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CASCADE DELETE just once
I have a Postgresql database on which I want to do a few cascading deletes. However, the tables aren't set up with the ON DELETE CASCADE rule. Is there any way I can perform a delete and tell Postgresql to cascade it just this once? Something equivalent to
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How do I concatenate or merge arrays in Swift?
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You can concatenate the arrays with +, building a new array
let c = a + b
print(c) // [1.0, 2.0, 3.0, 4.0, 5.0, 6.0]
or append one array to the other with += (or append):
a += b
// Or:
a.append(contentsOf: b) // Swift 3
a.appendContentsOf(b) // Swift 2
a...
Check if all values of array are equal
...) method tests whether all elements in the array pass the test implemented by the provided function.
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Java内存泄露原因详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的生命周期和应用程序一致，他们所引用的所有的对象Object也不能被释放，因为他们也将一直被Vector等引用着。
例:
Static Vector v = new Vector(10);
for (int i = 1; i<100; i++)
{
Object o = new Object();
v.add(o);
o = null;
}
在这个...
How do I make text bold in HTML?
I'm trying to make some text bold using HTML, but I'm struggling to get it to work.
10 Answers
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Convert absolute path into relative path given a current directory using Bash
...elative-to="$file1" "$file2"
For example:
$ realpath --relative-to=/usr/bin/nmap /tmp/testing
../../../tmp/testing
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Multiple inheritance/prototypes in JavaScript
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Multiple inheritance can be achieved in ECMAScript 6 by using Proxy objects.
Implementation
function getDesc (obj, prop) {
var desc = Object.getOwnPropertyDescriptor(obj, prop);
return desc || (obj=Object.getPrototypeOf(obj) ? getDesc(obj, prop...
map function for objects (instead of arrays)
I have an object:
38 Answers
38
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How to convert list of key-value tuples into dictionary?
...ind that the first element of your list is not a two-tuple, e.g. ('A', 1), but rather a 1916-length iterable.
Once you actually have a list in the form you stated in your original question (myList = [('A',1),('B',2),...]), all you need to do is dict(myList).
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Fastest hash for non-cryptographic uses?
I'm essentially preparing phrases to be put into the database, they may be malformed so I want to store a short hash of them instead (I will be simply comparing if they exist or not, so hash is ideal).
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