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MySQL “incorrect string value” error when save unicode string in Django
...8mb4 uses 33% more space than utf-8 you'll need to make these fields 33% smaller.
In this case, change the max_length from 255 to 191.
Alternatively you can edit your MySQL configuration to remove this restriction but not without some django hackery
UPDATE: I just ran into this issue again and ...
Best way to store time (hh:mm) in a database
...e, but what's the best way to do this without storing more info than I actually need?
15 Answers
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Download data url file
... just drag their zip directly into the browser and it'll let them download all the files within. They can also create new zip files by dragging individual files in.
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What is the difference between vmalloc and kmalloc?
...
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warning C4996 - C/C++ - 清泛网 - 专注C/C++及内核技术
warning C4996warning C4996: '_vsnprintf': This function or variable may be unsafe. ......warning C4996: strcpy was declar...warning C4996: '_vsnprintf': This function or variable may be unsafe. ......
warning C4996: strcpy was declared deprecated
出现这样的警告，是因为VC2005之后的版...
[工程源码实例] C++ ADO 读写Excel源码及注意点 - C/C++ - 清泛网 - 专注C/C++及内核技术
...！！
#import "C:\Program Files\Common Files\System\ADO\msado15.dll" no_namespace rename("EOF", "adoEOF") rename("BOF", "adoBOF")
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//连接字符串(这里是Excel 2003, 2007的Extended Properties="Excel 12.0 Xml;貌似找不到驱动，有解决的烦请评论告知下)
"Provider='Mic...
在MongoDB中模拟Auto Increment - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...言以PHP为例，代码大致如下所示：
<?php
function generate_auto_increment_id($namespace, array $option = array())
{
$option += array(
'init' => 1,
'step' => 1,
);
$instance = new Mongo();
$instance = $instance->selectCollection('_seq', 'seq...
领域驱动设计系列（五）:事件驱动之异步事件 - 更多技术 - 清泛网 - 专注C/...
... Publish<T>(T concreteEvent) where T: Event
{
var handlers = _container.ResolveAll<IEventHandler<T>>();
foreach (var handle in handlers)
{
handle.Handle(concreteEvent);
}
}
}
为了提高性能，我们可以先来第一步改进
pub...
nsis安装之前备份程序，便于回滚 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...策略(暂定：仅备份最近一次)
RMDir /r "$INSTDIR\..\${SHORTCUT_NAME}_bak"
CopyFiles "$INSTDIR\*" "$INSTDIR\..\${SHORTCUT_NAME}_bak"
Delete "$INSTDIR\..\${SHORTCUT_NAME}_bak\uninst.exe"
;备份结束
SetOutPath "$INSTDIR"
SetOverwrite on
; first pic
EBanner::sho...
mfc110d.dll!ATL::CSimpleStringT::~CSimpleStringT() 行 291 - 更多技术 -...
mfc110d.dll!ATL::CSimpleStringT::~CSimpleStringT() 行 291> msvcr110d.dll!_CrtIsValidHeapPointer(const void * pUserData) 行 2036 C++ msvcr110d.dll!_free_dbg_nolock(void * pUserDa...> msvcr110d.dll!_CrtIsValidHeapPointer(const void * pUserData) 行 2036 C++
msvcr110d.dll!_free_dbg_nolock(void * p...