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Can constructors throw exceptions in Java?
...he constructor ought to be careful to avoid acquiring unmanaged resources (file handles etc) and then throwing an exception without releasing them. For example, if the constructor tries to open a FileInputStream and a FileOutputStream, and the first succeeds but the second fails, you should try to c...
Foreign key constraint may cause cycles or multiple cascade paths?
...ebug) the implementation and endure their disadvantages (worse performance etc).
– onedaywhen
Feb 22 '16 at 15:14
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When to use inline function and when not to use it?
...ll functions).
About performance, the wise approach is (as always) to profile the application, then eventually inline a set of functions representing a bottleneck.
References:
To Inline or Not To Inline
[9] Inline functions
Policies/Binary Compatibility Issues With C++
GotW #33: Inline
Inline R...
Cross cutting concern example
...se I may want to log in the presentation layer, business layer, data layer etc.
– CodingYoshi
May 14 '18 at 1:52
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how to stop browser back button using javascript
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I created a .js file as recommended and included the js file in my code using the following: <script src="./javascript/noback.js"></script> But I can still perform a back (using Safari). What am I missing? This library was ad...
How do you show animated GIFs on a Windows Form (c#)
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It's not too hard.
Drop a picturebox onto your form.
Add the .gif file as the image in the picturebox
Show the picturebox when you are loading.
Things to take into consideration:
Disabling the picturebox will prevent the gif from being animated.
Animated gifs:
If you are looking for anim...
How can I see the raw SQL queries Django is running?
... can find your postgresql.conf by running psql -U postgres -c 'SHOW config_file'
– kramer65
Oct 1 '19 at 7:23
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How to paste in a new line with vim?
...o any key, including p itself: :nmap p :pu<CR> Put it in your .vimrc file and off you go :)
– Capi Etheriel
Mar 12 '12 at 14:17
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初窥InnoDB的Memcached插件 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...wn -R mysql data
shell> bin/mysqld_safe --user=mysql &
shell> cp support-files/mysql.server /etc/init.d/mysql.server
MySQL安装完毕后，在插件目录我们能看到innodb_engine.so和libmemcached.so：
mysql> SELECT @@plugin_dir;
+------------------------------+
| @@plugin_dir ...
Ruby on Rails: how do I sort with two columns using ActiveRecord?
...ormats, all valid):
Model.order(foo: :asc).order(:bar => :desc).order(:etc)
Maybe it's more verbose, but personally I find it easier to manage.
SQL gets produced in one step only:
SELECT "models".* FROM "models" ORDER BY "models"."etc" ASC, "models"."bar" DESC, "models"."foo" ASC
Thusly, fo...