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Lua简明教程 - 脚本技术 - 清泛IT论坛，有思想、有深度
...ello, World")
chenhao-air:lua chenhao$ chmod +x hello.lua
chenhao-air:test chenhao$ ./hello.lua
Hello, World复制代码
语法注释 -- 两个减号是行注释
--[[
这是块注释
这是块注释
变量Lua的数字只有double型，64bits，你不必担心Lua处理浮点...
Mockito - difference between doReturn() and when()
...ck my service layer objects in a Spring MVC application in which I want to test my Controller methods. However, as I have been reading on the specifics of Mockito, I have found that the methods doReturn(...).when(...) is equivalent to when(...).thenReturn(...) . So, my question is what is the poi...
Retrieving the last record in each group - MySQL
...l popular SQL implementations. With this standard syntax, we can write greatest-n-per-group queries:
WITH ranked_messages AS (
SELECT m.*, ROW_NUMBER() OVER (PARTITION BY name ORDER BY id DESC) AS rn
FROM messages AS m
)
SELECT * FROM ranked_messages WHERE rn = 1;
Below is the original answer...
How to join two sets in one line without using “|”
...
@Alvaro @nitely according to a simple test: a = set((1, 2, 3,)); b = set((1, 3, 4,)); id_a = id(a); a |= b; assert id_a == id(a), @jorgenkg is right - variable a is modified inline. Am I missing something?
– johndodo
Jan 7 '...
Where does Oracle SQL Developer store connections?
...can't get connected to my Oracle Database 11g Express Edition. I created a test database in this edition, and I can connect to the database fine using Oracle SQL Developer, create tables, views etc. However, I'm having a hard time getting connected via my application. Where is the connection informa...
Best approach to converting Boolean object to string in java
...Object obj) {
return (obj == null) ? "null" : obj.toString();
}
Just test this code:
Boolean b = null;
System.out.println(String.valueOf(b)); // Prints null
System.out.println(Boolean.toString(b)); // Throws NPE
For primitive boolean, there is no difference.
...
Windows 7, 64 bit, DLL problems
...sual Studio environment.
Going to dare to inject a new link here: The latest supported Visual C++ downloads. Stein Åsmul, 29.11.2018.
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Determining if a variable is within range?
...ray. (1..10000000000000000) === 5000000000000000 is just doing a "between" test under the hood
– John La Rooy
Jan 17 '16 at 23:29
1
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How do I set the size of Emacs' window?
...ws too, storing the resources as key/value pairs in the registry. I never tested that. It might be great, it might be much more of an inconvenience compared to simply editing a file.
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impro...
Purge Kafka Topic
...he topic:
bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic test
then re-create it:
bin/kafka-topics.sh --create --zookeeper localhost:2181 \
--replication-factor 1 --partitions 1 --topic test
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