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Why is SELECT * considered harmful?
...tables, both of which contain a column called "ID". How would a consumer know which was which? SELECT * can also confuse views (at least in some versions SQL Server) when underlying table structures change -- the view is not rebuilt, and the data which comes back can be nonsense. And the worst pa...
Returning JSON from PHP to JavaScript?
...g together JSON by hand, under the assumption that was their only choice. Knowing it wasn't their only choice was a suitable solution. There is no obligation that the end result of that JSON will be emitted as HTTP response. The "add a header" information, while useful for one situation, is not goin...
Why this line xmlns:android=“http://schemas.android.com/apk/res/android” must be the first in the la
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Simple and clear. I don't know about other answers but your answer works like magnet to my confusion and my concept is clear now.
– Stack Overflow
Jun 21 '19 at 17:18
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What is the difference between \r and \n?
... to start printing on the next line.
Obviously that's somewhat irrelevant now, although depending on the console you may still be able to use \r to move to the start of the line and overwrite the existing text.
More importantly, Unix tends to use \n as a line separator; Windows tends to use \r\n a...
Run java jar file on a server as background process
... Short answer: it depends on the server. Long answer: as far as I know, there is no safe way to shut down a process without the process supporting such graceful shut downs. For example, if it's a web server being terminated by an external signal, there is always a possibility that some reque...
Adding an identity to an existing column
...archar(10)
);
ALTER TABLE Test SWITCH TO Test2;
-- drop the original (now empty) table
DROP TABLE Test;
-- rename new table to old table's name
EXEC sp_rename 'Test2','Test';
-- update the identity seed
DBCC CHECKIDENT('Test');
-- see same records
SELECT * FROM Test;
This is obviou...
how to convert milliseconds to date format in android?
... as java.util.Date, java.util.Calendar, and java.text.SimpleDateFormat are now legacy, supplanted by the java.time classes. Much of the java.time functionality is back-ported to Java 6 & Java 7 in the ThreeTen-Backport project. Further adapted for earlier Android in the ThreeTenABP project. See ...
Why is using a wild card with a Java import statement bad?
...IDE (since your argument is that I shouldn't have to use one), how will I know which package Foo came from? Sure, using an IDE, the IDE will tell me, but your entire argument is that I should be able to read the code without one. Doing explicit imports help document the code (great reason to avoid w...
string c_str() vs. data()
...In C++11 onwards, both functions are required to be the same. i.e. data is now required to be null-terminated. According to cppreference: "The returned array is null-terminated, that is, data() and c_str() perform the same function."
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What does git push -u mean?
...or you, linking your repo to a central one. That way, in the future, Git "knows" where you want to push to and where you want to pull from, so you can use git pull or git push without arguments. A little bit down, this article explains and demonstrates this concept.
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