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Swapping column values in MySQL
...wapping string values)
mysql> select * from swapper;
+------+------+
| foo | bar |
+------+------+
| 6 | 1 |
| 5 | 2 |
| 4 | 3 |
+------+------+
3 rows in set (0.00 sec)
mysql> update swapper set
-> foo = concat(foo, "###", bar),
-> bar = replace(foo, co...
Lightweight Java Object cache API [closed]
...to implement a simple cache without third party jars:
Map <String, Foo> cache = new LinkedHashMap<String, Foo>(MAX_ENTRIES + 1, .75F, true) {
public boolean removeEldestEntry(Map.Entry<String, Foo> eldest) {
return size() > MAX_ENTRIES;
}
};...
How to access the first property of a Javascript object?
...ill be iterated in a predictable/useful order though. I.e., you may intend foo1 but get foo3. If the properties are numbered as in the example, you could do a string compare to ascertain the identifier ending in '1'. Then again, if ordinality is the main concern of the collection, you should proba...
Use grep --exclude/--include syntax to not grep through certain files
I'm looking for the string foo= in text files in a directory tree. It's on a common Linux machine, I have bash shell:
22 ...
JavaScript property access: dot notation vs. brackets?
...n allows the use of characters that can't be used with dot notation:
var foo = myForm.foo[]; // incorrect syntax
var foo = myForm["foo[]"]; // correct syntax
including non-ASCII (UTF-8) characters, as in myForm["ダ"] (more examples).
Secondly, square bracket notation is useful when dealing wi...
Git: How to diff two different files in different branches?
...
git diff branch1:full/path/to/foo.txt branch2:full/path/to/foo-another.txt
You can also use relative paths:
git diff branch1:./relative/path/to/foo.txt branch2:./relative/path/to/foo-another.txt
...
How do I count a JavaScript object's attributes? [duplicate]
... the ones you defined from those you got "for free."
Here's one way:
var foo = {"key1": "value1", "key2": "value2", "key3": "value3"};
Object.prototype.foobie = 'bletch'; // add property to foo that won't be counted
var count = 0;
for (var k in foo) {
if (foo.hasOwnProperty(k)) {
++cou...
Java associative-array
...our information and store instances of them in an ArrayList.
public class Foo{
public String name, fname;
public Foo(String name, String fname){
this.name = name;
this.fname = fname;
}
}
And then...
List<Foo> foos = new ArrayList<Foo>();
foos.add(new Foo(...
Calling a function of a module by using its name (a string)
...'s name in a Python program. For example, let's say that I have a module foo , and I have a string whose content is "bar" . What is the best way to call foo.bar() ?
...
Easiest way to rename a model using Django/South?
...aightforward. Run the command:
./manage.py schemamigration yourapp rename_foo_to_bar --empty
(Update 2: try --auto instead of --empty to avoid the warning below. Thanks to @KFB for the tip.)
If you're using an older version of south, you'll need startmigration instead of schemamigration.
Then ...