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Postgres: INSERT if does not exist already
...sert on this blog (in the updated area at the bottom) including some links if you want to read more about the details.
– Skyguard
Apr 1 '17 at 16:03
22
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How to convert milliseconds into human readable form?
...in the above, it is assumed that / represents truncating integer division. If you use this code in a language where / represents floating point division, you will need to manually truncate the results of the division as needed.
...
Compare floats in php
...
If you do it like this they should be the same. But note that a characteristic of floating-point values is that calculations which seem to result in the same value do not need to actually be identical. So if $a is a literal ....
How to get the caret column (not pixels) position in a textarea, in characters, from the start?
..., so you will have to do something like this:
function getCaret(node) {
if (node.selectionStart) {
return node.selectionStart;
} else if (!document.selection) {
return 0;
}
var c = "\001",
sel = document.selection.createRange(),
dul = sel.duplicate(),
len = 0;
...
Generating all permutations of a given string
...oid permutation(String prefix, String str) {
int n = str.length();
if (n == 0) System.out.println(prefix);
else {
for (int i = 0; i < n; i++)
permutation(prefix + str.charAt(i), str.substring(0, i) + str.substring(i+1, n));
}
}
(via Introduction to Programmin...
Optimal settings for exporting SVGs for the web from Illustrator?
...ll of the SVG 1.2 Tiny content that Illustrator produces too.
Fonts note: if you don't have any text in your image this setting doesn't matter.
Adobe CEF: never use this option of you intend to display it in browsers. It's Adobe's way of embedding fonts in SVG files, as far as I know this is only...
What happens if I define a 0-size array in C/C++?
Just curious, what actually happens if I define a zero-length array int array[0]; in code? GCC doesn't complain at all.
7...
Converting file size in bytes to human-readable string
...FileSize(bytes, si=false, dp=1) {
const thresh = si ? 1000 : 1024;
if (Math.abs(bytes) < thresh) {
return bytes + ' B';
}
const units = si
? ['kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB']
: ['KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB'];
let u = -1;...
Contains case insensitive
...ng in a lower case string. Then, use .indexOf() using ral instead of Ral.
if (referrer.toLowerCase().indexOf("ral") === -1) {
The same can also be achieved using a Regular Expression (especially useful when you want to test against dynamic patterns):
if (!/Ral/i.test(referrer)) {
// ^i = ...
C++使用OLE/COM高速读写EXCEL的源码 - C/C++ - 清泛网 - 专注C/C++及内核技术
...Excel 文件，有时候打开EXCEL文件就要
void CloseExcelFile(BOOL if_save = FALSE);
//另存为一个EXCEL文件
void SaveasXSLFile(const CString &xls_file);
///取得打开文件的名称
CString GetOpenFileName();
///取得打开sheet的名称
CString GetLoadSheetName();
/...