php - how a website user interacts with a database? -


i'm new this, , can't seem find right search on google answer i'm looking for. have front end user use create new transaction. there drop down menu tied "categories" table has 1:m relationship "transaction" (see image). question is, if user submits form save new transaction, don't know id categories table, they'll doing selecting 1 drop down that's pulling categories table. know how @ point take input drop down , store field in transaction table. i'm trying understand how use relationships, in limited understanding of how keys work, seems unless knew id number was, relationship no good. if you're doing taking submission drop down , storing in transaction table, you've still got category name stored in 2 different tables, what's point? i'm missing step in here somewhere , i'm hoping can make sense out of this.

enter image description here

the user wouldn't know category id. (though if wanted to. it's in markup.) more importantly, code know category id. when creating drop down list (the select element), code populating both id , name. id used value, name used display text.

the resulting markup might this:

<select name="category">     <option value="1">first category</option>     <option value="2">second category</option>     <option value="3">third category</option> </select>

and on.

when user selects one, they're choosing based on text. actual form post value of selected option server. if user selects second category in server-side code $_post["category"] contain value 2, id need insert transaction record.


Comments

Post a Comment

Popular posts from this blog

java.util.scanner - How to read and add only numbers to array from a text file -

i'm learning java , have question regarding reading file want read numbers file contains strings well. here example of file: 66.56 "3 java 3-43 5-42 2.1 1 and here coding: public class test { public static void main (string [] args){ if (0 < args.length) { file x = new file(args[0]); try{ scanner in = new scanner( new fileinputstream(x)); arraylist<double> test = new arraylist<>(); while(in.hasnext()){ if(in.hasnextdouble()){ double f=in.nextdouble(); test.add(f);} else {in.next();} } catch(ioexception e) { system.err.println("exception during reading: " + e); } } my problem add 66.56,2.1 , 1 doesn't add 3 after "3 or ignores 3-43 , 5-42 can tell me how skip strings , add doubles here? thanks all said 3 ie; "3, 3-43 , 4-42 strings either u read string , split , check number @ " , - or put in space between characters , integers. jvm after compilation tre...
Read more

rewrite - Trouble with Wordpress multiple custom querystrings -

i'm working on adding multiple querystring , doesn't seem work. i've found codes seems work others might i'm missing something. i want like: http://mydomain.com/board/?getyear=2013&getsometext2=sometext to http://mydomain.com/board/2013/sometext/ i added code below functions.php file. doesn't seem work should though. this works. echoing querystring gets both variable without problem. http://mydomain.com/board/2013/sometext/ but doesn't. tested querystring vis isset() seems nothing being set/get http://mydomain.com/board/2013/ function add_query_vars($vars) { $vars[] = "getyear"; $vars[] = "getsometext2"; return $vars; } add_filter('query_vars', 'add_query_vars'); function add_rewrite_rules($arules) { $anewrules = array('board/([^/]+)/([^/]+)/?$' => 'index.php?pagename=board&getyear=$matches[1]&getsometext2=$matches[2]'); $arules = $a...
Read more