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Cannot delete or update a parent row: a foreign key constraint fails
...references. This:
ALTER TABLE `advertisers`
ADD CONSTRAINT `advertisers_ibfk_1` FOREIGN KEY (`advertiser_id`)
REFERENCES `jobs` (`advertiser_id`);
...is actually the opposite to what it should be. As it is, it means that you'd have to have a record in the jobs table before the advertis...
^M at the end of every line in vim
...
As a command, type
:%s/^M$//
(To get ^M, press ^V ^M, where ^ is CTRL on most keyboards)
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What is a stored procedure?
...es. This is a good first step against SQL injection.
Stored procedures do come with downsides, basically the maintenance associated with your basic CRUD operation. Let's say for each table you have an Insert, Update, Delete and at least one select based on the primary key, that means each table wil...
How to declare a global variable in php?
...nstead of a global:
class MyTest
{
protected $a;
public function __construct($a)
{
$this->a = $a;
}
public function head()
{
echo $this->a;
}
public function footer()
{
echo $this->a;
}
}
$a = 'localhost';
$obj = new MyTes...
App Inventor 2 数学代码块 · App Inventor 2 中文网
...言的算术右移 >> 语义一致。
参考代码如下：
when 按钮_左移.Click() {
标签_结果.Text = 5 * 2
}
when 按钮_右移.Click() {
标签_结果.Text = floor(5 / 2)
}
通用函数版本：把位数做成参数，任何值、移多少位都能用（左移 = ×2ⁿ，右移 = ...
C++ lambda with captures as a function pointer
...ion has no room for a state." -> How the hell can languages like Java accomplish this then? Well, of course, because that single, global function is created at runtime and embeds the state (or rather the reference to it) in its own code. That is the whole point - there should not be a single, glo...
SVN: Is there a way to mark a file as “do not commit”?
With TortoiseSVN, I can move a file into the ignore-on-commit changelist, so that when I commit a whole tree, changes to that file do not get committed.
...
Duplicating a MySQL table, indices, and data
...oldtable;
To copy just structure and data use this one:
CREATE TABLE tbl_new AS SELECT * FROM tbl_old;
I've asked this before:
Copy a MySQL table including indexes
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How to do a regular expression replace in MySQL?
...ng regular expressions. You could find my post at the following location:
http://techras.wordpress.com/2011/06/02/regex-replace-for-mysql/
Here is the function code:
DELIMITER $$
CREATE FUNCTION `regex_replace`(pattern VARCHAR(1000),replacement VARCHAR(1000),original VARCHAR(1000))
RETURNS VAR...