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MySQL “NOT IN” query
...In that case NOT IN will always return FALSE because NOT IN is treated as <> ALL, which compares all rows from the subquery like Table1.principal <> table2.principal, which fails when comparing with NULL: Table1.principal <> NULL will not result in TRUE. To fix: NOT IN (SELECT prin...
What is the Sign Off feature in Git for?
...mmit:
Add tests for the payment processor.
Signed-off-by: Humpty Dumpty <humpty.dumpty@example.com>
It should contain the user real name if used for an open-source project.
If branch maintainer need to slightly modify patches in order to merge them, he could ask the submitter to rediff, b...
Why does Maven have such a bad rep? [closed]
...
they expect a short, sound-bite answer. “Well it is a build tool or a scripting framework” Maven is more
than three boring, uninspiring words. It is a combination of ideas, standards, and software, and it is
impossible to distill the definition of Maven to simply digested sound-bites. Rev...
The type 'string' must be a non-nullable type in order to use it as parameter T in the generic type
...
Use string instead of string? in all places in your code.
The Nullable<T> type requires that T is a non-nullable value type, for example int or DateTime. Reference types like string can already be null. There would be no point in allowing things like Nullable<string> so it is disallo...
LINGO使用指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...．．”命令或直接按F11键就可以将LINGO命令脚本（command script）文件提交给系统进程来运行。
11．引入LINGO文件(Import Lingo File．．．)
从文件菜单中选用“Import Lingo File．．．”命令或直接按F12键可以打开一个LINGO格式模型的文件...
Reading settings from app.config or web.config in .NET
...
For a sample app.config file like below:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="countoffiles" value="7" />
<add key="logfilelocation" value="abc.txt" />
</appSettings>
</confi...
How can I recover a lost commit in Git?
...ptions on how to recover from a detached HEAD:
git checkout
git checkout <commit_id>
git checkout -b <new branch> <commit_id>
git checkout HEAD~X // x is the number of commits t go back
This will checkout new branch pointing to the desired commit.
This command will checkout to a...
Use JSTL forEach loop's varStatus as an ID
...he variable set by varStatus is a LoopTagStatus object, not an int. Use:
<div id="divIDNo${theCount.index}">
To clarify:
${theCount.index} starts counting at 0 unless you've set the begin attribute
${theCount.count} starts counting at 1
...
Case-INsensitive Dictionary with string key-type in C#
If I have a Dictionary<String,...> is it possible to make methods like ContainsKey case-insensitive?
5 Answers
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How can i query for null values in entity framework?
...
Workaround for Linq-to-SQL:
var result = from entry in table
where entry.something.Equals(value)
select entry;
Workaround for Linq-to-Entities (ouch!):
var result = from entry in table
where (value == null ? entry.somet...