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add column to mysql table if it does not exist
... for 1060 begin end;
alter table atable add subscriber_surname varchar(64);
end;;
call foo();;
I think its neater this way than with an exists subquery. Especially if you have a lot of columns to add, and you want to run the script several times.
more info on continue handlers can be found at...
Keep overflow div scrolled to bottom unless user scrolls up
...
$('#yourDiv').scrollTop($('#yourDiv')[0].scrollHeight);
Live demo: http://jsfiddle.net/KGfG2/
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Can someone explain the “debounce” function in Javascript
...unc.apply(context, args);
}
}
/////////////////////////////////
// DEMO:
function onMouseMove(e){
console.clear();
console.log(e.x, e.y);
}
// Define the debounced function
var debouncedMouseMove = debounce(onMouseMove, 50);
// Call the debounced function on every mouse move...
Detecting Windows or Linux? [duplicate]
...+ s);
}
}
// EXAMPLE OUTPUT: OS=name: Windows 7, version: 6.1, arch: amd64
Here are more details:
http://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html
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一分钟明白 VS manifest 原理 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ntity type="win32" name="Microsoft.VC80.DebugCRT" processorArchitecture="ia64" publicKeyToken="1fc8b3b9a1e18e3b"/>
<bindingRedirect oldVersion="8.0.41204.256-8.0.50608.0" newVersion="8.0.50727.42"/>
</dependentAssembly>
指明"8.0.41204.256-8.0.50608.0"都被定向到8.0.50727.42。这是assembly...
Eclipse XDebug配置 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...加如下配置：
zend_extension = php_xdebug-2.5.4-5.6-vc11-nts-x86_64.dll
[Xdebug]
xdebug.auto_trace = On
xdebug.show_exception_trace = On
xdebug.remote_autostart = Off
xdebug.remote_enable = On
xdebug.collect_vars = On
xdebug.collect_return = On
xdebug.collect_params = On
xdebug.trac...
App Inventor 2 中文网 · 升级日志
...部分功能；部分文档翻译，新增 FileTools、 SimpleBase64、 MQTT、 ClientSocket 拓展文档及翻译。 230516 2023/05/16 优化 启用HSTS（HTTP Strict Transport Security）安全机制。 升级 启用 h2（HTTP 2.0）协议...
App Inventor 2 离线版 - 免登录，离线用，一键启动，App开发so easy！
... Windows x64客户端 免费下载 软件大小：1.6 GB 配...
How can I check if a Perl array contains a particular value?
....73/s (n=100000)
first: 1 wallclock secs ( 0.63 usr + 0.01 sys = 0.64 CPU) @ 156250.00/s (n=100000)
grep: 42 wallclock secs (41.95 usr + 0.08 sys = 42.03 CPU) @ 2379.25/s (n=100000)
hash: 0 wallclock secs ( 0.01 usr + 0.00 sys = 0.01 CPU) @ 10000000.00/s (n=100000)
...
Why isn't the size of an array parameter the same as within main?
...func, it will immediately decay into a pointer to its first element. (On a 64-bit system, a 64-bit pointer is twice as large as a 32-bit int, so your sizeof ratio returns 2.)
The only purpose of this rule is to maintain backwards compatibility with historical compilers that did not support passing ...