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What's the difference between utf8_general_ci and utf8_unicode_ci?
...f either _unicode or _general. Much of what's written below is not of much interest anymore if you can use one of the newer collations instead.
Key differences
utf8mb4_unicode_ci is based on the official Unicode rules for universal sorting and comparison, which sorts accurately in a wide range of l...
How do the likely/unlikely macros in the Linux kernel work and what is their benefit?
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They are hint to the compiler to emit instructions that will cause branch prediction to favour the "likely" side of a jump instruction. This can be a big win, if the prediction is correct it means that the jump instruction is basically...
MySQL一次主从数据不一致的问题解决过程 - 数据库(内核) - 清泛网 - 专注C/...
... NOT NULL, tbl CHAR(64) NOT NULL, chunk INT NOT NULL, chunk_time FLOAT NULL, chunk_index VARCHAR(200) NULL, lower_boundary TEXT NULL, upper_boundary TEXT NULL, this_crc CHAR(40) ...
Android ACTION_IMAGE_CAPTURE Intent
...the small Bitmap image. However, if we putExtra(EXTRA_OUTPUT,...) on the intent before starting it, everything works until you try to hit the "Ok" button in the camera app. The "Ok" button just does nothing. The camera app stays open and nothing locks up. We can cancel out of it, but the file neve...
Creating a copy of an object in C# [duplicate]
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There is no built-in way. You can have MyClass implement the IClonable interface (but it is sort of deprecated) or just write your own Copy/Clone method. In either case you will have to write some code.
For big objects you could consider Serialization + Deserialization (through a MemoryStream)...
org.hibernate.MappingException: Could not determine type for: java.util.List, at table: College, for
...t field solved this issue:
@Column
@ElementCollection(targetClass=Integer.class)
private List<Integer> countries;
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Difference between getDefaultSharedPreferences and getSharedPreferences
... {
return context.getPackageName() + "_preferences";
}
private static int getDefaultSharedPreferencesMode() {
return Context.MODE_PRIVATE;
}
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Android Preferences: How to load the default values when the user hasn't used the preferences-screen
...rriding the user's settings each time your Activity is created
Take a look into PreferenceManager.setDefaultValues in Android API for further investigation.
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How to concatenate strings in twig
...lde (~), like Alessandro said, and here it is in the documentation:
~: Converts all operands into strings and concatenates them. {{ "Hello
" ~ name ~ "!" }} would return (assuming name is 'John') Hello John!. – http://twig.sensiolabs.org/doc/templates.html#other-operators
And here is an e...
Why do I have to access template base class members through the this pointer?
... compiler must compile the template as soon as it sees it (to some kind of internal parse tree representation), and defer compiling the instantiation until later.
The checks that are performed on the template itself, rather than on particular instantiations of it, require that the compiler be able ...