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Bogus foreign key constraint fail
...
Two possibilities:
There is a table within another schema ("database" in mysql terminology) which has a FK reference
The innodb internal data dictionary is out of sync with the mysql one.
You can see which table it was (one of them, anyway) by doing a "SHOW ENGINE INNODB STATUS" after t...
What is the function __construct used for?
I have been noticing __construct a lot with classes. I did a little reading and surfing the web, but I couldn't find an explanation I could understand. I am just beginning with OOP.
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Are PDO prepared statements sufficient to prevent SQL injection?
...ting this answer to talk about PDO...
The long answer isn't so easy. It's based off an attack demonstrated here.
The Attack
So, let's start off by showing the attack...
$pdo->query('SET NAMES gbk');
$var = "\xbf\x27 OR 1=1 /*";
$query = 'SELECT * FROM test WHERE name = ? LIMIT 1';
$stmt = $pd...
Extract traceback info from an exception object
...n you're using.
In Python 3
It's simple: exceptions come equipped with a __traceback__ attribute that contains the traceback. This attribute is also writable, and can be conveniently set using the with_traceback method of exceptions:
raise Exception("foo occurred").with_traceback(tracebackobj)
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PHP function to get the subdomain of a URL
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I needed to get the "base" domain (without the subdomain), and I was making my own solution by exploding the host and getting the last elements of the array with a for loop, but I had to check their length (to detect if they were a part of the do...
How to get relative path from absolute path
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ctackectacke
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MVC (Laravel) where to add logic
...le Controller or a single Model. You can create as many services as needed based on the design and needs of your application. Add to that the advantage of calling a Service within any class of your application.
This goes long, but I would like to show you how I have structured my application:
app/...
Context switches much slower in new linux kernels
...ated recommended set of boot parameters for low CPU thread wake up latency based on these findings is:
intel_idle.max_cstate=0 processor.max_cstate=0 idle=mwait
The use of idle=mwait instead of idle=poll may also help with the initiation of Turbo Boost (by helping the CPU stay below its TDP [Ther...
Ora-00257 错误处理一列 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...列sqlplus assysdba报错ORA-12162切回系统确认系统当前的ORACLE_HOME和ORACLE_SID环境变量[oracle@asdlabdb01~]$echo$ORACLE_HOME空的[oracle...sqlplus /as sysdba
报错ORA-12162
切回系统
确认系统当前的ORACLE_HOME和ORACLE_SID环境变量
[oracle@asdlabdb01 ~]$ echo $ORA...
单页web应用（SPA）的简单介绍 - 更多技术 - 清泛网 - 专注C/C++及内核技术
... main.innerHTML=data;
}
});
}
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参考原文链接：http://www.cnblogs.com/constantince/p/5586851.html
单页应用 SPA