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How can I define colors as variables in CSS?
...
CSS supports this natively with CSS Variables.
Example CSS file
:root {
--main-color:#06c;
}
#foo {
color: var(--main-color);
}
For a working example, please see this JSFiddle (the example shows one of the CSS selectors in the fiddle has the color hard coded to blue, the other C...
Where does Android emulator store SQLite database?
...o your regular hard drive.
Edit: Removed suggestion that this works for unrooted devices too - it only works for emulators, and devices where you are operating adb as root.
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How to mount a host directory in a Docker container
...nt boot2docker file on linux container
docker run -v /boot2dockerfolder:/root/containerfolder -i -t imagename
Then when you ls inside the containerfolder you will see the content of your hostfolder.
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When should I use a NoSQL database instead of a relational database? Is it okay to use both on the s
...roblems where a RDBMS is not a viable solution, for all other things I use MySQL (or SQLite for testing).
If you need a NoSQL db you usually know about it, possible reasons are:
client wants 99.999% availability on
a high traffic site.
your data makes
no sense in SQL, you find yourself
doing mult...
How to check if command line tools is installed
... user has a password. A blank password won't work when trying to enable a root user.
System Preferences > Users and Groups > (select user) > Change password
Then to enable root, run dsenableroot in a terminal:
$ dsenableroot
username = mac_admin_user
user password:
root password:
verif...
余佳文公开道歉： “一亿分红”本质上是吹嘘炒作 - 资讯 - 清泛网 - 专注C/...
...博，略有删节)
要变成商业领袖，一定要说话算数
无论如何，如果你想要创业，你得是第一把手，最后要变成领袖人物，一定要在这个公司说话算数，为这个公司制订理想、目标、价值观。如果没有这些指导的话，有时候有负...
C++ stl stack/queue 的使用方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
... 相同。
初学者在使用priority_queue 时，最困难的可能就是如何定义比较算子了。
如果是基本数据类型，或已定义了比较运算符的类，可以直接用STL 的less 算子和greater算子——默认为使用less 算子，即小的往前排，大的先出队。
...
How to split a comma-separated value to columns
... @S = 'ab,cd,ef,gh,ij',
@Split = ','
SELECT @X = CONVERT(xml,' <root> <myvalue>' +
REPLACE(@S,@Split,'</myvalue> <myvalue>') + '</myvalue> </root> ')
SELECT T.c.value('.','varchar(20)'), --retrieve ALL values at once
T.c.value('(/root/my...
How does the SQL injection from the “Bobby Tables” XKCD comic work?
...ample, you can only run multiple statements in one SQL string by using the mysqli_multi_query function.
You can, however, manipulate an existing SQL statement via SQL injection without having to add a second statement. Let's say you have a login system which checks a username and a password with th...
.append(), prepend(), .after() and .before()
...
<div></div>
// <-- $(".root").before("<div></div>");
<div class="root">
// <-- $(".root").prepend("<div></div>");
<div></div>
// <-- $(".root").append("<div></div>");
</div>
//...