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Cannot change column used in a foreign key constraint
...eign key field and reference must be equal.
This means your foreign key disallows changing the type of your field.
One solution would be this:
LOCK TABLES
favorite_food WRITE,
person WRITE;
ALTER TABLE favorite_food
DROP FOREIGN KEY fk_fav_food_person_id,
MODIFY person_id SMALLIN...
How do I 'overwrite', rather than 'merge', a branch on another branch in Git?
...(git commit-tree -m "Throw away branch 'A'" -p A -p B B^{tree})
This basically acts like the (non-existent) merge -s theirs strategy.
You can find the resulting history in the plumbing branch of the demo repository
Not very readable and not as easy to remember compared to the -s ours switch, but it...
try/catch versus throws Exception
...
Yes, there's a huge difference - the latter swallows the exception (showing it, admittedly), whereas the first one will let it propagate. (I'm assuming that showException doesn't rethrow it.)
So if you call the first method and "do something" fails, then the caller will...
What are the First and Second Level caches in Hibernate?
...ed, but there is no option to get rid of it. but you should think about it all the time..
– ses
Mar 28 '13 at 17:39
...
Extending the User model with custom fields in Django
...ing the fields for additional information. This one-to-one model is often called a profile model, as it might store non-auth related information about a site user.
That said, extending django.contrib.auth.models.User and supplanting it also works...
Substituting a custom User model
Some kinds of p...
How to change the port of Tomcat from 8080 to 80?
...
1) Go to conf folder in tomcat installation directory
e.g. C:\Tomcat 6.0\conf\
2) Edit following tag in server.xml file
<Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"/>
3) Change the port=8080 value to por...
How do I efficiently iterate over each entry in a Java Map?
...erret The only reason you might want to use an iterator is if you need to call its remove method. If that is the case, this other answer shows you how to do it. Otherwise, the enhanced loop as shown in the answer above is the way to go.
– assylias
Oct 8 '12 at ...
Bash Script : what does #!/bin/bash mean? [duplicate]
...
That is called a shebang, it tells the shell what program to interpret the script with, when executed.
In your example, the script is to be interpreted and run by the bash shell.
Some other example shebangs are:
(From Wikipedia)
#...
do N times (declarative syntax)
...based on Array.forEach, without any library, just native vanilla.
To basically call something() 3 times, use:
[1,2,3].forEach(function(i) {
something();
});
considering the following function:
function something(){ console.log('something') }
The outpout will be
something
something
somethi...
Deleting an element from an array in PHP
...ndex the keys you can use \array_values() after unset() which will convert all keys to numerical enumerated keys starting from 0.
Code
<?php
$array = [0 => "a", 1 => "b", 2 => "c"];
unset($array[1]);
//↑ Key which you want to delete
?>
Output
[
[0] =&g...