Doing so in a way that isn't compatible with an iterator is...
java.net.URLEncoder.encode(String) is deprecated, what should I use instead?
...n byte order
UTF-16 Sixteen-bit UCS Transformation Format, byte order identified by an optional byte-order mark
Example:
import java.net.URLEncoder;
String stringEncoded = URLEncoder.encode(
"This text must be encoded! aeiou áéíóú ñ, peace!", "UTF-8");
...