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What MySQL data type should be used for Latitude/Longitude with 8 decimal places?
...ith distance/radius you will divide storage coordinates to 10000000. I was test it with 300K rows, query response time is good. ( 2 x 2.67GHz CPU, 2 GB RAM, MySQL 5.5.49 )
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Building a complete online payment gateway like Paypal [closed]
...format for authorization requests and end of day settlement files
Set up a test merchant account and develop auth/settlement software and go through the accreditation process. Most acquirers help you through this process for free, but when you want to register as an accredited PSP some will request ...
In Java, how do I convert a byte array to a string of hex digits while keeping leading zeros? [dupli
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You can use the one below. I tested this with leading zero bytes and with initial negative bytes as well
public static String toHex(byte[] bytes) {
BigInteger bi = new BigInteger(1, bytes);
return String.format("%0" + (bytes.length << 1) +...
Useful GCC flags for C
...e mine:
-Wextra, -Wall: essential.
-Wfloat-equal: useful because usually testing floating-point numbers for equality is bad.
-Wundef: warn if an uninitialized identifier is evaluated in an #if directive.
-Wshadow: warn whenever a local variable shadows another local variable, parameter or global v...
RSA Public Key format
...651D3E83FA095DA630BD6D93E97B0C822A5EB4212D428300278CE6BA0CC7490B854581F0FFB4BA3D4236534DE09459942EF115FAA231B15153D67837A63
265:d=1 hl=2 l= 3 prim: INTEGER :010001
To decode the SSH key format, you need to use the data format specification in RFC 4251 too, in conjunction with RFC 42...
Are the decimal places in a CSS width respected?
...in different browsers, there's an excellent article on ElastiCSS.
edit: I tested @Skilldrick's demo in some browsers for the sake of curiosity. When using fractional pixel values (not percentages, they work as suggested in the article I linked) IE9p7 and FF4b7 seem to round to the nearest pixel, wh...
Which characters need to be escaped when using Bash?
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@dalelane: Can't test here. Please edit when you have a version that works on both.
– Jo So
Jun 22 '17 at 14:34
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Git: Recover deleted (remote) branch
... :refs/remotes/origin/contact_page :refs/remotes/origin/new_pictures ….
Test Push
Try git push --dry-run to see what it git push would do without having it make any changes on the remote repo. If you do not like what it says it is going to do, recover from your backup (tar/zip) and try the other...
How do I copy the contents of one stream to another?
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Note that this is not the fastest way to do it. In the provided code snippet, you have to wait for the Write to complete before a new block is read. When doing the Read and Write asynchronously this waiting will disappear. In some situation this will mak...
How to use Namespaces in Swift?
...ork).
My experience is that Swift therefore is not namespaced in the slightest. In turning one of my apps from Objective-C to Swift, I created an embedded framework because it was so easy and cool to do. Importing the framework, however, imports all the Swift stuff in the framework - so presto, onc...