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Unicode与UTF-8互转(C语言实现) - C/C++ - 清泛网 - 专注C/C++及内核技术
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字的编码方案. Unicode的学名是"Universal Multiple-Octet Coded Character Set",
简称为UCS. UCS可以看作是"Unicode Character Set"的缩写.
Unicode当然是一个很大的集合, 现在的规模可以容纳100多万个符号. 每个符号的编码都
不一样, 比如, U+0639表...
StringUtils.isBlank() vs String.isEmpty()
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StringUtils.isBlank() checks that each character of the string is a whitespace character (or that the string is empty or that it's null). This is totally different than just checking if the string is empty.
From the linked do...
How do I move files in node.js?
... fs.rename(oldPath, newPath, callback)
Added in: v0.0.2
oldPath <String> | <Buffer>
newPath <String> | <Buffer>
callback <Function>
Asynchronous rename(2). No arguments other than a possible exception
are given to the completion callback.
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Reasons for using the set.seed function
...set the seed (or choose a seed to pass into set.seed) based on a character string. For example you could have students use their name as the seed then each student has a unique dataset but the instructor can also create the same datasets for grading.
– Greg Snow
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Is there a valid reason for enforcing a maximum width of 80 characters in a code file, this day and
...ent setups: 1) in an ssh window connected to a remote machine. which is 80 characters wide by default. and 2) In Visual Studio, with two panels side-by-side so I can see header and cpp file at the same time.
– Enno
Nov 13 '08 at 21:27
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How do I retrieve my MySQL username and password?
....7.*, there is no column in mysql.user called password, use authentication_string instead.
– Adib Aroui
Jul 25 '16 at 19:03
3
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Alarm Manager Example
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android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.alarmexample.MainActivity"
android:label="@string/app_name" >
<...
Row count with PDO
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Using this approach, fetchColumn() returns a string "1234" ... your EDIT has echo count($nRows); - count() is an array function :P. I'd also recommend type casting the result from fetchColumn() to an integer. $count = (int) $stmt->fetchColumn()
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How to manually expand a special variable (ex: ~ tilde) in bash
...xpanded by a bash script in that manner because it is treated as a literal string "~". You can force expansion via eval like this.
#!/bin/bash
homedir=~
eval homedir=$homedir
echo $homedir # prints home path
Alternatively, just use ${HOME} if you want the user's home directory.
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Concatenate multiple result rows of one column into one, group by another column [duplicate]
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Simpler with the aggregate function string_agg() (Postgres 9.0 or later):
SELECT movie, string_agg(actor, ', ') AS actor_list
FROM tbl
GROUP BY 1;
The 1 in GROUP BY 1 is a positional reference and a shortcut for GROUP BY movie in this case.
string_agg() ...