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Error 1022 - Can't write; duplicate key in table
...ere the constraints are currently in use you can use the following query:
SELECT `TABLE_SCHEMA`, `TABLE_NAME`
FROM `information_schema`.`KEY_COLUMN_USAGE`
WHERE `CONSTRAINT_NAME` IN ('iduser', 'idcategory');
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Unix's 'ls' sort by name
... answered Aug 26 '13 at 19:44
Richard SmithRichard Smith
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Vim: faster way to select blocks of text in visual mode
I have been using vim for quite some time and am aware that selecting blocks of text in visual mode is as simple as SHIFT + V and moving the arrow key up or down line-by-line until I reach the end of the block of text that I want selected.
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What does the “map” method do in Ruby?
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map, along with select and each is one of Ruby's workhorses in my code.
It allows you to run an operation on each of your array's objects and return them all in the same place. An example would be to increment an array of numbers by one:
[...
INSERT INTO vs SELECT INTO
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They do different things. Use INSERT when the table exists. Use SELECT INTO when it does not.
Yes. INSERT with no table hints is normally logged. SELECT INTO is minimally logged assuming proper trace flags are set.
In my experience SELECT INTO is most commonly used with intermediate d...
ATL正则表达式库使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...来进行匹配了，Match方法的原型如下：
BOOL Match(const RECHAR *szIn, CAtlREMatchContext *pContext, const RECHAR **ppszEnd=NULL)
参数的含义很明显，不过需要注意到第一个参数的型别是：const RECHAR * szIN，是一个 const指针，这表明我们可以方...
How to enable C++11/C++0x support in Eclipse CDT?
...> Dialect
Put -std=c++11 into text box entitled other dialect flags or select ISO C++11 from the Language standard drop down.
For CMake project
Generate eclipse project files (inside your project)
mkdir build
cd build
cmake -G"Eclipse CDT4 - Unix Makefiles" -D CMAKE_BUILD_TYPE=Debug ..
Then...
Convert to binary and keep leading zeros in Python
...at include the 0b prefix, and the 010 size formats the output to fit in 10 characters width, with 0 padding; 2 characters for the 0b prefix, the other 8 for the binary digits.
This is the most compact and direct option.
If you are putting the result in a larger string, use an formatted string lite...
MSTest copy file to test run folder
...ile in Visual Studio, right click on the Solution and choose New Item, and select the TestSettings template. To use the TestSettings file at the command prompt of mstest.exe add the option, /testsettings:C:\Src\mySolution\myProject\local.testsettings (or add as an extra command line option in Team...
What are the differences between Chosen and Select2?
Chosen and Select2 are the two more popular libraries for extending selectboxes.
11 Answers
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