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How to re-sync the Mysql DB if Master and slave have different database incase of Mysql replication?
...ck) issue the command to get a dump of the master:
mysqldump -u root -p --all-databases > /a/path/mysqldump.sql
Now you can release the lock, even if the dump hasn't ended yet. To do it, perform the following command in the MySQL client:
UNLOCK TABLES;
Now copy the dump file to the slave us...
Create a hexadecimal colour based on a string with JavaScript
I want to create a function that will accept any old string (will usually be a single word) and from that somehow generate a hexadecimal value between #000000 and #FFFFFF , so I can use it as a colour for a HTML element.
...
What algorithms compute directions from point A to point B on a map?
...oughly half the work (2*pi*(r/2)^2 vs pi*r^2).
To avoid exploring the back-alleys of every city between your source and destination, you can have several layers of map data: A 'highways' layer that contains only highways, a 'secondary' layer that contains only secondary streets, and so forth. Then, ...
提升速度：XP注册表与驱动优化 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...优化方案
1、启动加速
虽然Windows XP的启动速度比Windows 98有了很大提高，但还是有加速的余力。到微软站点下载Bootvis.exe文件，启动它，依次选择菜单里面的Trace→Optimize System，这时候系统会提示是否重新启动，选择启动，重...
Pure virtual destructor in C++
...ing from A and then try to delete or destroy it, A's destructor will eventually be called. Since it is pure and doesn't have an implementation, undefined behavior will ensue. On one popular platform, that will invoke the purecall handler and crash.
Edit: fixing the declaration to be more conformant...
Python serialization - Why pickle?
...) into a character stream. The idea is that this character stream contains all the information necessary to reconstruct the object in another python script.
As for where the pickled information is stored, usually one would do:
with open('filename', 'wb') as f:
var = {1 : 'a' , 2 : 'b'}
pic...
What does 'const static' mean in C and C++?
...t depending on the architecture, and might be in memory marked read-only.
All that is how C treats these variables (or how C++ treats namespace variables). In C++, a member marked static is shared by all instances of a given class. Whether it's private or not doesn't affect the fact that one variab...
Purging file from Git repo failed, unable to create new backup
...can find those in .git/refs/original/…. Either delete that directory and all files within, or use the -f flag to force Git to delete the old references.
git filter-branch -f \
--index-filter 'git rm --cached --ignore-unmatch Rakefile' HEAD
...
Mapping many-to-many association table with extra column(s)
...ou don't put any cascade on your relationships, then you must persist/save all the entities. Although only the owning side of the relationship (here, the UserService side) must be initialized, it's also a good practice to make sure both sides are in coherence.
User user = new User();
Service servi...
How can I convert an image into a Base64 string?
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