Comments on: Storing on/off switches through binary representation http://visual77.com/blog/2010/01/storing-onoff-switches-through-binary-representation/ Ramblings from Steve Phillips Tue, 13 Sep 2011 20:36:31 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: DiscDev http://visual77.com/blog/2010/01/storing-onoff-switches-through-binary-representation/comment-page-1/#comment-4463 DiscDev Wed, 05 Jan 2011 22:41:59 +0000 http://www.visual77.com/blog/?p=502#comment-4463 <strong>Using binary numbers for permissions...</strong> I am building a permissions system on the Kohana framework(PHP) using binary numbers and bitwise operators. Below are the 5 binary flags I will be using for permissions: binary flag(permission level) = permission = binary number 1 = view = 00001 2 = ed... Using binary numbers for permissions…

I am building a permissions system on the Kohana framework(PHP) using binary numbers and bitwise operators. Below are the 5 binary flags I will be using for permissions: binary flag(permission level) = permission = binary number 1 = view = 00001 2 = ed…

]]> By: Tinus http://visual77.com/blog/2010/01/storing-onoff-switches-through-binary-representation/comment-page-1/#comment-2387 Tinus Mon, 14 Jun 2010 16:05:49 +0000 http://www.visual77.com/blog/?p=502#comment-2387 Ah, right. Makes sense. Should have thought of that. Either way, nice article, keep it up! Ah, right. Makes sense. Should have thought of that. Either way, nice article, keep it up!

]]> By: visual77 http://visual77.com/blog/2010/01/storing-onoff-switches-through-binary-representation/comment-page-1/#comment-2386 visual77 Mon, 14 Jun 2010 15:39:43 +0000 http://www.visual77.com/blog/?p=502#comment-2386 Good point, and this is a concept I should elaborate upon in this article. MySQL has bitwise operators just as PHP does. To get all records with a particular light set, you would structure the SQL query like this: "SELECT * FROM `light_walkthroughs` WHERE `light` & 256 > 0" 256 is the reception listing, as can be inferred through the earlier table listing each of the areas. "`light` & 256 > 0" is a bitwise operation that will find all entries where the 256 flag (2^8) are enabled. Good point, and this is a concept I should elaborate upon in this article. MySQL has bitwise operators just as PHP does. To get all records with a particular light set, you would structure the SQL query like this:

“SELECT * FROM `light_walkthroughs` WHERE `light` & 256 > 0″

256 is the reception listing, as can be inferred through the earlier table listing each of the areas. “`light` & 256 > 0″ is a bitwise operation that will find all entries where the 256 flag (2^8) are enabled.

]]> By: Tinus http://visual77.com/blog/2010/01/storing-onoff-switches-through-binary-representation/comment-page-1/#comment-2383 Tinus Mon, 14 Jun 2010 13:48:17 +0000 http://www.visual77.com/blog/?p=502#comment-2383 No offence, but doesn't this defeat the purpose of having a table for the lights in the first place? For example, how would you query the table to return all records where the "Reception" lights are set? No offence, but doesn’t this defeat the purpose of having a table for the lights in the first place? For example, how would you query the table to return all records where the “Reception” lights are set?

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