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开源MQTT网关：EMQX vs Mosquitto - 创客硬件开发 - 清泛IT社区，为创新赋能！
引言物联网开发者需要为自己的物联网项目选择合适的 MQTT 消息产品或服务，从而构建可靠高效的基础数据层，保障上层物联网业务。目前市面上有很多开源的 MQTT 产品，在性能功能等方面各有优点。本文将选取目前最为流行的...
How do I specify “close existing connections” in sql script
I'm doing active development on my schema in SQL Server 2008 and frequently want to rerun my drop/create database script. When I run
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How to return result of a SELECT inside a function in PostgreSQL?
...ple.
But note the potential naming conflict between the OUT parameter cnt and the column alias of the same name. In this particular case (RETURN QUERY SELECT ...) Postgres uses the column alias over the OUT parameter either way. This can be ambiguous in other contexts, though. There are various way...
Regular vs Context Free Grammars
I'm studying for my computing languages test, and there's one idea I'm having problems wrapping my head around.
8 Answe...
TortoiseSVN icons not showing up under Windows 7
I can't seem to get the icons to display under Windows 7 and I really miss this from Windows XP.
31 Answers
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getResourceAsStream() vs FileInputStream
I was trying to load a file in a webapp, and I was getting a FileNotFound exception when I used FileInputStream . However, using the same path, I was able to load the file when I did getResourceAsStream() .
What is the difference between the two methods, and why does one work while the other do...
How do I enter RGB values into Interface Builder?
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Click on the color slider icon, and then choose "RGB Sliders" from the drop-down list.
You can also use the magnifying-glass as a color picker to pick up an exact color from anywhere on the screen; also see @ken's excellent comment below clarifying how col...
Linux: is there a read or recv from socket with timeout?
...t completes. It
accepts a timeval structure with the
number of seconds and microseconds
specifying the limit on how long to
wait for an input operation to
complete. If a receive operation has
blocked for this much time without
receiving additional data, it shall
return with a partial...
Process all arguments except the first one (in a bash script)
...ave a simple script where the first argument is reserved for the filename, and all other optional arguments should be passed to other parts of the script.
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Fragment or Support Fragment?
I am developing an app that supports Android >= 4.0. It uses fragments from the android.app package. As I am facing problems with the older fragment implementation in 4.0, like this one , that are already fixed in the support library, I am considering switching back to the fragment implementation...