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creating a random number using MYSQL
...
RAND(), UUID(), NOW() are indeterministic functions. The calling of such functions should be avoid from being written into the bin log for replication. For example. INSERT INTO t SET ID=UUID(); will cause the value of the ID fields to ...
LoadRunner中参数化技术详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ique Number
唯一值来代替参数
7
Vuser ID
LoadRunner使用该虚拟用户的ID来代替参数值，该ID是由Controller来控制的，在VuGen中运行脚本时，该值为-1.
8
DataFile/Table
可以在属性设置中编辑...
What is an optional value in Swift?
... a trick to make easier-to-read code. If an optional equals nil, this just means that the enum is currently set to .none.
Only optionals can be nil
If you try to set a non-optional variable to nil, you'll get an error.
var red: String = "Red"
red = nil // error: nil cannot be assigned to type 'Stri...
How do I replace all line breaks in a string with elements?
...str.replace(/(?:\r\n|\r|\n)/g, '<br>');
In case you wonder what ?: means.
It is called a non-capturing group. It means that group of regex within the parentheses won't be saved in memory to be referenced later.
You can check out these threads for more information:
https://stackoverflow.com/a...
Sass .scss: Nesting and multiple classes?
..., so the following is possible too:
.container {
background:red;
#id &{
background:blue;
}
}
/* compiles to: */
.container {
background: red;
}
#id .container {
background: blue;
}
However be aware, that this somehow breaks your nesting structure and thus may incre...
Escaping ampersand in URL
...n a character from the reserved set (a "reserved character") has
special meaning (a "reserved purpose") in a certain context, and a URI
scheme says that it is necessary to use that character for some other
purpose, then the character must be percent-encoded. Percent-encoding
a reserved chara...
What is PECS (Producer Extends Consumer Super)?
...per wildcard when you only Put values into a structure.
Note: wildcard ? means zero or one time, represents an unknown type. The wildcard can be used as the type of a parameter, never used as a type argument for a generic method invocation, a generic class instance creation.(i.e. when used wildcar...
How do I escape reserved words used as column names? MySQL/Create Table
...f ANSI SQL mode is enabled
CREATE TABLE IF NOT EXISTS misc_info
(
id INTEGER PRIMARY KEY AUTO_INCREMENT NOT NULL,
"key" TEXT UNIQUE NOT NULL,
value TEXT NOT NULL
)
ENGINE=INNODB;
or the proprietary back tick escaping otherwise. (Where to find the ` character on various key...
How can I use “:” as an AWK field separator?
...
What do you mean by "...and for an will return..."?
– Peter Mortensen
Aug 27 at 13:19
...
How to vertically center a inside a div? [duplicate]
...ugh therein references a third option: display:table-cell; vertical-align:middle (along with a display:table-row parent). :) But no, you can be sure that I would never advocate using HTML table elements for layout.
– Phrogz
Dec 5 '10 at 4:19
...