Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Trying to keep two arrays synchronized is just asking for trouble. It can be done, of course, but whenever you modify one array, you have to remember to make a corresponding change to the other. Do yourself a favor and avoid that entire class of bugs by rethinking the way you're storing data.</p> <p>In this case, you've got a {person, boolean} pair. One option is to store each pair as a dictionary, and then keep an array of those dictionaries. This would be a particularly good plan if you might expand the number of pieces of data beyond the two that you have. Another option would be to just use a dictionary where keys are person names and the values are your yes/no values. This makes the answer to your question very simple:</p> <pre><code>NSString *yesOrNo = [personDictionary objectForKey:personName]; </code></pre> <p>Getting back to your original question, where you still have the two arrays, the <em>easiest</em> thing to do is to iterate over the person array until you find the person you're looking for, get the index of that name, and then look up the corresponding value in the yes/no array:</p> <pre><code>for (person in peopleArray) { if ([person isEqualToString:thePersonYoureLookingFor]) { yesNoValue = [yesNoArray objectAtIndex:[peopleArray indexOfObject:person]; break; } } </code></pre> <p>That's fine if the number of people in the list isn't too large. If the list could be large, then you'll want to keep the person array sorted so that you can do a binary search. The trouble there, though, is that you're yes/no array is separate, so sorting the personArray while keeping the yes/no array in the right order becomes complicated.</p>
    singulars
    1. This table or related slice is empty.
    1. POGet index of object in array to look up corresponding object in other array
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USCaleb
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. CO+1: Depending on the requirements, a dictionary/custom class and a sorted array + binary search is a good solution as well.
      singulars
      1. PO
      1. This table or related slice is empty.
    2. COThat is what I originally wanted to do, but I couldn't figure out how to get all of that information from my server. What I am doing right now is requesting the names list and having the server imploding the names, then exploding them into an array in my application. Then doing the same thing for the yes/no array. What would be a better way of doing that?
      singulars
      1. PO
      1. USPreston
    3. CO@Preston, even if you start out with two arrays, it's easy to create a dictionary from two arrays: `peopleDictionary = [NSDictionary dictionaryWithObjects:yesNoArray andKeys:peopleArray];`. It's not much more difficult if you want an array of dictionaries -- just create a loop that constructs a dictionary from corresponding elements of each array and then adds that dictionary to the final array. The custom class that Bavarious alluded to is also a good option, particularly if there's any logic related to a person.
      singulars
      1. PO
      1. USCaleb
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload